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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Tortora, G. Aldinucci, D. Zagonel, V. Cho-chung, Y. S. Gattei, V. Budillon, A. Pinto, A. |
| Description | Author Affiliation: Pinto A ( Leukemia Unit, Istituti Nazionali di Ricerca e Cura a Carattere Scientifico, Aviano, Italy.); |
| Abstract | The physiologic balance between the two regulatory subunit isoforms, RI and RII, of cAMP-dependent protein kinase is disrupted in cancer cells; growth arrest and differentiation of malignant cells can be achieved when the normal ratio of these intracellular signal transducers of cAMP is restored by the use of site-selective cAMP analogs. In this study we evaluated the effects of the site-selective cAMP analog 8-chloroadenosine 3',5'-cyclic monophosphate (8-Cl-cAMP) on clonogenic growth of blast progenitors from 15 patients with acute myeloblastic leukemia and 3 patients affected by advanced myelodysplastic syndrome. Leukemic blast progenitors undergo terminal divisions, giving rise to colonies in methylcellulose. The self-renewal capacity of blast progenitors is conversely reflected in a secondary methylcellulose assay after exponential growth of clonogenic cells in suspension cultures. In all the samples tested, 8-Cl-cAMP, at micromolar concentrations (0.1-50 microM), suppressed in a dose-dependent manner both primary colony formation in methylcellulose and the recovery of clonogenic cells from suspension culture. Strikingly, in the samples from the entire group of patients, 8-Cl-cAMP was more effective in inhibiting the self-renewing clonogenic cells than the terminally dividing blast cells (P = 0.005). In addition, in four out of six cases studied, 8-Cl-cAMP was able to induce a morphologic and/or immunophenotypic maturation of leukemic blasts. An evident reduction of RI levels in fresh leukemic cells after exposure to 8-Cl-cAMP was also detected. Our results showing that 8-Cl-cAMP is a powerful inhibitor of clonogenic growth of leukemic blast progenitors by primarily suppressing their self-renewal capacity indicate that this site-selective cAMP analog represents a promising biological agent for acute myeloblastic leukemia therapy in humans. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 19 |
| Volume Number | 89 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1992-11-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | 8-Bromo Cyclic Adenosine Monophosphate Analogs & Derivatives Antineoplastic Agents Pharmacology Blast Crisis Pathology Cell Survival Drug Effects Leukemia, Myeloid, Acute Tumor Cells, Cultured Affinity Labels Metabolism Antigens, Surface Azides Culture Techniques Cyclic AMP Dose-Response Relationship, Drug Kinetics Receptors, Cyclic AMP Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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