Journal of Pharmacy Research Vol.9 Issue 6.June 2015 Mahin Ghorbani et al. / Journal of Pharmacy Research 2015,9(6),377-382 377-382 Review Article ISSN: 0974-6943 Available online through www.jprsolutions.info * Corresponding author. Mahin Ghorbani Department of Biotechnology, Fergusson College, F.C. Road, Pune, Maharashtra 411004, India Cyclin-Dependent Kinases as valid targets for cancer treatment. Mahin Ghorbani 1* , Hamed Karimi 2 1 Department of Biotechnology, Fergusson College, F.C. Road, Pune, Maharashtra 411004, India 2 Department of Information Technology , Payam noor university of Farokh-shahr , Farokh-shar, Chaharmah va bakhtiari, Iran Received on:25-04-2015; Revised on:21-05-2015; Accepted on: 24-06-2015 ABSTRACT Ineffectiveness of conventional chemotherapeutic drugs and appearance of several side effects such as hair loss and anemia, nausea, vomiting, diarrhea, infections, fatigue and destruction of the immune system, due to inability to discriminate normal cells and cancerous cells, have led to development of new anti proliferative drugs with less side effect and more efficacy .Cell cycle and cell regulation play significant role in drug discovery as they provide new opportunities for discovery of new drug target for treatment of cancers. CDKs are introduced as significant target for anticancer drugs as they are directly and indirectly involved in cell cycle events such as progression, transcription and DNA repair, so development of Cdk inhibitors become goal of many drug discovery companies and researchers, for treatment of cancers. In this paper we focused on Cdks , their regulatory role in cell cycle and their prominent characteristics as valid target for drug discovery . Finally, we have reviewed 14 upcoming anticancer candidates whose target is CDKs .These anticancer drugs are such as Flavopiridol, Roscovitine, Dinaciclib, SNS032, AT7519, PD0332991, RGB-286638, P276-00, BAY-1000394, TG02/SG1317, EM-1421. PHA-848125. LEE-011 and LY2835219 which are currently under investigation for treatment of cancer. We hope this paper gives informative background for understanding importance of Cdks as effective targets for cancer therapy with high effective results and minimum side effect . KEYWORDS: Cdks, Kinases, Inhibitors, Anticancer drugs, Drug discovery, INTRODUCTION: Conventional chemotherapeutic drugs are non specific target chemi- cal substances, used for treatment of cancer( Gore L et al., 2013).Due to their inability to distinguish accurately normal cells and cancerous cells because of their non specific target interaction , they are suscep- tible to normally rapidly dividing cells too, as a result, they produce several side effects due to damage to normal cells , These side effects are mostly including , diarrhea, anemia, hair loss vomiting ,infections, , nausea ,fatigue and destruction of the immune system. To overcome such disadvantages , new anti cancer drug candidates are developed , which show specific target interaction with high affinity towards specific target .New drugs for cancer treatment are designed based on their specific target involved in cell cycle regulation to provide exact cancer therapy(Gore L et al., 2013)The Cell cycle is a harmoni- ous combination process at molecular level which leads in division of cell and its proliferation, and its connection with cancers has as- sumed greater significance .The cell cycle is important source for target identification, helps in understanding underlying pathways of cancers to facilitate new opportunities to discover new target for cancer therapy (Matthews et al., 2010 ; Moen et al., 2010)Regulation of cell cycle is done by several regulatory factors, among them, Cdks show significance, and they are serine/threonine kinases. They are activated and inactivated by cyclin and cdk inhibitor respectively(Matthews et al., 2010 ; Moen et al., 2010).Protein ki- nases is regulated by binding to cyclin hence named cyclin depen- dent kinases,the complex cyclin- cdks phosphorylate their substrates on serines and threonines for cell cycle progression .Several cellular activities and functions such as growth and development processes and homeostasis of eukaryotic of cells are controlled by signaling pathway of CDKs . Since 1980s evidences have shown clearly the role of protein kinases in carcinogenesis and tumor growth (Matthews et al., 2010 ; Meijer, 2003) . Unrevealing the regulation mechanism of Cdks led to the Nobel Prize award to Krebs and Fischer in 1992 (Matthews et al., 2010). The set of protein kinases in organism’s ge- nome is called Kinome , the set of human’s kinome consist of 518 known proteins , included in seven families .CDks are classified in 13 subfamilies (CDK1 to CDK13) but new subfamilies are investigated