Send to

Choose Destination
See comment in PubMed Commons below
Am J Physiol Cell Physiol. 2001 May;280(5):C1184-92.

Differential expression and alternative splicing of TRP channel genes in smooth muscles.

Author information

Department of Physiology, University of Nevada School of Medicine, Reno, Nevada 89557, USA.


Nonselective cation channels (NSCC) are targets of excitatory agonists in smooth muscle, representing the nonselective cation current I(cat). Na(+) influx through NSCC causes depolarizations and activates voltage-dependent Ca(2+) channels, resulting in contraction. The molecular identity of I(cat) in smooth muscle has not been elucidated; however, products of the transient receptor potential (TRP) genes have characteristics similar to native I(cat). We have determined the levels of TRP transcriptional expression in several murine and canine gastrointestinal and vascular smooth muscles and have analyzed the alternative processing of these transcripts. Of the seven TRP gene family members, transcripts for TRP4, TRP6, and TRP7 were detected in all murine and canine smooth muscle cell preparations. TRP3 was detected only in canine renal artery smooth muscle cells. The full-length cDNAs for TRP4, TRP6, and TRP7, as well as one splice variant of TRP4 and two splice variants of TRP7, were cloned from murine colonic smooth muscle. Quantitative RT-PCR determined the relative amounts of TRP4, TRP6, and TRP7 transcripts, as well as that of the splice variants, in several murine smooth muscles. TRP4 is the most highly expressed, while TRP6 and TRP7 are expressed at a lower level in the same tissues. Splice variants for TRP7, deleted for exons encoding amino acids including transmembrane segment S1, predominated in murine smooth muscles, while the full-length form of the transcript was expressed in canine smooth muscles.

[Indexed for MEDLINE]
Free full text
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire
    Loading ...
    Support Center