Unlabelled: Bile acids, especially unconjugated deoxycholic acid, cause diarrhea by inducing colonic mucosal secretion of water and electrolytes. This effect has been shown to be mediated by adenylate cyclase (AC). Propranolol, a beta-adrenergic blocking agent which inhibits AC, may then prevent this action of bile acids on colonic mucosa. The aim of this study was to determine the effect of bile acids, catecholamines, and propranolol on AC activity in colonic mucosa. The in vitro effects of deoxycholic acid, taurocholic acid, NaF, epinephrine, norepinephrine, and propranolol on AC in rabbit colonic mucosa were determined. NaF, 10(-4) M, increased AC activity to 220% of control (P less than 0.01). Deoxycholic acid, 10(-4) M, increased AC activity to 178% of control (P less than 0.01). Lesser but significant (P less than 0.01) stimulation of AC occurred at both higher and lower concentrations of deoxycholic acid, with no effect at 10(-10) M. Taurocholic acid, 10(-4) M, and epinephrine and norepinephrine, 10(-2) M, 10(-4) M, 10(-6) M, and 10(-8) M, had no effect on AC. Propranolol, 10(-6) M, caused a 60% decrease (P less than 0.01) in the stimulated AC activity induced by 10(-4) M deoxycholic acid. Propranolol, 10(-4) M, decreased basal AC by 30% (P less than 0.01).
In Conclusion: (1) Deoxycholic acid, but not taurocholic acid, epinephrine, or norepinephrine, stimulates colonic AC activity. (2) Propranolol inhibited this deoxycholic acid stimulation of AC. (3) Catecholamines are not intermediaries in this action of propranolol on colonic mucosal AC activity.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
High leafy and root vegetables and high rice dietary patterns were associated with primary and secondary bile acid levels in the feces.
Sci Rep
January 2025
Department of Health and Nutrition, Yamagata Prefectural Yonezawa University of Nutrition Sciences, 6-15-1, Torimachi, Yonezawa, Yamagata, 992-0025, Japan.
Colorectal cancer has the second highest mortality among cancer sites worldwide, with increasing morbidity, high recurrence rates, and even poorer postoperative quality of life. Therefore, preventive strategies for colorectal cancer should be established. This study aimed to cross-sectionally explore dietary patterns affecting the intestinal metabolism of bile acids (BAs), a risk factor for colorectal cancer, in young Japanese women.
View Article and Find Full Text PDFSecondary bile acid derivatives are contributors to the fecal bile acid pool and associated with bile acid modulating nutrients.
J Nutr
January 2025
Department of Kinesiology and Nutrition, University of Illinois Chicago, Chicago, IL, USA; University of Illinois Cancer Center, Chicago, Illinois, USA. Electronic address:
Objective: Accumulation of hydrophobic bile acids is linked with cancer development. However, derivatives of deoxycholic acid (DCA) and lithocholic acid (LCA) produced via bacterial metabolism may mitigate the proinflammatory and cytotoxic effects of hydrophobic bile acids. The impact of diet on secondary bile acid (BA) derivative production has not been determined.
View Article and Find Full Text PDFTrazodone, dibenzoylmethane and tauroursodeoxycholic acid do not prevent motor dysfunction and neurodegeneration in Marinesco-Sjögren syndrome mice.
PLoS One
January 2025
Department of Neuroscience, Laboratory of Prion Neurobiology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Milan, Italy.
There is no cure for Marinesco-Sjögren syndrome (MSS), a genetic multisystem disease linked to loss-of-function mutations in the SIL1 gene, encoding a BiP co-chaperone. Previously, we showed that the PERK kinase inhibitor GSK2606414 delays cerebellar Purkinje cell (PC) degeneration and the onset of ataxia in the woozy mouse model of MSS. However, GSK2606414 is toxic to the pancreas and does not completely rescue the woozy phenotype.
View Article and Find Full Text PDFGalactooligosaccharide-Metabolism-Related Genes of Contribute to the Regulation of Glucose and Lipid Metabolism in Type 2 Diabetic Mice.
J Agric Food Chem
January 2025
State Key Laboratory of Food Science and Resources, Jiangnan University, Wuxi, Jiangsu 214122, China.
This study investigated whether the galactooligosaccharide (GOS)-metabolism-related genes (GOS-cluster) in contribute to alleviating glucose and lipid metabolic disorders in type 2 diabetic mice. Genomic analysis of 69 strains based on the GOS-cluster, combined with in vitro fermentation experiments, revealed that high-GOS-cluster strains (≥24 MFS, ≥39 GOS-cluster) demonstrated superior GOS utilization and bile salt tolerance. In vivo the high-GOS-cluster strains resulted in a significant reduction of blood glucose levels by 18.
View Article and Find Full Text PDFYiqi Huayu Jiedu formula inhibits JAK2/STAT3-mediated partial EMT in treating chronic atrophic gastritis.
Phytomedicine
December 2024
State Key Laboratory of Traditional Chinese Medicine Syndrome/Department of Gastroenterology, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangdong Provincial Hospital of Chinese Medicine, Guangdong Provincial Academy of Chinese Medical Sciences/State Key Laboratory of Dampness Syndrome of Chinese Medicine, Guangzhou, China; Guangdong Provincial Key laboratory of Chinese Medicine for Prevention and Treatment of Refractory Chronic Diseases, Guangzhou, China. Electronic address:
Background: Chronic atrophic gastritis (CAG) is a precursor to gastric cancer, a leading cause of cancer-related deaths worldwide. Despite current therapeutic strategies, preventing the transition from gastritis to cancer remains a challenge. Traditional Chinese Medicine (TCM), particularly the Yiqi-Huayu-Jiedu (YQHYJD) formula, have exhibited promising results in CAG management.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!