RT Journal Article SR Electronic T1 A close link between Fas, p53 and Apaf-1 in chronic myeloid leukemia JF Saudi Medical Journal JO Saudi Med J FD Prince Sultan Military Medical City SP 1119 OP 1121 VO 28 IS 7 A1 Alenzi, Faris Q. A1 Wyse, Richard K. A1 Tamimi, Waleed G. A1 Bamaga, Mohammad S. A1 Lotfy, Mahmoud YR 2007 UL http://smj.org.sa/content/28/7/1119.abstract AB In chronic myeloid leukemia CML proliferation is increased and resistance to apoptosis has been proposed as a mechanism accounting for myeloid cell expansion. There is still controversy on whether apoptosis plays an important role in the regulation of myelopoiesis. This study aims to investigate whether apoptosis-related proteins play a role in the evolution of CML and to identify, the relationship between Fas, p53 and apoptosis protease activating factor Apaf-1 in CML. We found increased p53 and Apaf-1 messenger ribonucleic acid mRNA in patients with CML. However, one patient, who had a p53 point mutation, showed a massive elevation of p53 mRNA during blast crisis yet, conversely, a considerable reduction in Apaf-1 mRNA and Fas mRNA. Our results show an in-vivo linkage between Fas, p53 and Apaf-1 transcription regulation. This suggests that key genes involved in apoptosis are also involved in CML disease progression.