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The Effect of Photoperiod Duration on Humoral Innate and Humoral Adaptive Immune Responsiveness in Campbell’s Hamster
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The Effect of Photoperiod Duration on Humoral Innate and Humoral Adaptive Immune Responsiveness in Campbell’s Hamster
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Journal Article
The Effect of Photoperiod Duration on Humoral Innate and Humoral Adaptive Immune Responsiveness in Campbell’s Hamster
2023
Overview
We studied the humoral innate immune responsiveness (HII), i.e., the hemolysis of rabbit erythrocytes by complement proteins, the adaptive humoral (antibody production) immune responsiveness (AHI) to intraperitoneal injection of sheep red blood cells, the morphological and hormonal reproductive characteristics and stress level (blood cortisol) in male Campbell’s hamsters kept under long-day (LD; 16D: 8N) and short-day (SD; 8D: 16N) photoperiods. In SD males we found the body mass, anogenital distance, midventral gland size, and level of testosterone in the peripheral blood (but not the cortisol level) decreased after two months of exposure. The results indicate lower HII, but not AHI in SD. Comparison of the SD nonresponders, SD responders, and LD individuals demonstrated a statistically significant increase of HII in SD photosensitive hamsters compared to LD. There was no link between HII and AHI, which indicates an independent photoperiodic responsiveness of different branches of the immune system.
