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Summary Apoptosis is a form of cell death which is important in many physiological processes. Four apoptotic mechanisms have been identified but two have been well examined: the intrinsic and the extrinsic mechanism. Due to many pro/antiapoptotic factors, these processes take place on a physiologically useful level. In cases of apoptosis dysregu lation, illnesses occur such as neurodegenerative diseases combined with an increased level of cell death or cancerogenesis associated with uncontrolled cell proliferation. Apoptosis can be triggered by the activation of the first caspase in a series and stopped by its deactivation, which represents a new challenge: determining the »point of no return«. Besides the antiapoptotic proteins (Bcl 2, Bcl XL), a family of proteins called the Inhibitors of Apoptosis Proteins (IAPs) play a key role in the regulation of apoptosis. Members of the IAP family are: cIAP1, cIAP2, XIAP, Survivin, Livin and TsIAP. Domain BIR is the most important in the IAP structure since it determines their specificity for caspases. The interaction of IAPs with caspases is complex and not completely understood, however, IAPs are considered to be important target proteins in the therapy of tumor and autoimmune diseases. Kratak sadržaj Apoptoza predstavlja oblik ćelijske smrti i važna je u mnogim fiziološkim procesima. Postoje četiri oblika ćelijske smrti a dva su dobro proučena: unutrašnji i spoljašnji. Zahvaljujući mnogim pro/antiapop- totičkim faktorima, ovaj proces se odvija na fiziološki koris- nom nivou. U slučaju disregulacije apoptoze nastaju bolesti kao što su neurodegenerativna oboljenja udružena sa povišenim nivoom ćelijske smrti ili karcinogeneza udružena sa nekontrolisanom ćelijskom proliferacijom. Apoptozu može pokrenuti aktivacija prve kaspaze u nizu i prekinuti njena deaktivacija, što predstavlja novi izazov: odrediti »tačku bez povratka«. Pored antiapoptotičnih proteina (Bcl 2, Bcl XL), familija proteina nazvanih inhibitori apoptoze (eng. Inhibitors of Apoptosis Proteins, lAPs) igra ključnu ulogu u procesu regulacije. Pripadnici familije IAP su: clAP1, clAP2, XIAf? survivin, livin i TslAP Domen BIR je najznačajniji u strukturi IAP budući da određuje specifičnost ka kaspazama. Interakcija IAP sa kaspazama je kompleksna i nedovoljno istražena, međutim, smatra se da lAPs predstavljaju važne ciljne proteine u terapiji tumora i autoimunih oboljenja.

Apoptosis Regulation by Inhibitors of Programmed Cell Death