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Nong W, Wei G, Wang J, Lei X, Wang J, Wei Y, Dong M, He L. Nicotinamide Mononucleotide Improves Spermatogenic Disorders in Aluminum-Exposed Rats by Modulating the Glycolytic Pathway. Biol Trace Elem Res 2024; 202:3180-3192. [PMID: 37851298 DOI: 10.1007/s12011-023-03904-9] [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: 09/06/2023] [Accepted: 10/02/2023] [Indexed: 10/19/2023]
Abstract
This study aimed to investigate the protective effect of nicotinamide mononucleotide (NMN) on testicular spermatogenesis in aluminum chloride (AlCl3)-exposed rats and to elucidate the potential underlying mechanism. The results indicated that AlCl3-induced testicular damage, leading to reduced sperm quality, increased apoptosis, decreased cell proliferation, and impaired Sertoli cell function in rats. Additionally, glycolytic metabolism was observed to be hindered. However, after NMN treatment, there was a noticeable improvement in testicular damage among the rats, marked by increased sperm quality, reduced apoptosis, enhanced cell proliferation, improved Sertoli cell function, and an activated glycolytic metabolism. The findings of this study suggest that NMN alleviates testicular spermatogenesis impairment induced by AlCl3 exposure through the inhibition of spermatogenic cell apoptosis, promotion of spermatogenic cell proliferation, and activation of glycolytic pathways. The study contributes an experimental foundation for potential future clinical applications of NMN in cases of AlCl3-exposed spermatogenic dysfunction.
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Affiliation(s)
- Weihua Nong
- Department of Obstetrics and Gynecology, The Affiliated Hospital of Youjiang Medical University for Nationalities, Zhongshan Second Road, Baise, 533300, Guangxi, China
- Reproductive Medicine, Guangxi Medical and Health Key Discipline Construction Project of the Affiliated Hospital of Youjiang Medical University for Nationalities, Baise, China
- Modern Industrial College of Biomedicine and Great Health, Youjiang Medical University for Nationalities, Chengxiang Road 98, Baise, 533300, Guangxi, China
| | - Gaomeng Wei
- Department of Urology, The Affiliated Hospital of Youjiang Medical University for Nationalities, Baise, China
| | - Junli Wang
- Reproductive Medicine, Guangxi Medical and Health Key Discipline Construction Project of the Affiliated Hospital of Youjiang Medical University for Nationalities, Baise, China
| | - Xiaocan Lei
- Department of Histology and Embryology, Clinical Anatomy & Reproductive Medicine Application Institute, Hengyang Medical School, University of South China, Hengyang, China
| | - Jinyuan Wang
- Department of Histology and Embryology, Clinical Anatomy & Reproductive Medicine Application Institute, Hengyang Medical School, University of South China, Hengyang, China
| | - Yanhong Wei
- Modern Industrial College of Biomedicine and Great Health, Youjiang Medical University for Nationalities, Chengxiang Road 98, Baise, 533300, Guangxi, China
| | - Mingyou Dong
- Modern Industrial College of Biomedicine and Great Health, Youjiang Medical University for Nationalities, Chengxiang Road 98, Baise, 533300, Guangxi, China.
| | - Liqiao He
- Department of Obstetrics and Gynecology, The Affiliated Hospital of Youjiang Medical University for Nationalities, Zhongshan Second Road, Baise, 533300, Guangxi, China.
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Abo El-Ela FI, Gamal A, El-Banna HA, Ibrahim MA, El-Banna AH, Abdel-Razik ARH, Abdel-Wahab A, Hassan WH, Abdelghany AK. Repro-protective activity of amygdalin and spirulina platensis in niosomes and conventional forms against aluminum chloride-induced testicular challenge in adult rats: role of CYP11A1, StAR, and HSD-3B expressions. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2024; 397:3211-3226. [PMID: 37910183 PMCID: PMC11074051 DOI: 10.1007/s00210-023-02788-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 10/12/2023] [Indexed: 11/03/2023]
Abstract
The male reproductive system is negatively influenced by Al exposure. Al represented a considerable hazard to men's reproduction capabilities. Amygdalin (AMG) and spirulina platensis (SP) have been considered to have a strong antioxidant and repro-protective activity; also, targeted drug delivery systems called niosomes improve the distribution of water-soluble medications like amygdalin and spirulina. Current study targeted to determine the effectiveness of AMG and SP against negative reproductive impact resulted by aluminum chloride (AlCl3) toxicity. Sixty adult male albino rats were separated into 6 groups, including the control group, which received distilled water; AlCl3 group, which received AlCl3; AMG+AlCl3 group, which received AlCl3+AMG; AMGLN+AlCl3 group, which received AlCl3+amygdalin-loaded niosomes; SP+AlCl3 group, which received AlCl3+SP; and SPLN+AlCl3 group, which received AlCl3+spirulina-loaded niosomes. All treatments were orally gavaged daily for 5 weeks, and rats were weighed weekly. At the termination of the experiment, some males (three from each group) were used for fertility traits via mating thirty virgin rat females (in a ratio of 1:2 and 2:3 male:female, respectively) followed by recording of birth weights and litter size (number of pups per each female) at birth to assess males' reproductive capability. Other males were euthanized for collection of serum, epididymal semen samples, and tissue samples for biochemical, sperm evaluation, gene expression, and histopathological measurements. There are a considerable number of negative impacts of AlCl3 on male fertility clarified by declined serum testosterone levels; an increased oxidative stress (MDA, TAC); deteriorated semen quality; down-regulation of CYP11A1, StAR, and HSD-3b gene expressions; and testicular tissue degenerative changes. In addition, litter size (number of pups per each female) and birth weights of pups obtained from mated females were affected. AMG and SP treatments, either in niosomal or conventional form, alleviated the AlCl3 negative effects by reducing oxidative stress; increasing testosterone levels; improving semen quality; upregulating of CYP11A1, StAR, and HSD-3b gene expressions; and reducing degenerative changes of testicular tissue. Besides, negative reproductive effect was diminished as observed by changes in the litter size (number of pups per each female) and birth weights of pups obtained from mated females. AMG and SP treatments (either in niosomal or conventional form), ameliorated the AlCl3 negative effects as they possess powerful antioxidant activity, as well as they have the ability to improve the reproductive activity of affected males.
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Affiliation(s)
- Fatma I Abo El-Ela
- Department of Pharmacology, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef, 62511, Egypt.
| | - Amr Gamal
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt
| | | | - Marwa A Ibrahim
- Department of Biochemistry and Molecular Biology, Faculty of Veterinary Medicine, Cairo University, Giza, 12211, Egypt
| | - Ahmed H El-Banna
- Michael Sayegh Faculty of Pharmacy, Aqaba University of Technology, Aqaba, Jordan
| | - Abdel-Razik H Abdel-Razik
- Department of Histology, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef, 62511, Egypt
| | - Ahmed Abdel-Wahab
- Department of Physiology, Faculty of Veterinary Medicine, Minia University, El-Minia, Egypt
| | - Walid Hamdy Hassan
- Department of Microbiology Mycology and Immunology, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef, 62511, Egypt
| | - Asmaa K Abdelghany
- Animal and Poultry Management and Wealth Development Department, Faculty of Veterinary Medicine, Beni-Suef University, Beni-Suef, 62511, Egypt
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Ma J, Sun B, Te LG, Huang X, Zuo X, Han XK, Wang SS. A Dietary Supplement Jinghuosu Ameliorates Reproductive Damage Induced by Tripterygium Glycosides. Chin J Integr Med 2024; 30:330-338. [PMID: 38212501 DOI: 10.1007/s11655-023-3750-9] [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] [Accepted: 05/26/2023] [Indexed: 01/13/2024]
Abstract
OBJECTIVE To determine the possible protective effects of Jinghuosu, a dietary supplement (DS), on tripterygium glycosides (TG)-induced reproductive system injury in rats and its underlying mechanisms. METHODS A reproductive damage model was established in rats by feeding of TGs. Twenty-eight male Sprague Dawley rats were randomly divided into 4 groups using a random number table (n=7 in each): control (C) group, model (M) group, DS group and L-carnitine (LC) group. Rats in M, DS and LC groups received 40 mg/kg TGs orally. Starting from the 5th week, after administration of TGs for 4 h every day, rats in DS and LC groups were administered with 2.7 g/kg DS and 0.21 g/kg LC, respectively, for protective treatment over the next 4 weeks. Rats in Group C continued to receive the control treatment. Hematoxylin-eosin staining was used for histopathological analysis of rat testicular tissues. Enzyme-linked immunosorbent assay was performed to measure alkaline phosphatase (ALP), lactate dehydrogenase, alcohol dehydrogenase, total antioxidant capacity (T-AOC), superoxide dismutase, glutathione peroxidase (GSH-Px), and malondialdehyde (MDA) concentrations. Chemiluminescence assay was used to determine the serum testosterone content. Quantitative real-time PCR and Western blotting were conducted to analyze the expression of genes and proteins related to the testosterone synthesis pathway and the nuclear factor erythroid 2-related factor 2/heme oxygenase 1 antioxidant pathway. RESULTS Oral administration of TGs induced significant increases in the testicular levels of zinc transporter 1 and MDA (P<0.05). On the other hand, sperm concentration, sperm motility, and serum testosterone, serum zinc, testicular zinc, Zrt-, Irt-like protein 1, ALP, luteinizing hormone (LH) receptor, steroidogenic acute regulatory protein, Cytochrome P450 family 11 subfamily A member 1, 3 β -hydroxysteroid dehydrogenase 1 T-AOC, GSH-Px, nuclear factor erythroid 2-related factor 2, heme oxygenase-1 and NAD (P)H: quinone oxidoreductase 1 levels decreased following TGs exposure (P<0.05). All of these phenotypes were evidently reversed by DS (P<0.05). CONCLUSION DS Jinghuosu protects against TG-induced reproductive system injury in rats, probably by improving zinc homeostasis, enhancing the testosterone synthesis and attenuating oxidative stress.
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Affiliation(s)
- Jing Ma
- Hebei Key Laboratory of Reproductive Medicine, Hebei Institute of Reproductive Health, Hebei Reproductive Health Hospital, Shijiazhuang, 050071, China
| | - Bo Sun
- Graduate School of Hebei Medical University, Shijiazhuang, 050017, China
| | - Li-Ger Te
- Graduate School of Hebei Medical University, Shijiazhuang, 050017, China
| | - Xin Huang
- School of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, 050024, China
| | - Xin Zuo
- School of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, 050024, China
| | - Xiao-Ke Han
- Xingtai Infertility Specialist Hospital, Xingtai, Hebei Province, 054000, China
| | - Shu-Song Wang
- Hebei Key Laboratory of Reproductive Medicine, Hebei Institute of Reproductive Health, Hebei Reproductive Health Hospital, Shijiazhuang, 050071, China.
- Graduate School of Hebei Medical University, Shijiazhuang, 050017, China.
- School of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang, 050024, China.
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Ali FEM, Badran KSA, Baraka MA, Althagafy HS, Hassanein EHM. Mechanism and impact of heavy metal-aluminum (Al) toxicity on male reproduction: Therapeutic approaches with some phytochemicals. Life Sci 2024; 340:122461. [PMID: 38286208 DOI: 10.1016/j.lfs.2024.122461] [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: 11/09/2023] [Revised: 01/11/2024] [Accepted: 01/22/2024] [Indexed: 01/31/2024]
Abstract
Heavy metals are ubiquitous environmental toxicants that have been known to have a serious effect on human and animal health. Aluminum (Al) is a widely distributed metal in nature. Al exposure has a detrimental impact on human fertility. This review focused on Al-induced male reproductive toxicity and the potential therapeutic approaches with some phytochemicals. Data from the literature showed that Al exposure is accompanied by a drastic decline in blood levels of FSH, LH, and testosterone, reduced sperm count, and affected sperm quality. Al exposure at high levels can cause oxidative stress by increasing ROS and RNS production, mediated mainly by downregulating Nrf2 signaling. Moreover, several investigations demonstrated that Al exposure evoked inflammation, evidenced by increased TNF-α and IL-6 levels. Additionally, substantial evidence concluded the key role of apoptosis in Al-induced testicular toxicity mediated by upregulating caspase-3 and downregulating Bcl2 protein. The damaging effects of Al on mitochondrial bioenergetics are thought to be due to the excessive generation of free radicals. This review helps to clarify the main mechanism involved in Al-associated testicular intoxication and the treatment strategy to attenuate the notable harmful effects on the male reproductive system. It will encourage clinical efforts to target the pathway involved in Al-associated testicular intoxication.
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Affiliation(s)
- Fares E M Ali
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Al-Azhar University, Assiut Branch, Assiut 71524, Egypt.
| | - Khalid S A Badran
- Faculty of Pharmacy, Al-Azhar University, Assiut Branch, Assiut 71524, Egypt
| | - Mohammad A Baraka
- Faculty of Pharmacy, Al-Azhar University, Assiut Branch, Assiut 71524, Egypt
| | - Hanan S Althagafy
- Department of Biochemistry, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia
| | - Emad H M Hassanein
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Al-Azhar University, Assiut Branch, Assiut 71524, Egypt
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Xing Y, Li J, Yang J, Li J, Pang W, Martin FL, Xu L. Application of spectrochemical analysis with chemometrics to profile biochemical alterations in nanoplastic-exposed HepG 2 cells. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 336:122309. [PMID: 37543068 DOI: 10.1016/j.envpol.2023.122309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2023] [Revised: 08/01/2023] [Accepted: 08/03/2023] [Indexed: 08/07/2023]
Abstract
Humans are routinely exposed to nanoplastics (NPs) in various ways, and this exposure presents a significant health risk. Nevertheless, there remain gaps in our knowledge, particularly in the mechanisms of toxicity of NPs with different surface charges at very low environmental concentrations. Herein, a spectrochemical approach was used to profile the cytotoxicity of NPs with different surface charges in HepG2 cells. It was found that all three NPs can cause some biomolecular alterations in cells, affecting cellular lipids, proteins, amino acids, and genetic material. Of these, PS and PS-COOH led to a non-linear dose-response, which may be related to a biphasic dose-response, whereas PS-NH2 led to a linear dose-response with a gradual increase in toxicity with increasing exposure concentration. In addition, the spectroscopic results showed that surface modifications led to cellular biochemical changes and caused adverse biological effects, with PS-NH2 exhibiting higher toxicity compared to PS or PS-COOH along with an inhibition of cell proliferation. Surprisingly PS-COOH, although considered the least toxic NP, appears to cause DNA damage. Overall, the toxic effects of different surface-modified NPs in cells were detected for the first time by applying spectrochemical techniques, and these findings provide important data towards understanding the emerging widespread environmental pollution of NPs and their effects on humans.
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Affiliation(s)
- Yu Xing
- Institute of Quality Standard and Testing Technology, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China
| | - Jing Li
- Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
| | - Jingjing Yang
- Department of Biochemistry and Molecular Biology, School of Medicine & Holistic Integrative Medicine, Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization, Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Junyi Li
- National University of Singapore (Suzhou) Research Institute, Suzhou, 215128, China
| | - Weiyi Pang
- School of Public Health, Guilin Medical University, Guilin, 541199, China
| | - Francis L Martin
- Biocel Ltd, Hull, HU10 7TS, UK; Department of Cellular Pathology, Blackpool Teaching Hospitals NHS Foundation Trust, Whinney Heys Road, Blackpool, FY3 8NR, UK
| | - Li Xu
- Institute of Quality Standard and Testing Technology, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, China.
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Zou X, Zeng M, Zheng Y, Zheng A, Cui L, Cao W, Wang X, Liu J, Xu J, Feng Z. Comparative Study of Hydroxytyrosol Acetate and Hydroxytyrosol in Activating Phase II Enzymes. Antioxidants (Basel) 2023; 12:1834. [PMID: 37891913 PMCID: PMC10604236 DOI: 10.3390/antiox12101834] [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: 08/02/2023] [Revised: 09/20/2023] [Accepted: 09/30/2023] [Indexed: 10/29/2023] Open
Abstract
Nuclear factor E2-related factor 2 (Nrf2) is fundamental to the maintenance of redox homeostasis within cells via the regulation of a series of phase II antioxidant enzymes. The unique olive-derived phenolic compound hydroxytyrosol (HT) is recognized as an Nrf2 activator, but knowledge of the HT derivative hydroxytyrosol acetate (HTac) on Nrf2 activation remains limited. In this study, we observed that an HT pretreatment could protect the cell viability, mitochondrial membrane potential, and redox homeostasis of ARPE-19 cells against a t-butyl hydroperoxide challenge at 50 μM. HTac exhibited similar benefits at 10 μM, indicating a more effective antioxidative capacity compared with HT. HTac consistently and more efficiently activated the expression of Nrf2-regulated phase II enzymes than HT. PI3K/Akt was the key pathway accounting for the beneficial effects of HTac in ARPE-19 cells. A further RNA-Seq analysis revealed that in addition to the consistent upregulation of phase II enzymes, the cells presented distinct expression profiles after HTac and HT treatments. This indicated that HTac could trigger a diverse cellular response despite its similar molecular structure to HT. The evidence in this study suggests that Nrf2 activation is the major cellular activity shared by HTac and HT, and HTac is more efficient at activating the Nrf2 system. This supports its potential future employment in various disease management strategies.
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Affiliation(s)
- Xuan Zou
- National & Local Joint Engineering Research Center of Biodiagnosis and Biotherapy, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
- Precision Medical Institute, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710004, China
| | - Mengqi Zeng
- Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China
- School of Health and Life Sciences, University of Health and Rehabilitation Sciences, Qingdao 266071, China
| | - Yuan Zheng
- Department of Pediatrics, Central Hospital Affiliated to Shandong First Medical University, Jinan 250013, China
| | - Adi Zheng
- School of Medicine, Northwest University, Xi'an 710069, China
| | - Li Cui
- Center for Mitochondrial Biology and Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China
| | - Wenli Cao
- Center for Mitochondrial Biology and Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China
| | - Xueqiang Wang
- School of Health and Life Sciences, University of Health and Rehabilitation Sciences, Qingdao 266071, China
| | - Jiankang Liu
- School of Health and Life Sciences, University of Health and Rehabilitation Sciences, Qingdao 266071, China
- Center for Mitochondrial Biology and Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China
| | - Jie Xu
- Center for Mitochondrial Biology and Medicine, The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China
| | - Zhihui Feng
- Frontier Institute of Science and Technology, Xi'an Jiaotong University, Xi'an 710049, China
- School of Health and Life Sciences, University of Health and Rehabilitation Sciences, Qingdao 266071, China
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Huixin P, Guangji W, Yanxin H, Yanfang P, Huixiong Y, Xiong Z, Yu'an X, Wencheng C. Transcriptome-based analysis of the toxic effects of aluminum chloride exposure on spermatocytes. Toxicol In Vitro 2023; 92:105658. [PMID: 37544489 DOI: 10.1016/j.tiv.2023.105658] [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: 04/10/2023] [Revised: 07/16/2023] [Accepted: 07/30/2023] [Indexed: 08/08/2023]
Abstract
Aluminum chloride (AlCl3) exposure is pervasive in our daily lives. Numerous studies have demonstrated that exposure to AlCl3 can lead to male reproductive toxicity. However, the precise mechanism of action remains unclear. The objective of this study is to investigate the mechanism of aluminum-induced toxicity by analyzing the alterations in the global transcriptome gene profile of mouse spermatocytes (GC-2spd cells) exposed to AlCl3. GC-2spd cells were exposed to concentrations of 0, 1, 2, and 4 mM AlCl3, and high-throughput mRNA-seq was performed to investigate the changes in the transcriptome after exposure to 4 mM AlCl3. Our findings indicate that exposure to AlCl3 led to an increase in oxidative stress, disrupted glutathione metabolism, reduced cell viability, and altered gene expression in mouse spermatocytes. Gene enrichment analysis revealed that the differentially expressed genes (DEGs) were associated with various biological functions such as mitochondrial inner membrane, response to oxidative stress. Furthermore, these DEGs were found to be enriched in pathways including proteasome, glutathione metabolism, oxidative phosphorylation, and Hif-1 signaling pathway. Real-time PCR and western blot were employed to validate the expression alterations of pivotal genes, and the outcomes exhibited concordance with the mRNA-seq findings. This study provides a theoretical basis for revealing the potential mechanism of male reproductive toxicity caused by aluminum exposure.
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Affiliation(s)
- Peng Huixin
- The Affiliated Hospital of Youjiang Medical University for Nationalities, Baise 533000, Guangxi,China; Graduate School of Youjiang Medical University for Nationalities, Baise 533000, Guangxi, China
| | - Wei Guangji
- Graduate School of Youjiang Medical University for Nationalities, Baise 533000, Guangxi, China; Clinical Laboratory, The People's Hospital of Baise, Baise 530000, Guangxi, China
| | - Huang Yanxin
- The Affiliated Hospital of Youjiang Medical University for Nationalities, Baise 533000, Guangxi,China; Graduate School of Youjiang Medical University for Nationalities, Baise 533000, Guangxi, China
| | - Pang Yanfang
- The Affiliated Hospital of Youjiang Medical University for Nationalities, Baise 533000, Guangxi,China
| | - Yuan Huixiong
- The Affiliated Hospital of Youjiang Medical University for Nationalities, Baise 533000, Guangxi,China
| | - Zou Xiong
- Guangxi Key Laboratory of reproductive health and birth defect prevention, Nanning 530000, Guangxi, China
| | - Xie Yu'an
- Guangxi Key Laboratory of reproductive health and birth defect prevention, Nanning 530000, Guangxi, China.
| | - Chen Wencheng
- The Affiliated Hospital of Youjiang Medical University for Nationalities, Baise 533000, Guangxi,China; Graduate School of Youjiang Medical University for Nationalities, Baise 533000, Guangxi, China.
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Dietary Egg White Hydrolysate Prevents Male Reproductive Dysfunction after Long-Term Exposure to Aluminum in Rats. Metabolites 2022; 12:metabo12121188. [PMID: 36557226 PMCID: PMC9786572 DOI: 10.3390/metabo12121188] [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: 10/18/2022] [Revised: 11/22/2022] [Accepted: 11/25/2022] [Indexed: 11/29/2022] Open
Abstract
Aluminum (Al) is a non-essential metal omnipresent in human life and is considered an environmental toxicant. Al increases reactive oxygen production and triggers immune responses, contributing to chronic systemic inflammation development. Here, we have tested whether an egg white hydrolysate (EWH) with potential bioactive properties can protect against changes in reproductive function in rats exposed to long-term Al dietary levels at high and low doses. Male Wistar rats received orally: low aluminum level group-AlCl3 at 8.3 mg/kg b.w. for 60 days with or without EWH (1 g/kg/day); high aluminum level group-AlCl3 at 100 mg/kg b.w. for 42 days with or without EWH (1 g/kg/day). The co-administration of EWH prevented the increased Al deposition surrounding the germinative cells, reducing inflammation and oxidative stress in the reproductive organs. Furthermore, the daily supplementation with EWH maintained sperm production and sperm quality similar to those found in control animals, even after Al exposure at a high dietary contamination level. Altogether, our results suggest that EWH could be used as a protective agent against impairment in the reproductive system produced after long-term exposure to Al at low or high human dietary levels.
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Falade AO, Adewole KE, Adekola ARO, Ikokoh HA, Okaiyeto K, Oguntibeju OO. Aqueous extract of bay leaf ( Laurus nobilis) ameliorates testicular toxicity induced by aluminum chloride in rats. Vet World 2022; 15:2525-2534. [PMID: 36590130 PMCID: PMC9798052 DOI: 10.14202/vetworld.2022.2525-2534] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Accepted: 09/23/2022] [Indexed: 11/11/2022] Open
Abstract
Background and Aim Human exposure to aluminum is inevitable, and one of the most adverse health effects of aluminum is a decrease in male fertility rates. Therefore, this study investigated the ameliorative effects of an aqueous extract from Laurus nobilis-bay leaf (BL) on aluminum chloride (AlCl3)-induced testicular toxicity in rats. Materials and Methods Twenty-four Wistar rats were divided into four groups (n = 6, each group): The control (group 1) received normal saline; Group 2 animals were intraperitoneally administered with 30 mg/kg body weight (BW) AlCl3; and Groups 3 and 4 were co-administered AlCl3 with 125 or 250 mg/kg BW of BL extract, respectively, for 21 days. Testes, epididymis, and blood samples were collected. Testicular plasma enzyme activity was measured using a spectrophotometric assay, while concentrations of inflammatory biomarkers were determined using enzyme-linked immunosorbent assay kits. Results There was a significant increase (p < 0.05) in testicular enzyme activity in the group treated with AlCl3. However, there was no significant (p > 0.05) difference in testicular enzyme activity in groups co-administered AlCl3 and BL extract as compared with that in control. There was a significant (p < 0.05) increase in testicular nitrite concentration in the AlCl3-treated group, whereas the administration of BL extract significantly (p < 0.05) decreased nitrite concentration in Groups 3 and 4. Furthermore, the administration of BL extracts increased sperm count and improved the morphology of the testes in AlCl3-treated rats. Flavonoids, phenolic compounds, alkaloids, tannin, glycosides, saponin, anthraquinones, and steroids were identified in BL extract, with alkaloids and glycosides being the most abundant. Conclusion Aqueous extract from BL ameliorated the toxic effect of AlCl3 and exhibited anti-inflammatory properties by inhibiting nitrite production while improving sperm count and morphology in AlCl3-treated rats. The bioactivity of the extract may be attributed to the presence of a wide range of phytochemicals. Therefore, BL aqueous extract could be a promising source of novel compounds with male fertility-promoting and anti-inflammatory properties.
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Affiliation(s)
- Ayodeji O. Falade
- Department of Biochemistry, Faculty of Basic Medical Sciences, University of Medical Sciences, Ondo 351101, Ondo State, Nigeria,Corresponding author: Ayodeji O. Falade, e-mail: Co-authors: KEA: , AOA: , HAI: , KO: , OOO:
| | - Kayode E. Adewole
- Department of Biochemistry, Faculty of Basic Medical Sciences, University of Medical Sciences, Ondo 351101, Ondo State, Nigeria
| | - Abdul-Rahman O. Adekola
- Department of Biochemistry, Faculty of Basic Medical Sciences, University of Medical Sciences, Ondo 351101, Ondo State, Nigeria
| | - Hilary A. Ikokoh
- Department of Biochemistry, Faculty of Basic Medical Sciences, University of Medical Sciences, Ondo 351101, Ondo State, Nigeria
| | - Kunle Okaiyeto
- Phytomedicine and Phytochemistry Group, Department of Biomedical Sciences, Faculty of Health and Wellness Sciences, Cape Peninsula University of Technology, Bellville 7535, South Africa
| | - Oluwafemi O. Oguntibeju
- Phytomedicine and Phytochemistry Group, Department of Biomedical Sciences, Faculty of Health and Wellness Sciences, Cape Peninsula University of Technology, Bellville 7535, South Africa
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The mechanisms of aluminum-induced immunotoxicity in chicks. Poult Sci 2022; 102:102251. [PMID: 36435164 PMCID: PMC9700292 DOI: 10.1016/j.psj.2022.102251] [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: 01/04/2022] [Revised: 09/28/2022] [Accepted: 10/11/2022] [Indexed: 11/24/2022] Open
Abstract
Aluminum (Al) is a ubiquitous environmental pollutant representing a significant global health hazard to human and animal health, including chicks. Al toxicity causes oxidative stress, leading to tissue injury, and consequently causes various diseases. NRF2 signaling is vital for protecting cells against oxidative stress. Nuclear xenobiotic receptors are activated by exogenous toxins, thereby inducing the transcription of cytochrome P450 enzyme systems (CYP450s) isoforms involved in xenobiotic metabolism and transport. However, little is known about Al-induced oxidative stress, nuclear xenobiotic receptors and fibrosis in chicks and the mechanisms involved. In this study, male chicks were treated with 0 mg/kg and 500 mg/kg Al2(SO4)3 to evaluate the mechanisms for Al-induced immunotoxicity. Histopathology revealed pathological injury, fibrin aggregation, disruption of the Nuclear Xenobiotic Receptors, and alteration of CYP450s homeostasis in Al-treated chicks due to oxidative stress. Notably, regulation of the NRF2 pathway and CYP450s and fibrosis-related genes was found to play a vital role in inhibiting immunotoxicity. This study provides new insights regarding the mechanisms of Al-induced immunotoxicity, including activation of the nuclear xenobiotic receptors, triggering oxidative stress, and altering the homeostasis of CYP450s in chicks. Further, it provides a theoretical basis for controlling Al exposure and highlights the importance of further studying its mechanisms to provide additional information for formulating preventive measures.
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11
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Ozcan Yildirim S, Colakoglu N, Ozer Kaya S. Protective effects of
L
‐arginine against aluminium chloride‐induced testicular damage in rats. Andrologia 2022; 54:e14569. [DOI: 10.1111/and.14569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 07/05/2022] [Accepted: 08/09/2022] [Indexed: 11/30/2022] Open
Affiliation(s)
- Sena Ozcan Yildirim
- Department of Histology and Embryology, Fethi Sekin City Hospital University of Health Sciences Elazig Turkey
| | - Neriman Colakoglu
- Department of Histology and Embryology, Medical School Firat University Elazig Turkey
| | - Seyma Ozer Kaya
- Department of Reproduction and Artificial Insemination, Faculty of Veterinary Firat University Elazig Turkey
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12
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PINK1/Parkin-mediated mitophagy is activated to protect against testicular damage caused by aluminum. J Inorg Biochem 2022; 232:111840. [DOI: 10.1016/j.jinorgbio.2022.111840] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 04/13/2022] [Accepted: 04/16/2022] [Indexed: 11/22/2022]
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13
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Khalaf HA, Elsamanoudy AZ, Abo-Elkhair SM, Hassan FE, Mohie PM, Ghoneim FM. Endoplasmic reticulum stress and mitochondrial injury are critical molecular drivers of AlCl 3-induced testicular and epididymal distortion and dysfunction: protective role of taurine. Histochem Cell Biol 2022; 158:97-121. [PMID: 35511291 PMCID: PMC9247002 DOI: 10.1007/s00418-022-02111-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/12/2022] [Indexed: 11/30/2022]
Abstract
Aluminum, the third most plentiful metal in the Earth's crust, has potential for human exposure and harm. Oxidative stress plays an essential role in producing male infertility by inducing defects in sperm functions. We aimed to investigate the role of endoplasmic reticulum (ER) stress and mitochondrial injury in the pathogenesis of aluminum chloride (AlCl3)-induced testicular and epididymal damage at the histological, biochemical, and molecular levels, and to assess the potential protective role of taurine. Forty-eight adult male albino rats were separated into four groups (12 in each): negative control, positive control, AlCl3, and AlCl3 plus taurine groups. Testes and epididymis were dissected. Histological and immunohistochemical (Bax and vimentin) studies were carried out. Gene expression of vimentin, PCNA, CHOP, Bcl-2, Bax, and XBP1 were investigated via quantitative real-time polymerase chain reaction (qRT-PCR), besides estimation of malondialdehyde (MDA) and total antioxidant capacity (TAC). Light and electron microscopic examinations of the testes and epididymis revealed pathological changes emphasizing both mitochondrial injury and ER stress in the AlCl3 group. Taurine-treated rats showed a noticeable improvement in the testicular and epididymal ultrastructure. Moreover, they exhibited increased gene expression of vimentin, Bcl-2, and PNCA accompanied by decreased CHOP, Bax, and XBP1 gene expression. In conclusion, male reproductive impairment is a significant hazard associated with AlCl3 exposure. Both ER stress and mitochondrial impairment are critical mechanisms of the deterioration in the testes and epididymis induced by AlCl3, but taurine can amend this.
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Affiliation(s)
- Hanaa A Khalaf
- Medical Histology and Cell Biology Department, Faculty of Medicine, Mansoura University, Mansoura, 35516, Egypt
| | - Ayman Z Elsamanoudy
- Medical Biochemistry and Molecular Biology Department, Faculty of Medicine, Mansoura University, Mansoura, 35516, Egypt
- Clinical Biochemistry Department, Faculty of Medicine, King Abdulaziz University, Jeddah, 21465, Saudi Arabia
| | - Salwa M Abo-Elkhair
- Medical Biochemistry and Molecular Biology Department, Faculty of Medicine, Mansoura University, Mansoura, 35516, Egypt
| | - Fatma E Hassan
- Medical Physiology Department, Kasr Alainy, Faculty of Medicine, Cairo University, Cairo, Egypt.
| | - Passant M Mohie
- Clinical Pharmacology Department, Faculty of Medicine, Alexandria University, Alexandria, Egypt
| | - Fatma M Ghoneim
- Medical Histology and Cell Biology Department, Faculty of Medicine, Mansoura University, Mansoura, 35516, Egypt
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14
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Cellat M, Kuzu M, İşler CT, Etyemez M, Dikmen N, Uyar A, Gökçek İ, Türk E, Güvenç M. Tyrosol improves ovalbumin (OVA)-induced asthma in rat model through prevention of airway inflammation. NAUNYN-SCHMIEDEBERG'S ARCHIVES OF PHARMACOLOGY 2021; 394:2061-2075. [PMID: 34287677 DOI: 10.1007/s00210-021-02117-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 06/23/2021] [Indexed: 01/01/2023]
Abstract
Asthma is an inflammatory disease that affects many people around the world, especially persons at paediatric age group. The effectiveness of tyrosol, a natural phenolic compound, was examined in the asthma model induced by ovalbumin (OVA). For this purpose, four groups, each consisting of eight rats, were arranged. For 21 days, physiological saline solution was treated to the control group and OVA was treated to the groups of OVA, OVA + dexamethasone (Dexa) and OVA + tyrosol groups, intraperitoneally and through inhalation. Additionally, 0.25 mg/kg Dexa was treated to the OVA + Dexa group and 20 mg/kg tyrosol to the OVA + tyrosol group by oral gavage. Serum, blood, bronchoalveolar lavage fluid (BALF) and lung tissues of the rats were examined. It was observed that MDA level decreased, GSH level and GPx activity increased, and there was no change in CAT activity in lung tissues of the tyrosol treatment groups. It was also observed that NF-κB, TNF-α, IL-4, IL-5, IL-13, IFN-γ and IgE levels decreased compared to the OVA group in lung tissue and serum samples except for serum NF-κB and IL-4. However, no effect on IL-1 β level was observed. In addition, it was determined that tyrosol treatment increased the IL-10 level on both tissue samples. The results of the histopathological investigation of lung tissue showed that tyrosol significantly ameliorated OVA-induced histopathological lesions. Additionally, PAS staining showed that mucus hypersecretion was significantly reduced with the use of tyrosol. In addition, it was determined that the number of eosinophils decreased significantly in blood and BALF samples. The obtained results showed that tyrosol possessed antioxidant and anti-inflammatory features on OVA-induced rats and preserved tissue architecture.
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Affiliation(s)
- Mustafa Cellat
- Faculty of Veterinary Medicine, Department of Physiology, Hatay Mustafa Kemal University, 31060, Hatay, Turkey.
| | - Müslüm Kuzu
- Faculty of Health Sciences, Department of Nutrition and Dietetics, Karabük University, Karabük, Turkey
| | - Cafer Tayer İşler
- Faculty of Veterinary Medicine, Department of Surgery, Hatay Mustafa Kemal University, Hatay, Turkey
| | - Muhammed Etyemez
- Faculty of Veterinary Medicine, Department of Physiology, Hatay Mustafa Kemal University, 31060, Hatay, Turkey
| | - Nursel Dikmen
- Faculty of Medicine, Department of Chest Diseases, Hatay Mustafa Kemal University, Hatay, Turkey
| | - Ahmet Uyar
- Faculty of Veterinary Medicine, Department of Pathology, Hatay Mustafa Kemal University, Hatay, Turkey
| | - İshak Gökçek
- Faculty of Veterinary Medicine, Department of Physiology, Hatay Mustafa Kemal University, 31060, Hatay, Turkey
| | - Erdinç Türk
- Faculty of Veterinary Medicine, Department of Pharmacology and Toxicology, Hatay Mustafa Kemal University, Hatay, Turkey
| | - Mehmet Güvenç
- Faculty of Veterinary Medicine, Department of Physiology, Hatay Mustafa Kemal University, 31060, Hatay, Turkey
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15
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Stenvinkel P, Avesani CM, Gordon LJ, Schalling M, Shiels PG. Biomimetics provides lessons from nature for contemporary ways to improve human health. J Clin Transl Sci 2021; 5:e128. [PMID: 34367673 PMCID: PMC8327543 DOI: 10.1017/cts.2021.790] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 05/06/2021] [Accepted: 05/07/2021] [Indexed: 02/08/2023] Open
Abstract
Homo sapiens is currently living in serious disharmony with the rest of the natural world. For our species to survive, and for our well-being, we must gather knowledge from multiple perspectives and actively engage in studies of planetary health. The enormous diversity of species, one of the most striking aspects of life on our planet, provides a source of solutions that have been developed through evolution by natural selection by animals living in extreme environments. The food system is central to finding solutions; our current global eating patterns have a negative impact on human health, driven climate change and loss of biodiversity. We propose that the use of solutions derived from nature, an approach termed biomimetics, could mitigate the effects of a changing climate on planetary health as well as human health. For example, activation of the transcription factor Nrf2 may play a role in protecting animals living in extreme environments, or animals exposed to heat stress, pollution and pesticides. In order to meet these challenges, we call for the creation of novel interdisciplinary planetary health research teams.
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Affiliation(s)
- Peter Stenvinkel
- Division of Renal Medicine, Department of Clinical Science, Technology and Intervention, Karolinska Institutet, Stockholm, Sweden
| | - Carla M. Avesani
- Division of Renal Medicine, Department of Clinical Science, Technology and Intervention, Karolinska Institutet, Stockholm, Sweden
| | - Line J. Gordon
- Stockholm Resilience Centre Stockholm University, Stockholm, Sweden
| | - Martin Schalling
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
| | - Paul G. Shiels
- Institute of Cancer Sciences, Wolfson Wohl Translational Research Centre, University of Glasgow, Bearsden, Glasgow, UK
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16
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Counteracting effects of heavy metals and antioxidants on male fertility. Biometals 2021; 34:439-491. [PMID: 33761043 DOI: 10.1007/s10534-021-00297-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Accepted: 03/04/2021] [Indexed: 01/06/2023]
Abstract
Infertility is regarded as a global health problem affecting 8-12% of couples. Male factors are regarded as the main cause of infertility in 40% of infertile couples and contribute to this condition in combination with female factors in another 20% of cases. Abnormal sperm parameters such as oligospermia, asthenospermia, and teratozoospermia result in male factor infertility. Several studies have shown the deteriorative impact of heavy metals on sperm parameters and fertility in human subjects or animal models. Other studies have pointed to the role of antioxidants in counteracting the detrimental effects of heavy metals. In the currents study, we summarize the main outcomes of studies that assessed the counteracting impacts of heavy metal and antioxidants on male fertility. Based on the provided data from animal studies, it seems rational to administrate appropriate antioxidants in persons who suffer from abnormal sperm parameters and infertility due to exposure to toxic elements. Yet, further human studies are needed to approve the beneficial effects of these antioxidants.
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17
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Türk E, Ozan Tekeli I, Özkan H, Uyar A, Cellat M, Kuzu M, Yavas I, Alizadeh Yegani A, Yaman T, Güvenç M. The protective effect of esculetin against aluminium chloride-induced reproductive toxicity in rats. Andrologia 2020; 53:e13930. [PMID: 33368464 DOI: 10.1111/and.13930] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2020] [Revised: 11/17/2020] [Accepted: 11/18/2020] [Indexed: 11/28/2022] Open
Abstract
One of the prominent health problems caused by Aluminium was the decrease in male fertility rates. In the study, the protective effect of Esculetin (ESC) against the reproductive toxicity induced by Aluminium chloride (AlCl3 ) was investigated. For this purpose, AlCl3 was administrated to Wistar Albino rats at a dose of 34 mg/kg and ESC was administrated at a dose of 50 mg/kg for 70 days. It was determined that AlCl3 treatment reduced sperm motility and concentration, increased dead/live rate and abnormal sperm rate. It decreased serum testosterone level, and co-treatment of ESC significantly regulated these values. In the AlCl3 -treated group, MDA level increased and GSH level, GPx and CAT activities decreased compared with those of the control group. However, co-treatment of ESC showed an amelioratory effect on the values except for CAT activity. It was observed that the expression level of NRF-2 increased in the ESC and AlCl3 + ESC groups, and NF-κB increased in the AlCl3 group with the control group. It was determined that Caspase-3 expression decreased, and Bcl-2 expression increased in AlCl3 + ESC group compared to AlCl3 group. It was also determined that AlCl3 -induced tissue injury was significantly prevented by ESC co-treatment.
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Affiliation(s)
- Erdinç Türk
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Mustafa Kemal University, Antakya-Hatay, Turkey
| | - Ibrahim Ozan Tekeli
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Mustafa Kemal University, Antakya-Hatay, Turkey
| | - Hüseyin Özkan
- Department of Genetics, Faculty of Veterinary Medicine, Mustafa Kemal University, Antakya-Hatay, Turkey
| | - Ahmet Uyar
- Department of Pathology, Faculty of Veterinary Medicine, Mustafa Kemal University, Antakya-Hatay, Turkey
| | - Mustafa Cellat
- Department of Physiology, Faculty of Veterinary Medicine, Mustafa Kemal University Antakya-Hatay, Turkey
| | - Müslüm Kuzu
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Karabuk University, Karabuk, Turkey
| | - Ilker Yavas
- Department of Reproduction and Artificial Insemination, Faculty of Veterinary Medicine, University of Mustafa Kemal, Antakya-Hatay, Turkey
| | - Arash Alizadeh Yegani
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Mustafa Kemal University, Antakya-Hatay, Turkey
| | - Turan Yaman
- Department of Pathology, Faculty of Veterinary Medicine, Yuzuncu Yil University, Van, Turkey
| | - Mehmet Güvenç
- Department of Physiology, Faculty of Veterinary Medicine, Mustafa Kemal University Antakya-Hatay, Turkey
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18
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Yokel RA. Aluminum reproductive toxicity: a summary and interpretation of scientific reports. Crit Rev Toxicol 2020; 50:551-593. [PMID: 32869713 DOI: 10.1080/10408444.2020.1801575] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Publications addressing aluminum (Al)-induced reproductive toxicity were reviewed. Key details were compiled in summary tables. Approximate systemic Al exposure, a measure of bioavailability, was calculated for each exposure, based on the Al percentage in the dosed Al species, Al bioavailability, and absorption time course reports for the exposure route. This was limited to laboratory animal studies because no controlled-exposure human studies were found. Intended Al exposure was compared to unintended dietary Al exposure. The considerable and variable Al content of laboratory animal diets creates uncertainty about reproductive function in the absence of Al. Aluminum-induced reproductive toxicity in female mice and rats was evident after exposure to ≥25-fold the amount of Al consumed in the diet. Generally, the additional daily Al systemic exposure of studies that reported statistically significant results was greater than 100-fold above the typical human daily Al dietary consumption equivalent. Male reproductive endpoints were significantly affected after exposure to lower levels of Al than females. Increased Al intake increased fetus, placenta, and testes Al concentrations, to a greater extent in the placenta than fetus, and, in some cases, more in the testes than placenta. An adverse outcome pathway (AOP) was constructed for males based on the results of the reviewed studies. The proposed AOP includes oxidative stress as the molecular initiating event and increased malondialdehyde, DNA and spermatozoal damage, and decreased blood testosterone and sperm count as subsequent key events. Recommendations for the design of future studies of reproductive outcomes following exposure to Al are provided.
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Affiliation(s)
- Robert A Yokel
- Department of Pharmaceutical Sciences, University of Kentucky Academic Medical Center, Lexington, KY, USA
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