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Tian R, Yang T, Xiao C, Li F, Fu L, Zhang L, Cai J, Zeng S, Liao J, Song G, Yu C, Zhang B, Liu Z. Outdoor artificial light at night and male sperm quality: A retrospective cohort study in China. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 341:122927. [PMID: 37977357 DOI: 10.1016/j.envpol.2023.122927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 11/03/2023] [Accepted: 11/10/2023] [Indexed: 11/19/2023]
Abstract
Due to the worldwide increased rate of infertility among reproductive-age couples, there is a growing interest in the relationship between environmental stimuli and human sperm quality. While animal studies have demonstrated the detrimental effects of outdoor artificial light at night (ALAN) on sperm quality, investigations based on human data are lacking. Therefore, we conducted a retrospective cohort study involving 1991 sperm donor candidates and employed multivariate linear regression and restricted cubic spline models to quantify the association between outdoor ALAN and sperm quality. The aim was to determine whether there exists an association between exposure to outdoor ALAN and sperm quality. The study included 1991 sperm donor candidates with the following characteristics: mean [SD] age, 24.98 [4.78] years; mean [SD] BMI, 22.13 [2.60] kg/m2; mean [SD] sleep duration, 7.66 [1.07] hours/day. Outdoor ALAN exposure of study participants ranged from 0 to 100 nW/cm2/sr. Multiple regression analysis on chronic exposure (0-90 days before sperm donation) and human sperm quality revealed the following associations: for CASA primary motion parameters, every 100-unit (nW/cm2/sr) increase in chronic outdoor ALAN was associated with a change of -0.043 [95%CI: 0.073, -0.014] in Linearity (LIN), and -5.523 [95%CI: 9.100, -1.946] in Curvilinear velocity (VCL). For CASA secondary motion parameters, every 100-unit (nW/cm2/sr) increase in chronic outdoor ALAN was associated with a change of -3.873 [95%CI: 4.926, -2.748] in non-progressive motility rate (NP). Furthermore, the primary sperm quality parameter exhibited a decline of -4.740 [95%CI: 8.853, -0.628] in sperm motility rate per 100-unit (nW/cm2/sr) increase in chronic outdoor ALAN. Similar associations were also observed for acute exposure (0-9 days before sperm donation). This retrospective study suggests that poorer sperm quality is more prevalent among adult males residing in areas with higher levels of outdoor ALAN, with a particularly pronounced impact observed in males below the age of 25 years.
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Affiliation(s)
- Run Tian
- Department of Maternal and Child Health, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China; Institute of Systems Epidemiology, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China
| | - Tingting Yang
- Department of Andrology/Sichuan Human Sperm Bank, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China; Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, Sichuan, 610041, PR China
| | - Chenghan Xiao
- Department of Maternal and Child Health, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China; Institute of Systems Epidemiology, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China
| | - Fuping Li
- Department of Andrology/Sichuan Human Sperm Bank, West China Second University Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China; Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Chengdu, Sichuan, 610041, PR China
| | - Leyao Fu
- Department of Maternal and Child Health, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China; Institute of Systems Epidemiology, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China
| | - Lu Zhang
- Department of Maternal and Child Health, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China; Institute of Systems Epidemiology, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China
| | - Jiarui Cai
- Department of Maternal and Child Health, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China; Institute of Systems Epidemiology, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China
| | - Sixuan Zeng
- Department of Maternal and Child Health, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China; Institute of Systems Epidemiology, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China
| | - Junhao Liao
- Department of Maternal and Child Health, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China; Institute of Systems Epidemiology, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China
| | - Guishuang Song
- Department of Maternal and Child Health, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China; Institute of Systems Epidemiology, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China
| | - Chuan Yu
- Department of Maternal and Child Health, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China; Institute of Systems Epidemiology, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China
| | - Ben Zhang
- Institute of Systems Epidemiology, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China; Department of Epidemiology and Biostatistics, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China
| | - Zhenmi Liu
- Department of Maternal and Child Health, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China; Institute of Systems Epidemiology, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China.
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Li T, Jiang YT, Qi XZ, Chen P, Zhang JH, Luo F, Qiao J, Gu J, Du GS, Wang Q. Circadian disturbance induces erectile dysfunction by impairing endothelial function. Asian J Androl 2023; 26:00129336-990000000-00143. [PMID: 38048170 PMCID: PMC10919418 DOI: 10.4103/aja202345] [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: 01/20/2023] [Accepted: 09/27/2023] [Indexed: 12/06/2023] Open
Abstract
ABSTRACT In order to explore the impact of circadian disturbance on erectile function, we randomly divided 24 adult male rats into groups of control (light on at 8:00 a.m. and off at 8:00 p.m.), dark/dark (DD; constant dark), light/light (LL; constant light), and shift dark/light (DL; light off at 8:00 a.m. and on at 8:00 p.m.). Four weeks later, erectile function was measured and corpora cavernosa were harvested for analysis. The maximum intracavernous pressure (mICP) and mICP/mean arterial pressure (MAP) ratio in the DD, LL, and DL groups were significantly lower than that in the control group. The LL and DL groups showed significantly attenuated endothelial nitric oxide synthase (eNOS), while DD, LL, and DL showed reduced neuronal nitric oxide synthase (nNOS) at both mRNA and protein levels. The production of nitric oxide (NO) and cyclic guanosine monophosphate (cGMP) was inhibited by altered light/dark cycles to varying degrees. Circadian disturbance impaired endothelial function and contributed to erectile dysfunction. For the core circadian elements, mRNA expression of circadian locomotor output cycles kaput (Clock) and brain/muscle aryl-hydrocarbon receptor nuclear translocator-like protein 1 (Bmal1) was elevated in the DL group, but their protein expression was not significantly changed. DD, LL, and DL increased period 1 (Per1) and Per3 levels, while LL and DL increased PER1 levels. No significant difference was found for Per2 levels, and PER2 and PER3 concentrations were not significantly changed. Moreover, LL and DL significantly increased cryptochrome-1 (CRY1) and CRY2 at both mRNA and protein levels. The altered light/dark rat model showed that circadian disturbance contributed to erectile dysfunction probably by impairing endothelial function. Meanwhile, the core circadian elements were detected in the corpora cavernosa, but these were disrupted. However, which circadian element regulates erectile function and how it works need further analysis.
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Affiliation(s)
- Tao Li
- Department of Urology, Affiliated Hospital of Guizhou Medical University, Guiyang 550004, China
- Department of Urology, Guizhou Provincial People’s Hospital, Guiyang 550002, China
| | - Yi-Ting Jiang
- Department of Otorhinolaryngology, Affiliated Hospital of Guizhou Medical University, Guiyang 550004, China
| | - Xin-Zhu Qi
- Guizhou Institute for Food and Drug Control, Guiyang 550004, China
| | - Peng Chen
- Department of Urology, Affiliated Hospital of Guizhou Medical University, Guiyang 550004, China
| | - Jun-Hao Zhang
- Department of Urology, Affiliated Hospital of Guizhou Medical University, Guiyang 550004, China
| | - Fu Luo
- Department of Reproductive Center, Guizhou Provincial People’s Hospital, Guiyang 550002, China
| | - Jun Qiao
- Department of Urology, Affiliated Hospital of Guizhou Medical University, Guiyang 550004, China
| | - Jiang Gu
- Department of Urology, Affiliated Hospital of Guizhou Medical University, Guiyang 550004, China
| | - Guang-Shi Du
- Translational Medicine Research Center of Guizhou Medical University, Guiyang 550025, China
| | - Qiang Wang
- Department of Urology, Affiliated Hospital of Guizhou Medical University, Guiyang 550004, China
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Ogo FM, Siervo GEML, Praxedes AM, Vieira HR, da Silva Scarton SR, Bitencourt ATG, Arena AC, Simão ANC, Guerra MT, de Freitas Mathias PC, Fernandes GSA. Gestational exposure to continuous light impairs the development of the female reproductive system in adult Wistar rat offspring. Birth Defects Res 2023; 115:710-721. [PMID: 36929866 DOI: 10.1002/bdr2.2161] [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: 05/15/2022] [Revised: 02/01/2023] [Accepted: 02/03/2023] [Indexed: 03/18/2023]
Abstract
INTRODUCTION It has been suggested that maternal exposure to constant light during the gestational period could be considered as a chronic stressor, impairing offspring development by interfering in neuroendocrine and behavior responses. OBJECTIVE This study aimed to evaluate whether maternal exposure to continuous light during pregnancy affects the adult reproductive system in the female offspring. MATERIALS AND METHODS Pregnant Wistar rats were allocated into light-dark (LD) group, exposed to light and dark photoperiod during gestation, and the light-light (LL) group, exposed to a photoperiod of constant light during gestation. After birth, pups were maintained under normal light-dark photoperiod until adulthood. At postnatal day 90, blood was collected from the female offspring, to analyze plasma luteinizing hormone (LH) and progesterone levels, and the uterus and ovaries were harvested for morphometric, histological, and oxidative stress evaluations. RESULTS AND DISCUSSION Female exposure to continuous light during the intrauterine period resulted in the adult reduction of LH and increased progesterone plasma levels, and uterine injuries a higher number of endometrial glands and reduced levels of antioxidant enzymes, such as glutathione reductase and glutathione S-transferase. In these experimental conditions, gestational continuous light exposure disturbs sex hormone balance and reduces the antioxidant enzymatic activity in the uterus of female offspring in adult life.
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Affiliation(s)
- Fernanda Mithie Ogo
- Department of General Biology, Biological Sciences Center, State University of Londrina - UEL, Londrina, Brazil.,Department of Pathological Sciences, Biological Sciences Center, State University of Londrina - UEL, Londrina, Brazil
| | - Glaucia Eloisa Munhoz Lion Siervo
- Department of General Biology, Biological Sciences Center, State University of Londrina - UEL, Londrina, Brazil.,Department of Pathological Sciences, Biological Sciences Center, State University of Londrina - UEL, Londrina, Brazil
| | - Ana Maria Praxedes
- Laboratory of Secretion Cell Biology, Department of Biotechnology, Genetics and Cell Biology, State University of Maringá, Maringá, Brazil
| | - Henrique Rodrigues Vieira
- Laboratory of Secretion Cell Biology, Department of Biotechnology, Genetics and Cell Biology, State University of Maringá, Maringá, Brazil
| | - Suellen Ribeiro da Silva Scarton
- Department of General Biology, Biological Sciences Center, State University of Londrina - UEL, Londrina, Brazil.,Department of Pathological Sciences, Biological Sciences Center, State University of Londrina - UEL, Londrina, Brazil
| | | | - Arielle Cristina Arena
- Department of Structural and Functional Biology, Institute of Biosciences of Botucatu, Universidade Estadual Paulista - Botucatu (UNESP), Botucatu, Brazil
| | - Andréa Name Colado Simão
- Department of Pathology, Clinical Analysis and Toxicology, Health Center, State University of Londrina - UEL, Londrina, Brazil
| | - Marina Trevizan Guerra
- Department of Cell Biology, Embryology and Histology, Federal University of Mato Grosso do Sul - UFMS, Três Lagoas, Brazil
| | - Paulo Cesar de Freitas Mathias
- Laboratory of Secretion Cell Biology, Department of Biotechnology, Genetics and Cell Biology, State University of Maringá, Maringá, Brazil
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Li T, Bai Y, Jiang Y, Jiang K, Tian Y, Gu J, Sun F. The potential impacts of circadian rhythm disturbances on male fertility. Front Endocrinol (Lausanne) 2022; 13:1001316. [PMID: 36277693 PMCID: PMC9582279 DOI: 10.3389/fendo.2022.1001316] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Accepted: 09/20/2022] [Indexed: 11/13/2022] Open
Abstract
A circadian rhythm is an internalized timing system that synchronizes the cellular, behavioral, and physiological processes of organisms to the Earth's rotation. Because all physiological activities occur at a specific time, circadian rhythm disturbances can lead to various pathological disorders and diseases. Growing evidence has shown that the circadian clock is tightly connected to male fertility, and circadian perturbations contribute to infertility. The night shiftwork, insufficient sleep, and poor sleep quality are common causes of circadian disturbances, and many studies have reported that they impair sperm quality and increase the risk of male infertility. However, research on the impacts of light, body temperature, and circadian/circannual rhythms is relatively lacking, although some correlations have been demonstrated. Moreover, as the index of sperm quality was diverse and study designs were non-uniform, the conclusions were temporarily inconsistent and underlying mechanisms remain unclear. A better understanding of whether and how circadian disturbances regulate male fertility will be meaningful, as more scientific work schedules and rational lifestyles might help improve infertility.
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Affiliation(s)
- Tao Li
- Department of Urology, Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - Yunjin Bai
- Department of Urology and Institute of Urology, West China Hospital, Sichuan University, Chengdu, China
| | - Yiting Jiang
- Department of Otorhinolaryngology, The Ninth People’s Hospital of Chongqing, Chongqing, China
| | - Kehua Jiang
- Department of Urology, Guizhou Provincial People’s Hospital, Guiyang, China
| | - Ye Tian
- Department of Urology, Guizhou Provincial People’s Hospital, Guiyang, China
| | - Jiang Gu
- Department of Urology, Affiliated Hospital of Guizhou Medical University, Guiyang, China
- *Correspondence: Fa Sun, ; Jiang Gu,
| | - Fa Sun
- Department of Urology, Guizhou Provincial People’s Hospital, Guiyang, China
- *Correspondence: Fa Sun, ; Jiang Gu,
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Li MD, Xin H, Yuan Y, Yang X, Li H, Tian D, Zhang H, Zhang Z, Han TL, Chen Q, Duan G, Ju D, Chen K, Deng F, He W. Circadian Clock-Controlled Checkpoints in the Pathogenesis of Complex Disease. Front Genet 2021; 12:721231. [PMID: 34557221 PMCID: PMC8452875 DOI: 10.3389/fgene.2021.721231] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Accepted: 08/16/2021] [Indexed: 12/26/2022] Open
Abstract
The circadian clock coordinates physiology, metabolism, and behavior with the 24-h cycles of environmental light. Fundamental mechanisms of how the circadian clock regulates organ physiology and metabolism have been elucidated at a rapid speed in the past two decades. Here we review circadian networks in more than six organ systems associated with complex disease, which cluster around metabolic disorders, and seek to propose critical regulatory molecules controlled by the circadian clock (named clock-controlled checkpoints) in the pathogenesis of complex disease. These include clock-controlled checkpoints such as circadian nuclear receptors in liver and muscle tissues, chemokines and adhesion molecules in the vasculature. Although the progress is encouraging, many gaps in the mechanisms remain unaddressed. Future studies should focus on devising time-dependent strategies for drug delivery and engagement in well-characterized organs such as the liver, and elucidating fundamental circadian biology in so far less characterized organ systems, including the heart, blood, peripheral neurons, and reproductive systems.
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Affiliation(s)
- Min-Dian Li
- Department of Cardiology and the Center for Circadian Metabolism and Cardiovascular Disease, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Haoran Xin
- Department of Cardiology and the Center for Circadian Metabolism and Cardiovascular Disease, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Yinglin Yuan
- Medical Center of Hematology, The Xinqiao Hospital of Army Medical University, Chongqing, China
| | - Xinqing Yang
- Department of Anesthesiology, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Hongli Li
- Department of Obstetrics and Gynaecology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Dingyuan Tian
- Department of Cardiology and the Center for Circadian Metabolism and Cardiovascular Disease, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Hua Zhang
- Department of Obstetrics and Gynaecology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Zhihui Zhang
- Department of Cardiology and the Center for Circadian Metabolism and Cardiovascular Disease, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, China
| | - Ting-Li Han
- Department of Obstetrics and Gynaecology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Qing Chen
- Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Army Medical University (Third Military Medical University), Chongqing, China
| | - Guangyou Duan
- Department of Anesthesiology, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Dapeng Ju
- Department of Anesthesiology, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Ka Chen
- Research Center for Nutrition and Food Safety, Institute of Military Preventive Medicine, Army Medical University, Chongqing, China
| | - Fang Deng
- Key Laboratory of Extreme Environmental Medicine, Department of Pathophysiology, College of High Altitude Military Medicine, Ministry of Education of China, Army Medical University (Third Military Medical University), Chongqing, China.,Key Laboratory of High Altitude Medicine, PLA, Army Medical University (Third Military Medical University), Chongqing, China
| | - Wenyan He
- Department of Dermatology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
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