Gene expression and tyrosine kinase activity of insulin receptor in uterine leiomyoma and matched myometrium

Our objective was to determine the insulin receptor (IR) mRNA levels and IR tyrosine kinase activity in normal myometrium and leiomyoma. Experimental study. Academic research center. Five women with leiomyoma submitted to hysterectomy. Plasma membrane fraction of human myometrium and leiomyoma were...

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Published in:	Archives of gynecology and obstetrics Vol. 270; no. 3; pp. 170 - 173
Main Authors:	Toscani, Guilherme Kirjner, Chaves, Eunice Martin, Cervi, Fabíola Lara, Tavares, Marcelo Belmonte, Silva, Ilma Simoni Brum da, von Eye Corleta, Helena, Capp, Edison
Format:	Journal Article
Language:	English
Published:	Germany Springer Nature B.V 01-11-2004
Subjects:	Blotting, Western Case-Control Studies DNA Primers Female Fibroids Gene expression Gene Expression Regulation, Neoplastic Humans Insulin Kinases Leiomyoma - metabolism Myometrium - metabolism Phosphorylation Protein-Tyrosine Kinases - genetics Protein-Tyrosine Kinases - metabolism Receptor, Insulin - genetics Receptor, Insulin - metabolism Reverse Transcriptase Polymerase Chain Reaction RNA, Messenger - genetics Uterine Neoplasms - metabolism
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Summary:	Our objective was to determine the insulin receptor (IR) mRNA levels and IR tyrosine kinase activity in normal myometrium and leiomyoma. Experimental study. Academic research center. Five women with leiomyoma submitted to hysterectomy. Plasma membrane fraction of human myometrium and leiomyoma were prepared and samples were incubated with and without insulin. mRNA was isolated and RT-PCR with specific primers was performed. Western blots of plasma membranes incubated with and without insulin were performed. Chemoluminescent methods followed by densitometry were used to assess IR autophosphorylation. RT-PCR with specific primers for IR gene sequences was used to determine IR mRNA levels. IR mRNA levels in myometrium (0.634+/-0.038) and in leiomyoma (0.649+/-0.047; p=0.813) were not different. The degree of insulin-stimulated IR autophosphorylation (relative optical density of the 95 kDa band) was also not different between myometrium (1.496+/-0.310) and leiomyoma (1.593+/-0.129; p=0.650). There was no difference in IR receptor expression and IR autophosphorylation between normal myometrium and leiomyoma. Other steps of insulin signaling chain may participate in the altered proliferation of leiomyomas.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0932-0067 1432-0711
DOI:	10.1007/s00404-003-0534-5