Photoperiod history differentially impacts reproduction and immune function in adult Siberian hamsters.

Journal of Biological Rhythms
Brian J Prendergast, Leah M Pyter

Abstract

Seasonal changes in numerous aspects of mammalian immune function arise as a result of the annual variation in environmental day length (photoperiod), but it is not known if absolute photoperiod or relative change in photoperiod drives these changes. This experiment tested the hypothesis that an individual's history of exposure to day length determines immune responses to ambiguous, intermediate-duration day lengths. Immunological (blood leukocytes, delayed-type hypersensitivity reactions [DTH]), reproductive, and adrenocortical responses were assessed in adult Siberian hamsters (Phodopus sungorus) that had been raised initially in categorically long (15-h light/day; 15L) or short (9L) photoperiods and were subsequently transferred to 1 of 7 cardinal experimental photoperiods between 9L and 15L, inclusive. Initial photoperiod history interacted with contemporary experimental photoperiods to determine reproductive responses: 11L, 12L, and 13L caused gonadal regression in hamsters previously exposed to 15L, but elicited growth in hamsters previously in 9L. In hamsters with a 15L photoperiod history, photoperiods < or = 11L elicited sustained enhancement of DTH responses, whereas in hamsters with a 9L photoperiod history, DTH resp...Continue Reading

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Citations

Jul 22, 2011·Journal of Biological Rhythms·Brian J Prendergast
Aug 1, 2012·PloS One·Brian J Prendergast, Irving Zucker
Mar 29, 2014·Hormones and Behavior·Sean P Bradley, Brian J Prendergast
Mar 12, 2013·Brain, Behavior, and Immunity·Brian J PrendergastSean P Bradley
Dec 16, 2010·Frontiers in Neuroendocrinology·James C WaltonRandy J Nelson
Dec 3, 2014·Frontiers in Neuroendocrinology·Tyler J Stevenson, Brian J Prendergast
Apr 9, 2013·International Immunopharmacology·Fotios V MichelisEkaterini Tiligada
Jul 23, 2011·Neuroendocrinology·Sandrine M Dupré

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