General and Comparative Endocrinology This is an RSS file. You can use it to subscribe to this data in your favourite RSS reader or to display this data on your own website or blog.

Allatotropic peptides modulate muscle contraction of the female reproductive system in Rhodnius prolixus (ST ÄL)
Gen Comp Endocrinol. 2023 Aug 9;343:114358. doi: 10.1016/j.ygcen.2023.114358. Online ahead of print.ABSTRACTAllatotropin (AT) acts as a myoregulator at the level of the dorsal vessel (DV) and midgut (MG) in triatominae insects. Previous analyses of the expression of the AT receptor in Rhodnius prolixus showed that AT is expressed in the DV and MG, but also in the reproductive system in females. To further study the activity of AT on female reproductive organs we analyzed the response by adult females in different physiological conditions, including unfed (virgin and mated), and fed mated females (gravid), to doses ranging ...
Source: General and Comparative Endocrinology - August 11, 2023 Category: Endocrinology Authors: Mar ía José Villalobos Sambucaro Cristian Pacheco Jorge Rafael Ronderos Source Type: research

Allatotropic Peptides Modulate Muscle Contraction Of The Female Reproductive System in Rhodnius Prolixus (ST ÄL)
Gen Comp Endocrinol. 2023 Aug 9:114358. doi: 10.1016/j.ygcen.2023.114358. Online ahead of print.ABSTRACTAllatotropin (AT) acts as a myoregulator at the level of the dorsal vessel (DV) and midgut (MG) in triatominae insects. Previous analyses of the expression of the AT receptor in Rhodnius prolixus showed that AT is expressed in the DV and MG, but also in the reproductive system in females. To further study the activity of AT on female reproductive organs we analyzed the response by adult females in different physiological conditions, including unfed (virgin and mated), and fed mated females (gravid), to doses ranging betw...
Source: General and Comparative Endocrinology - August 11, 2023 Category: Endocrinology Authors: Mar ía José Villalobos Sambucaro Cristian Pacheco Jorge Rafael Ronderos Source Type: research

Functional characterization of melanocortin 2 receptor (Mc2r) from a lobe-finned fish (Protopterus annectens) and insights into the molecular evolution of melanocortin receptors
Gen Comp Endocrinol. 2023 Aug 8:114356. doi: 10.1016/j.ygcen.2023.114356. Online ahead of print.ABSTRACTRecent studies from our group on melanocortin 2 receptors (Mc2r) from basal families of actinopterygians have served to resolve that Mrap1 dependence and ACTH selectivity are features of even the most basal ray-finned fishes. However, there have been no studies on Mc2r function of the basal sarcopterygians, the lobe-finned fishes, represented by the extant members coelacanths and lungfishes. Here, we offer the first molecular and functional characterization of an Mc2r from a lobe-finned fish, the West African lungfish (P...
Source: General and Comparative Endocrinology - August 10, 2023 Category: Endocrinology Authors: Ciaran A Shaughnessy Khoa Le Valorie D Myhre Robert M Dores Source Type: research

Vasotocin expression is associated with social preference development of the medaka fish
Gen Comp Endocrinol. 2023 Aug 8:114355. doi: 10.1016/j.ygcen.2023.114355. Online ahead of print.ABSTRACTThe neurohypophysial peptide arginine vasotocin (VT) and its mammalian ortholog, arginine vasopressin, function in physiological and behavioral events. These functions have been identified in neuroendocrinological studies using adult animals; however, there is little information on whether VT is associated with social behavior development in fish. Here, we examined social preference in medaka fish of various ages and investigated how VT expression changes during development. The 1-, 2-, 4-, and 8-week post-hatching (wph)...
Source: General and Comparative Endocrinology - August 10, 2023 Category: Endocrinology Authors: Hanae Tanaami Saki Yamamoto Suzuna Hayashi Sumika Kawamoto Hiroki Makino Nao Kagawa Source Type: research

The influence of the opioid pentapeptide methionine-enkephalin on seasonal and FSH-induced ovarian recrudescence in the gecko Hemidactylus frenatus
This study aims to elucidate the role of M-ENK on seasonal and follicle stimulating hormone (FSH)-induced ovarian recrudescence in the gecko Hemidactylus frenatus. In the first experiment, administration of 5 µg M-ENK did not affect germinal bed activity or follicular developmental stages I, II, and III (previtellogenic) and IV (vitellogenic), but there were no stage V (vitellogenic) follicles in the ovary. However, there was a significant decrease in the mean numbers of oogonia and primary oocytes in the germinal bed associated with the complete absence of stage IV and V follicles in 25 µg M-ENK-treated lizards in contr...
Source: General and Comparative Endocrinology - August 3, 2023 Category: Endocrinology Authors: Ananya Ganeyan C B Ganesh Source Type: research

An empirical comparison of several commercial enzyme immunoassays for the non-invasive assessment of adrenocortical and gonadal function in mountain gorillas
Gen Comp Endocrinol. 2023 Jul 31;342:114351. doi: 10.1016/j.ygcen.2023.114351. Online ahead of print.ABSTRACTWildlife researchers seeking to non-invasively examine endocrine function in their study species are presented with a dense and technical 'garden of forking paths' to navigate between collecting a biological sample and obtaining a final measurement. In particular, the choice of which enzyme immunoassay (EIA) to use with collected fecal samples, out of the many options offered by different manufacturers and research laboratories, may be one of the most consequential for final results. However, guidance for making thi...
Source: General and Comparative Endocrinology - August 2, 2023 Category: Endocrinology Authors: Nicholas M Grebe Winnie Eckardt Tara S Stoinski Rose Umuhoza Rachel M Santymire Stacy Rosenbaum Source Type: research