The secretion of amylase and trypsinogen from isolated rat pancreatic acini was greatly stimulated by 3-25 mM nicotine. In the presence of 12.5 mM nicotine, a concentration used in the study, amylase and trypsinogen release was increased by 95 and 400%, respectively, when compared with the corresponding control and showed further a preferential release of trypsinogen. A 90-min time course release of the enzymes revealed that in the presence of nicotine trypsinogen-to-amylase ratio remained two- to threefold elevated over that of the control throughout the incubation period. The nicotine-induced stimulation of trypsinogen and amylase release from the acini could not be blocked by 2.5 mM cycloheximide, a dose that inhibited overall acinar protein synthesis by about 85%. When isolated acini were incubated with [3H]leucine in the presence of nicotine, the released proteins revealed a fourfold higher radioactivity (dpm/microgram acinar DNA) than the control. Cycloheximide dramatically decreased this increment. The rate of release of 3H-pulse-labeled proteins from the acini was greatly accelerated by nicotine. It is concluded that nicotine stimulates the secretion of preformed zymogen granules and newly synthesized proteins from dispersed rat pancreatic acini in vitro.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1152/ajpgi.1985.248.2.G158 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Matching model with mechanism: Appropriate rodent models for studying various aspects of diabetes pathophysiology.
Methods Cell Biol
January 2025
School of Cardiovascular and Metabolic Medicine & Sciences, King's College London, London, United Kingdom. Electronic address:
Many rodent models are available for preclinical diabetes research making it a challenge for researchers to choose the most appropriate one for their experimental question. To aid in this, models have classically been categorized according to which type of diabetes they represent, and further into whether the model is induced, spontaneous or the result of genetic manipulation. This fails to capture the complexity of pathogenesis seen in diabetes in humans.
View Article and Find Full Text PDFTrkB Receptor Antagonism Enhances Insulin Secretion and Increases Pancreatic Islet Size in Rats Fed a Cafeteria-Style Diet.
Biomedicines
January 2025
Centro Universitario de Investigaciones Biomédicas, Universidad de Colima, Colima 28045, Colima, Mexico.
In recent years, the role of neurotrophins and their receptors in peripheral tissues has been of great interest. At a metabolic level, the brain-derived neurotrophic factor (BDNF) and its receptor trkB have been reported to participate in insulin secretion from the pancreas in response to increases in circulating blood glucose. To determines the role of the BDNF-trkB pathway in insulin secretion and pancreatic morphology in rats fed a cafeteria-style diet for 16 weeks.
View Article and Find Full Text PDFCharacterization and In Vitro Digestion Kinetics of Purified Pulse Starches: Implications on Bread Formulation.
Foods
January 2025
Whistler Center for Carbohydrate Research and Department of Food Science, Purdue University, West Lafayette, IN 47907, USA.
This study investigated the contribution of pulse starches (PSs) to the slowly digestible starch (SDS) properties observed in pulses. Purified pulse starches from 17 commonly consumed pulses were examined, focusing on their digestion kinetics using a pancreatic alpha-amylase (PAA) and rat intestinal acetone powder (RIAP) mixture. Chickpea starch, exhibiting a slow digestibility profile, was incorporated as an ingredient to confer slow digestibility to refined wheat flour bread.
View Article and Find Full Text PDFIn vivo and in silico study of europinidin against streptozotocin-isoproterenol-induced myocardial damage via alteration of hs-CRP/CPK-MB/Caspase-3/Bcl-2 pathways.
Sci Rep
January 2025
Department of Biochemistry, Faculty of Sciences, King Abdulaziz University, Jeddah, 21589, Saudi Arabia.
Europinidin is a novel anthocyanidin found in the petals of Plumbago europea that exhibits several physiological effects. Research was conducted to assess europinidin's cardioprotective efficacy in a diabetic and myocardial infarction (MI) experimental model. Rat was injected through the intraperitoneal administration of 45 mg/kg of streptozotocin (STZ), while MI was induced by subcutaneously administering 85 mg/kg of isoproterenol (ISP) at 24 and 48 h prior to the sacrifice procedure.
View Article and Find Full Text PDFDiscovery of 1,4-Disubstituted Cyclohexene Analogues as Selective GPR119 Agonists for the Treatment of Type 2 Diabetes.
J Med Chem
January 2025
School of Pharmacy, Sungkyunkwan University, Suwon 16419, Republic of Korea.
GPR119 has emerged as a promising target for treating type 2 diabetes and associated obesity, as its stimulation induces the secretion of glucagon-like peptide-1 and glucose-dependent insulinotropic peptide in the intestinal tract as well as the glucose-dependent release of insulin in pancreatic β-cells. We describe the design and synthesis of novel GPR119 agonists containing a 1,4-disubstituted cyclohexene scaffold. Compound displayed nanomolar potency (EC = 3.
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!