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A comparison of seasonal flexibility in pectoralis muscle fiber type and enzyme activity in migratory and resident sparrow species.
J Exp Biol
January 2025
Department of Biology, Western University, London, Ontario, Canada.
The pectoralis muscle in birds is important for flight and thermogenesis. In migratory songbirds this muscle exhibits seasonal flexibility in size, but whether this flexibility reflects changes in muscle fiber type has not been well documented. We investigated how seasonal changes in photoperiod affected pectoralis muscle fiber type and metabolic enzymes, comparing among three closely-related sparrow species: two seasonal migrants and one year-round, temperate climate resident.
View Article and Find Full Text PDFImmunization with OPN5 increased seasonal degradation of reproductive activity in Magang ganders.
Poult Sci
January 2025
College of Animal Science and Technology, Hunan Agricultural University, Changsha 410128, China. Electronic address:
To investigate the regulatory mechanism mediated by hypothalamic OPN5 on seasonal changes in the reproductive activities of domestic geese, 60 Magang ganders in their breeding period were selected for the experiment and evenly divided into an immunization group(OPN5-IM) and a control group. On days 0, 15 and 30, ganders in the immunized group were immunized with OPN5-KLH protein vaccine, and ganders in the control were immunized with the same amount of blank emulsified vaccine. Additionally, 120 female geese were provided to stimulate the reproductive activities of male geese.
View Article and Find Full Text PDFPupillary response to blue light as a biomarker of seasonal pattern in Major Depressive Episode: A clinical study using pupillometry.
Psychiatry Res
December 2024
Département de psychiatrie et d'addictologie, AP-HP, GHU Paris Nord, DMU Neurosciences, Hôpital Bichat - Claude Bernard, F-75018 Paris, France; Université Paris Cité, NeuroDiderot, Inserm, FHU I2-D2, F-75019 Paris, France; Centre ChronoS, GHU Paris - Psychiatrie & Neurosciences, 1 rue Cabanis, 75014 Paris, France; CNRS UPR 3212 & Strasbourg University, Institute for Cellular and Integrative Neurosciences, F-67000, Strasbourg, France. Electronic address:
Depressive disorders are characterized by disturbances in light signal processing. More specifically, an alteration of the melanopsin response is suggested. The post-illumination pupillary response (PIPR) to blue light (post-blue PIPR) is increasingly used as a marker of the activity of intrinsically photosensitive melanopsin ganglion cells (ipRGCs).
View Article and Find Full Text PDFColdness or Darkness? Which Places Greater Stress on the Thyroid? Seasonal Changes in Thyroid-Stimulating Hormone and Thyroid Hormones.
J Clin Med
November 2024
Department of Endocrinology and Metabolism, Faculty of Medicine, Ankara Yildirim Beyazit University, Ankara 06800, Turkey.
Although seasonal changes were suggested to be among the many factors that affect thyroid functions, this issue is still controversial. In this study, we aimed to investigate the possible relationship between seasonal changes and thyroid function. We retrospectively scanned all thyroid-stimulating hormone (TSH), free triiodothyronine (FT3), and free thyroxine (FT4) values checked in our hospital between 2019 and 2023.
View Article and Find Full Text PDFSeasonal variation in sunlight exposure is differently associated with changes in T regulatory and T-helper 17 cell blood counts in adolescent and adults females: a pilot study.
Photochem Photobiol Sci
December 2024
Allergy Immunology, Murdoch Children's Research Institute, Royal Children's Hospital, Melbourne, VIC, Australia.
Higher prevalence of multiple sclerosis at higher latitudes is associated with reduced sunlight during childhood. Alterations in inflammatory Th17 and regulatory T cells (Treg) are associated with autoimmunity. In Hobart, Australia (latitude 42.
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