Effects of Waterpipe Smoking, Immobilization and Darkness Stress on Serum Creatine Kinase and Alkaline Phosphatase Levels in Female Rats

AUTHORS

Rahim Ahmadi 1 , Sedigheh Molaei 2 , *

1 Department of Physiology, Faculty of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, IR Iran

2 Student Research Committee, School of Medicine, Qom University of Medical Sciences, Qom, IR Iran

How to Cite: Ahmadi R, Molaei S. Effects of Waterpipe Smoking, Immobilization and Darkness Stress on Serum Creatine Kinase and Alkaline Phosphatase Levels in Female Rats, Thrita. 2015 ; 4(4):e32693. doi: 10.5812/thrita.32693.

ARTICLE INFORMATION

Thrita: 4 (4); e32693
Published Online: December 14, 2015
Article Type: Research Article
Received: August 25, 2015
Accepted: August 26, 2015
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Abstract

Background: Various studies indicate that life style may influence serum enzyme levels.

Objectives: The aim of this study was to evaluate the effects of waterpipe smoking, immobilization and darkness stress on serum creatine kinase (CK) and alkaline phosphatase (ALP) levels in female rats.

Materials and Methods: Female Wistar rats were divided into control, waterpipe smoking, immobilized, under darkness stress, immobilized waterpipe smoking, under darkness stress waterpipe smoking, under darkness stress immobilized and under darkness stress immobilized waterpipe smoking of 7 each. Waterpipe smoking exposure was 10th/day for 10 minutes of each with 5 minutes resting time; chronically immobilization was applied 4 hours/day (twice a day for 2 hours with 2 hours resting time) and darkness stress for 6 hours/day in dark situation. Following 7 weeks experiment, serum enzyme levels were measured and compared statistically between groups using ANOVA.

Results: The results indicated enhanced serum CK and ALP levels in all groups compared with control (P < 0.05). Also, there was a significant difference in serum CK levels between all the groups including different types or multiplicity of stress (P < 0.05). Serum ALP levels were found less affected by these factors; where darkness or immobilization have shown semi-equal effect on these enzyme levels with no significant difference. Besides, under darkness immobilized waterpipe smoking, ALP levels have no significant difference compared to immobilized waterpipe smoking or under darkness stress waterpipe smoking animals.

Conclusions: Our findings clearly indicate a synergistic effect of waterpipe smoke, immobilization and darkness stress on serum CK levels, whereas serum ALP levels of experimental groups have shown no significant synergism for the mentioned factors.

Keywords

Smoking Immobilization Darkness Creatine Kinase Alkaline Phosphatase Rats

Copyright © 2015, Thrita. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.

1. Background

World health organization considered smoking, especially waterpipe or tobacco smoking as a global threat (1). Many studies have been conducted on smoking effects on people’s health (2). Research has shown that tobacco smoke contains over 4800 different chemicals which 69 of them are carcinogenic and some contribute to tumor progression (3). Studies indicate that there is an association between smoking and respiratory tract, lung, stomach, liver, kidneys and urinary tract malignancies or myeloid leukemia (4).

On the other hand, creatin kinase (CK) is an enzyme which participates in energy use and storage cycle of tissue, especially in muscles and quickly provides the energy for endothermic processes (5). It is normal to have a low CK level in blood; however, its highest level has been found in skeletal muscle, brain and heart tissue (6). Several factors such as heavy exercise, muscle injury, chronic renal failure, lung disease and severe respiratory muscle activity may affect serum CK level (7). Many studies indicate that smoking would predispose to heart disease (8). Researchers have found a significant association between smoking and alterations in heart and brain biochemical enzyme activity (9).

Alkaline phosphatase (ALP) is a membrane hydrolase enzyme which transfers phosphate group from many types of molecules, such as nucleotides, proteins and alkaloids (10). The main function of ALP is probably to facilitate exchange of metabolites through the cell membrane in transport and storage of fat and osteogenesis (11). Although this enzyme is active in most tissues, the highest enzyme activities have been found in intestines, liver, bone, spleen, placenta and kidney (12). Studies indicate that ALP activity which is one of the liver and bone disorder markers apparently alters in many diseases, including autoimmune diseases, some infectious diseases, liver, bone and biliary diseases, inflammation, anemia and malnutrition (13). Many studies suggest that there is an association between smoking and liver disease (14). Although it is supposed that smoking can affect the body biochemical enzyme levels, especially in liver tissue (15), some of the results showed no significant changes in liver enzyme levels (16), especially ALP activity (17). Also, some researches indicated that smoking can affect the morphology and anatomy of the liver and other organs (18).

Immobilization is one of the most common performed stresses on animals and among the various stress models, acute or chronic immobilization has been used extensively and accepted widely for studying the association between stress and physiological alterations (19); however, the exact pathophysiological mechanism is unknown (20). In this regard, some studies indicate that there is an association between stress and some serum enzyme activities (21).

Moreover, people are less exposed to light due to modern lifestyle and this phenomenon has effects on body physiology as a stress type; however, the exact mechanism is unknown (22). Research suggest that there is an association between darkness stress and excretory function of certain glands and organs (23). Darkness stress may induce depression of cell-mediated immunity in mice (24). At the molecular level, environmental lighting might regulate the expression of some enzyme genes (25, 26); indeed, it may regulate gene expression. Most of the researches on darkness stress have been conducted on long-term or acute darkness and there are few studies in the context of short-term or chronic darkness (27). Besides, studies indicate that female rats are more sensitive than males to the changes in photoperiod (28).

2. Objectives

Although there are various studies on the effects of smoking on enzyme levels, there is limited comparative research conducted on females, although, emerging epidemic of tobacco use among women is obvious (29). In this regards, considering more sensitivity of female rats to darkness stress (28) and due to the lack of motion in modern lifestyle, our study aimed to examine the multiplicity or comparative effects of waterpipe smoking, immobilization and darkness stress on serum CK and ALP levels in female rats. The results of this study have an important role in measures of health, prevention of tobacco use and choosing a more appropriate lifestyle through the new findings added to basic knowledge of health and disease.

3. Materials and Methods

3.1. Animals

Adult male Wistar rats, weighting 190 ± 10 g, were purchased and raised in our colony from an original stock of Pasteur institute (Tehran, Iran). The temperature was at 20°C - 25°C and animals kept under a schedule of 12 hours light:12 hours darkness (light on at: 8:00 AM) with free access to water and standard laboratory chow. Care was taken to examine the animals for general pathological symptoms. Food was withheld for 12 - 14 hours before operation or death. In all experiments, attention was paid to the regulation of local authorities for handling laboratory animals and the ethical guidelines for investigation of immobilization or darkness stress in rats (30).

3.2. Study Design

This work was conducted in laboratory complex of Islamic Azad University of Shahr Rey (Tehran, Iran). Animals were randomly divided into 8 groups, including control, waterpipe smoking, chronically immobilized, under darkness stress, immobilized waterpipe smoking, under darkness stress waterpipe smoking, under darkness stress immobilized and under darkness stress immobilized waterpipe smoking of 7 each.

In the present study, restrainer device was used for immobilizing. According to previous studies (31, 32), immobilization stress was performed as follows: animals were exposed to chronic immobilization stress for 4 hours/day (twice a day for 2 hours with 2 hours resting time among them) for a period of 7 weeks. To perform darkness stress, animals were in dark situation for 6 hours/day during a period of 7 weeks according to our previous experiment (33). A smoking chamber was designed to expose animals to tobacco smoke (33). This device was composed of the following parts, vacuum, smoke compressor cylinder in a glass box (aquarium) and an air conditioner on the top for ventilation. Initially, the rats entered the glass chamber, then tobacco was burned and suction was started simultaneously. When all the tobacco was burned, suction was automatically disconnected, beginning to transfer dense smoke into the glass chamber over the course of 15 minutes, including 10 minutes of smoking and exposure to smoke (indeed, condensation of smoke took a minute and animals were exposed to smoke for 9 minutes) and 5 minutes of resting time. This process was repeated 10 times per day which resulted in 90 minutes of tobacco smoke each day of 7 weeks experiment. Control animals were at the same position without any smoke.

3.3. Creatin Kinase and Alkaline Phosphatase Assay

Blood samples were collected using the cardiac puncture technique after anesthetizing animals by ether. Following serum collection, CK and ALP levels were determined using the spectrophotometry method.

3.4. Statistical Analysis

All results are presented as mean ± SD. The significance of differences between groups was determined by analysis of variance (ANOVA). Games-Howell and Tukey tests were used for post-hoc comparisons. Differences were considered significant when P < 0.05.

4. Results

Table 1 represents serum CK and ALP levels, respectively in different groups of our study including, control, waterpipe smoking, chronic immobilized, under darkness stress, immobilized waterpipe smoking, under darkness stress waterpipe smoking, under darkness stress immobilized and under darkness stress immobilized waterpipe smoking female Wistar rats.

Table 1. Serum Creatin Kinase and Alkaline Phosphatase Levels in Control and Experimental Groupsa
AnimalsCK, U/LbP ValuecALP, U/LbP Valuec
Control160.00 ± 2.16-81.45 ± 2.08-
Waterpipe smoking526.42 ± 4.51< 0.05112.00 ± 2.16< 0.05
Chronically immobilized379.40 ± 4.03< 0.05102.00 ± 2.17< 0.05
Under darkness stress292.30 ± 3.90< 0.0599.84 ± 3.20< 0.05
Immobilized waterpipe smoking853.20 ± 2.18< 0.05127.46 ± 8.42< 0.05
Under darkness stress waterpipe smoking710.35 ± 2.26< 0.05125.00 ± 6.55<0.05
Under darkness stress immobilized610.04 ± 1.98< 0.05120.52 ± 3.42< 0.05
Under darkness stress immobilized waterpipe smoking932.04 ± 2.02< 0.05132.00 ± 2.64< 0.05

aAbbreviations: CK, creatine kinase; ALP, alkaline phosphatase.

bData represent the mean ± SD of 7 rats in each group.

cP values are versus control group.

Our findings indicated that there was no significant difference in serum CK and ALP levels of control nonsmoking animals in the smoking device compared to normal animals. Therefore, smoking method used in the experience had no significant impact on the results of our study.

Serum CK and ALP levels were significantly increased in all groups compared to control. Likewise, there was a significant difference in serum CK levels between all the groups, including different types or multiplicity of stress (P < 0.05).

Moreover, serum ALP level was increased in chronically immobilized or under darkness stress rats and showed a significant difference compared to other groups (P < 0.05), although there was no significant difference between these two groups. Furthermore, there was no significant difference in the serum ALP level of under darkness stress immobilized rats compared to immobilized or under darkness stress waterpipe smoking animals; however, it was significant compared to other groups (P < 0.05). Besides, in comparison with under darkness stress immobilized waterpipe smoking animals, there was a significant difference in ALP levels of under darkness stress immobilized or the other groups except immobilized or under darkness stress waterpipe smoking rats, which had no significant difference compared to the three diverse stress group.

5. Discussion

Our findings clearly indicate that waterpipe smoking, immobilization or darkness stress increases the serum CK and ALP level in female rats. However, waterpipe smoking was found to have the most powerful impact on these factors. As there are significant differences in serum CK levels between all the groups, including different types or multiplicity of stress, the type and frequency of the stress factors are very influential in the CK level. Indeed, this factor may alter in different life styles or stress situations. According to our study, the serum ALP level was found less affected by the type, mild stress compared to the CK level, although all experimental groups have shown enhanced ALP levels compared to control. Indeed, darkness or immobilization has shown semi-equal effect on ALP levels. Also, under darkness immobilized waterpipe smoking rats have the ALP level similar to immobilized waterpipe somoking or under darkness stress waterpipe smoking animals. In this regard, there are reports suggesting a significant decrease in liver weight and liver enzyme alteration in mice exposed to cigarette smoke (34). Moreover, smoking is a leading cause of heart disease and cardiac enzyme changes (35). In contrast, some studies have shown that smoking has no effect on some liver enzyme levels (36). Also, there are studies reporting even better recovery of smokers with acute myocardial infarction and lower mortality rate among them compared to nonsmokers (37, 38). However, consistent with our findings, there are studies which suggest enhanced plasma enzymes such as CK, lactate dehydrogenase and glutamic-pyruvic transaminase activity in rats following cold immobilization stress (39), immersion restraint stress (40) or restraint and isolation stress (41). Our findings are consistent with studies indicating chemical enzyme activity alterations in light or dark rearing environment (42, 43). Also, some enzyme levels have reported to vary during dark or light period (44). However, there are very few and conflicting experiments on this issue. The main mode of mechanism of action, however, in one hand, can be thought to be on the cell damage and cytoplasmic enzymes leakage into the blood following increased cell membrane permeability. Indeed, hookah smoke and stress may cause free radical production, which can damage cell membrane through fatty acids peroxidation leading to enzyme release in plasma (45). Besides, it is well accepted that stress stimulates the activity of the autonomic nervous system (46) which probably participates in stress-induced increase in plasma enzyme activities.

In conclusion, the results indicate a synergistic effect of waterpipe smoke, immobilization and darkness stress on serum ALP and CK levels. Therefore, pathophysiological consequences of these factors are very important, particularly in heart and liver tissue.

Acknowledgements

Footnotes

References

  • 1.

    Maziak W, Taleb ZB, Bahelah R, Islam F, Jaber R, Auf R, et al. The global epidemiology of waterpipe smoking. Tob Control. 2015; 24 Suppl 1[DOI][PubMed]

  • 2.

    Alberg AJ, Shopland DR, Cummings KM. The 2014 Surgeon General's report: commemorating the 50th Anniversary of the 1964 Report of the Advisory Committee to the US Surgeon General and updating the evidence on the health consequences of cigarette smoking. Am J Epidemiol. 2014; 179(4) : 403 -12 [DOI][PubMed]

  • 3.

    Wang GZ, Cheng X, Li XC, Liu YQ, Wang XQ, Shi X, et al. Tobacco smoke induces production of chemokine CCL20 to promote lung cancer. Cancer Lett. 2015; 363(1) : 60 -70 [DOI][PubMed]

  • 4.

    Liu M, Poo WK, Lin YL. Pyrazine, 2-ethylpyridine, and 3-ethylpyridine are cigarette smoke components that alter the growth of normal and malignant human lung cells, and play a role in multidrug resistance development. Exp Mol Pathol. 2015; 98(1) : 18 -26 [DOI][PubMed]

  • 5.

    Ely M, Romero S, Sieck D, Luttrell M, Halliwill J. Histamine Receptor Blockade Does Not Increase Creatine Kinase Concentrations Following Muscle Damaging Exercise. The FASEB Journal. 2015; 29(1 Supplement) : 822.1

  • 6.

    Bresnen A, Duong TQ. Brain high-energy phosphates and creatine kinase synthesis rate under graded isoflurane anesthesia: An in vivo (31) P magnetization transfer study at 11.7 tesla. Magn Reson Med. 2015; 73(2) : 726 -30 [DOI][PubMed]

  • 7.

    Ha MS, Baek YH, Kim JW, Kim DY. Effects of yoga exercise on maximum oxygen uptake, cortisol level, and creatine kinase myocardial bond activity in female patients with skeletal muscle pain syndrome. J Phys Ther Sci. 2015; 27(5) : 1451 -3 [DOI][PubMed]

  • 8.

    Singh K, Kaur S, Arora R. Status of Certain Oxidative Stress Markers in Ischemic Heart Disease Patients with and Without Smoking in North Indian Punjabi Population. Adv Biomed Bull. 2015; 3(2) : 225 -31

  • 9.

    Lapenna D, Ciofani G, Ucchino S, Giamberardino MA, Di Ilio C, Cuccurullo F. Reactive aldehyde-scavenging enzyme activities in atherosclerotic plaques of cigarette smokers and nonsmokers. Atherosclerosis. 2015; 238(2) : 190 -4 [DOI][PubMed]

  • 10.

    Barrozo A, Duarte F, Bauer P, Carvalho AT, Kamerlin SC. Cooperative Electrostatic Interactions Drive Functional Evolution in the Alkaline Phosphatase Superfamily. J Am Chem Soc. 2015; 137(28) : 9061 -76 [DOI][PubMed]

  • 11.

    Dabaja AA, Bryson CF, Schlegel PN, Paduch DA. The effect of hypogonadism and testosterone-enhancing therapy on alkaline phosphatase and bone mineral density. BJU Int. 2015; 115(3) : 480 -5 [DOI][PubMed]

  • 12.

    Poupon R. Liver alkaline phosphatase: a missing link between choleresis and biliary inflammation. Hepatology. 2015; 61(6) : 2080 -90 [DOI][PubMed]

  • 13.

    Sebastian-Serrano A, de Diego-Garcia L, Martinez-Frailes C, Avila J, Zimmermann H, Millan JL, et al. Tissue-nonspecific Alkaline Phosphatase Regulates Purinergic Transmission in the Central Nervous System During Development and Disease. Comput Struct Biotechnol J. 2015; 13 : 95 -100 [DOI][PubMed]

  • 14.

    Zabala V, Tong M, Yu R, Ramirez T, Yalcin EB, Balbo S, et al. Potential contributions of the tobacco nicotine-derived nitrosamine ketone (NNK) in the pathogenesis of steatohepatitis in a chronic plus binge rat model of alcoholic liver disease. Alcohol Alcohol. 2015; 50(2) : 118 -31 [DOI][PubMed]

  • 15.

    Fujimoto H, Tsuji H, Okubo C, Fukuda I, Nishino T, Lee KM, et al. Biological responses in rats exposed to mainstream smoke from a heated cigarette compared to a conventional reference cigarette. Inhal Toxicol. 2015; 27(4) : 224 -36 [DOI][PubMed]

  • 16.

    Shen H, Shahzad G, Mustacchia P. Su1054 Smoking Is Not Associated With Nonalcoholic Fatty Liver Disease: A Population-Based Study From the National Health and Nutrition Examination Survey, 2001-2006. Gastroenterology. 148(4) -1051 [DOI]

  • 17.

    Hermann AP, Brot C, Gram J, Kolthoff N, Mosekilde L. Premenopausal smoking and bone density in 2015 perimenopausal women. J Bone Miner Res. 2000; 15(4) : 780 -7 [DOI][PubMed]

  • 18.

    Wisniewska E, Dylik A, Kulza M, Florek E, Piekoszewski W, Senczuk-Przybylowska M, et al. Exposure to ethanol and tobacco smoke in relation to level of PCNA antigen expression in pancreatic and hepatic rat cells. Pharmacol Rep. 2013; 65(4) : 914 -26 [PubMed]

  • 19.

    Nostramo R, Serova L, Laukova M, Tillinger A, Peddu C, Sabban EL. Regulation of nonclassical renin-angiotensin system receptor gene expression in the adrenal medulla by acute and repeated immobilization stress. Am J Physiol Regul Integr Comp Physiol. 2015; 308(6) -29 [DOI][PubMed]

  • 20.

    Colin-Gonzalez AL, Becerril H, Flores-Reyes BR, Torres I, Pinzon E, Santamaria-Del Angel D, et al. Acute restraint stress reduces hippocampal oxidative damage and behavior in rats: Effect of S-allyl cysteine. Life Sci. 2015; 135 : 165 -72 [DOI][PubMed]

  • 21.

    Cline BH, Anthony DC, Lysko A, Dolgov O, Anokhin K, Schroeter C, et al. Lasting downregulation of the lipid peroxidation enzymes in the prefrontal cortex of mice susceptible to stress-induced anhedonia. Behav Brain Res. 2015; 276 : 118 -29 [DOI][PubMed]

  • 22.

    Escribano BM, Diaz-Moreno A, Tasset I, Tunez I. Impact of light/dark cycle patterns on oxidative stress in an adriamycin-induced nephropathy model in rats. PLoS One. 2014; 9(5)[DOI][PubMed]

  • 23.

    Kokoshchuk HI, Kushnir IH. [Effect of constant darkness on circadian rhythm of the kidney excretory function in white rats]. Fiziol Zh. 2005; 51(1) : 84 -7 [PubMed]

  • 24.

    Bubak-Satora M, Skowron-Cendrzak A, Kubera M, Holan V. Protective effect of lithium on the stress-induced depression of cell-mediated immunity in mice. Int J Immunopharmacol. 1994; 16(3) : 233 -7 [PubMed]

  • 25.

    Slepak VZ, Pronin A, Levay K, Wang Q, Velmeshev D, Faghihi M, et al. Inhibition of transducin GTPase shifts global gene expression in the mouse retina. Invest. Ophthalmol. Visual Sci. 2014; 55(13) : 3031

  • 26.

    Guerlotte J, Voisin P, Bernard M, Brisson P, Falcon J, Blasquez JL, et al. Long-term effects of constant light or darkness on chicken pineal hydroxyindole-O-methyltransferase expression: biochemical and cellular aspects. Cell Mol Neurobiol. 1992; 12(2) : 177 -84 [PubMed]

  • 27.

    Van der Meer E, Van Loo PL, Baumans V. Short-term effects of a disturbed light-dark cycle and environmental enrichment on aggression and stress-related parameters in male mice. Lab Anim. 2004; 38(4) : 376 -83 [PubMed]

  • 28.

    Anishchenko TG, Golovacheva II, Pronina SV, Shorina LN. [Sexual dimorphism in reactions to stress during regular and altered photoperiods]. Biull Eksp Biol Med. 1988; 106(7) : 21 -3 [PubMed]

  • 29.

    Saeed Firoozabadi M, Tahmasebi R, Noroozi A. Predicting Factors on Continued Intention of Waterpipe Smoking Among Women in Bushehr Using the Theory of Planned Behavior. Iran J Health Educ Health Promot. 2015; 2(4) : 260 -9

  • 30.

    Harriss DJ, Atkinson G. Ethical standards in sport and exercise science research: 2014 update. Int J Sports Med. 2013; 34(12) : 1025 -8 [DOI][PubMed]

  • 31.

    Pol O, Campmany L, Gil M, Armario A. Behavioral and neurochemical changes in response to acute stressors: influence of previous chronic exposure to immobilization. Pharmacol Biochem Behav. 1992; 42(3) : 407 -12 [PubMed]

  • 32.

    Ahmadi R, Molaei S. The Effects of Co-administration of Immobilization Stress and Aloe vera on Serum Carcinoembryonic Antigen in Rats. Zahedan J Res Med Sci. 2015; 17(3)[DOI]

  • 33.

    Rajpurkar A, Li H, Dhabuwala CB. Morphometric analysis of rat testis following chronic exposure to cigarette smoke. J Environ Pathol Toxicol Oncol. 2000; 19(4) : 363 -8 [PubMed]

  • 34.

    Omotoso GO, Enaibe BU, Akinola OB, Kadir RE, Akinlolu AA, Oyewopo AO, et al. Lipid Profile and Liver Histochemistry in Animal Models Exposed to Cigarette Smoke. J. Basic Appl. Sci. 2012; 8(1) : 20 -5

  • 35.

    Nakagawa K, Hirai T, Ohara K, Fukuda N, Numa S, Taguchi Y, et al. Impact of persistent smoking on long-term outcomes in patients with nonvalvular atrial fibrillation. J Cardiol. 2015; 65(5) : 429 -33 [DOI][PubMed]

  • 36.

    Jang ES, Jeong SH, Hwang SH, Kim HY, Ahn SY, Lee J, et al. Effects of coffee, smoking, and alcohol on liver function tests: a comprehensive cross-sectional study. BMC Gastroenterol. 2012; 12 : 145 [DOI][PubMed]

  • 37.

    Barbash GI, Reiner J, White HD, Wilcox RG, Armstrong PW, Sadowski Z, et al. Evaluation of paradoxic beneficial effects of smoking in patients receiving thrombolytic therapy for acute myocardial infarction: mechanism of the "smoker's paradox" from the GUSTO-I trial, with angiographic insights. Global Utilization of Streptokinase and Tissue-Plasminogen Activator for Occluded Coronary Arteries. J Am Coll Cardiol. 1995; 26(5) : 1222 -9 [PubMed]

  • 38.

    Ferreira R. [The paradox of tobacco. Smokers have a better post-infarct prognosis]. Rev Port Cardiol. 1998; 17(10) : 855 -6 [PubMed]

  • 39.

    Meltzer HY. Plasma creatine phosphokinase activity, hypothermia, and stress. Am J Physiol. 1971; 221(3) : 896 -901 [PubMed]

  • 40.

    Arakawa H, Kodama H, Matsuoka N, Yamaguchi I. Stress increases plasma enzyme activity in rats: differential effects of adrenergic and cholinergic blockades. J Pharmacol Exp Ther. 1997; 280(3) : 1296 -303 [PubMed]

  • 41.

    Apple JK, Minton JE, Parsons KM, Unruh JA. Influence of repeated restraint and isolation stress and electrolyte administration on pituitary-adrenal secretions, electrolytes, and other blood constituents of sheep. J Anim Sci. 1993; 71(1) : 71 -7 [PubMed]

  • 42.

    Chanut E, Nguyen-Legros J, Labarthe B, Trouvin JH, Versaux-Botteri C. Serotonin synthesis and its light-dark variation in the rat retina. J Neurochem. 2002; 83(4) : 863 -9 [PubMed]

  • 43.

    Castelhano-Carlos MJ, Baumans V. The impact of light, noise, cage cleaning and in-house transport on welfare and stress of laboratory rats. Lab Anim. 2009; 43(4) : 311 -27 [DOI][PubMed]

  • 44.

    Lee EJ, Gibo TL, Grzywacz NM. Dark-rearing-induced reduction of GABA and GAD and prevention of the effect by BDNF in the mouse retina. Eur J Neurosci. 2006; 24(8) : 2118 -34 [DOI][PubMed]

  • 45.

    Ali BH, Adham SA, Al Balushi KA, Shalaby A, Waly MI, Manoj P, et al. Reproductive toxicity to male mice of nose only exposure to water- pipe smoke. Cell Physiol Biochem. 2015; 35(1) : 29 -37 [DOI][PubMed]

  • 46.

    Dieleman GC, Huizink AC, Tulen JH, Utens EM, Creemers HE, van der Ende J, et al. Alterations in HPA-axis and autonomic nervous system functioning in childhood anxiety disorders point to a chronic stress hypothesis. Psychoneuroendocrinology. 2015; 51 : 135 -50 [DOI][PubMed]

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