Abstract:
:Almost all physiological processes within the organism, including immune parameters and hormones, follow a circadian rhythm. These daily fluctuations are often observed in free-living organisms; however, little is known regarding hormonal and immune daily variations in anurans, particularly under laboratory conditions. This study aimed to investigate the hormonal and immune daily variation in captive-bred Bullfrogs (Lithobates catesbeianus) under constant conditions (21 °C and 12:12 LD cycle). Our results showed a daily variation for plasma corticosterone (CORT), testosterone (T), and melatonin (MEL), as well as for blood leukocyte profile, phagocytic activity, and plasma bacterial killing ability (BKA). Hormonal profile and immune activity were higher at the dark when compared with the light phase; however, monocytes and lymphocytes followed the opposite pattern. Moreover, CORT was positively correlated with phagocytosis percentage of blood cells, BKA, and monocytes, while MEL and T showed a positive correlation with PP. Our results demonstrate the daily covariation of different immune variables and immunomodulatory hormones. These 24 h-day variations and covariation certainly have broad implications and need to be considered for better understanding anuran physiology both in the context of laboratory and field studies.
journal_name
Gen Comp Endocrinoljournal_title
General and comparative endocrinologyauthors
Titon SCM,Titon Junior B,Assis VR,Vasconcelos-Teixeira R,Garcia Neto PG,Lima AS,Ferreira LF,Fernandes PA,Gomes FR,Markus RPdoi
10.1016/j.ygcen.2020.113702subject
Has Abstractpub_date
2020-12-20 00:00:00pages
113702eissn
0016-6480issn
1095-6840pii
S0016-6480(20)30455-Xjournal_volume
303pub_type
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