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Green A, Cohen-Zion M, Haim A, Dagan Y. Comparing the response to acute and chronic exposure to short wavelength lighting emitted from computer screens. Chronobiol Int 2017; 35:90-100. [DOI: 10.1080/07420528.2017.1387555] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- A. Green
- The Israeli Center for Interdisciplinary Research in Chronobiology, University of Haifa, Haifa, Israel
- The Sleep and Fatigue Institute, Assuta Medical Center, Tel Aviv, Israel
| | - M. Cohen-Zion
- The Sleep and Fatigue Institute, Assuta Medical Center, Tel Aviv, Israel
- School of Behavioral Sciences, The Academic College of Tel Aviv Jaffa, Tel Aviv-Jaffa, Israel
| | - A. Haim
- The Israeli Center for Interdisciplinary Research in Chronobiology, University of Haifa, Haifa, Israel
| | - Y. Dagan
- The Israeli Center for Interdisciplinary Research in Chronobiology, University of Haifa, Haifa, Israel
- The Sleep and Fatigue Institute, Assuta Medical Center, Tel Aviv, Israel
- The Research Institute of Applied Chronobiology, The Academic College of Tel-Hai, Tel Hai, Israel
- The Department of Human Biology, University of Haifa, Haifa, Israel
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Green A, Cohen-Zion M, Haim A, Dagan Y. Evening light exposure to computer screens disrupts human sleep, biological rhythms, and attention abilities. Chronobiol Int 2017; 34:855-865. [DOI: 10.1080/07420528.2017.1324878] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- A. Green
- The Israeli Center for Interdisciplinary Research in Chronobiology, University of Haifa, Mount Carmel, Haifa, Israel
- The Sleep and Fatigue Institute, Assuta Medical Center, Tel Aviv, Israel
| | - M. Cohen-Zion
- The Sleep and Fatigue Institute, Assuta Medical Center, Tel Aviv, Israel
- School of Behavioral Sciences, The Academic College of Tel Aviv-Jaffa, Tel Aviv-Jaffa, Israel
| | - A. Haim
- The Israeli Center for Interdisciplinary Research in Chronobiology, University of Haifa, Mount Carmel, Haifa, Israel
- The Research Institute of Applied Chronobiology, The Academic College of Tel-Hai, Tel Hai, Israel
- The Department of Human Biology, University of Haifa, Mount Carmel, Haifa, Israel
| | - Y. Dagan
- The Israeli Center for Interdisciplinary Research in Chronobiology, University of Haifa, Mount Carmel, Haifa, Israel
- The Sleep and Fatigue Institute, Assuta Medical Center, Tel Aviv, Israel
- The Research Institute of Applied Chronobiology, The Academic College of Tel-Hai, Tel Hai, Israel
- The Department of Human Biology, University of Haifa, Mount Carmel, Haifa, Israel
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Han Q, Zhang M, Guo C, Shen G, Wang Y, Li B, Xu Z. Effect of population density on reproduction in Microtus fortis under laboratory conditions. ACTA BIOLOGICA HUNGARICA 2014; 65:121-31. [PMID: 24873906 DOI: 10.1556/abiol.65.2014.2.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Between December 2011 and March 2012, the reproductive characteristics of Microtus fortis reared in the laboratory at different population densities were assessed. In all, 258 male and female voles were randomly divided into 4 groups and reared at densities of 2, 4, 6, and 8 animals per cage (sex ratio: 1:1). The results showed that the pregnancy rate (χ2 = 21.671, df = 3, P < 0.001) and first farrowing interval (F = 12.355, df = 3, P < 0.001) were significantly different among the different population density groups, but the mean litter size (mean ± SD) was not (F = 2.669, df = 3, P > 0.05). In particular, the reproductive index and sex hormone levels showed a significant difference among the different density groups studied.
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Affiliation(s)
- Qunhua Han
- Chinese Academy of Sciences Dongting Lake Station for Wetland Ecosystem Research, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture Changsha 410125 China Sichuan University College of Life Science Chendu 610064 China
| | - Meiwen Zhang
- Chinese Academy of Sciences Dongting Lake Station for Wetland Ecosystem Research, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture Changsha 410125 China
| | - Cong Guo
- Sichuan University College of Life Science Chendu 610064 China
| | - Guo Shen
- Chinese Academy of Sciences Dongting Lake Station for Wetland Ecosystem Research, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture Changsha 410125 China
| | - Yong Wang
- Chinese Academy of Sciences Dongting Lake Station for Wetland Ecosystem Research, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture Changsha 410125 China
| | - Bo Li
- Chinese Academy of Sciences Dongting Lake Station for Wetland Ecosystem Research, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture Changsha 410125 China
| | - Zhenggang Xu
- Chinese Academy of Sciences Dongting Lake Station for Wetland Ecosystem Research, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture Changsha 410125 China
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Zhu Q, Gu L, Wang Y, Jia L, Zhao Z, Peng S, Lei L. The role of alpha-1 and alpha-2 adrenoceptors in restraint stress-induced liver injury in mice. PLoS One 2014; 9:e92125. [PMID: 24682087 PMCID: PMC3969348 DOI: 10.1371/journal.pone.0092125] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Accepted: 02/18/2014] [Indexed: 12/04/2022] Open
Abstract
Acute stress affects cellular integrity in many tissues including the liver, but its underlying mechanism is still unclear. The aim of the present study was to investigate the potential involvement of catecholamines and adrenoceptors in the regulation of acute restraint stress-induced liver injury. Restraint was achieved by placing mice in restraint tubes. Mice were treated with either an α-l antagonist, prazosin, an α-2 antagonist, yohimbine, a β-l antagonist, betaxolol, a β-2 antagonist, ICI 118551, or a central and peripheral catecholamine depleting agent, reserpine, and followed by restraint stress. Assessment of liver injury (serum alanine aminotransferase (ALT), aspartate aminotransferase (AST) , hepatic total GSH, GSSG and GSH/GSSG ratio) , histopathology and of apoptosis, by TUNEL (terminal deoxynucleotidyl transferase-mediated dUTP nick-end labelling) assay and western blotting, was performed. Three hours of restraint stress resulted in liver injury, as indexed by elevated serum transaminase levels, decreased hepatic total GSH levels and GSH/GSSG ratio, increased hepatic GSSG levels as well as enhanced hepatocytes apoptosis. Either reserpine or prazosin or yohimbine was found to attenuate liver injury. Furthermore, prazosin and yohimbine protected against restraint-induced hepatocytes apoptosis through attenuating the activation of caspases-9 and -3 and reducing the Bax/Bcl-2 ratio. These results suggest that α-1 and α-2 adrenoceptors mediate restraint-induced liver oxidative injury through caspase-9 and Bcl-2 family of apoptotic regulatory proteins.
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Affiliation(s)
- Qing Zhu
- School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China
- Evaluation and Research Center for Toxicology, Institute of Disease Control and Prevention, Academy of Military Medical Sciences, Beijing, China
| | - Liwei Gu
- Qinghaosu (Artemisinin) Research Center, Institute of Chinese Materia Medica, China Academy of Chinese Medical Sciences, Beijing, China
| | - Yimei Wang
- Evaluation and Research Center for Toxicology, Institute of Disease Control and Prevention, Academy of Military Medical Sciences, Beijing, China
| | - Li Jia
- Evaluation and Research Center for Toxicology, Institute of Disease Control and Prevention, Academy of Military Medical Sciences, Beijing, China
| | - Zengming Zhao
- Evaluation and Research Center for Toxicology, Institute of Disease Control and Prevention, Academy of Military Medical Sciences, Beijing, China
| | - Shuangqing Peng
- Evaluation and Research Center for Toxicology, Institute of Disease Control and Prevention, Academy of Military Medical Sciences, Beijing, China
- * E-mail: (LL); (SP)
| | - Linsheng Lei
- School of Pharmaceutical Sciences, Southern Medical University, Guangzhou, China
- * E-mail: (LL); (SP)
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Yang LJ, Liu X, Liu DX, Jiang H, Mao XQ, Wang C, Pan F. Effects of different adrenergic blockades on the stress resistance of Wistar rats. Neurosci Lett 2012; 511:95-100. [PMID: 22306185 DOI: 10.1016/j.neulet.2012.01.046] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2011] [Revised: 01/18/2012] [Accepted: 01/20/2012] [Indexed: 11/17/2022]
Abstract
The coordinated responses of the sympathoadreno-medullary (SAM) system and hypothalamic-pituitary-adrenal (HPA) axis could improve the organism's capacity to cope with stress, but its underlying mechanism is still unclear. In the present study, 32 Wistar rats were employed and divided into four groups: control, CUMS, PROP and PRAZ. After the chronic unpredicted mild stress (CUMS) model was built in the latter three groups, all animals were exposed to inescapable footshock. We found that α(1)-adrenoceptor antagonist prazosin (PRAZ) administration could improve behavior changes, reduce the cellular impairment in brain and inhibit the hyperfunction of HPA axis induced by CUMS exposure. Moreover, it decreased the heat shock protein 70 and inducible nitric oxide synthase expression in different brain areas as subsequently exposed to acute stress. In conclusion, α1-adrenoceptor may play a major role in regulating the coordinated responses between two physiological axes and improve the stress resistance.
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Affiliation(s)
- Le Jin Yang
- Institute of Medical Psychology, Shandong University Medical School, Jinan 250012, PR China
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Zubidat AE, Nelson RJ, Haim A. Photoentrainment in blind and sighted rodent species: responses to photophase light with different wavelengths. J Exp Biol 2010; 213:4213-22. [DOI: 10.1242/jeb.048629] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
SUMMARY
Our study examined the impact of daylight (photophase) wavelength on the photoentrainment sensitivity of two species with vastly different visual systems. Social voles (Microtus socialis) and ‘blind’ mole rats (Spalax ehrenbergi) were exposed to short-wavelength (479 nm) or long-wavelength (697 nm) light at an intensity of 293 μW cm–2. Rhythms of urine production, urinary 6-sulfatoxymelatonin (6-SMT), urinary metabolites of adrenaline and cortisol, and oxygen consumption (VO2) were used as markers for the sensitivity of the photoentrainment system. Significant 24-h rhythms were detected in all variables for both species under short-wavelength light, whereas ultradian rhythms of 12- or 8-h were detected under long-wavelength light. Wavelength inversely affected 6-SMT levels in M. socialis (negative correlation) and S. ehrenbergi (positive correlation). Increased levels of stress hormone metabolites were detected in M. socialis under the long-wavelength light whereas, in S. ehrenbergi elevated levels were secreted under short-wavelength light. Long-wavelength light increased VO2 in M. socialis and decreased it in S. ehrenbergi; short-wavelength light elicited the opposite effects. Our results indicate that photophase wavelength is an integral light property for modulating photoperiodic responses in mammals, including visually challenged species. Finally, the spectral-induced differential responses between the two species potentially represent adaptive physiological flexibility in species with contrasting visual and habitat challenges.
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Affiliation(s)
- Abed E. Zubidat
- Department of Evolution and Environmental Biology, University of Haifa, Mount Carmel, Haifa 31905, Israel
| | - Randy J. Nelson
- Departments of Neuroscience and Psychology, Ohio State University, Columbus, OH 43210, USA
| | - Abraham Haim
- Department of Evolution and Environmental Biology, University of Haifa, Mount Carmel, Haifa 31905, Israel
- The Israeli Center for Interdisciplinary Research in Chronobiology, University of Haifa, Mount Carmel, Haifa 31905, Israel
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Zubidat AE, Nelson RJ, Haim A. Differential effects of photophase irradiance on metabolic and urinary stress hormone concentrations in blind and sighted rodents. Chronobiol Int 2010; 27:487-516. [PMID: 20524797 DOI: 10.3109/07420521003678577] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
The effects of different photophase irradiance levels on the daily rhythms of energy expenditure (DEE, calculated from oxygen consumption, VO(2)) and urinary metabolites of stress hormones in sighted (Microtus socialis) and blind (Spalax ehrenbergi) rodents were compared. Five groups of each species were exposed to different irradiance levels (73, 147, 293, 366, and 498 microW/cm(2)) under short photoperiod (8L:16D) condition with constant ambient temperature 25 +/- 2 degrees C for 21 days before assessments. As light intensity increased from 73 microW/cm(2), both species reduced DEE, especially among M. socialis. Cosinor analysis revealed significant ultradian rhythms in VO(2) of M. socialis with period length being inversely related to irradiance level. Conversely, in S. ehrenbergi, robust 24 h VO(2) rhythms were detected at all irradiances. In M. socialis, significant 24 h rhythms in urinary output of adrenaline were detected only at 293 microW/cm(2), whereas for cortisol, unambiguous rhythms were detected at 73 and 147 microW/cm(2). Distinct adrenaline daily rhythms of S. ehrenbergi were observed at 73 and 293 microW/cm(2), whereas this species exhibited significant rhythms in cortisol at 147 and 293 microW/cm(2). Changes in photophase irradiance levels affected stress hormone concentrations in a dose-dependent manner. There were significant negative and positive correlations of M. socialis and S. ehrenbergi stress hormones, respectively, with increasing irradiance. Our results indicate photophase light intensity is another environmental factor that can significantly affect entrainment of mammalian daily rhythms. Both low and high irradiance conditions can trigger stress responses, depending on the species' natural habitat.
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Affiliation(s)
- Abed E Zubidat
- Department of Evolution and Environmental Biology, University of Haifa, Haifa, Israel.
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