NCBI and Uniprot Product Information
NCBI Description
Histamine is a ubiquitous messenger molecule released from mast cells, enterochromaffin-like cells, and neurons. Its various actions are mediated by histamine receptors H1, H2, H3 and H4. Histamine receptor H2 belongs to the family 1 of G protein-coupled receptors. It is an integral membrane protein and stimulates gastric acid secretion. It also regulates gastrointestinal motility and intestinal secretion and is thought to be involved in regulating cell growth and differentiation. Alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Aug 2008]
Uniprot Description
H2R: The H2 subclass of histamine receptors mediates gastric acid secretion. Also appears to regulate gastrointestinal motility and intestinal secretion. Possible role in regulating cell growth and differentiation. The activity of this receptor is mediated by G proteins which activate adenylyl cyclase and, through a separate G protein-dependent mechanism, the phosphoinositide/protein kinase (PKC) signaling pathway. Belongs to the G-protein coupled receptor 1 family. 2 isoforms of the human protein are produced by alternative splicing.
Protein type: Receptor, GPCR; GPCR, family 1; Membrane protein, multi-pass; Membrane protein, integral
Chromosomal Location of Human Ortholog: 5q35.2
Cellular Component: integral to plasma membrane; plasma membrane
Molecular Function: histamine receptor activity
Biological Process: G-protein signaling, coupled to cyclic nucleotide second messenger; gland development; gastrin-induced gastric acid secretion; gut development; histamine-induced gastric acid secretion; positive regulation of vasoconstriction; visual learning; regulation of synaptic plasticity; immune response; memory