Περίληψη:
Purpose: Most anticancer drugs show their antiproliferative and cytotoxic activity via induction of apoptosis. In the present study we assessed the implication and role of cordycepin, a polyadenylation-specific inhibitor and a well-known chemotherapeutic drug, in apoptosis, induced by the anticancer drug etoposide. Methods: For this purpose, a variety of leukemia and lymphoma cell lines (U937, K562, HL-60, Daudi, Molt-4) were treated with the anticancer drugs etoposide and/or cordycepin and assessed for poly(A) polymerase (PAP) activity and isoforms by the highly sensitive PAP activity assay and western blotting, respectively. Induction of apoptosis was determined by endonucleosomal DNA cleavage, DAPI staining, caspase-6 activity assay and ΔΨm reduction, whereas cytotoxicity and cell cycle status were assessed by Trypan blue staining, MTT assay and flow cytometry. Results and conclusions: The results showed that PAP changes in all cell lines, in response to apoptosis induced by etoposide, in many cases even prior to hallmarks of apoptosis (endonucleosomal cleavage of DNA, ΔΨm reduction). A further elucidation to this apoptosis-polyadenylation correlation was added, by cell treatment with cordycepin, resulting in either suppression (U937, K562) or induction (HL-60) of the apoptotic process, according to the cell type. However, inhibition of polyadenylation did not influence the cell lines Daudi and Molt-4 used, where alternative apoptotic pathways are induced through cleavage of DNA into high molecular weight fragments. © 2007 Springer-Verlag.
Συγγραφείς:
Thomadaki, H.
Scorilas, A.
Tsiapalis, C.M.
Havredaki, M.
Λέξεις-κλειδιά:
3 (5 dimethylthiazol 2 yl) 2,5 diphenyltetrazolium bromide; bromine derivative; caspase 6; cordycepin; etoposide; polynucleotide adenylyltransferase; trypan blue; unclassified drug, analytic method; apoptosis; article; cancer therapy; cell cycle; cell type; controlled study; cytotoxicity; DNA cleavage; enzyme activity; flow cytometry; human; human cell; leukemia cell; lymphoma cell; polyadenylation; priority journal, Antineoplastic Agents; Antineoplastic Agents, Phytogenic; Apoptosis; Blotting, Western; Caspase 6; Cell Cycle; Cell Line, Tumor; Cell Proliferation; Deoxyadenosines; DNA Fragmentation; Etoposide; Flow Cytometry; Fluorescent Dyes; Humans; Image Processing, Computer-Assisted; Indoles; Leukemia; Membrane Potentials; Mitochondrial Membranes; Neoplasms; Poly A
