RGD Reference Report - Involvement of receptor-type tyrosine kinase gene families in cardiac hypertrophy. - Rat Genome Database

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Involvement of receptor-type tyrosine kinase gene families in cardiac hypertrophy.

Authors: Akiyama, Y  Ashizawa, N  Seto, S  Ohtsuru, A  Kuroda, H  Ito, M  Yamashita, S  Yano, K 
Citation: Akiyama Y, etal., J Hypertens. 1999 Sep;17(9):1329-37.
RGD ID: 2317547
Pubmed: PMID:10489112   (View Abstract at PubMed)

OBJECTIVE: The activation of protein tyrosine kinases (PTKs) has been postulated to be involved in cell differentiation and proliferation. To elucidate the involvement of tyrosine kinase genes in normal and pathological conditions, we analysed the expression patterns of receptor-type PTKs in the normal and hypertensive hypertrophied heart in rats. MATERIALS AND METHODS: Hypertrophied and normal rat hearts were obtained from hypertensive rats; deoxycorticosterone acetate (DOCA)-salt and 2 kidney-1 clip (2K-1C), and their sham-operated rats, respectively. A reverse transcription-polymerase chain reaction (RT-PCR) was performed using degenerated primers which were designed from highly conserved regions in the catalytic domains of receptor-type PTKs. The PCR products were ligated into a sequence vector, and subcloned by transforming bacteria. To compare the expression level of these PTK mRNAs in the normal and hypertrophied heart, we performed semi-competetive RT-PCR and immunohistochemical and Western blot analyses. RESULTS: Nucleotide sequencing of approximately 80 clones of PTKs revealed 10 receptor-type, five nonreceptor-type and two unknown types in the rat heart. Tie-2/Tek, Ryk, insulin-like growth factor-I receptor were abundantly expressed in the rat heart as members of receptor-type PTKs. Immunohistochemistry and RT-PCR demonstrated the presence of platelet-derived growth factor (PDGF)-alpha receptor, PDGF-beta receptor and fibroblast growth factor-3 receptor in both normal and hypertrophied hearts. We also confirmed the presence of Flt-1, KDR/FIk-1, and their ligand vascular endothelial growth factor, c-Met and its ligand hepatocyte growth factor (HGF), and Tie-1, Tie-2/Tek by immunohistochemistry and RT-PCR. The coexpression of cardiac HGF and c-Met in hypertrophied hearts, especially in 2K-1 C rats, was induced more intensively than that in DOCA-salt rats. CONCLUSION: These findings suggest that HGF/c-Met interactions may play an important role in cardiac hypertrophy and remodeling, probably as a result of the activation of the local renin-angiotensin system.

RGD Manual Disease Annotations    Click to see Annotation Detail View
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
Cardiomegaly  ISOMet (Rattus norvegicus)2317547; 2317547protein:increased expression:ventricle (rat)RGD 
Cardiomegaly  IEP 2317547protein:increased expression:ventricle (rat)RGD 

Objects Annotated

Genes (Rattus norvegicus)
Met  (MET proto-oncogene, receptor tyrosine kinase)

Genes (Mus musculus)
Met  (met proto-oncogene)

Genes (Homo sapiens)
MET  (MET proto-oncogene, receptor tyrosine kinase)


Additional Information