Molecular cloning of the rat proteinase-activated receptor 4 (PAR4)

Willemijntje A. Hoogerwerf, Helen Hellmich, Maria Micci, John Winston, Lei Zhou, Pankaj J. Pasricha

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Background: The proteinase-activated receptor 4 (PAR4) is a G-protein-coupled receptor activated by proteases such as thrombin and trypsin. Although activation of PAR4 has been shown to modulate rat gastrointestinal motility, the rat PAR4 sequence was unknown until now. This study aimed to identify the rat PAR4 cDNA. Results: The cDNA coding for the rat PAR4 homologue was cloned from the duodenum. Northern blots demonstrated a 3.0 kb transcript in the duodenum. Protein homology with mouse and human counterparts was 90% and 75% respectively. PAR4 is expressed predominantly in the esophagus, stomach, duodenum and the spleen. When expressed in COS cells, PAR4 is activated by trypsin (1 nM), thrombin (50 nM), mouse PAR4 specific peptide (500 μM) and a putative rat PAR4 specific activating peptide (100 μM), as measured by intracellular Ca2+-changes. Conclusions: We have identified and characterized cDNA encoding the rat PAR4 homologue. PAR4 is expressed predominantly in the upper gastrointestinal tract. It is activated by trypsin, thrombin and its newly identified rat PAR4 specific activating peptide.

Original languageEnglish (US)
Article number2
JournalBMC Molecular Biology
Volume3
DOIs
StatePublished - Feb 18 2002

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Proteinase-Activated Receptors
Cloning
Molecular Cloning
Rats
Duodenum
Thrombin
Trypsin
Complementary DNA
Peptides
Upper Gastrointestinal Tract
Gastrointestinal Motility
COS Cells
G-Protein-Coupled Receptors
Northern Blotting
Esophagus

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

Cite this

Molecular cloning of the rat proteinase-activated receptor 4 (PAR4). / Hoogerwerf, Willemijntje A.; Hellmich, Helen; Micci, Maria; Winston, John; Zhou, Lei; Pasricha, Pankaj J.

In: BMC Molecular Biology, Vol. 3, 2, 18.02.2002.

Research output: Contribution to journalArticle

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