Cell signalling: growth factors and tyrosine kinase receptors.

Clinical & Translational Oncology : Official Publication of the Federation of Spanish Oncology Societies and of the National Cancer Institute of Mexico
Rosario Perona

Abstract

The mitogenic signaling in mammalian cells is carried out mainly by growth factors that interact with receptors localized at the plasma membrane. Most of these receptors have a tyrosine kinase activity domain that is localized at the cytoplasmic region of the molecule. The interaction of the growth factors with the receptors, besides inducing the kinase activity of the receptor, activate signaling pathways the alter gene expression patterns and induce mitogenesis, or if deregulated are related to cancer. Among these receptors ERBB, VEGF, PDGF and IGF are attractive targets for directed therapies. ERBB receptors are frequently involved in the production of many types of cancers. Both, the over-expression of the growth factor and the receptor, besides mutations at the cytoplasmic tyrosine kinase domain contribute to constitutive signaling in human cancer. VEGF has a pivotal role in maintaining the tumor growth by facilitating growth of new blood vessels. Therefore, inhibition of tumor growth targeting of the tumor vasculature, by interfering with the activity of VEGFr is now a real alternative in combinatorial therapies. PDGF is a growth factor involved in growth of connective tissue and wound healing. Activating mutations of PDG...Continue Reading

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