Differential transcriptional expression of Ca2+ BP superfamilies in murine gastrointestinal smooth muscles

Am J Physiol Gastrointest Liver Physiol. 2002 Dec;283(6):G1290-7. doi: 10.1152/ajpgi.00101.2002. Epub 2002 May 29.

Abstract

Calmodulin (Cal) plays important roles for contractile activity in smooth muscles. Recently, two distinct Ca(2+)-binding protein superfamilies with sequence similarities to Cal have been identified in neuronal cells: neuronal Ca(2+)-binding proteins (NCBPs) and Cal-like Ca(2+)-binding proteins (CaBPs). Some NCBPs and CaBPs play significant roles for Ca(2+)-dependent cellular signaling in the nervous system. In gastrointestinal smooth muscles (GISMs), Cal functions as the regulator of contractile behavior and electrical rhythmicity. However, the molecular identification of NCBPs and CaBPs has not been elucidated in GISMs. Here, we have identified NCBPs and CaBPs expressed in GISMs and determined the expression levels of their transcripts by quantitative RT-PCR. Of 12 NCBPs, the transcripts for neuronal Ca(2+) sensor 1, neural visinin-like proteins 1, 2, and 3, and K(+) channel-interacting proteins 1 and 3 were detected in proximal colon, gastric fundus, gastric antrum, and jejunum. On the other hand, of seven CaBPs including alternatively spliced variants, only CaBP1L transcripts were detected in GISMs.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Alternative Splicing
  • Animals
  • Brain Chemistry
  • Calcium-Binding Proteins / genetics*
  • Calcium-Binding Proteins / physiology
  • Calmodulin / physiology
  • Colon / chemistry
  • Digestive System / chemistry
  • Digestive System / metabolism*
  • Gastric Fundus / chemistry
  • Gene Expression*
  • Jejunum / chemistry
  • Kv Channel-Interacting Proteins
  • Mice
  • Mice, Inbred BALB C
  • Molecular Sequence Data
  • Muscle, Smooth / chemistry
  • Muscle, Smooth / metabolism*
  • Myocardium / chemistry
  • Nerve Tissue Proteins / genetics
  • Neurocalcin
  • Neuronal Calcium-Sensor Proteins
  • Neurons / chemistry
  • Neuropeptides / genetics
  • Pyloric Antrum / chemistry
  • RNA, Messenger / analysis
  • Receptors, Calcium-Sensing*
  • Repressor Proteins*
  • Reverse Transcriptase Polymerase Chain Reaction
  • Transcription, Genetic

Substances

  • Calcium-Binding Proteins
  • Calmodulin
  • Csen protein, mouse
  • Kcnip1 protein, mouse
  • Kv Channel-Interacting Proteins
  • Nerve Tissue Proteins
  • Neurocalcin
  • Neuronal Calcium-Sensor Proteins
  • Neuropeptides
  • RNA, Messenger
  • Receptors, Calcium-Sensing
  • Repressor Proteins
  • Vsnl1 protein, mouse
  • frequenin calcium sensor proteins

Associated data

  • GENBANK/AB079893