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. 1996 Jan 1;490(Pt 1):249–256. doi: 10.1113/jphysiol.1996.sp021140

Expression and regulation of a vesicular monoamine transporter in rat stomach: a putative histamine transporter.

R Dimaline 1, J Struthers 1
PMCID: PMC1158661  PMID: 8745292

Abstract

1. Vesicular monoamine transporters (VMATs) translocate monoamines from the cytoplasm into secretory vesicles of endocrine cells and neurones, but they have limited affinity for histamine, and the identity of the vesicular transporter for this monoamine is uncertain. The aims of the present study were to characterize VMAT representatives in rat gastric corpus, and to determine if their expression was regulated by factors that modulate histamine biosynthesis. 2. Polymerase chain reaction (PCR) cloning using oligonucleotide primers to DNA sequences conserved within the VMAT family provided evidence for VMAT2, but not VMAT1 in rat gastric corpus. Northern analysis using a VMAT2 complementary RNA probe revealed a single 4 kb mRNA species in corpus endocrine cells. 3. In rats treated for up to 5 days with the H(+)-K(+)-ATPase inhibitor omeprazole, VMAT2, histidine decarboxylase and chromogranin A mRNA abundance in gastric corpus, and plasma gastrin concentrations increased progressively. Omeprazole also elevated VMAT2 expression in rats fasted for 48 h, but fasting alone, or refeeding fasted animals had no effect. 4. The results are consistent with a role for VMAT2 in the transport of histamine into enterochromaffin-like cell secretory vesicles, and with upregulation of the transporter to accommodate the increased histamine biosynthesis and secretion that accompanies achlorhydria.

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Selected References

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