1
|
Sharma K, Mishra A, Singh H, Thinlas T, Pasha MAQ. Differential methylation in EGLN1 associates with blood oxygen saturation and plasma protein levels in high-altitude pulmonary edema. Clin Epigenetics 2022; 14:123. [PMID: 36180894 PMCID: PMC9526282 DOI: 10.1186/s13148-022-01338-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 09/13/2022] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND High-altitude (HA, 2500 m) hypoxic exposure evokes a multitude of physiological processes. The hypoxia-sensing genes though influence transcriptional output in disease susceptibility; the exact regulatory mechanisms remain undetermined in high-altitude pulmonary edema (HAPE). Here, we investigated the differential DNA methylation distribution in the two genes encoding the oxygen-sensing HIF-prolyl hydroxylases, prolyl hydroxylase domain protein 2 (PHD2) and factor inhibiting HIF-1α and the consequent contributions to the HAPE pathophysiology. METHODS Deep sequencing of the sodium bisulfite converted DNA segments of the two genes, Egl nine homolog 1 (EGLN1) and Hypoxia Inducible Factor 1 Subunit Alpha Inhibitor (HIF1AN), was conducted to analyze the differential methylation distribution in three study groups, namely HAPE-patients (HAPE-p), HAPE-free sojourners (HAPE-f) and healthy HA natives (HLs). HAPE-p and HAPE-f were permanent residents of low altitude (< 200 m) of North India who traveled to Leh (3500 m), India, and were recruited through Sonam Norboo Memorial (SNM) hospital, Leh. HLs were permanent residents of altitudes at and above 3500 m. In addition to the high resolution, bisulfite converted DNA sequencing, gene expression of EGLN1 and HIF1AN and their plasma protein levels were estimated. RESULTS A significantly lower methylation distribution of CpG sites was observed in EGLN1 and higher in HIF1AN (P < 0.01) in HAPE-p compared to the two control groups, HAPE-f and HLs. Of note, differential methylation distribution of a few CpG sites, 231,556,748, 231,556,804, 231,556,881, 231,557,317 and 231,557,329, in EGLN1 were significantly associated with the risk of HAPE (OR = 4.79-10.29; P = 0.048-004). Overall, the methylation percentage in EGLN1 correlated with upregulated plasma PHD2 levels (R = - 0.36, P = 0.002) and decreased peripheral blood oxygen saturation (SpO2) levels (R = 0.34, P = 0.004). We also identified a few regulatory SNPs in the DNA methylation region of EGLN1 covering chr1:231,556,683-231,558,443 suggestive of the functional role of differential methylation distribution of these CpG sites in the regulation of the genes and consequently in the HIF-1α signaling. CONCLUSIONS Significantly lower methylation distribution in EGLN1 and the consequent physiological influences annotated its functional epigenetic relevance in the HAPE pathophysiology.
Collapse
Affiliation(s)
- Kavita Sharma
- Genomics and Molecular Medicine, CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | - Aastha Mishra
- Genomics and Molecular Medicine, CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | - Himanshu Singh
- Genomics and Molecular Medicine, CSIR-Institute of Genomics and Integrative Biology, Delhi, India
| | | | - M A Qadar Pasha
- Genomics and Molecular Medicine, CSIR-Institute of Genomics and Integrative Biology, Delhi, India. .,Institute of Hypoxia Research, Hypobaric Hypoxia Society, Delhi, New Delhi, 110067, India.
| |
Collapse
|
2
|
Wu P, Xiang T, Wang J, Lv R, Ma S, Yuan L, Wu G, Che X. Identification of immunization-related new prognostic biomarkers for papillary renal cell carcinoma by integrated bioinformatics analysis. BMC Med Genomics 2021; 14:241. [PMID: 34620162 PMCID: PMC8499437 DOI: 10.1186/s12920-021-01092-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2021] [Accepted: 09/21/2021] [Indexed: 12/24/2022] Open
Abstract
Background Despite papillary renal cell carcinoma (pRCC) being the second most common type of kidney cancer, the underlying molecular mechanism remains unclear. Targeted therapies in the past have not been successful because of the lack of a clear understanding of the molecular mechanism. Hence, exploring the underlying mechanisms and seeking novel biomarkers for pursuing a precise prognostic biomarker and appropriate therapies are critical. Material and methods In our research, the differentially expressed genes (DEGs) were screened from the TCGA and GEO databases, and a total of 149 upregulated and 285 downregulated genes were sorted. This was followed by construction of functional enrichment and protein–protein interaction (PPI) network, and then the top 15 DEGs were selected for further analysis. The P4HB gene was chosen as our target gene by repetitively validating multiple datasets, and higher levels of P4HB expression predicted lower overall survival (OS) in patients with pRCC. Results We found that P4HB not only connects with immune cell infiltration and co-expression with PD-1, PD-L2, and CTLA-4, but also has a strong connection with the newly discovered hot gene, TOX. Conclusion We speculate that P4HB is a novel gene involved in the progression of pRCC through immunomodulation. Supplementary Information The online version contains supplementary material available at 10.1186/s12920-021-01092-w.
Collapse
Affiliation(s)
- Ping Wu
- Department of Anesthesiology, The First Affiliated Hospital of Dalian Medical University, Dalian, 116000, China
| | - Tingting Xiang
- Department of Rehabilitation, Liguang Rehabilitation Hospital of Dalian Development Zone, Dalian, 116600, China
| | - Jing Wang
- Department of Neurobiology, Harbin Medical University, Harbin, 150086, China
| | - Run Lv
- Department of Anesthesiology, Dalian Medical University, Dalian, 116044, China
| | - Shaoxin Ma
- Department of Anesthesiology, Dalian Medical University, Dalian, 116044, China
| | - Limei Yuan
- Department of Anesthesiology, Dalian Medical University, Dalian, 116044, China
| | - Guangzhen Wu
- Department of Urology, The First Affiliated Hospital of Dalian Medical University, Dalian, 116000, China.
| | - Xiangyu Che
- Department of Urology, The First Affiliated Hospital of Dalian Medical University, Dalian, 116000, China.
| |
Collapse
|
3
|
Abstract
To simulate and study the hypoxic microenvironment associated with intracerebral glioma in vivo, simple and reproducible methods are described and discussed for inducing hypoxia or chemical pseudohypoxia in glioma cell cultures and assessing their effects on the expression and nuclear translocation of hypoxia-inducible factor (HIF)-1α, a key transcriptional factor of oxygen homeostasis, by Western blot analysis and immunocytochemistry.
Collapse
Affiliation(s)
- Jean-Pierre Gagner
- Microvascular and Molecular Neuro-Oncology Laboratory, Department of Pathology, NYU Langone Medical Center, New York, NY, USA.,Department of Pathology, NYU Langone Medical Center, New York, NY, USA
| | - Mirna Lechpammer
- Department of Pathology and Laboratory Medicine, Division of Neuropathology, Medical Center, University of California, Davis, Sacramento, CA, USA
| | - David Zagzag
- Microvascular and Molecular Neuro-Oncology Laboratory, Department of Pathology, NYU Langone Medical Center, New York, NY, USA. .,Department of Pathology, NYU Langone Medical Center, New York, NY, USA. .,Division of Neuropathology, Department of Neurosurgery, NYU Langone Medical Center, New York, NY, USA. .,NYU Langone Laura and Isaac Perlmutter Cancer Center, New York, NY, USA.
| |
Collapse
|
4
|
Janjić K, Alhujazy U, Moritz A, Agis H. L-mimosine and hypoxia enhance angiopoietin-like 4 production involving hypoxia-inducible factor-1alpha: Insights from monolayer and spheroid cultures of dental pulp-derived cells and tooth slice cultures. Arch Oral Biol 2018; 85:172-7. [PMID: 29100106 DOI: 10.1016/j.archoralbio.2017.10.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Revised: 10/10/2017] [Accepted: 10/14/2017] [Indexed: 12/11/2022]
Abstract
OBJECTIVE Angiopoietin-like 4 (Angptl4) is an angiogenesis modulating signaling factor and as such involved in blood vessel formation but also in hard tissue resorption. Here we hypothesized that the hypoxia mimetic agent L-mimosine (L-MIM) and hypoxia stimulate the production of Angptl4 in the dental pulp. MATERIAL AND METHODS Monolayer and spheroid cultures of primary human dental pulp-derived cells (DPC) were treated with L-MIM or hypoxia. Furthermore, tooth slice cultures were performed. The production of Angptl4 was assessed at mRNA and protein levels using reverse transcription qPCR and immunoassays, respectively. To assess the involvement of hypoxia inducible factor (HIF)-1α (HIF-1signaling, inhibitor studies with echinomycin and Western Blot analysis for HIF-1α were performed in DPC monolayer cultures.(HIF-1 RESULTS: L-MIM and hypoxia increased production of Angptl4 at mRNA and protein levels in monolayer cultures of DPC. The increase of Angptl4 was paralleled by an increase of HIF-1α and inhibited by echinomycin. Angptl4 protein levels were also elevated in spheroid cultures. In tooth slice cultures, the pulp tissue expressed and released Angptl4 under normoxic and hypoxic conditions and in the presence of L-MIM. There was a trend for an increase in Angptl4 mRNA levels and a trend for a decrease in the protein levels of the supernatants. CONCLUSIONS Our results suggest that the hypoxia mimetic agent L-MIM and hypoxia can increase Angptl4 production in DPC involving HIF-1α. However, the increase in the cell culture supernatants does not translate in an increased release in tooth slice organ cultures.
Collapse
|
5
|
Janjić K, Edelmayer M, Moritz A, Agis H. L-mimosine and hypoxia can increase angiogenin production in dental pulp-derived cells. BMC Oral Health 2017; 17:87. [PMID: 28545523 PMCID: PMC5445368 DOI: 10.1186/s12903-017-0373-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Accepted: 05/03/2017] [Indexed: 12/17/2022] Open
Abstract
Background Angiogenin is a key molecule in the healing process which has been successfully applied in the field of regenerative medicine. The role of angiogenin in dental pulp regeneration is unclear. Here we aimed to reveal the impact of the hypoxia mimetic agent L-mimosine (L-MIM) and hypoxia on angiogenin in the dental pulp. Methods Human dental pulp-derived cells (DPC) were cultured in monolayer and spheroid cultures and treated with L-MIM or hypoxia. In addition, tooth slice organ cultures were applied to mimic the pulp-dentin complex. We measured angiogenin mRNA and protein levels using qPCR and ELISA, respectively. Inhibitor studies with echinomycin were performed to reveal the role of hypoxia-inducible factor (HIF)-1 signaling. Results Both, L-MIM and hypoxia increased the production of angiogenin at the protein level in monolayer cultures of DPC, while the increase at the mRNA level did not reach the level of significance. The increase of angiogenin in response to treatment with L-MIM or hypoxia was reduced by echinomycin. In spheroid cultures, L-MIM increased angiogenin at protein levels while the effect of hypoxia was not significant. Angiogenin was also expressed and released in tooth slice organ cultures under normoxic and hypoxic conditions and in the presence of L-MIM. Conclusions L-MIM and hypoxia modulate production of angiogenin via HIF-1 differentially and the response depends on the culture model. Given the role of angiogenin in regeneration the here presented results are of high relevance for pre-conditioning approaches for cell therapy and tissue engineering in the field of regenerative endodontics.
Collapse
Affiliation(s)
- Klara Janjić
- Department of Conservative Dentistry and Periodontology, School of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, Donaueschingenstr. 13, 1200, Vienna, Austria
| | - Michael Edelmayer
- Austrian Cluster for Tissue Regeneration, Donaueschingenstr. 13, 1200, Vienna, Austria.,Department of Oral Surgery, School of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090, Vienna, Austria
| | - Andreas Moritz
- Department of Conservative Dentistry and Periodontology, School of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090, Vienna, Austria.,Austrian Cluster for Tissue Regeneration, Donaueschingenstr. 13, 1200, Vienna, Austria
| | - Hermann Agis
- Department of Conservative Dentistry and Periodontology, School of Dentistry, Medical University of Vienna, Sensengasse 2a, 1090, Vienna, Austria. .,Austrian Cluster for Tissue Regeneration, Donaueschingenstr. 13, 1200, Vienna, Austria.
| |
Collapse
|
6
|
Abstract
Pulmonary arterial hypertension (PAH) is a lung vascular disease characterized with a progressive increase of pulmonary vascular resistance and obliterative pulmonary vascular remodeling resulting in right heart failure and premature death. In this brief review, we document the recent advances in identifying genetically modified murine models of PH, with a focus on the recent discovery of the mouse model of Tie2 Cre-mediated deletion of prolyl hydroxylase 2, which exhibits progressive obliterative vascular remodeling, severe PAH, and right heart failure, thus recapitulating many of the features of clinical PAH. We will also discuss the translational potential of recent findings arising from experimental studies of murine PH models.
Collapse
Affiliation(s)
- Zhiyu Dai
- Department of Pharmacology, University of Illinois College of Medicine, Chicago, IL 60612, USA; Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, IL 60612, USA
| | - You-Yang Zhao
- Department of Pharmacology, University of Illinois College of Medicine, Chicago, IL 60612, USA; Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, IL 60612, USA.
| |
Collapse
|
7
|
Speer RE, Karuppagounder SS, Basso M, Sleiman SF, Kumar A, Brand D, Smirnova N, Gazaryan I, Khim SJ, Ratan RR. Hypoxia-inducible factor prolyl hydroxylases as targets for neuroprotection by "antioxidant" metal chelators: From ferroptosis to stroke. Free Radic Biol Med 2013; 62:26-36. [PMID: 23376032 PMCID: PMC4327984 DOI: 10.1016/j.freeradbiomed.2013.01.026] [Citation(s) in RCA: 105] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2012] [Revised: 01/23/2013] [Accepted: 01/23/2013] [Indexed: 01/12/2023]
Abstract
Neurologic conditions including stroke, Alzheimer disease, Parkinson disease, and Huntington disease are leading causes of death and long-term disability in the United States, and efforts to develop novel therapeutics for these conditions have historically had poor success in translating from bench to bedside. Hypoxia-inducible factor (HIF)-1α mediates a broad, evolutionarily conserved, endogenous adaptive program to hypoxia, and manipulation of components of the HIF pathway is neuroprotective in a number of human neurological diseases and experimental models. In this review, we discuss molecular components of one aspect of hypoxic adaptation in detail and provide perspective on which targets within this pathway seem to be ripest for preventing and repairing neurodegeneration. Further, we highlight the role of HIF prolyl hydroxylases as emerging targets for the salutary effects of metal chelators on ferroptosis in vitro as well in animal models of neurological diseases.
Collapse
Affiliation(s)
- Rachel E Speer
- Graduate Program in Neuroscience, Weill Medical College of Cornell University, New York, NY 10065, USA; Department of Neurology and Neuroscience, Weill Medical College of Cornell University, New York, NY 10065, USA; Burke Medical Research Institute, White Plains, NY 10605, USA
| | - Saravanan S Karuppagounder
- Department of Neurology and Neuroscience, Weill Medical College of Cornell University, New York, NY 10065, USA; Burke Medical Research Institute, White Plains, NY 10605, USA
| | - Manuela Basso
- Department of Neurology and Neuroscience, Weill Medical College of Cornell University, New York, NY 10065, USA; Burke Medical Research Institute, White Plains, NY 10605, USA
| | - Sama F Sleiman
- Department of Neurology and Neuroscience, Weill Medical College of Cornell University, New York, NY 10065, USA; Burke Medical Research Institute, White Plains, NY 10605, USA
| | - Amit Kumar
- Department of Neurology and Neuroscience, Weill Medical College of Cornell University, New York, NY 10065, USA; Burke Medical Research Institute, White Plains, NY 10605, USA
| | - David Brand
- Department of Neurology and Neuroscience, Weill Medical College of Cornell University, New York, NY 10065, USA; Burke Medical Research Institute, White Plains, NY 10605, USA
| | - Natalya Smirnova
- Department of Neurology and Neuroscience, Weill Medical College of Cornell University, New York, NY 10065, USA; Burke Medical Research Institute, White Plains, NY 10605, USA
| | - Irina Gazaryan
- Department of Neurology and Neuroscience, Weill Medical College of Cornell University, New York, NY 10065, USA; Burke Medical Research Institute, White Plains, NY 10605, USA
| | - Soah J Khim
- Department of Neurology and Neuroscience, Weill Medical College of Cornell University, New York, NY 10065, USA; Burke Medical Research Institute, White Plains, NY 10605, USA
| | - Rajiv R Ratan
- Department of Neurology and Neuroscience, Weill Medical College of Cornell University, New York, NY 10065, USA; Burke Medical Research Institute, White Plains, NY 10605, USA.
| |
Collapse
|
8
|
Luo X, Hill M, Johnson A, Latunde-Dada GO. Modulation of Dcytb (Cybrd 1) expression and function by iron, dehydroascorbate and Hif-2α in cultured cells. Biochim Biophys Acta Gen Subj 2013; 1840:106-12. [PMID: 23981688 DOI: 10.1016/j.bbagen.2013.08.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Revised: 07/24/2013] [Accepted: 08/17/2013] [Indexed: 01/25/2023]
Abstract
BACKGROUND Duodenal cytochrome b (Dcytb) is a mammalian plasma ferric reductase enzyme that catalyses the reduction of ferric to ferrous ion in the process of iron absorption. The current study investigates the relationship between Dcytb, iron, dehydroascorbate (DHA) and Hif-2α in cultured cell lines. METHODS Dcytb and Hif-2α protein expression was analysed by Western blot technique while gene regulation was determined by quantitative PCR. Functional analyses were carried out by ferric reductase and (59)Fe uptake assays. RESULTS Iron and dehydroascorbic acid treatment of cells inhibited Dcytb mRNA and protein expression. Desferrioxamine also enhanced Dcytb mRNA level after cells were treated overnight. Dcytb knockdown in HuTu cells resulted in reduced mRNA expression and lowered reductase activity. Preloading cells with DHA (to enhance intracellular ascorbate levels) did not stimulate reductase activity fully in Dcytb-silenced cells, implying a Dcytb-dependence of ascorbate-mediated ferrireduction. Moreover, Hif-2α knockdown in HuTu cells led to a reduction in reductase activity and iron uptake. CONCLUSIONS Taken together, this study shows the functional regulation of Dcytb reductase activity by DHA and Hif-2α. GENERAL SIGNIFICANCE Dcytb is a plasma membrane protein that accepts electrons intracellularly from DHA/ascorbic acid for ferrireduction at the apical surface of cultured cells and enterocytes.
Collapse
Affiliation(s)
- Xiaomin Luo
- Diabetes and Nutritional Sciences Division, King's College London, London, UK
| | | | | | | |
Collapse
|
9
|
Soñanez-Organis JG, Vázquez-Medina JP, Crocker DE, Ortiz RM. Prolonged fasting activates hypoxia inducible factors-1α, -2α and -3α in a tissue-specific manner in northern elephant seal pups. Gene 2013; 526:155-63. [PMID: 23707926 DOI: 10.1016/j.gene.2013.05.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Revised: 04/09/2013] [Accepted: 05/01/2013] [Indexed: 01/10/2023]
Abstract
Hypoxia inducible factors (HIFs) are important regulators of energy homeostasis and cellular adaptation to low oxygen conditions. Northern elephant seals are naturally adapted to prolonged periods (1-2 months) of food deprivation (fasting) which result in metabolic changes that may activate HIF-1. However, the effects of prolonged fasting on HIFs are not well defined. We obtained the full-length cDNAs of HIF-1α and HIF-2α, and partial cDNA of HIF-3α in northern elephant seal pups. We also measured mRNA and nuclear protein content of HIF-1α, -2α, -3α in muscle and adipose during prolonged fasting (1, 3, 5 & 7 weeks), along with mRNA expression of HIF-mediated genes, LDH and VEGF. HIF-1α, -2α and -3α are 2595, 2852 and 1842 bp and encode proteins of 823, 864 and 586 amino acid residues with conserved domains needed for their function (bHLH and PAS) and regulation (ODD and TAD). HIF-1α and -2α mRNA expression increased 3- to 5-fold after 7 weeks of fasting in adipose and muscle, whereas HIF-3α increased 5-fold after 7 weeks of fasting in adipose. HIF-2α protein expression was detected in nuclear fractions from adipose and muscle, increasing approximately 2-fold, respectively with fasting. Expression of VEGF increased 3-fold after 7 weeks in adipose and muscle, whereas LDH mRNA expression increased 12-fold after 7 weeks in adipose. While the 3 HIFα genes are expressed in muscle and adipose, only HIF-2α protein was detectable in the nucleus suggesting that HIF-2α may contribute more significantly in the up-regulation of genes involved in the metabolic adaptation during fasting in the elephant seal.
Collapse
|