Beneficial Effects of Exogenous Melatonin in Acute Staphylococcus aureus and Escherichia coli Infection-Induced Inflammation and Associated Behavioral Response in Mice After Exposure to Short Photoperiod.
The administration of melatonin during acute bacterial infection was evaluated in this study. Mice pre-exposed to normal photoperiodic (NP), short photoperiodic (SP), and long photoperiodic (LP) day lengths were infected separately with live Staphylococcus aureus (5 × 106cells/ml) or Escherichia coli (2.5 × 107colony-forming units/ml) and treated with melatonin (10 mg/kg body weight). Behavioral studies were performed before bacterial infection and after melatonin administration. In mice pre-exposed to SP, exogenous melatonin administration resulted in better clearance of bacteria from blood and behavioral improvement. Reduced glutathione content and superoxide dismutase activities were increased, with concomitant decrease in lipid peroxidation content and catalase activities in the liver, brain, and spleen after exogenous melatonin administration. The overproduction of tumor necrosis factor-α, interferon-γ, and interleukin-6 during acute bacterial infection in mice exposed to different photoperiods was probably regulated by the administration of exogenous melatonin, by reducing neutrophil recruitment to spleen, expression of inducible nitric oxide synthase and cyclooxygenase-2 in hypothalamus, and C-reactive protein in the serum, and was also associated with improved behavioral response. Photoperiodic variations in inflammatory and oxidative stress markers might be correlated to serum melatonin and corticosterone levels. This study suggests that the administration of melatonin during SP exposure is protective in infection-induced inflammation than NP and LP exposure.
Department of Physiology, Immunology Laboratory, University of Calcutta, University Colleges of Science and Technology, 92 APC Road, Calcutta, 700009, West Bengal, India. biswa_dev2@yahoo.com.
Biswadev
B
Bishayi
Department of Physiology, Immunology Laboratory, University of Calcutta, University Colleges of Science and Technology, 92 APC Road, Calcutta, 700009, West Bengal, India.
Rana
R
Adhikary
Department of Physiology, Immunology Laboratory, University of Calcutta, University Colleges of Science and Technology, 92 APC Road, Calcutta, 700009, West Bengal, India.
Ajeya
A
Nandi
Department of Physiology, Immunology Laboratory, University of Calcutta, University Colleges of Science and Technology, 92 APC Road, Calcutta, 700009, West Bengal, India.
Sahin
S
Sultana
D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects*; D004927:Escherichia coli Infections / Q000188:drug therapy* / Q000473:pathology; D007249:Inflammation / Q000188:drug therapy* / Q000209:etiology / Q000382:microbiology; D008550:Melatonin / Q000008:administration & dosage* / Q000097:blood / Q000494:pharmacology; D051379:Mice; D017440:Photoperiod; D013203:Staphylococcal Infections / Q000188:drug therapy* / Q000473:pathology; D013997:Time Factors
D008550:Melatonin
antioxidants; bacterial infection; cytokines; inflammation; melatonin; photoperiod
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