Effect of streptozotocin-induced diabetes mellitus on serotonin measures of peripheral tissues in rats

Life Sciences ◽  
1994 ◽  
Vol 56 (1) ◽  
pp. 51-59 ◽  
Author(s):  
F.J. Marti´n ◽  
J.M. Mi´guez ◽  
M. Aldegunde ◽  
G. Atienza
1986 ◽  
Vol 113 (1_Suppl) ◽  
pp. S120-S121
Author(s):  
TH. LINN ◽  
H. GERMANN ◽  
B. HERING ◽  
R. BRETZEL ◽  
K. FEDERLIN

Author(s):  
Aleksandra Baska ◽  
Kamil Leis ◽  
Przemysław Gałązka

: Berberine is an alkaloid found in plants. It has e.g. neuroprotective, anti-inflammatory and hypolipidemic activity. The research proves that it also strongly impacts the carbohydrate metabolism. The compound also protects pancreatic βcells and increases sensitivity to insulin in peripheral tissues via the induction of GLUT-1, GLUT-4 and insulin type 1 (Ins1) receptors activity. It also stimulates glycolysis and leads to a decrease in insulin resistance by macrophages polarization, lipolytic processes induction and energy expenditure enhancement (by reducing body mass and limiting insulin resistance caused by obesity). In liver berberine inhibits FOX01, SREBP1 and ChREBP pathways, and HNF-4α (hepatocyte nuclear factor 4 alpha) mRNA that hinder gluconeogenesis processes. In intestines it blocks α-glucosidase contributing to glucose absorption decrease. Its interference in intestinal flora reduces levels of monosaccharides and suppresses diabetes mellitus complications development.


1994 ◽  
Vol 266 (2) ◽  
pp. E217-E223 ◽  
Author(s):  
D. Trinder ◽  
P. A. Phillips ◽  
J. M. Stephenson ◽  
J. Risvanis ◽  
A. Aminian ◽  
...  

Diabetes mellitus causes hypertonicity, increased plasma arginine vasopressin (AVP), polydipsia, and polyuria. Downregulation of AVP V2 receptors may contribute to the polyuria through diminished V2 receptor-mediated free water retention. After 2 wk of streptozotocin-induced diabetes mellitus, the diabetic rats had raised plasma glucose, AVP, and osmolality levels (P < 0.001) compared with nondiabetic controls (Sham). Insulin treatment (4 U long-acting insulin sc, daily) partially lowered these values (P < 0.01). There was a reduction in the number of renal and hepatic V1 receptors in the diabetic and diabetic+insulin animals compared with the sham animals (P < 0.05). The receptor affinity remained unchanged. In parallel, there was a reduction in maximum AVP-activated total inositol phosphate production in the liver and kidney of the diabetic and diabetic+insulin animals compared with the sham animals (P < 0.05). The density and affinity of renal V2 receptors and AVP-stimulated adenosine 3',5'-cyclic monophosphate production in the diabetic and diabetic+insulin animals were unchanged compared with the sham. These results demonstrate differential regulation of AVP receptors and suggest that downregulation of renal V2 receptors does not contribute to the polyuria of diabetes. In contrast, downregulation of V1 receptors might contribute to diminished V1 receptor-mediated biological responses to AVP seen in diabetes mellitus.


2017 ◽  
Vol 95 (11) ◽  
pp. 1343-1350
Author(s):  
Aleksandra Vranic ◽  
Stefan Simovic ◽  
Petar Ristic ◽  
Tamara Nikolic ◽  
Isidora Stojic ◽  
...  

Currently, cardiovascular diseases are the leading cause of global mortality, while diabetes mellitus remains an important cause of cardiovascular morbidity. A recent study showed that patients with diabetes mellitus treated with mineralocorticoid receptor antagonists have improved coronary microvascular function, leading to improved diastolic dysfunction. In this study, we evaluated the influence of acute administration of spironolactone on myocardial function in rats with streptozotocin-induced diabetes mellitus, with special emphasis on cardiodynamic parameters in diabetic rat hearts. The present study was carried out on 40 adult male Wistar albino rats (8 weeks old). Rats were randomly divided into 4 groups (10 animals per group): healthy rats treated with 0.1 μmol/L of spironolactone, diabetic rats treated with 0.1 μmol/L of spironolactone, healthy rats treated with 3 μmol/L of spironolactone, and diabetic rats treated with 3 μmol/L of spironolactone. Different, dose-dependent, acute responses of spironolactone treatment on isolated, working diabetic and healthy rat heart were observed in our study. In healthy rats, better systolic function was achieved with higher spironolactone dose, while in diabetic rats, similar effects of low and high spironolactone dose were observed.


1978 ◽  
Vol 56 (1) ◽  
pp. 48-53 ◽  
Author(s):  
N. Ogawa ◽  
T. Thompson ◽  
H. G. Friesen

The concentrations of a somatostatin-binding protein, found in the cytosol of a number of rat tissues, are similar in both sexes, and hypophysectomy has little or no effect on the level of binding protein in tissue extracts. On the other hand, streptozotocin-induced diabetes mellitus causes a modest decrease. The somatostatin-binding proteins obtained from extracts of several rat tissues are not only similar in molecular weight but also exhibit a similar isoelectric point and electrophoretic mobility. Agents that block thiol groups or prevent the formation of disulfide bridges markedly decrease the binding of somatostatin to the cytoplasmic protein. Studies using thiol reagents and gel filtration suggest that free thiol groups in somatostatin-binding protein are important for the binding of somatostatin.


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