: Effects of heat stress on somatostatin and some related immune factors in the small intestine of Wenchang chicks. Czech J. Anim. Sci., 62,[446][447][448][449][450][451][452][453][454][455] To investigate the effects of heat stress (HS) on developmental changes in immune functions of chick intestinal mucosa, one-day-old broiler chicks were randomly assigned into control check (CK) and heat-stressed (HS) groups and raised under indoor temperature. The chicks in HS group were subjected to HS at 40 ± 0.5°C from 12:00 to14:00 h every day. Intestinal mucosa samples were collected weekly during 6 weeks, and the effects of HS on somatostatin and its related immune factors were examined using immunohistochemical, physiological, and biochemical methods. The results showed that HS obviously increased the amount and integral optical density of somatostatin positive cells, somatostatin content, as well as IFN-γ and IL-2 levels in the small intestine, and these increases reached statistical significance in some intestinal segments (P < 0.05). In addition, IgG, IgA, and IgM levels fluctuated in different intestinal segments and their levels in jejunum, duodenum, and ileum in 6-week-old chicks were significantly lower in HS group than in CK group (P < 0.05). The contents of immune-related enzymes also fluctuated, but the activities of acid phosphatase, lysozyme, and glutathione reductase in duodenum and jejunum were lower in 6-week-old chicks in HS group than in CK group, some reaching statistical significance (P < 0.05). Growth hormone (GH) and HSP70 contents in multiple intestinal segments in 6-week-old chicks were significantly higher in HS group than in CK group (P < 0.05). The results indicate that (1) HS could increase the expression and secretion of somatostatin and affect the normal development of immunoglobulins, cytokines, and immune-related enzymes in the small intestine, and thereby impact the chicks' intestine immune function; (2) GH and HSP70 in the small intestine were involved in self-protection mechanisms against HS-induced intestinal injury and somatostatin regulation might be one of the important components.
Radiolabeled somatostatin analogue is a useful ligand for scintigraphic imaging of somatostatin receptor-bearing tumors. In this study, we investigated the effects of different radiolabeling conditions on labeling yield and ratio between mono-iodinated and di-iodinated 125I Tyl 3-octreotide by HPLC analysis. In vitro and in vivo stabilities of 125I Tyr3-octreotide and 11 lin_DTPA_D_Phel_octreotid e were also determined. Both radiolabeled compounds were relatively stable in vitro, but were decomposed to free 125I and 11 lin_DTP A in vivo, respectively.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.