Activation of protein kinase C delta induces growth arrest in NPA thyroid cancer cells through extracellular signal-regulated kinase mitogen-activated protein kinase

Thyroid : Official Journal of the American Thyroid Association
Kenta KoikeKazuo Shirouzu

Abstract

Protein kinase C (PKC) is a family of serine-threonine kinases that regulate many cell processes. To study the role of PKCdelta in thyroid cancer cells, we used a replication-deficient adenovirus (PKCdeltaAdV), to tightly control PKCdelta expression. In NPA cells, activation of wild-type (WT) PKCdelta with phorbol 12-myristate 13-acetate (PMA) induced an arrest in cell growth at G(1) phase, which was itself inhibited by the PKCdelta inhibitor rottlerin. Furthermore, overexpression of a dominant negative PKCdelta did not induce G(1) arrest. These findings strongly suggested that PKCdelta induced cell growth arrest in NPA cells. We investigated the mechanism of G1 arrest by examining G(1)-related proteins and mitogen-activated protein kinase (MAPK) by Western blotting. After activation of WTPKCdelta with PMA, cyclin E expression and retinoblastoma protein (Rb) phosphorylation decreased; the expression of p27(Kip1) increased and the phosphorylation of extracellular signal-regulated kinase (ERK) MAPK decreased. These results indicated that the activation of PKCdelta induced cell growth arrest in NPA cells, through an ERK MAPK-p27(Kip1)-cyclin E-pRb pathway. PKCdelta may therefore be an effective molecular target for novel therapy i...Continue Reading

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Citations

Nov 16, 2010·In Vitro Cellular & Developmental Biology. Animal·Claudia TorricelliEmanuela Maioli
Oct 2, 2012·Cancer Investigation·Seo-Yun TongSeon-Kyung Lee
Nov 17, 2011·Journal of Proteomics·Hao-Ai ShuiChih-Yuan Wang
Nov 3, 2015·Molecular and Cellular Endocrinology·Erica GentilinMaria Chiara Zatelli
Oct 26, 2007·Human Pathology·Elaine M RenoAndrew P Bradford
Jul 30, 2015·Endocrine-related Cancer·Denise ZwanzigerDagmar Fuehrer
Apr 11, 2009·American Journal of Physiology. Gastrointestinal and Liver Physiology·Jacques Q van der MerweWallace K MacNaughton

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