RGD Reference Report - COX-2-dependent cardiac failure in Gh/tTG transgenic mice. - Rat Genome Database

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COX-2-dependent cardiac failure in Gh/tTG transgenic mice.

Authors: Zhang, Z  Vezza, R  Plappert, T  McNamara, P  Lawson, JA  Austin, S  Pratico, D  Sutton, MS  FitzGerald, GA 
Citation: Zhang Z, etal., Circ Res 2003 May 30;92(10):1153-61. Epub 2003 Apr 17.
RGD ID: 1302539
Pubmed: PMID:12702643   (View Abstract at PubMed)
DOI: DOI:10.1161/01.RES.0000071749.22027.45   (Journal Full-text)

Gh is a GTP binding protein that couples to the thromboxane receptor (TP), but also functions as tissue transglutaminase II (tTG). A transgenic mouse model was generated in which Gh was overexpressed (GhOE) in ventricular myocytes under the control of the alpha-myosin heavy chain promoter. Heart rate was elevated and both blood pressure and left ventricular ejection fraction were depressed in GhOEs. Left ventricular mass was increased, consistent with genetic and ultrastructural evidence of hypertrophy. Fibrosis and apoptosis were also augmented. Survival declined disproportionately in older GhOEs. Cardiomyocyte expression of COX-2, thromboxane synthase (TxS), and the receptors for TxA2 (the TP), PGF2alpha (the FP), and PGI2 (the IP) were upregulated and urinary 8,12-iso-iPF2alpha-VI,2,3-dinor-6-keto-PGF1alpha and 2,3-dinor-thromboxane B2 were increased in GhOEs, reflecting increased lipid peroxidation and cyclooxygenase (COX) activation. Selective COX-2 inhibition, TP antagonism, and suppression of lipid peroxidation each rescued the cardiac phenotype. Infusion of an FP agonist exacerbated the phenotype, whereas administration of an IP agonist improved cardiac function. Directed cardiac overexpression of Gh/tTG causes both TG activation and increased TP/Gh-dependent signaling. The COX-2-dependent increase in TxA2 generation augments cardiac hypertrophy, whereas formation of PGI2 by the same isozyme ameliorates the phenotype. Oxidant stress may contribute, via regulation of COX-2 expression and/or ligation of the TP and the FP by isoprostanes. Gh/tTG activation regulates expression of COX-2 and its products may differentially modulate cardiomyocyte commitment to cell death or survival.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
Left Ventricular Hypertrophy  ISOTgm2 (Rattus norvegicus)1302539; 1302539 RGD 
Left Ventricular Hypertrophy  IMP 1302539 RGD 

Objects Annotated

Genes (Rattus norvegicus)
Tgm2  (transglutaminase 2)

Genes (Mus musculus)
Tgm2  (transglutaminase 2, C polypeptide)

Genes (Homo sapiens)
TGM2  (transglutaminase 2)


Additional Information