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Lu Y, Han L, Wang X, Liu X, Jia X, Lan K, Gao S, Feng Z, Yu L, Yang Q, Cui N, Wei YB, Liu JJ. Association between blood mitochondrial DNA copy number and mental disorders: A bidirectional two-sample mendelian randomization study. J Affect Disord 2024; 366:370-378. [PMID: 39197553 DOI: 10.1016/j.jad.2024.08.162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/24/2024] [Revised: 08/22/2024] [Accepted: 08/23/2024] [Indexed: 09/01/2024]
Abstract
BACKGROUND Mitochondria is essential for cellular energy production, oxidative stress, and apoptosis. Mitochondrial DNA (mtDNA) encodes essential proteins for mitochondrial function. Although several studies have explored the association between changes in mtDNA copy number (mtDNA-CN) and risk of mental disorders, the results remain debated. This study used a bidirectional two-sample Mendelian randomization (MR) analysis to examine the genetic causality between mtDNA-CN and mental disorders. METHODS Genome-wide association study (GWAS) data for mtDNA-CN were sourced from UK biobank, involving 383,476 European cases. GWAS data for seven mental disorders-attention deficit/hyperactivity disorder, autism spectrum disorder (ASD), schizophrenia, bipolar disorder, major depressive disorder, anxiety, and obsessive-compulsive disorder-were primarily obtained from the Psychiatric Genomics Consortium. Causal associations were assessed using inverse variance weighting, with sensitivity analyses via the weighted median and MR-Egger methods. Reverse MR considered the seven mental disorders as exposures. All analyses were replicated with additional mtDNA-CN GWAS data from 465,809 individuals in the Heart and Ageing Research in Genomic Epidemiology consortium and the UK Biobank. RESULTS Forward MR observed a 27 % decrease in the risk of ASD per standard deviation increase in genetically determined blood mtDNA-CN (OR = 0.73, 95%CI: 0.58-0.92, p = 0.002), with no causal effects on other disorders. Additionally, reverse MR did not indicate a causal association between any of the mental disorders and mtDNA-CN. Validation analyses corroborated these findings, indicating their robustness. CONCLUSIONS Our study supports the potential causal association between mtDNA-CN and the risk of ASD, suggesting that mtDNA-CN could serve as a promising biomarker for early screening of ASD.
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Affiliation(s)
- Yan'e Lu
- School of Nursing, Peking University, Beijing 100191, China
| | - Lei Han
- Beijing Key Laboratory of Drug Dependence Research, National Institute on Drug Dependence, Peking University, Beijing 100191, China
| | - Xingxing Wang
- School of Nursing, Peking University, Beijing 100191, China
| | - Xiaotong Liu
- School of Nursing, Peking University, Beijing 100191, China
| | - Xinlei Jia
- School of Nursing, Peking University, Beijing 100191, China
| | - Kunyi Lan
- School of Nursing, Peking University, Beijing 100191, China
| | - Shumin Gao
- Beijing Key Laboratory of Drug Dependence Research, National Institute on Drug Dependence, Peking University, Beijing 100191, China
| | - Zhendong Feng
- Beijing Key Laboratory of Drug Dependence Research, National Institute on Drug Dependence, Peking University, Beijing 100191, China
| | - Lulu Yu
- Mental Health Center, the First Hospital of Hebei Medical University, Hebei Technical Innovation Center for Mental Health Assessment and Intervention, Shijiazhuang, Hebei Province 050031, China
| | - Qian Yang
- MRC Integrative Epidemiology Unit, University of Bristol, Bristol, UK; Department of Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
| | - Naixue Cui
- School of Nursing and Rehabilitation, Shandong University, Shandong Province 250012, China
| | - Ya Bin Wei
- Beijing Key Laboratory of Drug Dependence Research, National Institute on Drug Dependence, Peking University, Beijing 100191, China.
| | - Jia Jia Liu
- School of Nursing, Peking University, Beijing 100191, China.
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Peng M, Yue P, Zhang Y, Li H, Hua Y, Li Y, Zheng H, Liu F. A nomogram prediction of coronary artery dilation in Kawasaki diseases based on mtDNA copy number. Front Immunol 2024; 15:1448558. [PMID: 39206185 PMCID: PMC11349549 DOI: 10.3389/fimmu.2024.1448558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2024] [Accepted: 07/25/2024] [Indexed: 09/04/2024] Open
Abstract
Objective The level of mitochondrial DNA copy number (mtDNA-CN) in peripheral blood cells had been identified to be involved in several immune and cardiovascular diseases. Thus, the aim of this study is to evaluate the levels of mtDNA-CN in Kawasaki disease (KD) and to construct a nomogram prediction for coronary artery lesions in children with KD. Methods One hundred and forty-four children with KD diagnosed from March 2020 to March 2022 were involved in the study. The clinical features and laboratory test parameters of these children were assessed between the KD and normal groups. Univariable and multivariable analyses were performed sequentially to identify the essential risk factors. Subsequently, a nomogram prediction was constructed. Results A total of 274 children were included in the analysis. Of these, 144 (52.6%) represented the KD group. Peripheral blood DNA mtDNA qPCR showed that the -log value of mtDNA-CN in the KD group (6.67 ± 0.34) was significantly higher than that in the healthy group (6.40 ± 0.18) (P<0.001). The area under the ROC curve for mtDNA-CN in distinguishing KD was 0.757. MtDNA-CN (OR = 13.203, P = 0.009, 95% CI 1.888-92.305), RBC (OR = 5.135, P = 0.014, 95% CI 1.394-18.919), and PA (OR = 0.959, P = 0.014, 95% CI 0.927-0.991) were identified as independent risk factors for coronary artery dilation in children with KD. Finally, the nomogram predictive was established based on the results of multivariable analysis, demonstrating the satisfied prediction and calibration values. Conclusion The results of this study revealed that mtDNA-CN could be used as a biomarker in predicting the development of KD. Furthermore, the higher the mtDNA-CN was significantly associated with coronary artery dilation in KD.
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Affiliation(s)
- Mou Peng
- Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education (MOE), Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Peng Yue
- Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education (MOE), Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Yue Zhang
- Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education (MOE), Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Hong Li
- Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education (MOE), Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, China
- Department of Nursing, West China Second University Hospital, Sichuan University, Chengdu, China
| | - Yimin Hua
- Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education (MOE), Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Yifei Li
- Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education (MOE), Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Hong Zheng
- Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education (MOE), Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, China
- Department of Nursing, West China Second University Hospital, Sichuan University, Chengdu, China
| | - Fangfei Liu
- Key Laboratory of Birth Defects and Related Diseases of Women and Children of Ministry of Education (MOE), Department of Pediatrics, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, China
- Department of Nursing, West China Second University Hospital, Sichuan University, Chengdu, China
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3
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Papila B, Karimova A, Onaran I. Altered lactate/pyruvate ratio may be responsible for aging-associated intestinal barrier dysfunction in male rats. Biogerontology 2024; 25:679-689. [PMID: 38619668 PMCID: PMC11217102 DOI: 10.1007/s10522-024-10102-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Accepted: 02/29/2024] [Indexed: 04/16/2024]
Abstract
Some evidence points to a link between aging-related increased intestinal permeability and mitochondrial dysfunction in in-vivo models. Several studies have also demonstrated age-related accumulation of the of specific deletion 4834-bp of "common" mitochondrial DNA (mtDNA) in various rat tissues and suggest that this deletion may disrupt mitochondrial metabolism. The present study aimed to investigate possible associations among the mitochondrial DNA (mtDNA) common deletion, mitochondrial function, intestinal permeability, and aging in rats. The study was performed on the intestinal tissue from (24 months) and young (4 months) rats. mtDNA4834 deletion, mtDNA copy number, mitochondrial membrane potential, and ATP, lactate and pyruvate levels were analyzed in tissue samples. Zonulin and intestinal fatty acid-binding protein (I-FABP) levels were also evaluated in serum. Serum zonulin and I-FABP levels were significantly higher in 24-month-old rats than 4-month-old rats (p = 0.04, p = 0.026, respectively). There is not significant difference in mtDNA4834 copy levels was observed between the old and young intestinal tissues (p > 0.05). The intestinal mitochondrial DNA copy number was similar between the two age groups (p > 0.05). No significant difference was observed in ATP levels in the intestinal tissue lysates between old and young rats (p > 0.05). ATP levels in isolated mitochondria from both groups were also similar. Analysis of MMP using JC-10 in intestinal tissue mitochondria showed that mitochondrial membrane potentials (red/green ratios) were similar between the two age groups (p > 0.05). Pyruvate tended to be higher in the 24-month-old rat group and the L/P ratio was found to be approximately threefold lower in the intestinal tissue of the older rats compared to the younger rats (p < 0.002). The tissue lactate/pyruvate ratio (L/P) was three times lower in old rats than in young rats. Additionally, there were significant negative correlations between intestinal permeability parameters and L/P ratios. The intestinal tissues of aged rats are not prone to accumulate mtDNA common deletion, we suggest that this mutation does not explain the age-related increase in intestinal permeability. It seems to be more likely that altered glycolytic capacity could be a link to increased intestinal permeability with age. This observation strengthens assertions that the balance between glycolysis and mitochondrial metabolism may play a critical role in intestinal barrier functions.
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Affiliation(s)
- Berrin Papila
- Department of General Surgery, Cerrahpasa Faculty of Medicine, Istanbul University-Cerrahpasa, Cerrahpasa, Fatih, 34098, Istanbul, Turkey.
| | - Ayla Karimova
- Department of Medical Biology and Genetics, Cerrahpasa Faculty of Medicine, Istanbul University-Cerrahpasa, Istanbul, Turkey
| | - Ilhan Onaran
- Department of Medical Biology and Genetics, Cerrahpasa Faculty of Medicine, Istanbul University-Cerrahpasa, Istanbul, Turkey
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Vahedi Raad M, Firouzabadi AM, Tofighi Niaki M, Henkel R, Fesahat F. The impact of mitochondrial impairments on sperm function and male fertility: a systematic review. Reprod Biol Endocrinol 2024; 22:83. [PMID: 39020374 PMCID: PMC11253428 DOI: 10.1186/s12958-024-01252-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2024] [Accepted: 06/27/2024] [Indexed: 07/19/2024] Open
Abstract
BACKGROUND Besides adenine triphosphate (ATP) production for sustaining motility, the mitochondria of sperm also host other critical cellular functions during germ cell development and fertilization including calcium homeostasis, generation of reactive oxygen species (ROS), apoptosis, and in some cases steroid hormone biosynthesis. Normal mitochondrial membrane potential with optimal mitochondrial performance is essential for sperm motility, capacitation, acrosome reaction, and DNA integrity. RESULTS Defects in the sperm mitochondrial function can severely harm the fertility potential of males. The role of sperm mitochondria in fertilization and its final fate after fertilization is still controversial. Here, we review the current knowledge on human sperm mitochondria characteristics and their physiological and pathological conditions, paying special attention to improvements in assistant reproductive technology and available treatments to ameliorate male infertility. CONCLUSION Although mitochondrial variants associated with male infertility have potential clinical use, research is limited. Further understanding is needed to determine how these characteristics lead to adverse pregnancy outcomes and affect male fertility potential.
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Affiliation(s)
- Minoo Vahedi Raad
- Department of Biology & Anatomical Sciences, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Amir Masoud Firouzabadi
- Reproductive Immunology Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
- Department of Physiology, School of Medical Sciences, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
| | - Maryam Tofighi Niaki
- Health Reproductive Research Center, Sari Branch, Islamic Azad University, Sari, Iran
| | - Ralf Henkel
- LogixX Pharma, Theale, Berkshire, UK.
- Department of Metabolism, Digestion and Reproduction, Imperial College London, London, UK.
- Department of Medical Bioscience, University of the Western Cape, Bellville, South Africa.
| | - Farzaneh Fesahat
- Reproductive Immunology Research Center, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
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Ardehjani NA, Agha-Hosseini M, Nashtaei MS, Khodarahmian M, Shabani M, Jabarpour M, Fereidouni F, Rastegar T, Amidi F. Resveratrol ameliorates mitochondrial biogenesis and reproductive outcomes in women with polycystic ovary syndrome undergoing assisted reproduction: a randomized, triple-blind, placebo-controlled clinical trial. J Ovarian Res 2024; 17:143. [PMID: 38987824 PMCID: PMC11234766 DOI: 10.1186/s13048-024-01470-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2024] [Accepted: 07/01/2024] [Indexed: 07/12/2024] Open
Abstract
BACKGROUND This study was designed to examine the effect of resveratrol on mitochondrial biogenesis, oxidative stress (OS), and assisted reproductive technology (ART) outcomes in individuals with polycystic ovary syndrome (PCOS). METHODS Fifty-six patients with PCOS were randomly assigned to receive 800 mg/day of resveratrol or placebo for 60 days. The primary outcome was OS in follicular fluid (FF). The secondary outcome involved assessing gene and protein expression related to mitochondrial biogenesis, mitochondrial DNA (mtDNA) copy number, and adenosine triphosphate (ATP) content in granulosa cells (GCs). ART outcomes were evaluated at the end of the trial. RESULTS Resveratrol significantly reduced the total oxidant status (TOS) and oxidative stress index (OSI) in FF (P = 0.0142 and P = 0.0039, respectively) while increasing the total antioxidant capacity (TAC) (P < 0.0009). Resveratrol consumption also led to significant increases in the expression of critical genes involved in mitochondrial biogenesis, including peroxisome proliferator-activated receptor gamma coactivator (PGC-1α) and mitochondrial transcription factor A (TFAM) (P = 0.0032 and P = 0.0003, respectively). However, the effect on nuclear respiratory factor 1 (Nrf-1) expression was not statistically significant (P = 0.0611). Resveratrol significantly affected sirtuin1 (SIRT1) and PGC-1α protein levels (P < 0.0001 and P = 0.0036, respectively). Resveratrol treatment improved the mtDNA copy number (P < 0.0001) and ATP content in GCs (P = 0.0014). Clinically, the resveratrol group exhibited higher rates of oocyte maturity (P = 0.0012) and high-quality embryos (P = 0.0013) than did the placebo group. There were no significant differences between the groups in terms of chemical or clinical pregnancy rates (P > 0.05). CONCLUSIONS These findings indicate that resveratrol may be a promising therapeutic agent for patients with PCOS undergoing assisted reproduction. TRIAL REGISTRATION NUMBER http://www.irct.ir ; IRCT20221106056417N1; 2023 February 09.
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Affiliation(s)
- Negar Ajabi Ardehjani
- Department of Anatomy, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Marzieh Agha-Hosseini
- Department of Infertility, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Maryam Shabani Nashtaei
- Department of Anatomy, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
- Department of Infertility, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Mahshad Khodarahmian
- Department of Anatomy, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
- Department of Infertility, Arash Women's Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Maryam Shabani
- Department of Clinical Biochemistry, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Masoome Jabarpour
- Department of Anatomy, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
- Department of Infertility, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Farzane Fereidouni
- Department of Anatomy, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Tayebeh Rastegar
- Department of Anatomy, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
| | - Fardin Amidi
- Department of Anatomy, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran.
- Department of Infertility, Yas Hospital, Tehran University of Medical Sciences, Tehran, Iran.
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Khadka P, Young CKJ, Sachidanandam R, Brard L, Young MJ. Our current understanding of the biological impact of endometrial cancer mtDNA genome mutations and their potential use as a biomarker. Front Oncol 2024; 14:1394699. [PMID: 38993645 PMCID: PMC11236604 DOI: 10.3389/fonc.2024.1394699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Accepted: 06/10/2024] [Indexed: 07/13/2024] Open
Abstract
Endometrial cancer (EC) is a devastating and common disease affecting women's health. The NCI Surveillance, Epidemiology, and End Results Program predicted that there would be >66,000 new cases in the United States and >13,000 deaths from EC in 2023, and EC is the sixth most common cancer among women worldwide. Regulation of mitochondrial metabolism plays a role in tumorigenesis. In proliferating cancer cells, mitochondria provide the necessary building blocks for biosynthesis of amino acids, lipids, nucleotides, and glucose. One mechanism causing altered mitochondrial activity is mitochondrial DNA (mtDNA) mutation. The polyploid human mtDNA genome is a circular double-stranded molecule essential to vertebrate life that harbors genes critical for oxidative phosphorylation plus mitochondrial-derived peptide genes. Cancer cells display aerobic glycolysis, known as the Warburg effect, which arises from the needs of fast-dividing cells and is characterized by increased glucose uptake and conversion of glucose to lactate. Solid tumors often contain at least one mtDNA substitution. Furthermore, it is common for cancer cells to harbor mixtures of wild-type and mutant mtDNA genotypes, known as heteroplasmy. Considering the increase in cancer cell energy demand, the presence of functionally relevant carcinogenesis-inducing or environment-adapting mtDNA mutations in cancer seems plausible. We review 279 EC tumor-specific mtDNA single nucleotide variants from 111 individuals from different studies. Many transition mutations indicative of error-prone DNA polymerase γ replication and C to U deamination events were present. We examine the spectrum of mutations and their heteroplasmy and discuss the potential biological impact of recurrent, non-synonymous, insertion, and deletion mutations. Lastly, we explore current EC treatments, exploiting cancer cell mitochondria for therapy and the prospect of using mtDNA variants as an EC biomarker.
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Affiliation(s)
- Pabitra Khadka
- Department of Biomedical Sciences, Division of Biochemistry & Molecular Biology, Southern Illinois University School of Medicine, Carbondale, IL, United States
| | - Carolyn K J Young
- Department of Biomedical Sciences, Division of Biochemistry & Molecular Biology, Southern Illinois University School of Medicine, Carbondale, IL, United States
| | | | - Laurent Brard
- Obstetrics & Gynecology, Southern Illinois University School of Medicine, Springfield, IL, United States
- Simmons Cancer Institute, Springfield, IL, United States
| | - Matthew J Young
- Department of Biomedical Sciences, Division of Biochemistry & Molecular Biology, Southern Illinois University School of Medicine, Carbondale, IL, United States
- Simmons Cancer Institute, Springfield, IL, United States
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Koyuncu H, Kara N, Dabak Ş. Investigation of the possible effects of night shift on telomere length and mtDNA copy number in nurses. NUCLEOSIDES, NUCLEOTIDES & NUCLEIC ACIDS 2024:1-14. [PMID: 38830229 DOI: 10.1080/15257770.2024.2348089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Accepted: 04/22/2024] [Indexed: 06/05/2024]
Abstract
In this study, we aimed to investigate the impacts of altered circadian rhythm on telomere length and mtDNA copy number (mtDNA-CN) in nurses working night shifts. In our study, 52 healthy nurses working in shifts at Ondokuz Mayıs University Hospital and 45 healthy control subjects working during the day were included. qRT-PCR technique was used for the determination of telomere length and mtDNA-CN. It was observed that the shift-work group had poor sleep quality (p = 0.004), feeling tired (p < 0.01) and stressed (p = 0.02) more than control group working during the day. Nurses working in shifts were found to have 1.18 times longer telomeres with respect to the control group working during the day (p = 0.005). When compared among shift workers, poor sleep quality and insufficient sleep duration shortened telomeres (r = 0.32; p = 0.02). There was no statistically significantdisparity regarding mtDNA-CN among the nurses working in shifts and the control group working during the day (p = 0.07). Insufficient sleep was associated with decreased mtDNA-CN when shift-working nurses were compared according to sleep quality (p = 0.006). Furthermore, mtDNA-CN of nurses with poor sleep quality was correlated with lower mtDNA-CN in comparison to nurses with good sleep quality (r = 0.284; p = 0.04). The mtDNA-CN of the nurses was positively associated with the sleep duration the night sleep before the night shift (r = 0.32; p = 0.02). Inadequate sleep duration and quality were observed to cause a reduction in mtDNA-CN of nurses. In conclusion, it has been observed that poor sleep quality and duration are related to shortened telomere length and decreased mtDNA-CN in night shift nurses.
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Affiliation(s)
- Hilal Koyuncu
- Faculty of Medicine, Department of Medical Biology, Ondokuz Mayıs University, Samsun, Turkey
| | - Nurten Kara
- Faculty of Medicine, Department of Medical Biology, Ondokuz Mayıs University, Samsun, Turkey
| | - Şennur Dabak
- Faculty of Medicine, Department of Public Health, Ondokuz Mayıs University, Samsun, Turkey
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8
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Parandavar E, Shafizadeh M, Ahmadian S, Javan M. Long-term demyelination and aging-associated changes in mice corpus callosum; evidence for the role of accelerated aging in remyelination failure in a mouse model of multiple sclerosis. Aging Cell 2024:e14211. [PMID: 38804500 DOI: 10.1111/acel.14211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 05/01/2024] [Accepted: 05/10/2024] [Indexed: 05/29/2024] Open
Abstract
Multiple sclerosis (MS) is a chronic inflammatory and demyelinating disorder affecting the central nervous system. Evidence suggests that age-related neurodegeneration contributes to disability progression during the chronic stages of MS. Aging is characterized by decreased regeneration potential and impaired myelin repair in the brain. It is hypothesized that accelerated cellular aging contributes to the functional decline associated with neurodegenerative diseases. We assessed the impact of aging on myelin content in the corpus callosum (CC) and compared aging with the long-term demyelination (LTD) consequents induced by 12 weeks of feeding with a cuprizone (CPZ) diet. Initially, evaluating myelin content in 2-, 6-, and 18-month-old mice revealed a reduction in myelin content, particularly at 18 months. Myelin thickness was decreased and the g-ratio increased in aged mice. Although a lower myelin content and higher g-ratio were observed in LTD model mice, compared to the normally aged mice, both aging and LTD exhibited relatively similar myelin ultrastructure. Our findings provide evidence that LTD exhibits the hallmarks of aging such as elevated expression of senescence-associated genes, mitochondrial dysfunction, and high level of oxidative stress as observed following normal aging. We also investigated the senescence-associated β-galactosidase activity in O4+ late oligodendrocyte progenitor cells (OPCs). The senescent O4+/β-galactosidase+ cells were elevated in the CPZ diet. Our data showed that the myelin degeneration in CC occurs throughout the lifespan, and LTD induced by CPZ accelerates the aging process which may explain the impairment of myelin repair in patients with progressive MS.
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Affiliation(s)
- Elham Parandavar
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - Mahshid Shafizadeh
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - Shahin Ahmadian
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
| | - Mohammad Javan
- Department of Physiology, School of Medical Sciences, Tarbiat Modares University, Tehran, Iran
- Institute for Brain and Cognition, Tarbiat Modares University, Tehran, Iran
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9
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Sadler DE, Watts PC, Uusi-Heikkilä S. Directional selection, not the direction of selection, affects telomere length and copy number at ribosomal RNA loci. Sci Rep 2024; 14:12162. [PMID: 38802448 PMCID: PMC11130246 DOI: 10.1038/s41598-024-63030-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2024] [Accepted: 05/23/2024] [Indexed: 05/29/2024] Open
Abstract
Many fisheries exert directional selection on traits such as body size and growth rate. Whether directional selection impacts regions of the genome associated with traits related to growth is unknown. To address this issue, we characterised copy number variation in three regions of the genome associated with cell division, (1) telomeric DNA, (2) loci transcribed as ribosomal RNA (rDNA), and (3) mitochondrial DNA (mtDNA), in three selection lines of zebrafish reared at three temperatures (22 °C, 28 °C, and 34 °C). Selection lines differed in (1) the direction of selection (two lines experienced directional selection for large or small body size) and (2) whether they experienced any directional selection itself. Lines that had experienced directional selection were smaller, had lower growth rate, shorter telomeres, and lower rDNA copy number than the line that experiencing no directional selection. Neither telomere length nor rDNA copy number were affected by temperature. In contrast, mtDNA content increased at elevated temperature but did not differ among selection lines. Though directional selection impacts rDNA and telomere length, direction of such selection did not matter, whereas mtDNA acts as a stress marker for temperature. Future work should examine the consequences of these genomic changes in natural fish stocks.
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Affiliation(s)
- Daniel E Sadler
- Department of Biological and Environmental Science, University of Jyväskylä, 40014, Jyväskylä, Finland.
| | - Phillip C Watts
- Department of Biological and Environmental Science, University of Jyväskylä, 40014, Jyväskylä, Finland
| | - Silva Uusi-Heikkilä
- Department of Biological and Environmental Science, University of Jyväskylä, 40014, Jyväskylä, Finland
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Del Bianco D, Gentile R, Sallicandro L, Biagini A, Quellari PT, Gliozheni E, Sabbatini P, Ragonese F, Malvasi A, D’Amato A, Baldini GM, Trojano G, Tinelli A, Fioretti B. Electro-Metabolic Coupling of Cumulus-Oocyte Complex. Int J Mol Sci 2024; 25:5349. [PMID: 38791387 PMCID: PMC11120766 DOI: 10.3390/ijms25105349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2024] [Revised: 05/03/2024] [Accepted: 05/10/2024] [Indexed: 05/26/2024] Open
Abstract
Oocyte-cumulus cell interaction is essential for oocyte maturation and competence. The bidirectional crosstalk network mediated by gap junctions is fundamental for the metabolic cooperation between these cells. As cumulus cells exhibit a more glycolytic phenotype, they can provide metabolic substrates that the oocyte can use to produce ATP via oxidative phosphorylation. The impairment of mitochondrial activity plays a crucial role in ovarian aging and, thus, in fertility, determining the success or failure of assisted reproductive techniques. This review aims to deepen the knowledge about the electro-metabolic coupling of the cumulus-oocyte complex and to hypothesize a putative role of potassium channel modulators in order to improve fertility, promote intracellular Ca2+ influx, and increase the mitochondrial biogenesis and resulting ATP levels in cumulus cells.
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Affiliation(s)
- Diletta Del Bianco
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via dell’Elce di Sotto 8, 06132 Perugia, Italy; (D.D.B.); (R.G.); (L.S.); (A.B.); (P.T.Q.); (E.G.); (P.S.); (F.R.)
| | - Rosaria Gentile
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via dell’Elce di Sotto 8, 06132 Perugia, Italy; (D.D.B.); (R.G.); (L.S.); (A.B.); (P.T.Q.); (E.G.); (P.S.); (F.R.)
- Laboratorio Interdipartimentale di Fisiopatologia della Riproduzione, Università degli Studi di Perugia, Edificio C, Piano 3 P.zza Lucio Severi, 1, Sant’Andrea delle Fratte, 06132 Perugia, Italy
| | - Luana Sallicandro
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via dell’Elce di Sotto 8, 06132 Perugia, Italy; (D.D.B.); (R.G.); (L.S.); (A.B.); (P.T.Q.); (E.G.); (P.S.); (F.R.)
- Department of Medicine and Surgery, Perugia Medical School, University of Perugia, Piazza Lucio Severi 1, 06132 Perugia, Italy
| | - Andrea Biagini
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via dell’Elce di Sotto 8, 06132 Perugia, Italy; (D.D.B.); (R.G.); (L.S.); (A.B.); (P.T.Q.); (E.G.); (P.S.); (F.R.)
- Department of Medicine and Surgery, Perugia Medical School, University of Perugia, Piazza Lucio Severi 1, 06132 Perugia, Italy
| | - Paola Tiziana Quellari
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via dell’Elce di Sotto 8, 06132 Perugia, Italy; (D.D.B.); (R.G.); (L.S.); (A.B.); (P.T.Q.); (E.G.); (P.S.); (F.R.)
- Department of Medicine and Surgery, Perugia Medical School, University of Perugia, Piazza Lucio Severi 1, 06132 Perugia, Italy
- ASST Grande Ospedale Metropolitano Niguarda, 20162 Milano, Italy
| | - Elko Gliozheni
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via dell’Elce di Sotto 8, 06132 Perugia, Italy; (D.D.B.); (R.G.); (L.S.); (A.B.); (P.T.Q.); (E.G.); (P.S.); (F.R.)
- Department of Medicine and Surgery, Perugia Medical School, University of Perugia, Piazza Lucio Severi 1, 06132 Perugia, Italy
- Department of Obstetrics and Gynecology, Faculty of Medicine, University of Tirana, AL1005 Tirana, Albania
| | - Paola Sabbatini
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via dell’Elce di Sotto 8, 06132 Perugia, Italy; (D.D.B.); (R.G.); (L.S.); (A.B.); (P.T.Q.); (E.G.); (P.S.); (F.R.)
| | - Francesco Ragonese
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via dell’Elce di Sotto 8, 06132 Perugia, Italy; (D.D.B.); (R.G.); (L.S.); (A.B.); (P.T.Q.); (E.G.); (P.S.); (F.R.)
- Laboratorio Interdipartimentale di Fisiopatologia della Riproduzione, Università degli Studi di Perugia, Edificio C, Piano 3 P.zza Lucio Severi, 1, Sant’Andrea delle Fratte, 06132 Perugia, Italy
| | - Antonio Malvasi
- Department of Biomedical Sciences and Human Oncology, University of Bari, 70121 Bari, Italy;
| | - Antonio D’Amato
- 1st Unit of Obstetrics and Gynecology, University of Bari, 70121 Bari, Italy;
| | | | - Giuseppe Trojano
- Department of Maternal and Child Health, “Madonna delle Grazie” Hospital ASM, 75100 Matera, Italy;
| | - Andrea Tinelli
- Department of Obstetrics and Gynecology and CERICSAL (CEntro di RIcerca Clinico SALentino), Veris delli Ponti Hospital, Via Giuseppina delli Ponti, 73020 Scorrano, Lecce, Italy
| | - Bernard Fioretti
- Department of Chemistry, Biology and Biotechnologies, University of Perugia, Via dell’Elce di Sotto 8, 06132 Perugia, Italy; (D.D.B.); (R.G.); (L.S.); (A.B.); (P.T.Q.); (E.G.); (P.S.); (F.R.)
- Laboratorio Interdipartimentale di Fisiopatologia della Riproduzione, Università degli Studi di Perugia, Edificio C, Piano 3 P.zza Lucio Severi, 1, Sant’Andrea delle Fratte, 06132 Perugia, Italy
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11
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Ju W, Zhao Y, Yu Y, Zhao S, Xiang S, Lian F. Mechanisms of mitochondrial dysfunction in ovarian aging and potential interventions. Front Endocrinol (Lausanne) 2024; 15:1361289. [PMID: 38694941 PMCID: PMC11061492 DOI: 10.3389/fendo.2024.1361289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/25/2023] [Accepted: 03/22/2024] [Indexed: 05/04/2024] Open
Abstract
Mitochondria plays an essential role in regulating cellular metabolic homeostasis, proliferation/differentiation, and cell death. Mitochondrial dysfunction is implicated in many age-related pathologies. Evidence supports that the dysfunction of mitochondria and the decline of mitochondrial DNA copy number negatively affect ovarian aging. However, the mechanism of ovarian aging is still unclear. Treatment methods, including antioxidant applications, mitochondrial transplantation, emerging biomaterials, and advanced technologies, are being used to improve mitochondrial function and restore oocyte quality. This article reviews key evidence and research updates on mitochondrial damage in the pathogenesis of ovarian aging, emphasizing that mitochondrial damage may accelerate and lead to cellular senescence and ovarian aging, as well as exploring potential methods for using mitochondrial mechanisms to slow down aging and improve oocyte quality.
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Affiliation(s)
- Wenhan Ju
- The First Clinical Medical College, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Yuewen Zhao
- CReATe Fertility Centre, Toronto, ON, Canada
| | - Yi Yu
- Department of Reproduction and Genetics, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Shuai Zhao
- The First Clinical Medical College, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Shan Xiang
- The First Clinical Medical College, Shandong University of Traditional Chinese Medicine, Jinan, China
| | - Fang Lian
- Department of Reproduction and Genetics, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, China
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12
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Wang X, Memon AA, Hedelius A, Grundberg A, Sundquist J, Sundquist K. Circulating mitochondrial long non-coding 7S RNA in primary health care patients with depression/anxiety. J Affect Disord 2024; 349:101-106. [PMID: 38163568 DOI: 10.1016/j.jad.2023.12.053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 11/27/2023] [Accepted: 12/23/2023] [Indexed: 01/03/2024]
Abstract
BACKGROUND The significant role of long non-coding 7S RNA in controlling mitochondrial transcription highlights its importance in mitochondrial function. Considering the suggested connection between mitochondrial dysfunction and the onset of mental disorders, this study aimed to explore the potential involvement of 7S RNA in the context of depression/anxiety. RESULTS A total of 181 patients in primary health care (age 20-64 years) with depression/anxiety and 59 healthy controls were included in the study. 7S RNA was measured using quantitative real-time PCR in plasma samples collected before (baseline) and after 8 weeks of treatment (mindfulness or cognitive-based behavioral therapy). Upon adjustment for age and sex, the baseline plasma levels of 7S RNA were significantly higher in patients than in healthy controls (p < 0.001). Notably, post-treatment, there was a significant reduction in 7S RNA levels (p = 0.03). These changes in 7S RNA were related to the treatment response, as indicated by HADS-D (Hospital Anxiety and Depression Scale) scores (ß = -0.04, p = 0.04), even after accounting for baseline scores and other cofounders. CONCLUSION The findings of this study indicate an association between plasma 7S RNA levels and depression/anxiety, as well as treatment response. While further confirmatory analyses are necessary, plasma 7S RNA holds promise as a potential predictive biomarker for both depression/anxiety and the treatment response within these disorders.
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Affiliation(s)
- Xiao Wang
- Center for Primary Health Care Research, Lund University/Region Skåne, Malmö 20502, Sweden.
| | - Ashfaque A Memon
- Center for Primary Health Care Research, Lund University/Region Skåne, Malmö 20502, Sweden
| | - Anna Hedelius
- Center for Primary Health Care Research, Lund University/Region Skåne, Malmö 20502, Sweden
| | - Anton Grundberg
- Center for Primary Health Care Research, Lund University/Region Skåne, Malmö 20502, Sweden
| | - Jan Sundquist
- Center for Primary Health Care Research, Lund University/Region Skåne, Malmö 20502, Sweden; Department of Family Medicine and Community Health, Department of Population Health Science and Policy Icahn School of Medicine at Mount Sinai, New York, USA; Center for Community-based Healthcare Research and Education (CoHRE), Department of Functional Pathology, School of Medicine, Shimane University, Japan
| | - Kristina Sundquist
- Center for Primary Health Care Research, Lund University/Region Skåne, Malmö 20502, Sweden; Department of Family Medicine and Community Health, Department of Population Health Science and Policy Icahn School of Medicine at Mount Sinai, New York, USA; Center for Community-based Healthcare Research and Education (CoHRE), Department of Functional Pathology, School of Medicine, Shimane University, Japan
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13
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Mathur S, Srivastava P, Srivastava A, Rai NK, Abbas S, Kumar A, Tiwari M, Sharma LK. Regulation of metastatic potential by drug repurposing and mitochondrial targeting in colorectal cancer cells. BMC Cancer 2024; 24:323. [PMID: 38459456 PMCID: PMC10921801 DOI: 10.1186/s12885-024-12064-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Accepted: 02/27/2024] [Indexed: 03/10/2024] Open
Abstract
BACKGROUND Increased mitochondrial activities contributing to cancer cell proliferation, invasion, and metastasis have been reported in different cancers; however, studies on the therapeutic targeting of mitochondria in regulating cell proliferation and invasiveness are limited. Because mitochondria are believed to have evolved through bacterial invasion in mammalian cells, antibiotics could provide an alternative approach to target mitochondria, especially in cancers with increased mitochondrial activities. In this study, we investigated the therapeutic potential of bacteriostatic antibiotics in regulating the growth potential of colorectal cancer (CRC) cells, which differ in their metastatic potential and mitochondrial functions. METHODS A combination of viability, cell migration, and spheroid formation assays was used to measure the effect on metastatic potential. The effect on mitochondrial mechanisms was investigated by measuring mitochondrial DNA copy number by qPCR, biogenesis (by qPCR and immunoblotting), and functions by measuring reactive oxygen species, membrane potential, and ATP using standard methods. In addition, the effect on assembly and activities of respiratory chain (RC) complexes was determined using blue native gel electrophoresis and in-gel assays, respectively). Changes in metastatic and cell death signaling were measured by immunoblotting with specific marker proteins and compared between CRC cells. RESULTS Both tigecycline and tetracycline effectively reduced the viability, migration, and spheroid-forming capacity of highly metastatic CRC cells. This increased sensitivity was attributed to reduced mtDNA content, mitochondrial biogenesis, ATP content, membrane potential, and increased oxidative stress. Specifically, complex I assembly and activity were significantly inhibited by these antibiotics in high-metastatic cells. Significant down-regulation in the expression of mitochondrial-mediated survival pathways, such as phospho-AKT, cMYC, phospho-SRC, and phospho-FAK, and upregulation in cell death (apoptosis and autophagy) were observed, which contributed to the enhanced sensitivity of highly metastatic CRC cells toward these antibiotics. In addition, the combined treatment of the CRC chemotherapeutic agent oxaliplatin with tigecycline/tetracycline at physiological concentrations effectively sensitized these cells at early time points. CONCLUSION Altogether, our study reports that bacterial antibiotics, such as tigecycline and tetracycline, target mitochondrial functions specifically mitochondrial complex I architecture and activity and would be useful in combination with cancer chemotherapeutics for high metastatic conditions.
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Affiliation(s)
- Shashank Mathur
- Department of Molecular Medicine and Biotechnology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Rae Bareli Road, (U.P.), Lucknow, 226014, India
| | - Pransu Srivastava
- Department of Molecular Medicine and Biotechnology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Rae Bareli Road, (U.P.), Lucknow, 226014, India
| | - Anubhav Srivastava
- Department of Molecular Medicine and Biotechnology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Rae Bareli Road, (U.P.), Lucknow, 226014, India
| | - Neeraj Kumar Rai
- Department of Molecular Medicine and Biotechnology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Rae Bareli Road, (U.P.), Lucknow, 226014, India
| | - Sabiya Abbas
- Department of Molecular Medicine and Biotechnology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Rae Bareli Road, (U.P.), Lucknow, 226014, India
| | - Ashok Kumar
- Department of Surgical Gastroenterology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Rae Bareli Road, (U.P.), Lucknow, 226014, India
| | - Meenakshi Tiwari
- Department of Biochemistry, All India Institute of Medical Sciences, Patna Bihar, 801507, India
| | - Lokendra Kumar Sharma
- Department of Molecular Medicine and Biotechnology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Rae Bareli Road, (U.P.), Lucknow, 226014, India.
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14
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Qin P, Qin T, Liang L, Li X, Jiang B, Wang X, Ma J, Hu F, Zhang M, Hu D. The role of mitochondrial DNA copy number in cardiometabolic disease: a bidirectional two-sample mendelian randomization study. Cardiovasc Diabetol 2024; 23:45. [PMID: 38282013 PMCID: PMC10823732 DOI: 10.1186/s12933-023-02074-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2023] [Accepted: 11/25/2023] [Indexed: 01/30/2024] Open
Abstract
BACKGROUND This study used a bidirectional 2-sample Mendelian randomization study to investigate the potential causal links between mtDNA copy number and cardiometabolic disease (obesity, hypertension, hyperlipidaemia, type 2 diabetes [T2DM], coronary artery disease [CAD], stroke, ischemic stroke, and heart failure). METHODS Genetic associations with mtDNA copy number were obtained from a genome-wide association study (GWAS) summary statistics from the UK biobank (n = 395,718) and cardio-metabolic disease were from largest available GWAS summary statistics. Inverse variance weighting (IVW) was conducted, with weighted median, MR-Egger, and MR-PRESSO as sensitivity analyses. We repeated this in the opposite direction using instruments for cardio-metabolic disease. RESULTS Genetically predicted mtDNA copy number was not associated with risk of obesity (P = 0.148), hypertension (P = 0.515), dyslipidemia (P = 0.684), T2DM (P = 0.631), CAD (P = 0.199), stroke (P = 0.314), ischemic stroke (P = 0.633), and heart failure (P = 0.708). Regarding the reverse directions, we only found that genetically predicted dyslipidemia was associated with decreased levels of mtDNA copy number in the IVW analysis (β= - 0.060, 95% CI - 0.044 to - 0.076; P = 2.416e-14) and there was suggestive of evidence for a potential causal association between CAD and mtDNA copy number (β= - 0.021, 95% CI - 0.003 to - 0.039; P = 0.025). Sensitivity and replication analyses showed the stable findings. CONCLUSIONS Findings of this Mendelian randomization study did not support a causal effect of mtDNA copy number in the development of cardiometabolic disease, but found dyslipidemia and CAD can lead to reduced mtDNA copy number. These findings have implications for mtDNA copy number as a biomarker of dyslipidemia and CAD in clinical practice.
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Affiliation(s)
- Pei Qin
- Department of General Practice, The Affiliated Luohu Hospital of Shenzhen University, No. 47, Youti Road, Shenzhen, 518001, Guangdong, China
| | - Tianhang Qin
- Institute of Software Chinese Academy of Sciences, Beijing, Guangdong, China
| | - Lei Liang
- Department of Gynecology and Obstetrics, Shenzhen Qianhai Shekou Free Trade Zone Hospital, Shenzhen, Guangdong, China
| | - Xinying Li
- School of Public Health, Shantou University, Shantou, Guangdong, China
| | - Bin Jiang
- Department of Neurology, Shenzhen Qianhai Shekou Free Trade Zone Hospital, Shenzhen, Guangdong, China
| | - Xiaojie Wang
- Department of Neurology, Shenzhen Qianhai Shekou Free Trade Zone Hospital, Shenzhen, Guangdong, China
| | - Jianping Ma
- Department of Neurology, Shenzhen Qianhai Shekou Free Trade Zone Hospital, Shenzhen, Guangdong, China
| | - Fulan Hu
- School of Public Health, Shenzhen University Health Science Center, Shenzhen, Guangdong, China
| | - Ming Zhang
- School of Public Health, Shenzhen University Health Science Center, Shenzhen, Guangdong, China
| | - Dongsheng Hu
- Department of General Practice, The Affiliated Luohu Hospital of Shenzhen University, No. 47, Youti Road, Shenzhen, 518001, Guangdong, China.
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15
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Koller A, Filosi M, Weissensteiner H, Fazzini F, Gorski M, Pattaro C, Schönherr S, Forer L, Herold JM, Stark KJ, Döttelmayer P, Hicks AA, Pramstaller PP, Würzner R, Eckardt KU, Heid IM, Fuchsberger C, Lamina C, Kronenberg F. Nuclear and mitochondrial genetic variants associated with mitochondrial DNA copy number. Sci Rep 2024; 14:2083. [PMID: 38267512 PMCID: PMC10808213 DOI: 10.1038/s41598-024-52373-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 01/17/2024] [Indexed: 01/26/2024] Open
Abstract
Mitochondrial DNA copy number (mtDNA-CN) is a biomarker for mitochondrial dysfunction associated with several diseases. Previous genome-wide association studies (GWAS) have been performed to unravel underlying mechanisms of mtDNA-CN regulation. However, the identified gene regions explain only a small fraction of mtDNA-CN variability. Most of this data has been estimated from microarrays based on various pipelines. In the present study we aimed to (1) identify genetic loci for qPCR-measured mtDNA-CN from three studies (16,130 participants) using GWAS, (2) identify potential systematic differences between our qPCR derived mtDNA-CN measurements compared to the published microarray intensity-based estimates, and (3) disentangle the nuclear from mitochondrial regulation of the mtDNA-CN phenotype. We identified two genome-wide significant autosomal loci associated with qPCR-measured mtDNA-CN: at HBS1L (rs4895440, p = 3.39 × 10-13) and GSDMA (rs56030650, p = 4.85 × 10-08) genes. Moreover, 113/115 of the previously published SNPs identified by microarray-based analyses were significantly equivalent with our findings. In our study, the mitochondrial genome itself contributed only marginally to mtDNA-CN regulation as we only detected a single rare mitochondrial variant associated with mtDNA-CN. Furthermore, we incorporated mitochondrial haplogroups into our analyses to explore their potential impact on mtDNA-CN. However, our findings indicate that they do not exert any significant influence on our results.
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Affiliation(s)
- Adriana Koller
- Institute of Genetic Epidemiology, Medical University of Innsbruck, Schöpfstrasse 41, 6020, Innsbruck, Austria
| | - Michele Filosi
- Eurac Research, Institute for Biomedicine, Affiliated Institute of the University of Lübeck, Bolzano, Italy
| | - Hansi Weissensteiner
- Institute of Genetic Epidemiology, Medical University of Innsbruck, Schöpfstrasse 41, 6020, Innsbruck, Austria
| | - Federica Fazzini
- Institute of Genetic Epidemiology, Medical University of Innsbruck, Schöpfstrasse 41, 6020, Innsbruck, Austria
| | - Mathias Gorski
- Department of Genetic Epidemiology, University of Regensburg, Regensburg, Germany
| | - Cristian Pattaro
- Eurac Research, Institute for Biomedicine, Affiliated Institute of the University of Lübeck, Bolzano, Italy
| | - Sebastian Schönherr
- Institute of Genetic Epidemiology, Medical University of Innsbruck, Schöpfstrasse 41, 6020, Innsbruck, Austria
| | - Lukas Forer
- Institute of Genetic Epidemiology, Medical University of Innsbruck, Schöpfstrasse 41, 6020, Innsbruck, Austria
| | - Janina M Herold
- Department of Genetic Epidemiology, University of Regensburg, Regensburg, Germany
| | - Klaus J Stark
- Department of Genetic Epidemiology, University of Regensburg, Regensburg, Germany
| | - Patricia Döttelmayer
- Institute of Genetic Epidemiology, Medical University of Innsbruck, Schöpfstrasse 41, 6020, Innsbruck, Austria
| | - Andrew A Hicks
- Eurac Research, Institute for Biomedicine, Affiliated Institute of the University of Lübeck, Bolzano, Italy
| | - Peter P Pramstaller
- Eurac Research, Institute for Biomedicine, Affiliated Institute of the University of Lübeck, Bolzano, Italy
| | - Reinhard Würzner
- Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, Innsbruck, Austria
| | - Kai-Uwe Eckardt
- Department of Nephrology and Hypertension, University Hospital Erlangen, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
- German Chronic Kidney Disease Study, Erlangen, Germany
- Department of Nephrology and Medical Intensive Care, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Iris M Heid
- Department of Genetic Epidemiology, University of Regensburg, Regensburg, Germany
| | - Christian Fuchsberger
- Eurac Research, Institute for Biomedicine, Affiliated Institute of the University of Lübeck, Bolzano, Italy
| | - Claudia Lamina
- Institute of Genetic Epidemiology, Medical University of Innsbruck, Schöpfstrasse 41, 6020, Innsbruck, Austria
| | - Florian Kronenberg
- Institute of Genetic Epidemiology, Medical University of Innsbruck, Schöpfstrasse 41, 6020, Innsbruck, Austria.
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16
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Khaleda L, Begum SK, Apu MAR, Chowdhury RH, Alam MJ, Datta A, Rahman MZ, Hosain N, Al-Forkan M. Arsenic-Induced Cardiovascular Diseases and their Correlation with Mitochondrial DNA Copy Number, Deletion, and Telomere Length in Bangladeshi Population. Cardiovasc Toxicol 2024; 24:27-40. [PMID: 37971645 DOI: 10.1007/s12012-023-09812-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 10/16/2023] [Indexed: 11/19/2023]
Abstract
Arsenic contamination is a global health concern, primarily through contaminated groundwater and its entry into the food chain. The association between arsenic exposure and cardiovascular diseases (CVDs) is particularly alarming due to CVDs being the leading cause of death worldwide. Arsenic exposure has also been linked to changes in telomere length, mitochondrial DNA copy number (mtDNAcn), and deletion, further increasing the risk of CVDs. We aimed to determine whether arsenic exposure alters telomere length and mtDNAcn and deletion in a total of 50 CVD patients who underwent open heart surgery hailed from known arsenic-affected and unaffected areas in Bangladesh. Amount of arsenic was determined from the collected nails and cardiac tissues. Relative telomere length and mtDNAcn and deletion were quantified by qRT-PCR. The patients from arsenic-contaminated areas had higher average arsenic deposits in their fingers and toenails (P < 0.05) and higher cardiac tissue injury scores (P < 0.05). Moreover, approximately 1.5-fold shorter telomere length (P < 0.05, r = - 0.775), 1.2-fold decreased mtDNAcn (P < 0.05, r = - 0.797), and an 81-fold higher amount of mitochondrial DNA deletion (P < 0.05, r = 0.784) were observed in the patients who had higher arsenic deposition in their nails. Higher levels of arsenic exposure were found to be linked to shorter telomere length, decreased mtDNAcn, and increased mitochondrial DNA deletion in the patients from As-affected areas. It can also be anticipated that the correlation of arsenic exposure with telomere length, mtDNAcn, and deletion can be used as biomarkers for early diagnosis of arsenic-induced cardiovascular diseases.
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Affiliation(s)
- Laila Khaleda
- Department of Genetic Engineering and Biotechnology, Faculty of Biological Sciences, University of Chittagong, Chittagong-4331, Bangladesh.
| | - Syeda Kishuara Begum
- Department of Genetic Engineering and Biotechnology, Faculty of Biological Sciences, University of Chittagong, Chittagong-4331, Bangladesh
| | - Md Abdur Rahman Apu
- Department of Genetic Engineering and Biotechnology, Faculty of Biological Sciences, University of Chittagong, Chittagong-4331, Bangladesh
| | - Rahee Hasan Chowdhury
- Department of Genetic Engineering and Biotechnology, Faculty of Biological Sciences, University of Chittagong, Chittagong-4331, Bangladesh
| | - Md Jibran Alam
- Department of Genetic Engineering and Biotechnology, Faculty of Biological Sciences, University of Chittagong, Chittagong-4331, Bangladesh
| | - Amit Datta
- Department of Genetic Engineering and Biotechnology, Faculty of Biological Sciences, University of Chittagong, Chittagong-4331, Bangladesh
| | - Md Zillur Rahman
- Department of Pathology, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh
| | - Nazmul Hosain
- Department of Cardiac Surgery, Chittagong Medical College Hospital, Chittagong-4203, Bangladesh
| | - Mohammad Al-Forkan
- Department of Genetic Engineering and Biotechnology, Faculty of Biological Sciences, University of Chittagong, Chittagong-4331, Bangladesh
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17
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Han S, Kim DK, Jun SE, Kim N. Association of sleep quality and mitochondrial DNA copy number in healthy middle-aged adults. Sleep Med 2024; 113:19-24. [PMID: 37979503 DOI: 10.1016/j.sleep.2023.11.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 11/03/2023] [Accepted: 11/04/2023] [Indexed: 11/20/2023]
Abstract
OBJECTIVES Mitochondria contribute to various compromised health, yet the association between sleep and mitochondria remains unclear. This study investigated the association between sleep quality and mitochondrial function in healthy middle-aged adults in the Republic of Korea. METHOD This cross-sectional study recruited 238 middle-aged adults using convenience sampling. Sleep quality was assessed using the Pittsburgh Sleep Quality Index (PSQI). Mitochondrial function, represented by mitochondrial DNA copy number (mtDNAcn), was measured using real-time quantitative polymerase chain reaction on peripheral blood leukocytes. Multivariate linear regression analyses were performed to determine the association between sleep quality and mtDNAcn. RESULTS Sleep quality was negatively associated with mtDNAcn (r = -.15, p = .025); the poor sleep quality group had a notably lower mtDNAcn compared to the good sleep quality group (t = 2.40, p = .017). Among the PSQI components, sleep latency was significantly associated with reduced mtDNAcn (r = -.18, p = .005). Univariate regression analysis revealed that mtDNAcn was significantly associated with education level (β = 0.15, p = .017), shift work (β = -0.17, p = .010), global PSQI score (β = -0.15, p = .025), and sleep latency (β = -0.18, p = .005). After adjusting for educational level and shift work in the final model, longer sleep latency was independently associated with reduced mtDNAcn (β = -.16, p = .011). CONCLUSIONS Poor sleep quality is associated with reduced mtDNAcn, suggesting a potential biological mechanism whereby poor sleep quality, specifically long sleep latency, accelerates cellular aging and impairs health through mitochondrial dysfunction. These findings enhance our understanding of the health effects of sleep quality and highlight the importance of screening and intervention strategies for mitochondrial dysfunction.
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Affiliation(s)
- Seolbin Han
- College of Nursing, Keimyung University, Daegu, 42601, Republic of Korea
| | - Dae-Kwang Kim
- School of Medicine, Keimyung University, Daegu, 42601, Republic of Korea
| | - Sang-Eun Jun
- College of Nursing, Keimyung University, Daegu, 42601, Republic of Korea
| | - Nahyun Kim
- College of Nursing, Keimyung University, Daegu, 42601, Republic of Korea.
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18
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Calarco CA, Keppetipola SM, Kumar G, Shipper AG, Lobo MK. Whole blood mitochondrial copy number in clinical populations with mood disorders: A meta-analysis: Blood mitochondrial copy number and mood disorders. Psychiatry Res 2024; 331:115662. [PMID: 38118327 DOI: 10.1016/j.psychres.2023.115662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 12/01/2023] [Accepted: 12/02/2023] [Indexed: 12/22/2023]
Abstract
Major depressive disorder (MDD) and bipolar disorder (BD), are globally prevalent, contributing to significant disease burden and adverse health outcomes. These mood disorders are associated with changes in many aspects of brain reward pathways, yet cellular and molecular changes in the brain are not readily available in clinical populations. Therefore, the use of biomarkers as proxies for changes in the brain are necessary. The proliferation of mitochondria in blood has emerged as a potentially useful biomarker, yet a clear consensus on how these mood disorders impact mitochondrial DNA copy number (mtDNAcn) has not been reached. To determine the current available consensus on the relationship of mood disorder diagnosis and blood mtDNcn, we performed a meta-analysis of available literature measuring this biomarker. Following PRISMA guidelines for a systematic search, 22 papers met inclusion criteria for meta-analysis (10 MDD, 10 BD, 2 both MDD and BD). We extracted demographic, disorder, and methodological information with mtDNAcn. Using the metafor package for R, calculated effect sizes were used in random effects or meta regression models for MDD and BD. Overall, our data suggest blood mtDNAcn may be a useful biomarker for mood disorders, with MDD and BD Type II associated with higher mtDNAcn, and BD Type I associated with lower mtDNAcn. Initially, we observed a trending increase in mtDNAcn in patients with MDD, which reached significance when one study with outlying demographic characteristics was excluded. Subgroup and meta-regression analysis indicated the relationship between mtDNAcn and diagnosis in patients with BD is dependent on BD type, while no relationship is detectable when BD types are mixed. Further study of blood mtDNAcn could predict downstream health outcomes or treatment responsivity in individuals with mood disorders.
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Affiliation(s)
- Cali A Calarco
- Department of Neurobiology, University of Maryland, 20 Penn Street, Baltimore, MD 21201 USA
| | | | - Gautam Kumar
- Department of Neurobiology, University of Maryland, 20 Penn Street, Baltimore, MD 21201 USA
| | - Andrea G Shipper
- Health Sciences and Human Services Library, University of Maryland, 601W. Lombard Street, Baltimore, MD 21201, USA
| | - Mary Kay Lobo
- Department of Neurobiology, University of Maryland, 20 Penn Street, Baltimore, MD 21201 USA.
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19
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Chen J, Zheng Q, Hicks JL, Trabzonlu L, Ozbek B, Jones T, Vaghasia AM, Larman TC, Wang R, Markowski MC, Denmeade SR, Pienta KJ, Hruban RH, Antonarakis ES, Gupta A, Dang CV, Yegnasubramanian S, De Marzo AM. MYC-driven increases in mitochondrial DNA copy number occur early and persist throughout prostatic cancer progression. JCI Insight 2023; 8:e169868. [PMID: 37971875 PMCID: PMC10807718 DOI: 10.1172/jci.insight.169868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 11/10/2023] [Indexed: 11/19/2023] Open
Abstract
Increased mitochondrial function may render some cancers vulnerable to mitochondrial inhibitors. Since mitochondrial function is regulated partly by mitochondrial DNA copy number (mtDNAcn), accurate measurements of mtDNAcn could help reveal which cancers are driven by increased mitochondrial function and may be candidates for mitochondrial inhibition. However, prior studies have employed bulk macrodissections that fail to account for cell type-specific or tumor cell heterogeneity in mtDNAcn. These studies have often produced unclear results, particularly in prostate cancer. Herein, we developed a multiplex in situ method to spatially quantify cell type-specific mtDNAcn. We show that mtDNAcn is increased in luminal cells of high-grade prostatic intraepithelial neoplasia (HGPIN), is increased in prostatic adenocarcinomas (PCa), and is further elevated in metastatic castration-resistant prostate cancer. Increased PCa mtDNAcn was validated by 2 orthogonal methods and is accompanied by increases in mtRNAs and enzymatic activity. Mechanistically, MYC inhibition in prostate cancer cells decreases mtDNA replication and expression of several mtDNA replication genes, and MYC activation in the mouse prostate leads to increased mtDNA levels in the neoplastic prostate cells. Our in situ approach also revealed elevated mtDNAcn in precancerous lesions of the pancreas and colon/rectum, demonstrating generalization across cancer types using clinical tissue samples.
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Affiliation(s)
- Jiayu Chen
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Qizhi Zheng
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Jessica L. Hicks
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Levent Trabzonlu
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Busra Ozbek
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Tracy Jones
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | | | - Tatianna C. Larman
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | | | | | - Sam R. Denmeade
- Department of Oncology and
- Department of Urology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Kenneth J. Pienta
- Department of Oncology and
- Department of Urology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Ralph H. Hruban
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- The Sol Goldman Pancreatic Cancer Research Center, Johns Hopkins Medicine, Baltimore, Maryland, USA
| | - Emmanuel S. Antonarakis
- Department of Oncology and
- Department of Urology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | | | - Chi V. Dang
- Department of Oncology and
- Department of Biochemistry and Molecular Biology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Srinivasan Yegnasubramanian
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Oncology and
- Department of Urology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Angelo M. De Marzo
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Oncology and
- Department of Urology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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20
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Kanazashi Y, Maejima K, Johnson TA, Sasagawa S, Jikuya R, Hasumi H, Matsumoto N, Maekawa S, Obara W, Nakagawa H. Mitochondrial DNA Variants at Low-Level Heteroplasmy and Decreased Copy Numbers in Chronic Kidney Disease (CKD) Tissues with Kidney Cancer. Int J Mol Sci 2023; 24:17212. [PMID: 38139039 PMCID: PMC10743237 DOI: 10.3390/ijms242417212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 11/28/2023] [Accepted: 11/30/2023] [Indexed: 12/24/2023] Open
Abstract
The human mitochondrial genome (mtDNA) is a circular DNA molecule with a length of 16.6 kb, which contains a total of 37 genes. Somatic mtDNA mutations accumulate with age and environmental exposure, and some types of mtDNA variants may play a role in carcinogenesis. Recent studies observed mtDNA variants not only in kidney tumors but also in adjacent kidney tissues, and mtDNA dysfunction results in kidney injury, including chronic kidney disease (CKD). To investigate whether a relationship exists between heteroplasmic mtDNA variants and kidney function, we performed ultra-deep sequencing (30,000×) based on long-range PCR of DNA from 77 non-tumor kidney tissues of kidney cancer patients with CKD (stages G1 to G5). In total, this analysis detected 697 single-nucleotide variants (SNVs) and 504 indels as heteroplasmic (0.5% ≤ variant allele frequency (VAF) < 95%), and the total number of detected SNVs/indels did not differ between CKD stages. However, the number of deleterious low-level heteroplasmic variants (pathogenic missense, nonsense, frameshift and tRNA) significantly increased with CKD progression (p < 0.01). In addition, mtDNA copy numbers (mtDNA-CNs) decreased with CKD progression (p < 0.001). This study demonstrates that mtDNA damage, which affects mitochondrial genes, may be involved in reductions in mitochondrial mass and associated with CKD progression and kidney dysfunction.
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Affiliation(s)
- Yuki Kanazashi
- Laboratory for Cancer Genomics, RIKEN Center for Integrative Medical Sciences, Yokohama 230-0045, Japan; (Y.K.); (K.M.); (T.A.J.); (S.S.)
- Department of Human Genetics, Yokohama City University, Yokohama 236-0004, Japan;
| | - Kazuhiro Maejima
- Laboratory for Cancer Genomics, RIKEN Center for Integrative Medical Sciences, Yokohama 230-0045, Japan; (Y.K.); (K.M.); (T.A.J.); (S.S.)
| | - Todd A. Johnson
- Laboratory for Cancer Genomics, RIKEN Center for Integrative Medical Sciences, Yokohama 230-0045, Japan; (Y.K.); (K.M.); (T.A.J.); (S.S.)
| | - Shota Sasagawa
- Laboratory for Cancer Genomics, RIKEN Center for Integrative Medical Sciences, Yokohama 230-0045, Japan; (Y.K.); (K.M.); (T.A.J.); (S.S.)
| | - Ryosuke Jikuya
- Department of Urology, Yokohama City University, Yokohama 236-0004, Japan; (R.J.); (H.H.)
| | - Hisashi Hasumi
- Department of Urology, Yokohama City University, Yokohama 236-0004, Japan; (R.J.); (H.H.)
| | - Naomichi Matsumoto
- Department of Human Genetics, Yokohama City University, Yokohama 236-0004, Japan;
| | - Shigekatsu Maekawa
- Department of Urology, Iwate Medical University, Iwate 028-3694, Japan; (S.M.); (W.O.)
| | - Wataru Obara
- Department of Urology, Iwate Medical University, Iwate 028-3694, Japan; (S.M.); (W.O.)
| | - Hidewaki Nakagawa
- Laboratory for Cancer Genomics, RIKEN Center for Integrative Medical Sciences, Yokohama 230-0045, Japan; (Y.K.); (K.M.); (T.A.J.); (S.S.)
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21
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Venkatesan D, Iyer M, Narayanasamy A, Gopalakrishnan AV, Vellingiri B. Plausible Role of Mitochondrial DNA Copy Number in Neurodegeneration-a Need for Therapeutic Approach in Parkinson's Disease (PD). Mol Neurobiol 2023; 60:6992-7008. [PMID: 37523043 DOI: 10.1007/s12035-023-03500-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Accepted: 07/11/2023] [Indexed: 08/01/2023]
Abstract
Parkinson's disease (PD) is an advancing age-associated progressive brain disorder which has various diverse factors, among them mitochondrial dysfunction involves in dopaminergic (DA) degeneration. Aging causes a rise in mitochondrial abnormalities which leads to structural and functional modifications in neuronal activity and cell death in PD. This ends in deterioration of mitochondrial function, mitochondrial alterations, mitochondrial DNA copy number (mtDNA CN) and oxidative phosphorylation (OXPHOS) capacity. mtDNA levels or mtDNA CN in PD have reported that mtDNA depletion would be a predisposing factor in PD pathogenesis. To maintain the mtDNA levels, therapeutic approaches have been focused on mitochondrial biogenesis in PD. The depletion of mtDNA levels in PD can be influenced by autophagic dysregulation, apoptosis, neuroinflammation, oxidative stress, sirtuins, and calcium homeostasis. The current review describes the regulation of mtDNA levels and discusses the plausible molecular pathways in mtDNA CN depletion in PD pathogenesis. We conclude by suggesting further research on mtDNA depletion which might show a promising effect in predicting and diagnosing PD.
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Affiliation(s)
- Dhivya Venkatesan
- Centre for Neuroscience, Department of Biotechnology, Karpagam Academy of Higher Education (Deemed to Be University), Coimbatore, 641021, India
| | - Mahalaxmi Iyer
- Centre for Neuroscience, Department of Biotechnology, Karpagam Academy of Higher Education (Deemed to Be University), Coimbatore, 641021, India
| | - Arul Narayanasamy
- Disease Proteomics Laboratory, Department of Zoology, Bharathiar University, Coimbatore, 641046, Tamil Nadu, India
| | - Abilash Valsala Gopalakrishnan
- Department of Biomedical Sciences, School of Biosciences and Technology, Vellore Institute of Technology, Tamil Nadu, Vellore, 632014, India
| | - Balachandar Vellingiri
- Cytogenetics and Stem Cell Laboratory, Department of Zoology, School of Basic Sciences, Central University of Punjab, Bathinda, Punjab, 151401, India.
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22
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Shoop WK, Lape J, Trum M, Powell A, Sevigny E, Mischler A, Bacman SR, Fontanesi F, Smith J, Jantz D, Gorsuch CL, Moraes CT. Efficient elimination of MELAS-associated m.3243G mutant mitochondrial DNA by an engineered mitoARCUS nuclease. Nat Metab 2023; 5:2169-2183. [PMID: 38036771 PMCID: PMC10730414 DOI: 10.1038/s42255-023-00932-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Accepted: 10/16/2023] [Indexed: 12/02/2023]
Abstract
Nuclease-mediated editing of heteroplasmic mitochondrial DNA (mtDNA) seeks to preferentially cleave and eliminate mutant mtDNA, leaving wild-type genomes to repopulate the cell and shift mtDNA heteroplasmy. Various technologies are available, but many suffer from limitations based on size and/or specificity. The use of ARCUS nucleases, derived from naturally occurring I-CreI, avoids these pitfalls due to their small size, single-component protein structure and high specificity resulting from a robust protein-engineering process. Here we describe the development of a mitochondrial-targeted ARCUS (mitoARCUS) nuclease designed to target one of the most common pathogenic mtDNA mutations, m.3243A>G. mitoARCUS robustly eliminated mutant mtDNA without cutting wild-type mtDNA, allowing for shifts in heteroplasmy and concomitant improvements in mitochondrial protein steady-state levels and respiration. In vivo efficacy was demonstrated using a m.3243A>G xenograft mouse model with mitoARCUS delivered systemically by adeno-associated virus. Together, these data support the development of mitoARCUS as an in vivo gene-editing therapeutic for m.3243A>G-associated diseases.
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Affiliation(s)
- Wendy K Shoop
- Precision BioSciences, Durham, NC, USA
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL, USA
| | | | | | | | | | | | - Sandra R Bacman
- Department of Neurology, University of Miami Miller School of Medicine, Miami, FL, USA
| | - Flavia Fontanesi
- Department of Biochemistry and Molecular Biology, University of Miami Miller School of Medicine, Miami, FL, USA
| | | | | | | | - Carlos T Moraes
- Department of Neurology, University of Miami Miller School of Medicine, Miami, FL, USA.
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23
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Koller A, Lamina C, Brandl C, Zimmermann ME, Stark KJ, Weissensteiner H, Würzner R, Heid IM, Kronenberg F. Systemic Evidence for Mitochondrial Dysfunction in Age-Related Macular Degeneration as Revealed by mtDNA Copy Number Measurements in Peripheral Blood. Int J Mol Sci 2023; 24:16406. [PMID: 38003595 PMCID: PMC10671207 DOI: 10.3390/ijms242216406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 11/09/2023] [Accepted: 11/14/2023] [Indexed: 11/26/2023] Open
Abstract
Mitochondrial dysfunction is a common occurrence in the aging process and is observed in diseases such as age-related macular degeneration (AMD). Increased levels of reactive oxygen species lead to damaged mitochondrial DNA (mtDNA), resulting in dysfunctional mitochondria, and, consequently, mtDNA causes further harm in the retinal tissue. However, it is unclear whether the effects are locally restricted to the high-energy-demanding retinal pigment epithelium or are also systematically present. Therefore, we measured mtDNA copy number (mtDNA-CN) in peripheral blood using a qPCR approach with plasmid normalization in elderly participants with and without AMD from the AugUR study (n = 2262). We found significantly lower mtDNA-CN in the blood of participants with early (n = 453) and late (n = 170) AMD compared to AMD-free participants (n = 1630). In regression analyses, we found lower mtDNA-CN to be associated with late AMD when compared with AMD-free participants. Each reduction of mtDNA-CN by one standard deviation increased the risk for late AMD by 24%. This association was most pronounced in geographic atrophy (OR = 1.76, 95% CI 1.19-2.60, p = 0.004), which has limited treatment options. These findings provide new insights into the relationship between mtDNA-CN in blood and AMD, suggesting that it may serve as a more accessible biomarker than mtDNA-CN in the retina.
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Affiliation(s)
- Adriana Koller
- Institute of Genetic Epidemiology, Medical University of Innsbruck, 6020 Innsbruck, Austria; (A.K.); (C.L.); (H.W.)
| | - Claudia Lamina
- Institute of Genetic Epidemiology, Medical University of Innsbruck, 6020 Innsbruck, Austria; (A.K.); (C.L.); (H.W.)
| | - Caroline Brandl
- Department of Genetic Epidemiology, University of Regensburg, 93053 Regensburg, Germany; (C.B.); (M.E.Z.); (K.J.S.); (I.M.H.)
- Department of Ophthalmology, University Hospital Regensburg, 93053 Regensburg, Germany
| | - Martina E. Zimmermann
- Department of Genetic Epidemiology, University of Regensburg, 93053 Regensburg, Germany; (C.B.); (M.E.Z.); (K.J.S.); (I.M.H.)
| | - Klaus J. Stark
- Department of Genetic Epidemiology, University of Regensburg, 93053 Regensburg, Germany; (C.B.); (M.E.Z.); (K.J.S.); (I.M.H.)
| | - Hansi Weissensteiner
- Institute of Genetic Epidemiology, Medical University of Innsbruck, 6020 Innsbruck, Austria; (A.K.); (C.L.); (H.W.)
| | - Reinhard Würzner
- Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, 6020 Innsbruck, Austria;
| | - Iris M. Heid
- Department of Genetic Epidemiology, University of Regensburg, 93053 Regensburg, Germany; (C.B.); (M.E.Z.); (K.J.S.); (I.M.H.)
| | - Florian Kronenberg
- Institute of Genetic Epidemiology, Medical University of Innsbruck, 6020 Innsbruck, Austria; (A.K.); (C.L.); (H.W.)
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24
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Al-Awadhi R, Alroomy M, Al-Waheeb S, Alwehaidah MS. Altered mitochondrial DNA copy number in cervical exfoliated cells among high‑risk HPV‑positive and HPV‑negative women. Exp Ther Med 2023; 26:521. [PMID: 37854504 PMCID: PMC10580246 DOI: 10.3892/etm.2023.12220] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 08/16/2023] [Indexed: 10/20/2023] Open
Abstract
The majority of cervical cancer cases are due to human papillomavirus (HPV) infection. However, certain cases of cervical cancer are not caused by HPV. Recent studies have shown a link between altered mitochondrial DNA (mtDNA) copy number, an indicative measure of mitochondrial dysfunction, and cervical cancer in women who test positive for HPV. However, the role of the mtDNA copy number in HPV-negative cervical cancer has remained elusive. In the present study, the mtDNA copy number was determined using quantitative PCR as the ratio between mtDNA and nuclear DNA in 287 ThinPrep cervical samples, including 143 cases with cervical abnormalities and 144 control subjects with high-risk (hr)-HPV positive or HPV-negative status. In an overall analysis of cases categorized based on the cytology diagnosis into squamous cervical carcinoma/high-grade squamous intraepithelial lesions (SCC/HSIL), low-grade squamous intraepithelial lesions (LSIL) and normal controls, the mtDNA copy number was significantly higher in all cases compared to the controls and a higher mtDNA copy number was observed in SCC/HSIL compared to LSIL cases. In the stratification analyses based on hr-HPV positive and HPV-negative status, an increased mtDNA copy number was observed in the cases compared with the controls regardless of their HPV status (P<0.05). When cases with cervical abnormalities were categorized based on histological diagnosis into cervical intraepithelial neoplasia (CIN)2/CIN3 and CIN1, an overall analysis indicated an increased mtDNA copy number in CIN2/CIN3 compared to CIN1 (P=0.01). Stratification analyses of these cases based on HPV status revealed a higher mtDNA copy number in CIN2/CIN3 compared to CIN1 regardless of HPV infection (P<0.05). These results showed that an elevated mtDNA copy number in subjects with cervical abnormalities was not influenced by the HPV status and suggested the possibility of its role in the progression of cervical cancer. The increased mtDNA copy number may be an adaptive response mechanism to compensate for mtDNA oxidative stress and energy deficiency, possibly induced by HPV infection and other environmental exposures.
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Affiliation(s)
- Rana Al-Awadhi
- Department of Medical Laboratory Sciences, Faculty of Allied Health Sciences, Kuwait University, Jabriyah 90805, Kuwait
| | - Moody Alroomy
- Department of Medical Laboratory Sciences, Faculty of Allied Health Sciences, Kuwait University, Jabriyah 90805, Kuwait
| | - Salah Al-Waheeb
- Cytology Laboratory, Maternity Hospital and Mubarak Al-Kabeer Hospital, Ministry of Health, Kuwait University, Jabriyah 90805, Kuwait
- Department of Pathology, Faculty of Medicine, Kuwait University, Jabriyah 90805, Kuwait
| | - Materah Salem Alwehaidah
- Department of Medical Laboratory Sciences, Faculty of Allied Health Sciences, Kuwait University, Jabriyah 90805, Kuwait
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25
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Alwehaidah MS, Alsabbagh M, Al-Kafaji G. Comprehensive analysis of mitochondrial DNA variants, mitochondrial DNA copy number and oxidative damage in psoriatic arthritis. Biomed Rep 2023; 19:85. [PMID: 37881602 PMCID: PMC10594069 DOI: 10.3892/br.2023.1667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Accepted: 09/19/2023] [Indexed: 10/27/2023] Open
Abstract
Growing evidence suggests that abnormalities in mitochondrial DNA (mtDNA) are involved in the pathogenesis of various inflammatory and immuno-mediated diseases. The present study analysed the entire mitochondrial genome by next-generation sequencing (NGS) in 23 patients with psoriatic arthritis (PsA) and 20 healthy controls to identify PsA-related variants. Changes in mtDNA copy number (mtDNAcn) were also evaluated by quantitative polymerase chain reaction (qPCR) and mtDNA oxidative damage was measured using an 8-hydroxy-2'-deoxyguanosine assay. NGS analysis revealed a total of 435 variants including 187 in patients with PsA only and 122 in controls only. Additionally, 126 common variants were found, of which 2 variants differed significantly in their frequencies among patients and controls (P<0.05), and may be associated with susceptibility to PsA. A total of 33 missense variants in mtDNA-encoded genes for complexes I, III, IV and V were identified only in patients with PsA. Of them, 25 variants were predicted to be deleterious by affecting the functions and structures of encoded proteins, and 13 variants were predicted to affect protein's stability. mtDNAcn analysis revealed decreased mtDNA content in patients with PsA compared with controls (P=0.0001) but the decrease in mtDNAcn was not correlated with patients' age or inflammatory biomarkers (P>0.05). Moreover, a higher level of oxidative damage was observed in patients with PsA compared with controls (P=0.03). The results of the present comprehensive analysis of mtDNA in PsA revealed that certain mtDNA variants may be implicated in the predisposition/pathogenesis of PsA, highlighting the importance of NGS in the identification of mtDNA variants in PsA. The current results also demonstrated that decreased mtDNAcn in PsA may be a consequence of increased oxidative stress. These data provide valuable insights into the contribution of mtDNA defects to the pathogenesis of PsA. Additional studies in larger cohorts are needed to elucidate the role of mtDNA defects in PsA.
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Affiliation(s)
- Materah Salem Alwehaidah
- Department of Medical Laboratory Sciences, Faculty of Allied Health Sciences, Kuwait University, City of Kuwait 31470, State of Kuwait
| | - Manhel Alsabbagh
- Department of Molecular Medicine and Al-Jawhara Centre for Molecular Medicine, Genetics, and Inherited Disorders, College of Medicine and Medical Sciences, Arabian Gulf University, Manama 26671, Kingdom of Bahrain
| | - Ghada Al-Kafaji
- Department of Molecular Medicine and Al-Jawhara Centre for Molecular Medicine, Genetics, and Inherited Disorders, College of Medicine and Medical Sciences, Arabian Gulf University, Manama 26671, Kingdom of Bahrain
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26
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Ogata H, Higasa K, Kageyama Y, Tahara H, Shimamoto A, Takekita Y, Koshikawa Y, Nonen S, Kato T, Kinoshita T, Kato M. Relationship between circulating mitochondrial DNA and microRNA in patients with major depression. J Affect Disord 2023; 339:538-546. [PMID: 37467797 DOI: 10.1016/j.jad.2023.07.073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 06/22/2023] [Accepted: 07/14/2023] [Indexed: 07/21/2023]
Abstract
BACKGROUND MicroRNAs (miRNAs) and circulating cell-free mitochondrial DNA (ccf-mtDNA) have attracted interest as biological markers of affective disorders. In response to stress, it is known that miRNAs in mitochondria diffuse out of the cytoplasm alongside mtDNA; however, this process has not yet been identified. We hypothesized that miRNAs derived from specific cell nuclei cause mitochondrial damage and mtDNA fragmentation under MDD-associated stress conditions. METHODS A comprehensive analysis of the plasma miRNA levels and quantification of the plasma ccf-mtDNA copy number were performed in 69 patients with depression to determine correlations and identify genes and pathways interacting with miRNAs. The patients were randomly assigned to receive either selective serotonin reuptake inhibitors (SSRI) or mirtazapine. Their therapeutic efficacy over four weeks was evaluated in relation to miRNAs correlated with ccf-mtDNA copy number. RESULTS The expression levels of the five miRNAs showed a significant positive correlation with the ccf-mtDNA copy number after correcting for multiple testing. These miRNAs are involved in gene expression related to thyroid hormone synthesis, the Hippo signaling pathway, vasopressin-regulated water reabsorption, and lysine degradation. Of these five miRNAs, miR-6068 and miR-4708-3p were significantly associated with the SSRI and mirtazapine treatment outcomes, respectively. LIMITATIONS This study did not show comparison with a healthy group. CONCLUSIONS The expression levels of specific miRNAs were associated with ccf-mtDNA copy number in untreated depressed patients; moreover, these miRNAs were linked to antidepressant treatment outcomes. These findings are expected to lead to the elucidation of new pathological mechanism of depression.
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Affiliation(s)
- Haruhiko Ogata
- Department of Neuropsychiatry, Kansai Medical University, Osaka, Japan
| | - Koichiro Higasa
- Institute of Biomedical Science, Department of Genome Analysis, Kansai Medical University, Osaka, Japan
| | - Yuki Kageyama
- Department of Neuropsychiatry, Graduate School of Medicine, Osaka Metropolitan University, Osaka, Japan
| | - Hidetoshi Tahara
- Graduate School of Biomedical & Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Akira Shimamoto
- Faculty of Pharmaceutical Sciences, Sanyo-Onoda City University, Sanyo Onoda, Yamaguchi, Japan
| | | | - Yosuke Koshikawa
- Department of Neuropsychiatry, Kansai Medical University, Osaka, Japan
| | - Shinpei Nonen
- Department of Pharmacy, Hyogo University of Health Sciences, Hyogo, Japan
| | - Tadafumi Kato
- Department of Psychiatry & Behavioral Science, Juntendo University Graduate School of Medicine, Tokyo, Japan
| | | | - Masaki Kato
- Department of Neuropsychiatry, Kansai Medical University, Osaka, Japan.
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27
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Zhu Z, Gong M, Gong W, Wang B, Li C, Hou Q, Guo H, Chai J, Guan J, Jia Y. SHF confers radioresistance in colorectal cancer by the regulation of mitochondrial DNA copy number. Clin Exp Med 2023; 23:2457-2471. [PMID: 36527512 DOI: 10.1007/s10238-022-00969-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Accepted: 12/01/2022] [Indexed: 12/23/2022]
Abstract
Altered mitochondrial function contributes greatly to pathogenesis and progression of colorectal cancer. In this study, we report a functional pool of Src homology 2 domain-containing F (SHF) in mitochondria controlling the response of colorectal cancer cells to radiation therapy. We found that elevated expression of SHF in cancer cells is essential for promoting mitochondrial function by increasing mitochondrial DNA copy number, thus reducing the sensitivity of colorectal cancer cells to radiation. Mechanistically, SHF binds to mitochondrial DNA and promotes POLG/SSBP1-mediated mitochondrial DNA synthesis. Importantly, SHF loss-mediated radiosensitization was phenocopied by depletion of mitochondrial DNA. Thus, our data demonstrate that mitochondrial SHF is an important regulator of radioresistance in colorectal cancer cells, identifying SHF as a promising therapeutic target to enhance radiotherapy efficacy in colorectal cancer.
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Affiliation(s)
- Zhenyu Zhu
- Gastrointestinal Surgery Ward II, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China
| | - Meihua Gong
- Thoracic Surgery Ward II, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China
| | - Weipeng Gong
- Gastrointestinal Surgery Ward II, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China
| | - Bishi Wang
- Gastrointestinal Surgery Ward II, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China
| | - Changhao Li
- Gastrointestinal Surgery Ward II, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China
| | - Qingsheng Hou
- Gastrointestinal Surgery Ward II, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China
| | - Hongliang Guo
- Gastrointestinal Surgery Ward II, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China
| | - Jie Chai
- Gastrointestinal Surgery Ward I, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China
| | - Jie Guan
- Gastrointestinal Surgery Ward II, Shandong Cancer Hospital and Institute, Shandong First Medical University and Shandong Academy of Medical Sciences, Jinan, China.
| | - Yanhan Jia
- Sichuan Cancer Hospital and Institute, Sichuan Cancer Center, School of Medicine, University of Electronic Science and Technology of China, Chengdu, China.
- Radiation Oncology Key Laboratory of Sichuan Province, Chengdu, China.
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Catheline SE, Kaiser E, Eliseev RA. Mitochondrial Genetics and Function as Determinants of Bone Phenotype and Aging. Curr Osteoporos Rep 2023; 21:540-551. [PMID: 37542684 DOI: 10.1007/s11914-023-00816-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/12/2023] [Indexed: 08/07/2023]
Abstract
PURPOSE OF REVIEW The purpose of this review is to summarize the recently published scientific literature regarding the effects of mitochondrial function and mitochondrial genome mutations on bone phenotype and aging. RECENT FINDINGS While aging and sex steroid levels have traditionally been considered the most important risk factors for development of osteoporosis, mitochondrial function and genetics are being increasingly recognized as important determinants of bone health. Recent studies indicate that mitochondrial genome variants found in different human populations determine the risk of complex degenerative diseases. We propose that osteoporosis should be among such diseases. Studies have shown the deleterious effects of mitochondrial DNA mutations and mitochondrial dysfunction on bone homeostasis. Mediators of such effects include oxidative stress, mitochondrial permeability transition, and dysregulation of autophagy. Mitochondrial health plays an important role in bone homeostasis and aging, and understanding underlying mechanisms is critical in leveraging this relationship clinically for therapeutic benefit.
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Affiliation(s)
- Sarah E Catheline
- Center for Musculoskeletal Research, University of Rochester School of Medicine and Dentistry, Rochester, USA
| | - Ethan Kaiser
- Department of Pharmacology and Physiology, University of Rochester School of Medicine and Dentistry, Rochester, USA
| | - Roman A Eliseev
- Center for Musculoskeletal Research, University of Rochester School of Medicine and Dentistry, Rochester, USA.
- Department of Pharmacology and Physiology, University of Rochester School of Medicine and Dentistry, Rochester, USA.
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Raina R, Shetty DC, Nasreen N, DAS S, Sethi A, Chikara A, Rai G, Kumar A, Tulsyan S, Sisodiya S, Hussain S. Mitochondrial DNA content as a biomarker for oral carcinogenesis: correlation with clinicopathologic parameters. Minerva Dent Oral Sci 2023; 72:211-220. [PMID: 37066891 DOI: 10.23736/s2724-6329.23.04756-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2023]
Abstract
BACKGROUND Mitochondrial genome (mtDNA) exhibits greater vulnerability to mutations and/or copy number variations than nuclear counterpart (nDNA) in both normal and cancer cells due to oxidative stress generated by inflammation, viral infections, physical, mechanical, and chemical load. The study was designed to evaluate the mtDNA content in oral potentially malignant disorders (OPMDs) and oral squamous cell carcinoma (OSCC). Various parameters were analyzed including its variation with human papillomavirus (HPV) during oral carcinogenesis. METHODS The present cross-sectional study comprised of two hundred patients (100 OPMDs and 100 OSCCs) and 100 healthy controls. PCR amplifications were done for mtDNA content and HPV in OPMDs and OSCC using real-time and conventional PCR respectively. RESULTS The relative mtDNA content was assessed quantitatively and it was observed that mtDNA was greater in OSCC (7.60±0.94) followed by OPMDs (5.93±0.92) and controls (5.37±0.95). It showed a positive linear correlation with habits and increasing histopathological grades. Total HPV-positive study groups showed higher mtDNA content (7.06±1.64) than HPV-negative counterparts (6.21±1.29). CONCLUSIONS An elevated mutant mtDNA may be attributed to increased free radicals and selective cell clonal proliferation in test groups. Moreover, sustained HPV infection enhances tumorigenesis through mitochondria mediated apoptosis. Since, mtDNA content is directly linked to oxidative DNA damage, these quantifications might serve as a surrogate measure for invasiveness in dysplastic lesions and typify their malignant potential.
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Affiliation(s)
- Reema Raina
- Division of Cellular and Molecular Diagnostics (Molecular Biology Group), ICMR-National Institute of Cancer Prevention and Research, Indian Council of Medical Research, Noida, India
- Department of Oral and Maxillofacial Pathology and Microbiology, I.T.S. Centre for Dental Studies and Research, Muradnagar, India
| | - Devi C Shetty
- Department of Oral and Maxillofacial Pathology and Microbiology, I.T.S. Centre for Dental Studies and Research, Muradnagar, India
| | - Nighat Nasreen
- Department of Oral Pathology and Microbiology, Divya Jyoti College of Dental Sciences and Research, Modinagar, India
| | - Shukla DAS
- Department of Microbiology, University College of Medical Sciences and GTB Hospital, Dilshad Garden, New Delhi, India
| | - Aashka Sethi
- Department of Oral and Maxillofacial Pathology and Microbiology, I.T.S. Centre for Dental Studies and Research, Muradnagar, India
| | - Atul Chikara
- Division of Cellular and Molecular Diagnostics (Molecular Biology Group), ICMR-National Institute of Cancer Prevention and Research, Indian Council of Medical Research, Noida, India
| | - Gargi Rai
- Department of Microbiology, University College of Medical Sciences and GTB Hospital, Dilshad Garden, New Delhi, India
| | - Anshuman Kumar
- Department of Surgical Oncology, Dharamshila Narayana Superspeciality Hospital, Vasundhara Enclave, New Delhi, India
| | - Sonam Tulsyan
- Division of Cellular and Molecular Diagnostics (Molecular Biology Group), ICMR-National Institute of Cancer Prevention and Research, Indian Council of Medical Research, Noida, India
| | - Sandeep Sisodiya
- Division of Cellular and Molecular Diagnostics (Molecular Biology Group), ICMR-National Institute of Cancer Prevention and Research, Indian Council of Medical Research, Noida, India
| | - Showket Hussain
- Division of Cellular and Molecular Diagnostics (Molecular Biology Group), ICMR-National Institute of Cancer Prevention and Research, Indian Council of Medical Research, Noida, India -
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Holt AG, Davies AM. The prevalence of dementia in humans could be the result of a functional adaptation. Comput Biol Chem 2023; 106:107939. [PMID: 37598466 DOI: 10.1016/j.compbiolchem.2023.107939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Revised: 07/31/2023] [Accepted: 08/07/2023] [Indexed: 08/22/2023]
Abstract
In this paper we propose that high copy number of the mitochondrial genome in neurons is a functional adaptation. We simulated the proliferation of deletion mutants of the human mitochondrial genome in a virtual mitochondrion and recorded the cell loss rates due to deletions overwhelming the wild-type. Our results showed that cell loss increased with mtDNA copy number. Given that neuron loss equates to cognitive dysfunction, it would seem counterintuitive that there would be a selective pressure for high copy number over low. However, for a low copy number, the onset of cognitive decline, while mild, started early in life. Whereas, for high copy number, it did not start until middle age but progressed rapidly. There could have been an advantage to high copy number in the brain if it delayed the onset of cognitive decline until after reproductive age. The prevalence of dementia in our aged population is a consequence of this functional adaptation.
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Czarny P, Ziółkowska S, Kołodziej Ł, Watała C, Wigner-Jeziorska P, Bliźniewska-Kowalska K, Wachowska K, Gałecka M, Synowiec E, Gałecki P, Bijak M, Szemraj J, Śliwiński T. Single-Nucleotide Polymorphisms in Genes Maintaining the Stability of Mitochondrial DNA Affect the Occurrence, Onset, Severity and Treatment of Major Depressive Disorder. Int J Mol Sci 2023; 24:14752. [PMID: 37834200 PMCID: PMC10573273 DOI: 10.3390/ijms241914752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Revised: 09/26/2023] [Accepted: 09/27/2023] [Indexed: 10/15/2023] Open
Abstract
One of the key features of major depressive disorder (MDD, depression) is increased oxidative stress manifested by elevated levels of mtROS, a hallmark of mitochondrial dysfunction, which can arise from mitochondrial DNA (mtDNA) damage. Thus, the current study explores possibility that the single-nucleotide polymorphisms (SNPs) of genes encoding the three enzymes that are thought to be implicated in the replication, repair or degradation of mtDNA, i.e., POLG, ENDOG and EXOG, have an impact on the occurrence, onset, severity and treatment of MDD. Five SNPs were selected: EXOG c.-188T > G (rs9838614), EXOG c.*627G > A (rs1065800), POLG c.-1370T > A (rs1054875), ENDOG c.-394T > C (rs2977998) and ENDOG c.-220C > T (rs2997922), while genotyping was performed on 538 DNA samples (277 cases and 261 controls) using TaqMan probes. All SNPs of EXOG and ENDOG modulated the risk of depression, but the strongest effect was observed for rs1065800, while rs9838614 and rs2977998 indicate that they might influence the severity of symptoms, and, to a lesser extent, treatment effectiveness. Although the SNP located in POLG did not affect occurrence of the disease, the result suggests that it may influence the onset and treatment outcome. These findings further support the hypothesis that mtDNA damage and impairment in its metabolism play a crucial role not only in the development, but also in the treatment of depression.
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Affiliation(s)
- Piotr Czarny
- Department of Medical Biochemistry, Medical University of Lodz, 92-215 Lodz, Poland; (S.Z.); (J.S.)
| | - Sylwia Ziółkowska
- Department of Medical Biochemistry, Medical University of Lodz, 92-215 Lodz, Poland; (S.Z.); (J.S.)
| | - Łukasz Kołodziej
- Laboratory of Medical Genetics, Faculty of Biology and Environmental Protection, University of Lodz, 92-215 Lodz, Poland; (Ł.K.)
| | - Cezary Watała
- Department of Haemostatic Disorders, Medical University of Lodz, 92-215 Lodz, Poland;
| | - Paulina Wigner-Jeziorska
- Department of General Biochemistry, Faculty of Biology and Environmental Protection, University of Lodz, 90-136 Lodz, Poland;
| | | | - Katarzyna Wachowska
- Department of Adult Psychiatry, Medical University of Lodz, 91-229 Lodz, Poland; (K.B.-K.); (K.W.); (P.G.)
| | - Małgorzata Gałecka
- Department of Psychotherapy, Medical University of Lodz, 91-229 Lodz, Poland;
| | - Ewelina Synowiec
- Laboratory of Medical Genetics, Faculty of Biology and Environmental Protection, University of Lodz, 92-215 Lodz, Poland; (Ł.K.)
| | - Piotr Gałecki
- Department of Adult Psychiatry, Medical University of Lodz, 91-229 Lodz, Poland; (K.B.-K.); (K.W.); (P.G.)
| | - Michał Bijak
- Biohazard Prevention Centre, Faculty of Biology and Environmental Protection, University of Lodz, 90-136 Lodz, Poland;
| | - Janusz Szemraj
- Department of Medical Biochemistry, Medical University of Lodz, 92-215 Lodz, Poland; (S.Z.); (J.S.)
| | - Tomasz Śliwiński
- Laboratory of Medical Genetics, Faculty of Biology and Environmental Protection, University of Lodz, 92-215 Lodz, Poland; (Ł.K.)
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Calarco CA, Keppetipola SM, Kumar G, Shipper AG, Lobo MK. Whole blood mitochondrial copy number in clinical populations with mood disorders: a meta-analysis. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.13.557572. [PMID: 37745411 PMCID: PMC10515896 DOI: 10.1101/2023.09.13.557572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/26/2023]
Abstract
Background Major depressive disorder (MDD) and bipolar disorder (BD), are globally prevalent, contributing to significant disease burden and adverse health outcomes. These mood disorders are associated with changes in many aspects of brain reward pathways, yet cellular and molecular changes in the brain are not readily available in clinical populations. Therefore, the use of biomarkers as proxies for changes in the brain are necessary. The proliferation of mitochondria in blood has emerged as a potentially useful biomarker, yet a clear consensus on how these mood disorders impact mitochondrial DNA copy number (mtDNAcn) has not been reached. Methods Following PRISMA guidelines for a systematic search, 22 papers met inclusion criteria for meta-analysis (10 MDD, 10 BD, 2 both MDD and BD). We extracted demographic, disorder, and methodological information with mtDNAcn. Using the metafor package for R, calculated effect sizes were used in random effects or meta regression models for MDD and BD. Results Our results show a trending increase in mtDNAcn in patients with MDD, which reaches significance when one study with outlying demographic characteristics is excluded. Overall, there was no effect of BD on mtDNAcn, however, further subgroup and meta-regression analysis indicated the effects on mtDNAcn are dependent on BD type. Conclusions Together our data suggest whole blood/leukocyte mtDNAcn may be a useful biomarker for mood disorders, with MDD and BD Type II associated with higher mtDNAcn, and BD Type I associated with lower mtDNAcn. Further study of blood mtDNAcn could predict downstream health outcomes or treatment responsivity in individuals with mood disorders.
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Reid DM, Barber RC, Jones HP, Thorpe RJ, Sun J, Zhou Z, Phillips NR. Integrative blood-based characterization of oxidative mitochondrial DNA damage variants implicates Mexican American's metabolic risk for developing Alzheimer's disease. Sci Rep 2023; 13:14765. [PMID: 37679478 PMCID: PMC10484983 DOI: 10.1038/s41598-023-41190-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 08/23/2023] [Indexed: 09/09/2023] Open
Abstract
Alzheimer's Disease (AD) continues to be a leading cause of death in the US. As the US aging population (ages 65 +) expands, the impact will disproportionately affect vulnerable populations, e.g., Hispanic/Latino population, due to their AD-related health disparities. Age-related regression in mitochondrial activity and ethnic-specific differences in metabolic burden could potentially explain in part the racial/ethnic distinctions in etiology that exist for AD. Oxidation of guanine (G) to 8-oxo-guanine (8oxoG) is a prevalent lesion and an indicator of oxidative stress and mitochondrial dysfunction. Damaged mtDNA (8oxoG) can serve as an important marker of age-related systemic metabolic dysfunction and upon release into peripheral circulation may exacerbate pathophysiology contributing to AD development and/or progression. Analyzing blood samples from Mexican American (MA) and non-Hispanic White (NHW) participants enrolled in the Texas Alzheimer's Research & Care Consortium, we used blood-based measurements of 8oxoG from both buffy coat PBMCs and plasma to determine associations with population, sex, type-2 diabetes, and AD risk. Our results show that 8oxoG levels in both buffy coat and plasma were significantly associated with population, sex, years of education, and reveal a potential association with AD. Furthermore, MAs are significantly burdened by mtDNA oxidative damage in both blood fractions, which may contribute to their metabolic vulnerability to developing AD.
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Affiliation(s)
- Danielle Marie Reid
- Microbiology, Immunology, and Genetics, School of Biomedical Sciences, UNT Health Science Center, Fort Worth, TX, USA
| | - Robert C Barber
- Family Medicine, Texas College of Osteopathic Medicine, UNT Health Science Center, Fort Worth, TX, USA
- Institue for Translational Research, UNT Health Science Center, Fort Worth, TX, USA
| | - Harlan P Jones
- Microbiology, Immunology, and Genetics, School of Biomedical Sciences, UNT Health Science Center, Fort Worth, TX, USA
| | - Roland J Thorpe
- Microbiology, Immunology, and Genetics, School of Biomedical Sciences, UNT Health Science Center, Fort Worth, TX, USA
- Johns Hopkins Center for Health Disparities Solutions, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Jie Sun
- Microbiology, Immunology, and Genetics, School of Biomedical Sciences, UNT Health Science Center, Fort Worth, TX, USA
| | - Zhengyang Zhou
- Biostatistics and Epidemiology, School of Public Health, UNT Health Science Center, Fort Worth, TX, USA
| | - Nicole R Phillips
- Microbiology, Immunology, and Genetics, School of Biomedical Sciences, UNT Health Science Center, Fort Worth, TX, USA.
- Institue for Translational Research, UNT Health Science Center, Fort Worth, TX, USA.
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Chen Y, Wu WJ, Xing LW, Zhang XJ, Wang J, Xia XY, Zhao R, Zhao R. Investigating the role of mitochondrial DNA D-loop variants, haplotypes, and copy number in polycystic ovary syndrome: implications for clinical phenotypes in the Chinese population. Front Endocrinol (Lausanne) 2023; 14:1206995. [PMID: 37745710 PMCID: PMC10512090 DOI: 10.3389/fendo.2023.1206995] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Accepted: 07/11/2023] [Indexed: 09/26/2023] Open
Abstract
Background The presence of genetic variations in mitochondrial DNA (mtDNA) has been associated with a diverse array of diseases. The objective of this study was to examine the correlations between mtDNA D-loop, its haplotypes, and polycystic ovary syndrome (PCOS) in the Chinese population, and the associations between mtDNA D-loop and symptoms of PCOS. The study also sought to determine whether the mtDNA copy number in Chinese patients with PCOS differed from that of individuals in the control group. Methods Infertile individuals who only had tubal or male factor treatment were the focus of research by The Cancer Genome Atlas (TCGA) and Gene Expression Omnibus (GEO). mtDNA haplotypes were categorized using polymorphic D-loop sites. mtDNA D-loop, PCOS features, and mtDNA haplotypes were analyzed using R software to determine the strength of the association between the three. There are certain DNA haplotypes linked to PCOS. Microdroplet digital polymerase chain reaction (PCR) was used to determine the mtDNA copy number in a convenience sample of 168 PCOS patients and 83 controls. Results Among the research group, the majority of D-loop mutations were infrequent (frequency< 1%), with only 45 variants displaying a minimum allele frequency (MAF) of 5% or higher. No association was found between polymorphism loci in PCOS patients and body mass index (BMI). Noteworthy, C194T, 1A200G, 523delAC, and C16234T showed positive correlations with elevated LH/FSH levels. Additionally, specific polymorphic loci G207A, 16036GGins, and 16049Gins within the D-loop region of mtDNA potentially exerted a protective role in PCOS development. Conversely, no statistical significance was observed in the expression levels of C16291T and T489C. Chinese women with mtDNA haplotype A15 exhibited a decreased risk of developing PCOS. Moreover, a significant difference in mtDNA copy number was detected, with controls averaging 25.87 (21.84, 34.81), while PCOS patients had a mean of 129.91 (99.38, 168.63). Conclusion Certain mtDNA D-loop mutations and haplotypes appear to confer protection against PCOS in Chinese women. In addition, elevated mtDNA copy number may serve as an indicator during early stages of PCOS.
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Affiliation(s)
- Yang Chen
- Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China
- Department of TCM (Traditional Chinese Medicine), Hainan Women and Children’s Medical Center, Haikou, Hainan, China
| | - Wei-jia Wu
- Department of Scientific Research, Hainan Women and Children’s Medical Center, Haikou, Hainan, China
| | - Li-wei Xing
- Yunnan University of Chinese Medicine, Kunming, Yunnan, China
| | - Xiao-juan Zhang
- Department of TCM (Traditional Chinese Medicine), Hainan Women and Children’s Medical Center, Haikou, Hainan, China
| | - Jing Wang
- Department of TCM (Traditional Chinese Medicine), Hainan Women and Children’s Medical Center, Haikou, Hainan, China
| | - Xiao-yan Xia
- Department of TCM (Traditional Chinese Medicine), Hainan Women and Children’s Medical Center, Haikou, Hainan, China
| | - Rui Zhao
- Department of TCM (Traditional Chinese Medicine), Hainan Women and Children’s Medical Center, Haikou, Hainan, China
| | - Rong Zhao
- Nanjing University of Chinese Medicine, Nanjing, Jiangsu, China
- Yunnan University of Chinese Medicine, Kunming, Yunnan, China
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Seewald LA, Sabino IG, Montney KL, Delco ML. Synovial fluid mitochondrial DNA concentration reflects the degree of cartilage damage after naturally occurring articular injury. Osteoarthritis Cartilage 2023; 31:1056-1065. [PMID: 37028640 PMCID: PMC10524327 DOI: 10.1016/j.joca.2023.03.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 02/27/2023] [Accepted: 03/19/2023] [Indexed: 04/09/2023]
Abstract
OBJECTIVE To evaluate mitochondrial DNA (mtDNA) release from injured chondrocytes and investigate the utility of synovial fluid mtDNA concentration in early detection of posttraumatic osteoarthritis. METHOD We measured mtDNA release using four models of osteoarthritis: in vitro interleukin-1β stimulation of cultured equine chondrocytes, ex vivo mechanical impact of bovine cartilage explants, in vivo mechanical impact of equine articular cartilage, and naturally occurring equine intraarticular fracture. In our in vivo model, one group was treated with an intraarticular injection of the mitoprotective peptide SS-31 following cartilage injury. mtDNA content was quantified using qPCR. For naturally occurring cases of joint injury, clinical data (radiographs, arthroscopic video footage) were scored for criteria associated with degenerative joint disease. RESULTS Chondrocytes released mtDNA in the acute time frame following inflammatory and mechanical cellular stress in vitro. mtDNA was increased in equine synovial fluid following experimental and naturally occurring injury to the joint surface. In naturally occurring posttraumatic osteoarthritis, we found a strong positive correlation between the degree of cartilage damage and mtDNA concentration (r = 0.80, P = 0.0001). Finally, impact-induced mtDNA release was mitigated by mitoprotective treatment. CONCLUSION Changes in synovial fluid mtDNA occur following joint injury and correlate with the severity of cartilage damage. Mitoprotection mitigates increases in synovial fluid mtDNA suggesting that mtDNA release may reflect mitochondrial dysfunction. Further investigation of mtDNA as a potentially sensitive marker of early articular injury and response to mitoprotective therapy is warranted.
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Affiliation(s)
- L A Seewald
- College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.
| | - I G Sabino
- College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.
| | - K L Montney
- College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.
| | - M L Delco
- College of Veterinary Medicine, Cornell University, Ithaca, NY, USA.
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Al-Kafaji G, Jahrami HA, Alwehaidah MS, Alshammari Y, Husni M. Mitochondrial DNA copy number in autism spectrum disorder and attention deficit hyperactivity disorder: a systematic review and meta-analysis. Front Psychiatry 2023; 14:1196035. [PMID: 37484684 PMCID: PMC10361772 DOI: 10.3389/fpsyt.2023.1196035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 06/21/2023] [Indexed: 07/25/2023] Open
Abstract
Background Several reports suggest that altered mitochondrial DNA copy number (mtDNA-cn), a common biomarker for aberrant mitochondrial function, is implicated in autism spectrum disorder (ASD) and attention deficit hyperactivity disorder (ADHD), but the results are still elusive. Methods A meta-analysis was performed to summarize the current indication and to provide a more precise assessment of the mtDNA-cn in ASD and ADHD. A search in the MEDLINE-PubMed, Scopus, and EMBASE databases was done to identify related studies up to the end of February 2023. The meta-analysis was conducted according to recommendations of the Cochrane Handbook of Systematic Reviews. Results Fourteen studies involving 666 cases with ASD and ADHD and 585 controls were collected and judged relevant for the systematic review and meta-analysis. The pooled results by a random effects meta-analysis was reported as a geometric mean of the estimated average response ratio and 95% confidence interval. Overall analysis of studies reported differences in mtDNA-cn in blood samples (k = 10) and non-blood samples (brain tissues and oral samples; k = 4) suggested significantly higher mtDNA-cn in patients compared to controls (p = 0.0275). Sub-analysis by stratifying studies based on tissue type, showed no significant increase in mtDNA-cn in blood samples among patients and controls (p = 0.284). Conversely, higher mtDNA-cn was observed in non-blood samples in patients than in controls (p = 0.0122). Further stratified analysis based on blood-cell compositions as potential confounds showed no significant difference in mtDNA-cn in peripheral blood samples of patients comparted to controls (p = 0.074). In addition, stratified analysis of aged-matched ASD and ADHD patients and controls revealed no significant difference in mtDNA-cn in blood samples between patients and controls (p = 0.214), whereas a significant increase in mtDNA-cn was observed in non-blood samples between patients and controls (p < 0.001). Finally, when the mtDNA-cn was analyzed in blood samples of aged-matched patients with ASD (peripheral blood, leukocytes, and PBMCs) or ADHD (peripheral blood), no significant difference in mtDNA-cn was observed between ASD patients and controls (p = 0.385), while a significant increase in mtDNA-cn was found between ADHD patients and controls (p = 0.033). Conclusion In this first meta-analysis of the evaluation of mtDNA-cn in ASD/ADHD, our results show elevated mtDNA-cn in ASD and ADHD, further emphasizing the implication of mitochondrial dysfunction in neurodevelopmental disorders. However, our results indicate that the mtDNA-cn in blood is not reflected in other tissues in ASD/ADHD, and the true relationship between blood-derived mtDNA-cn and ASD/ADHD remains to be defined in future studies. The importance of blood-cell compositions as confounders of blood-based mtDNA-cn measurement and the advantages of salivary mtDNA-cn should be considered in future studies. Moreover, the potential of mtDNA-cn as a biomarker for mitochondrial malfunction in neurodevelopmental disorders deserves further investigations.
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Affiliation(s)
- Ghada Al-Kafaji
- Department of Molecular Medicine and Al-Jawhara Centre for Molecular Medicine, Genetics, and Inherited Disorders, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Bahrain
| | - Haitham Ali Jahrami
- Department of Psychiatry, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Bahrain
- Government Hospital, Manama, Bahrain
| | - Materah Salem Alwehaidah
- Department of Medical Laboratory, Faculty of Allied Health, Kuwait University, Kuwait City, Kuwait
| | | | - Mariwan Husni
- Department of Psychiatry, College of Medicine and Medical Sciences, Arabian Gulf University, Manama, Bahrain
- Department of Psychiatry, Northern Ontarion School of Medicine University, Thunder Bay, ON, Canada
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Ricci CA, Reid DM, Sun J, Santillan DA, Santillan MK, Phillips NR, Goulopoulou S. Maternal and fetal mitochondrial gene dysregulation in hypertensive disorders of pregnancy. Physiol Genomics 2023; 55:275-285. [PMID: 37184228 PMCID: PMC10292966 DOI: 10.1152/physiolgenomics.00005.2023] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 05/04/2023] [Accepted: 05/08/2023] [Indexed: 05/16/2023] Open
Abstract
Mitochondrial dysfunction has been implicated in pregnancy-induced hypertension (PIH). The role of mitochondrial gene dysregulation in PIH, and consequences for maternal-fetal interactions, remain elusive. Here, we investigated mitochondrial gene expression and dysregulation in maternal and placental tissues from pregnancies with and without PIH; further, we measured circulating mitochondrial DNA (mtDNA) mutational load, an index of mtDNA integrity. Differential gene expression analysis followed by Time Course Gene Set Analysis (TcGSA) was conducted on publicly available high throughput sequencing transcriptomic data sets. Mutational load analysis was carried out on peripheral mononuclear blood cells from healthy pregnant individuals and individuals with preeclampsia. Thirty mitochondrial differentially expressed genes (mtDEGs) were detected in the maternal cell-free circulating transcriptome, whereas nine were detected in placental transcriptome from pregnancies with PIH. In PIH pregnancies, maternal mitochondrial dysregulation was associated with pathways involved in inflammation, cell death/survival, and placental development, whereas fetal mitochondrial dysregulation was associated with increased production of extracellular vesicles (EVs) at term. Mothers with preeclampsia did not exhibit a significantly different degree of mtDNA mutational load. Our findings support the involvement of maternal mitochondrial dysregulation in the pathophysiology of PIH and suggest that mitochondria may mediate maternal-fetal interactions during healthy pregnancy.NEW & NOTEWORTHY This study identifies aberrant maternal and fetal expression of mitochondrial genes in pregnancies with gestational hypertension and preeclampsia. Mitochondrial gene dysregulation may be a common etiological factor contributing to the development of de novo hypertension in pregnancy-associated hypertensive disorders.
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Affiliation(s)
- Contessa A Ricci
- Department of Physiology and Anatomy, University of North Texas Health Science Center, Fort Worth, Texas, United States
| | - Danielle M Reid
- Department of Microbiology, Immunology and Genetics, University of North Texas Health Science Center, Fort Worth, Texas, United States
| | - Jie Sun
- Department of Microbiology, Immunology and Genetics, University of North Texas Health Science Center, Fort Worth, Texas, United States
| | - Donna A Santillan
- Department of Obstetrics and Gynecology, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States
| | - Mark K Santillan
- Department of Obstetrics and Gynecology, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States
| | - Nicole R Phillips
- Department of Microbiology, Immunology and Genetics, University of North Texas Health Science Center, Fort Worth, Texas, United States
| | - Styliani Goulopoulou
- Department of Physiology and Anatomy, University of North Texas Health Science Center, Fort Worth, Texas, United States
- Department of Gynecology and Obstetrics, Lawrence D. Longo MD Center for Perinatal Biology, Loma Linda University School of Medicine, Loma Linda, California, United States
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Vallbona-Garcia A, Hamers IHJ, van Tienen FHJ, Ochoteco-Asensio J, Berendschot TTJM, de Coo IFM, Benedikter BJ, Webers CAB, Smeets HJM, Gorgels TGMF. Low mitochondrial DNA copy number in buffy coat DNA of primary open-angle glaucoma patients. Exp Eye Res 2023; 232:109500. [PMID: 37178956 DOI: 10.1016/j.exer.2023.109500] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 04/22/2023] [Accepted: 05/09/2023] [Indexed: 05/15/2023]
Abstract
Primary open-angle glaucoma (POAG) is characterized by optic nerve degeneration and irreversible loss of retinal ganglion cells (RGCs). The pathophysiology is not fully understood. Since RGCs have a high energy demand, suboptimal mitochondrial function may put the survival of these neurons at risk. In the present study, we explored whether mtDNA copy number or mtDNA deletions could reveal a mitochondrial component in POAG pathophysiology. Buffy coat DNA was isolated from EDTA blood of age- and sex-matched study groups, namely POAG patients with high intraocular pressure (IOP) at diagnosis (high tension glaucoma: HTG; n = 97), normal tension glaucoma patients (NTG, n = 37), ocular hypertensive controls (n = 9), and cataract controls (without glaucoma; n = 32), all without remarkable comorbidities. The number of mtDNA copies was assessed through qPCR quantification of the mitochondrial D-loop and nuclear B2M gene. Presence of the common 4977 base pair mtDNA deletion was assessed by a highly sensitive breakpoint PCR. Analysis showed that HTG patients had a lower number of mtDNA copies per nuclear DNA than NTG patients (p-value <0.01, Dunn test) and controls (p-value <0.001, Dunn test). The common 4977 base pair mtDNA deletion was not detected in any of the participants. A lower mtDNA copy number in blood of HTG patients suggests a role for a genetically defined, deficient mtDNA replication in the pathology of HTG. This may cause a low number of mtDNA copies in RGCs, which together with aging and high IOP, may lead to mitochondrial dysfunction, and contribute to glaucoma pathology.
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Affiliation(s)
- Antoni Vallbona-Garcia
- University Eye Clinic Maastricht, Maastricht University Medical Center+, Maastricht, the Netherlands; Department of Toxicogenomics, Maastricht University, Maastricht, the Netherlands; School for Mental Health and Neuroscience, Maastricht University, Maastricht, the Netherlands.
| | - Ilse H J Hamers
- Department of Toxicogenomics, Maastricht University, Maastricht, the Netherlands
| | - Florence H J van Tienen
- Department of Toxicogenomics, Maastricht University, Maastricht, the Netherlands; School for Mental Health and Neuroscience, Maastricht University, Maastricht, the Netherlands
| | | | - Tos T J M Berendschot
- University Eye Clinic Maastricht, Maastricht University Medical Center+, Maastricht, the Netherlands
| | - Irenaeus F M de Coo
- Department of Toxicogenomics, Maastricht University, Maastricht, the Netherlands
| | - Birke J Benedikter
- University Eye Clinic Maastricht, Maastricht University Medical Center+, Maastricht, the Netherlands; School for Mental Health and Neuroscience, Maastricht University, Maastricht, the Netherlands
| | - Carroll A B Webers
- University Eye Clinic Maastricht, Maastricht University Medical Center+, Maastricht, the Netherlands
| | - Hubert J M Smeets
- Department of Toxicogenomics, Maastricht University, Maastricht, the Netherlands; School for Mental Health and Neuroscience, Maastricht University, Maastricht, the Netherlands
| | - Theo G M F Gorgels
- University Eye Clinic Maastricht, Maastricht University Medical Center+, Maastricht, the Netherlands; School for Mental Health and Neuroscience, Maastricht University, Maastricht, the Netherlands
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Linke C, Hunger R, Reinwald M, Deckert M, Mantke R. Quantification of mitochondrial cfDNA reveals new perspectives for early diagnosis of colorectal cancer. BMC Cancer 2023; 23:291. [PMID: 36997875 PMCID: PMC10064655 DOI: 10.1186/s12885-023-10748-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 03/16/2023] [Indexed: 04/01/2023] Open
Abstract
BACKGROUND To unravel how the integrity of nuclear and mitochondrial circulating cell-free DNA (cfDNA) contributes to its plasma quantity in colorectal cancer (CRC) patients. METHODS CfDNA from plasma samples of 80 CRC patients stratified by tumour stage and 50 healthy individuals were extracted. Total cfDNA concentration was determined and equal template concentrations (ETC) were analyzed by quantitative real-time PCR (qPCR) resulting in small and long fragments of KRAS, Alu and MTCO3. The obtained data was also examined relative to the total cfDNA concentration (NTC) and diagnostic accuracy was estimated using receiver operating characteristics. RESULTS Total cfDNA levels were significantly higher in CRC group compared to healthy control and increased with tumour stage. Long nuclear fragment levels were significantly lower in CRC patients in ETC but not NTC condition. The integrity indices of nuclear cfDNA decreased from controls to patients with highly malignant tumor. Mitochondrial cfDNA fragment quantities were strongly reduced in early and late stages of tumor patients and prognostic value was higher in ETC. Predictive models based on either ETC or NTC predictor set showed comparable classification performance. CONCLUSION Increased blood cfDNA concentration in late UICC stages inversely correlate with nuclear cfDNA integrity index and suggest that necrotic degradation is not a major cause for higher total cfDNA quantity. The diagnostic and prognostic value of MTCO3 is highly significant in early stages of CRC and can be evaluated more comprehensively, using ETC for qPCR analysis. TRIAL REGISTRATION The study was registered retrospectively on DRKS, the german register for clinical trials (DRKS00030257, 29/09/2022).
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Affiliation(s)
- Christian Linke
- Department of General and Gastrointestinal Surgery, University Hospital Brandenburg, Brandenburg Medical School Theodor Fontane, Brandenburg, Germany.
- Department of Hematology, Oncology and Palliative Medicine, University Hospital Brandenburg, Brandenburg Medical School Theodor Fontane, Brandenburg, Germany.
- Faculty of Health Sciences, Joint Faculty of the Brandenburg University of Technology Cottbus - Senftenberg, the Brandenburg Medical School Theodor Fontane and the University of Potsdam, Potsdam, Germany.
| | - Richard Hunger
- Department of General and Gastrointestinal Surgery, University Hospital Brandenburg, Brandenburg Medical School Theodor Fontane, Brandenburg, Germany
| | - Mark Reinwald
- Department of Hematology, Oncology and Palliative Medicine, University Hospital Brandenburg, Brandenburg Medical School Theodor Fontane, Brandenburg, Germany
- Faculty of Health Sciences, Joint Faculty of the Brandenburg University of Technology Cottbus - Senftenberg, the Brandenburg Medical School Theodor Fontane and the University of Potsdam, Potsdam, Germany
| | - Markus Deckert
- Department of Hematology, Oncology and Palliative Medicine, University Hospital Brandenburg, Brandenburg Medical School Theodor Fontane, Brandenburg, Germany
- Faculty of Health Sciences, Joint Faculty of the Brandenburg University of Technology Cottbus - Senftenberg, the Brandenburg Medical School Theodor Fontane and the University of Potsdam, Potsdam, Germany
| | - René Mantke
- Department of General and Gastrointestinal Surgery, University Hospital Brandenburg, Brandenburg Medical School Theodor Fontane, Brandenburg, Germany
- Faculty of Health Sciences, Joint Faculty of the Brandenburg University of Technology Cottbus - Senftenberg, the Brandenburg Medical School Theodor Fontane and the University of Potsdam, Potsdam, Germany
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Reid DM, Barber RC, Jones HP, Thorpe RJ, Sun J, Zhou Z, Phillips NR. Integrative Blood-Based Characterization of Oxidative Mitochondrial DNA Damage Variants Implicates Mexican Americans' Metabolic Risk for Developing Alzheimer's Disease. RESEARCH SQUARE 2023:rs.3.rs-2666242. [PMID: 36993752 PMCID: PMC10055654 DOI: 10.21203/rs.3.rs-2666242/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
Alzheimer's Disease (AD) continues to be a leading cause of death in the US. As the US aging population (ages 65+) expands, the impact will disproportionately affect vulnerable populations, e.g., Hispanic/Latinx population, due to their AD-related health disparities. Age-related regression in mitochondrial activity and ethnic-specific differences in metabolic burden could potentially explain in part the racial/ethnic distinctions in etiology that exist for AD. Oxidation of guanine (G) to 8-oxo-guanine (8oxoG) is a prevalent lesion and an indicator of oxidative stress and mitochondrial dysfunction. Damaged mtDNA (8oxoG) can serve as an important marker of age-related systemic metabolic dysfunction and upon release into peripheral circulation may exacerbate pathophysiology contributing to AD development and/or progression. Analyzing blood samples from Mexican American (MA) and non-Hispanic White (NHW) participants enrolled in the Texas Alzheimer's Research & Care Consortium, we used blood-based measurements of 8oxoG from both buffy coat PBMCs and plasma to determine associations with population, sex, type-2 diabetes, and AD risk. Our results show that 8oxoG levels in both buffy coat and plasma were significantly associated with population, sex, years of education, and reveal a potential association with AD. Furthermore, MAs are significantly burdened by mtDNA oxidative damage in both blood fractions, which may contribute to their metabolic vulnerability to developing AD.
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Affiliation(s)
| | | | | | - Roland J Thorpe
- Johns Hopkins Center for Health Disparities Solutions, Johns Hopkins Bloomberg School of Public Health
| | - Jie Sun
- University of North Texas Health Science Center
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Chen J, Zheng Q, Hicks JL, Trabzonlu L, Ozbek B, Jones T, Vaghasia A, Larman TC, Wang R, Markowski MC, Denmeade SR, Pienta KJ, Hruban RH, Antonarakis ES, Gupta A, Dang CV, Yegnasubramanian S, De Marzo AM. MYC-driven increases in mitochondrial DNA copy number occur early and persist throughout prostatic cancer progression. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.02.20.529259. [PMID: 36865273 PMCID: PMC9979994 DOI: 10.1101/2023.02.20.529259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Increased mitochondrial function may render some cancers vulnerable to mitochondrial inhibitors. Since mitochondrial function is regulated partly by mitochondrial DNA copy number (mtDNAcn), accurate measurements of mtDNAcn could help reveal which cancers are driven by increased mitochondrial function and may be candidates for mitochondrial inhibition. However, prior studies have employed bulk macrodissections that fail to account for cell type-specific or tumor cell heterogeneity in mtDNAcn. These studies have often produced unclear results, particularly in prostate cancer. Herein, we developed a multiplex in situ method to spatially quantify cell type specific mtDNAcn. We show that mtDNAcn is increased in luminal cells of high-grade prostatic intraepithelial neoplasia (HGPIN), is increased in prostatic adenocarcinomas (PCa), and is further elevated in metastatic castration-resistant prostate cancer. Increased PCa mtDNAcn was validated by two orthogonal methods and is accompanied by increases in mtRNAs and enzymatic activity. Mechanistically, MYC inhibition in prostate cancer cells decreases mtDNA replication and expression of several mtDNA replication genes, and MYC activation in the mouse prostate leads to increased mtDNA levels in the neoplastic prostate cells. Our in situ approach also revealed elevated mtDNAcn in precancerous lesions of the pancreas and colon/rectum, demonstrating generalization across cancer types using clinical tissue samples.
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Affiliation(s)
- Jiayu Chen
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Qizhi Zheng
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Jessica L. Hicks
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Levent Trabzonlu
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Busra Ozbek
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Tracy Jones
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Ajay Vaghasia
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Tatianna C. Larman
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Rulin Wang
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Mark C. Markowski
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Sam R. Denmeade
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Urology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Kenneth J. Pienta
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Urology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Ralph H. Hruban
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- The Sol Goldman Pancreatic Cancer Research Center, Johns Hopkins Medicine, Baltimore, Maryland, USA
| | - Emmanuel S. Antonarakis
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Urology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Anuj Gupta
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Chi V Dang
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Biochemistry and Molecular Biology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Srinivasan Yegnasubramanian
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Angelo M. De Marzo
- Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
- Department of Urology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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42
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Xu X, Chang CW, Li M, Omabe K, Le N, Chen YH, Liang F, Liu Y. DNA replication initiation factor RECQ4 possesses a role in antagonizing DNA replication initiation. Nat Commun 2023; 14:1233. [PMID: 36871012 PMCID: PMC9985596 DOI: 10.1038/s41467-023-36968-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Accepted: 02/27/2023] [Indexed: 03/06/2023] Open
Abstract
Deletion of the conserved C-terminus of the Rothmund-Thomson syndrome helicase RECQ4 is highly tumorigenic. However, while the RECQ4 N-terminus is known to facilitate DNA replication initiation, the function of its C-terminus remains unclear. Using an unbiased proteomic approach, we identify an interaction between the RECQ4 N-terminus and the anaphase-promoting complex/cyclosome (APC/C) on human chromatin. We further show that this interaction stabilizes APC/C co-activator CDH1 and enhances APC/C-dependent degradation of the replication inhibitor Geminin, allowing replication factors to accumulate on chromatin. In contrast, the function is blocked by the RECQ4 C-terminus, which binds to protein inhibitors of APC/C. A cancer-prone, C-terminal-deleted RECQ4 mutation increases origin firing frequency, accelerates G1/S transition, and supports abnormally high DNA content. Our study reveals a role of the human RECQ4 C-terminus in antagonizing its N-terminus, thereby suppressing replication initiation, and this suppression is impaired by oncogenic mutations.
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Affiliation(s)
- Xiaohua Xu
- Thermo Fisher Scientific, 5781 Van Allen Way, Carlsbad, CA, 92008, USA
| | - Chou-Wei Chang
- Vesigen Therapeutics, 790 Memorial Drive, Suite 103, Cambridge, MA, 02139, USA
| | - Min Li
- Department of Cancer Genetics and Epigenetics, Beckman Research Institute, City of Hope, Duarte, CA, 91010-3000, USA
| | - Kenneth Omabe
- Department of Cancer Genetics and Epigenetics, Beckman Research Institute, City of Hope, Duarte, CA, 91010-3000, USA
| | - Nhung Le
- Department of Cancer Genetics and Epigenetics, Beckman Research Institute, City of Hope, Duarte, CA, 91010-3000, USA
| | - Yi-Hsuan Chen
- Department of Computer Science, University of Southern California, Los Angeles, CA, 90089, USA
| | - Feng Liang
- Neuroscience Graduate Program, University of Southern California, Los Angeles, CA, 90089, USA
| | - Yilun Liu
- Department of Cancer Genetics and Epigenetics, Beckman Research Institute, City of Hope, Duarte, CA, 91010-3000, USA.
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Sex-related difference of association of mitochondrial DNA copy number with PTSD in U.S. service members. J Psychiatr Res 2023; 159:1-5. [PMID: 36652751 DOI: 10.1016/j.jpsychires.2023.01.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 12/27/2022] [Accepted: 01/04/2023] [Indexed: 01/07/2023]
Abstract
Gender differences in the lifetime prevalence of post-traumatic stress disorder (PTSD) have been well described with rates reported as approximately 10%-12% in females and 5%-6% in males (Olff, 2017). This study examined whether the sex-related difference of mitochondrial DNA copy number (mtDNAcn), an emerging systemic index of mitochondrial biogenesis and function can serve as a potential biomarker for PTSD. Leukocyte mtDNAcn of service members with PTSD (male = 127, female = 24) or without PTSD (male = 621, female = 78) was assessed using a TaqMan assay. The results were validated by the absolute quantification of QX-200 droplet digital PCR (ddPCR). PTSD symptoms and symptom severity were assessed using the PTSD Checklist (PCL), a 17-item, DSM-based, self-report questionnaire with well-established validity and reliability. DSM-IV criteria and PTSD were determined by PCL total score. We found that mtDNAcn of female subjects with PTSD was significantly higher compared to either male or female non-PTSD controls or male subjects with PTSD (p < 0.05). There was no significant difference in mtDNAcn between males with PTSD and male/female controls without PTSD. Using in vitro cultured SH-SY5Y cells (human neuroblastoma), we demonstrated that estrogen (Estro) treatment significantly decreased mtDNAcn (P < 0.001) compared to the vehicle control. We also found that pre-treatment with either synthetic glucocorticoid dexamethasone (Dex) or Estro blocker tamoxifen (Tamox) attenuated the estrogen-induced decreases of mtDNAcn. Our data suggest that mtDNAcn may be gender-dependent in the Servicemembers with PTSD. Glucocorticoid and/or estrogen receptors may play a role in the regulation of mtDNAcn. The sex-related difference of mtDNAcn may serve as a PTSD biomarker for females.
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Zhang L, Ma J, Shen Z, Wang B, Jiang Q, Ma F, Ju Y, Duan G, Zhang Q, Su X. Low copy numbers for mitochondrial DNA moderates the strength of nuclear-cytoplasmic incompatibility in plants. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2023; 65:739-754. [PMID: 36308719 DOI: 10.1111/jipb.13400] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 10/27/2022] [Indexed: 06/16/2023]
Abstract
Plant cells contain only small amounts of mitochondrial DNA (mtDNA), with the genomic information shared among multiple mitochondria. The biological relevance and molecular mechanism underlying this hallmark of plant cells has been unclear. Here, we report that Arabidopsis thaliana plants exhibited significantly reduced growth and mitochondrial dysfunction when the mtDNA copy number was increased to the degree that each mitochondrion possessed DNA. The amounts of mitochondrion-encoded transcripts increased several fold in the presence of elevated mtDNA levels. However, the efficiency of RNA editing decreased with this excess of mitochondrion-encoded transcripts, resulting in impaired assembly of mitochondrial complexes containing mtDNA-encoded subunits, such as respiratory complexes I and IV. These observations indicate the occurrence of nuclear-mitochondrial incompatibility in the cells with increased amounts of mtDNA and provide an initial answer to the fundamental question of why plant cells have much lower mtDNA levels than animal cells. We propose that keeping mtDNA levels low moderates nuclear-mitochondrial incompatibility and that this may be a crucial factor driving plant cells to restrict the copy numbers of mtDNA.
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Affiliation(s)
- Liguang Zhang
- Key Laboratory of Ministry of Education for Cell Proliferation and Differentiation, College of Life Sciences, Peking University, Beijing, 100871, China
| | - Jin Ma
- Key Laboratory of Ministry of Education for Cell Proliferation and Differentiation, College of Life Sciences, Peking University, Beijing, 100871, China
| | - Zhaorui Shen
- Key Laboratory of Ministry of Education for Cell Proliferation and Differentiation, College of Life Sciences, Peking University, Beijing, 100871, China
| | - Bo Wang
- State Key Laboratory of Protein and Plant Gene Research and Biomedical Pioneering Innovation Center (BIOPIC), College of Life Sciences, Peking University, Beijing, 100871, China
| | - Qingling Jiang
- Key Laboratory of Ministry of Education for Cell Proliferation and Differentiation, College of Life Sciences, Peking University, Beijing, 100871, China
| | - Fei Ma
- Key Laboratory of Ministry of Education for Cell Proliferation and Differentiation, College of Life Sciences, Peking University, Beijing, 100871, China
| | - Yan Ju
- Key Laboratory of Ministry of Education for Cell Proliferation and Differentiation, College of Life Sciences, Peking University, Beijing, 100871, China
| | - Guangxing Duan
- Key Laboratory of Ministry of Education for Cell Proliferation and Differentiation, College of Life Sciences, Peking University, Beijing, 100871, China
| | - Quan Zhang
- Key Laboratory of Ministry of Education for Cell Proliferation and Differentiation, College of Life Sciences, Peking University, Beijing, 100871, China
| | - Xiaodong Su
- State Key Laboratory of Protein and Plant Gene Research and Biomedical Pioneering Innovation Center (BIOPIC), College of Life Sciences, Peking University, Beijing, 100871, China
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Kawalec M, Wojtyniak P, Bielska E, Lewczuk A, Boratyńska-Jasińska A, Beręsewicz-Haller M, Frontczak-Baniewicz M, Gewartowska M, Zabłocka B. Mitochondrial dynamics, elimination and biogenesis during post-ischemic recovery in ischemia-resistant and ischemia-vulnerable gerbil hippocampal regions. Biochim Biophys Acta Mol Basis Dis 2023; 1869:166633. [PMID: 36566873 DOI: 10.1016/j.bbadis.2022.166633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 12/14/2022] [Accepted: 12/16/2022] [Indexed: 12/24/2022]
Abstract
Transient ischemic attacks (TIA) result from a temporary blockage in blood circulation in the brain. As TIAs cause disabilities and often precede full-scale strokes, the effects of TIA are investigated to develop neuroprotective therapies. We analyzed changes in mitochondrial network dynamics, mitophagy and biogenesis in sections of gerbil hippocampus characterized by a different neuronal survival rate after 5-minute ischemia-reperfusion (I/R) insult. Our research revealed a significantly greater mtDNA/nDNA ratio in CA2-3, DG hippocampal regions (5.8 ± 1.4 vs 3.6 ± 0.8 in CA1) that corresponded to a neuronal resistance to I/R. During reperfusion, an increase of pro-fission (phospho-Ser616-Drp1/Drp1) and pro-fusion proteins (1.6 ± 0.5 and 1.4 ± 0.3 for Mfn2 and Opa1, respectively) was observed in CA2-3, DG. Selective autophagy markers, PINK1 and SQSTM1/p62, were elevated 24-96 h after I/R and accompanied by significant elevation of transcription factors proteins PGC-1α and Nrf1 (1.2 ± 0.4, 1.78 ± 0.6, respectively) and increased respiratory chain proteins (e.g., 1.5 ± 0.3 for complex IV at I/R 96 h). Contrastingly, decreased enzymatic activity of citrate synthase, reduced Hsp60 protein level and electron transport chain subunits (0.88 ± 0.03, 0.74 ± 0.1 and 0.71 ± 0.1 for complex IV at I/R 96 h, respectively) were observed in I/R-vulnerable CA1. The phospho-Ser616-Drp1/Drp1 was increased while Mfn2 and total Opa1 reduced to 0.88 ± 0.1 and 0.77 ± 0.17, respectively. General autophagy, measured as LC3-II/I ratio, was activated 3 h after reperfusion reaching 2.37 ± 0.9 of control. This study demonstrated that enhanced mitochondrial fusion, followed by late and selective mitophagy and mitochondrial biogenesis might together contribute to reduced susceptibility to TIA.
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Affiliation(s)
- Maria Kawalec
- Molecular Biology Unit, Mossakowski Medical Research Institute, Polish Academy of Sciences, Warsaw, Poland.
| | - Piotr Wojtyniak
- Molecular Biology Unit, Mossakowski Medical Research Institute, Polish Academy of Sciences, Warsaw, Poland
| | - Ewelina Bielska
- Molecular Biology Unit, Mossakowski Medical Research Institute, Polish Academy of Sciences, Warsaw, Poland
| | - Anita Lewczuk
- Molecular Biology Unit, Mossakowski Medical Research Institute, Polish Academy of Sciences, Warsaw, Poland
| | - Anna Boratyńska-Jasińska
- Molecular Biology Unit, Mossakowski Medical Research Institute, Polish Academy of Sciences, Warsaw, Poland
| | | | | | - Magdalena Gewartowska
- Electron Microscopy Research Unit, Mossakowski Medical Research Institute, Polish Academy of Sciences, Warsaw, Poland
| | - Barbara Zabłocka
- Molecular Biology Unit, Mossakowski Medical Research Institute, Polish Academy of Sciences, Warsaw, Poland
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Wang J, Liang H, Wang Y, Zheng X, Chen F, Shao J, Geng Z, Zheng L, Yang W, Weng J, Xu T, Zhou K. Mitochondrial DNA Copy Number Is a Potential Biomarker for Treatment Choice Between Metformin and Acarbose. Clin Pharmacol Ther 2023; 113:1268-1273. [PMID: 36841964 DOI: 10.1002/cpt.2877] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 02/08/2023] [Indexed: 02/27/2023]
Abstract
Metformin is the first-line drug for type 2 diabetes (T2D) while acarbose is suggested as a viable alternative in Chinese patients with newly diagnosed T2D. However, few biomarkers have been established to guide the choice between these two agents. Mitochondrial DNA (mtDNA) copy number (mtDNA-CN) is a biomarker of mitochondrial function, which is associated with various metabolic outcomes. Using data from the trial of Metformin and Acarbose in Chinese as the Initial Hypoglycaemic Treatment (MARCH) (metformin n = 214; acarbose n = 198), we examined whether mtDNA-CN was associated with response to the drugs in terms of glycemic response and β-cell function protection response. The glycemic response is defined as the maximum glucose reduction of glycated hemoglobin A1c , fasting plasma glucose, or postprandial blood glucose during 48 weeks. β-cell function protection response is defined as the maximum increment of insulinogenic index (IGI) or disposition index (DI). For all three glycemic responses, mtDNA-CN was not significantly associated with either metformin or acarbose. Importantly, for β-cell function protection response, we found the increased mtDNA-CN was significantly associated with more IGI increment (beta: 0.84; 95% confidence interval (CI), 0.02 to 1.66) in the metformin group, but less IGI increment (beta: -1.38; 95% CI, -2.52 to -0.23) in the acarbose group. A significant interaction (P = 0.008) between mtDNA-CN and the treatment group was observed. Consistent results were also obtained when DI increment was used as a measure of β-cell function response. This study demonstrated the potential application of mtDNA-CN in guiding the treatment choice between metformin and acarbose based on β-cell protection.
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Affiliation(s)
- Jing Wang
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Hua Liang
- Department of Endocrinology and Metabolism, Shunde Hospital of Southern Medical University (The First People's Hospital of Shunde), Foshan, China
| | - You Wang
- Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Xueying Zheng
- Department of Endocrinology of the First Affiliated Hospital, Division of Life Sciences and Medicine, University of Science and Technology of China, Anhui, Hefei, China
| | - Fei Chen
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
| | - Jian Shao
- Guangzhou Laboratory, Guangzhou International Bio Island, Guangzhou, China
| | - Zhaoxu Geng
- Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Li Zheng
- Institute of Biophysics, Chinese Academy of Sciences, Beijing, China
| | - Wenying Yang
- Department of Endocrinology, China-Japan Friendship Hospital, Beijing, China
| | - Jianping Weng
- Department of Endocrinology of the First Affiliated Hospital, Division of Life Sciences and Medicine, University of Science and Technology of China, Anhui, Hefei, China
| | - Tao Xu
- Institute of Biophysics, Chinese Academy of Sciences, Beijing, China.,Guangzhou Laboratory, Guangzhou International Bio Island, Guangzhou, China
| | - Kaixin Zhou
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing, China
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47
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Xie X, Zhu X. Visualization of mtDNA Using FISH. Methods Mol Biol 2023; 2615:89-98. [PMID: 36807786 DOI: 10.1007/978-1-0716-2922-2_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Proper mitochondrial DNA (mtDNA) levels are critical for many cellular biological functions and are associated with aging and many mitochondria disorders. Defects in core subunits of the mtDNA replication machinery lead to decreased mtDNA levels. Other indirect mitochondrial contexts including ATP concentration, lipid composition, and nucleotide composition also contribute to mtDNA maintenance. Furthermore, mtDNA molecules are distributed evenly throughout the mitochondrial network. This uniform distribution pattern is required for oxidative phosphorylation and ATP production and has been linked to many diseases when perturbed. Thus, it is important to visualize mtDNA in the cellular context. Here we provide detailed protocols for cellular visualization of mtDNA using fluorescence in situ hybridization (FISH). The fluorescent signals are targeted to the mtDNA sequence directly, ensuring both sensitivity and specificity. This mtDNA FISH method can be combined with immunostaining and used for visualizing mtDNA-protein interactions and dynamics.
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Affiliation(s)
- Xie Xie
- Department of Medical Biochemistry and Cell Biology, University of Gothenburg, Gothenburg, Sweden
| | - Xuefeng Zhu
- Department of Medical Biochemistry and Cell Biology, University of Gothenburg, Gothenburg, Sweden.
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48
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Bandaru LJM, Murumulla L, C BL, D KP, Challa S. Exposure of combination of environmental pollutant, lead (Pb) and β-amyloid peptides causes mitochondrial dysfunction and oxidative stress in human neuronal cells. J Bioenerg Biomembr 2023; 55:79-89. [PMID: 36637735 DOI: 10.1007/s10863-023-09956-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 01/06/2023] [Indexed: 01/14/2023]
Abstract
Exposure to the environmental pollutant lead (Pb) has been linked to Alzheimer's disease (AD), in which mitochondrial dysfunction is a pathological consequence of neuronal degeneration. The toxicity of Pb in combination with β-amyloid peptides (1-40) and (25-35) causes selective death in neuronal cells. However, the precise mechanism through which Pb induces Alzheimer's disease, particularly mitochondrial damage, is unknown. Changes in mitochondrial mass, membrane potential, mitochondrial complex activities, mitochondrial DNA and oxidative stress were examined in neuronal cells of human origin exposed to Pb and β-amyloid peptides (1-40) and (25-35) individually and in different combinations. The results showed depolarization of mitochondrial membrane potential, decrease in mitochondrial mass, ATP levels and mtDNA copy number in Pb and β-amyloid peptides (1-40) and (25-35) exposed cells. Also, significant reductions in the expression of mitochondrial electron transport chain (ETC) complex proteins (ATP5A, COXIV, UQCRC2, SDHB, NDUFS3), as well as down regulation of ETC complex gene expressions such as COXIV, ATP5F1 and NDUFS3 and antioxidant gene expressions like MnSOD and Gpx4 were observed in exposed cells. Furthermore, Pb and β-amyloid peptides exposure resulted in elevated mitochondrial malondialdehyde levels and a decrease in mitochondrial GSH levels. Our findings suggest that Pb toxicity could be one of the causative factors for the mitochondrial dysfunction and oxidative stress in Alzheimer's disease progression.
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Affiliation(s)
- Lakshmi Jaya Madhuri Bandaru
- Cell Biology Division, National Institute of Nutrition, Indian Council of Medical Research (ICMR), Hyderabad, Telangana, 500007, India
| | - Lokesh Murumulla
- Cell Biology Division, National Institute of Nutrition, Indian Council of Medical Research (ICMR), Hyderabad, Telangana, 500007, India
| | - Bindu Lasya C
- Department of Pharmacology, Anurag University, Hyderabad, India
| | | | - Suresh Challa
- Cell Biology Division, National Institute of Nutrition, Indian Council of Medical Research (ICMR), Hyderabad, Telangana, 500007, India.
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49
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Mirza S, Bhadresha K, Mughal MJ, McCabe M, Shahbazi R, Ruff P, Penny C. Liquid biopsy approaches and immunotherapy in colorectal cancer for precision medicine: Are we there yet? Front Oncol 2023; 12:1023565. [PMID: 36686736 PMCID: PMC9853908 DOI: 10.3389/fonc.2022.1023565] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2022] [Accepted: 12/08/2022] [Indexed: 01/07/2023] Open
Abstract
Colorectal cancer (CRC) is the second leading cause of cancer-related deaths globally, with nearly half of patients detected in the advanced stages. This is due to the fact that symptoms associated with CRC often do not appear until the cancer has reached an advanced stage. This suggests that CRC is a cancer with a slow progression, making it curable and preventive if detected in its early stage. Therefore, there is an urgent clinical need to improve CRC early detection and personalize therapy for patients with this cancer. Recently, liquid biopsy as a non-invasive or nominally invasive approach has attracted considerable interest for its real-time disease monitoring capability through repeated sample analysis. Several studies in CRC have revealed the potential for liquid biopsy application in a real clinical setting using circulating RNA/miRNA, circulating tumor cells (CTCs), exosomes, etc. However, Liquid biopsy still remains a challenge since there are currently no promising results with high specificity and specificity that might be employed as optimal circulatory biomarkers. Therefore, in this review, we conferred the plausible role of less explored liquid biopsy components like mitochondrial DNA (mtDNA), organoid model of CTCs, and circulating cancer-associated fibroblasts (cCAFs); which may allow researchers to develop improved strategies to unravel unfulfilled clinical requirements in CRC patients. Moreover, we have also discussed immunotherapy approaches to improve the prognosis of MSI (Microsatellite Instability) CRC patients using neoantigens and immune cells in the tumor microenvironment (TME) as a liquid biopsy approach in detail.
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Affiliation(s)
- Sheefa Mirza
- Department of Internal Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa,Department of Internal Medicine, Common Epithelial Cancer Research Centre, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Kinjal Bhadresha
- Hematology/Oncology Division, School of Medicine, Indiana University, Indianapolis, IN, United States
| | - Muhammed Jameel Mughal
- Department of Biochemistry and Molecular Medicine, School of Medicine and Health Science, The George Washington University, Washington, DC, United States
| | - Michelle McCabe
- Department of Anatomical Pathology, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Parktown, Johannesburg, South Africa
| | - Reza Shahbazi
- Hematology/Oncology Division, School of Medicine, Indiana University, Indianapolis, IN, United States
| | - Paul Ruff
- Department of Internal Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa,Department of Internal Medicine, Common Epithelial Cancer Research Centre, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa
| | - Clement Penny
- Department of Internal Medicine, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa,Department of Internal Medicine, Common Epithelial Cancer Research Centre, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa,*Correspondence: Clement Penny,
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50
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Van Der Stukken C, Nawrot TS, Wang C, Lefebvre W, Vanpoucke C, Plusquin M, Roels HA, Janssen BG, Martens DS. The association between ambient particulate matter exposure and the telomere-mitochondrial axis of aging in newborns. ENVIRONMENT INTERNATIONAL 2023; 171:107695. [PMID: 36574746 DOI: 10.1016/j.envint.2022.107695] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 12/09/2022] [Accepted: 12/13/2022] [Indexed: 06/17/2023]
Abstract
BACKGROUND Particulate matter (PM) is associated with aging markers at birth, including telomeres and mitochondria. It is unclear whether markers of the core-axis of aging, i.e. tumor suppressor p53 (p53) and peroxisome proliferator-activated receptor gamma co-activator 1 alpha (PGC-1α), are associated with prenatal air pollution and whether there are underlying mechanisms. METHODS 556 mother-newborn pairs from the ENVIRONAGE birth cohort were recruited at the East Limburg Hospital in Genk (Belgium). In placenta and cord blood, telomere length (TL) and mitochondrial DNA content (mtDNAc) were measured using quantitative real-time polymerase chain reaction (qPCR). In cord plasma, p53 and PGC-1α protein levels were measured using ELISA. Daily ambient PM2.5 concentrations during gestation were calculated using a spatial temporal interpolation model. Distributed lag models (DLMs) were applied to assess the association between prenatal PM2.5 exposure and each molecular marker. Mediation analysis was performed to test for underlying mechanisms. RESULTS A 5 µg/m3 increment in PM2.5 exposure was associated with -11.23 % (95 % CI: -17.36 % to -4.65 %, p = 0.0012) and -7.34 % (95 % CI: -11.56 % to -2.92 %, p = 0.0014) lower placental TL during the entire pregnancy and second trimester respectively, and with -12.96 % (95 % CI: -18.84 % to -6.64 %, p < 0.001) lower placental mtDNAc during the third trimester. Furthermore, PM2.5 exposure was associated with a 12.42 % (95 % CI: -1.07 % to 27.74 %, p = 0.059) higher cord plasma p53 protein level and a -3.69 % (95 % CI: -6.97 % to -0.31 %, p = 0.033) lower cord plasma PGC-1α protein level during the third trimester. Placental TL mediated 65 % of the negative and 17 % of the positive association between PM2.5 and placental mtDNAc and cord plasma p53 protein levels, respectively. CONCLUSION Ambient PM2.5 exposure during pregnancy is associated with markers of the core-axis of aging, with TL as a mediating factor. This study strengthens the hypothesis of the air pollution induced core-axis of aging, and may unravel a possible underlying mediating mechanism in an early-life epidemiological context.
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Affiliation(s)
| | - Tim S Nawrot
- Centre for Environmental Sciences, Hasselt University, Hasselt, Belgium; Department of Public Health & Primary Care, Occupational & Environmental Medicine, Leuven University, Leuven, Belgium
| | - Congrong Wang
- Centre for Environmental Sciences, Hasselt University, Hasselt, Belgium
| | - Wouter Lefebvre
- Flemish Institute for Technological Research (VITO), Mol, Belgium
| | | | - Michelle Plusquin
- Centre for Environmental Sciences, Hasselt University, Hasselt, Belgium
| | - Harry A Roels
- Centre for Environmental Sciences, Hasselt University, Hasselt, Belgium; Louvain Centre for Toxicology and Applied Pharmacology, Université catholique de Louvain, Brussels, Belgium
| | - Bram G Janssen
- Centre for Environmental Sciences, Hasselt University, Hasselt, Belgium
| | - Dries S Martens
- Centre for Environmental Sciences, Hasselt University, Hasselt, Belgium.
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