Differential regulation of adrenomedullin gene expression in the fundic and pyloric regions of the rat stomach during acute and chronic starvation
Copyright policy )Differential regulation of adrenomedullin gene expression in the fundic and pyloric regions of the rat stomach during acute and chronic starvation
Adrenomedullin (AM) has been shown to be present in the stomach but the role of gastric AM is obscure. To investigate the effects of starvation on AM in the stomach, we studied the changes in gene expression of preproadrenomedullin (preproAM) and AM receptors by reverse transcription-polymerase chain reaction (RT-PCR), and tissue AM concentrations by radioimmunoassay (RIA) in the fundus and pylorus of the stomach of rats subjected to either acute (1-day) or chronic (4-day) starvation. An up-regulation of preproAM gene expression was observed in the fundus after acute starvation, and in the pylorus after chronic starvation. Immunoreactive AM (ir-AM) levels were increased in both fundus and pylorus after chronic starvation. In addition, marked reductions in the gene expression of fundic calcitonin receptor-like receptor (CRLR) and receptor activity-modifying protein (RAMP) 3 as well as the pyloric CRLR and RAMP2 were observed in the chronically starved rats. The present study suggests that the gene expression of preproadrenomedullin mRNA is differentially regulated by starvation in the different parts of the stomach.
- University of Hong Kong China (People's Republic of)
- University of Hong Kong (香港大學) China (People's Republic of)
- Li Ka Shing Faculty of Medicine, University of Hong Kong Hong Kong
Male, Messenger - biosynthesis, 572, Radioimmunoassay, Rats, Sprague-Dawley, Plasma, Adrenomedullin, Activity modifying proteins, Adrenomedullin - biosynthesis - genetics - physiology, Animals, Gastric Fundus, RNA, Messenger, Pylorus, Chromatography, Gel, Starvation - genetics - physiopathology, RNA, Messenger - biosynthesis, Reverse Transcriptase Polymerase Chain Reaction, Body Weight, Body Weight - physiology, Gastric Fundus - metabolism - physiology, Organ Size, Immunohistochemistry, Rats, Kinetics, Gene Expression Regulation, Gastric Mucosa, Starvation, Gene Expression Regulation - physiology, Acute Disease, Chronic Disease, Pylorus - metabolism - physiology, Chromatography, Gel, RNA, Organ Size - physiology, Sprague-Dawley, Receptor, Stomach - metabolism - physiopathology
Male, Messenger - biosynthesis, 572, Radioimmunoassay, Rats, Sprague-Dawley, Plasma, Adrenomedullin, Activity modifying proteins, Adrenomedullin - biosynthesis - genetics - physiology, Animals, Gastric Fundus, RNA, Messenger, Pylorus, Chromatography, Gel, Starvation - genetics - physiopathology, RNA, Messenger - biosynthesis, Reverse Transcriptase Polymerase Chain Reaction, Body Weight, Body Weight - physiology, Gastric Fundus - metabolism - physiology, Organ Size, Immunohistochemistry, Rats, Kinetics, Gene Expression Regulation, Gastric Mucosa, Starvation, Gene Expression Regulation - physiology, Acute Disease, Chronic Disease, Pylorus - metabolism - physiology, Chromatography, Gel, RNA, Organ Size - physiology, Sprague-Dawley, Receptor, Stomach - metabolism - physiopathology
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