Title : Caspases mediate retinoic acid-induced degradation of the acute promyelocytic leukemia PML/RARalpha fusion protein.

Pub. Date : 1998 Oct 1

PMID : 9746761






10 Functional Relationships(s)
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1 All-trans-retinoic acid (RA) treatment induces morphological remission in acute promyelocytic leukemia (APL) patients carrying the t(15;17) and expressing the PML/RARalpha product by inducing terminal differentiation of the leukemic clone. Tretinoin PML nuclear body scaffold Homo sapiens
2 All-trans-retinoic acid (RA) treatment induces morphological remission in acute promyelocytic leukemia (APL) patients carrying the t(15;17) and expressing the PML/RARalpha product by inducing terminal differentiation of the leukemic clone. Tretinoin PML nuclear body scaffold Homo sapiens
3 RA treatment induces downregulation of PML/RARalpha and reorganization of the PML-nuclear bodies. Tretinoin PML nuclear body scaffold Homo sapiens
4 RA treatment induces downregulation of PML/RARalpha and reorganization of the PML-nuclear bodies. Tretinoin PML nuclear body scaffold Homo sapiens
5 Here, we show that in the APL-derived NB4 cell line as well as in myeloid precursor U937 cells expressing the PML/RARalpha (U937/PR9) and in blasts from APL patients, the PML/RARalpha fusion protein is cleaved by a caspase 3-like activity induced by RA treatment. Tretinoin PML nuclear body scaffold Homo sapiens
6 In fact, a caspase 3-like activity is detectable in PML/RARalpha expressing cells after RA treatment, and selective caspase inhibitor peptides are able to prevent the RA-induced degradation of the fusion protein in vivo and in vitro. Tretinoin PML nuclear body scaffold Homo sapiens
7 In fact, a caspase 3-like activity is detectable in PML/RARalpha expressing cells after RA treatment, and selective caspase inhibitor peptides are able to prevent the RA-induced degradation of the fusion protein in vivo and in vitro. Tretinoin PML nuclear body scaffold Homo sapiens
8 Using recombinant caspases and PML/RARalpha deletion mutants we mapped a caspase 3 cleavage site (Asp 522) within the alpha-helix region of the PML component of the fusion protein. Aspartic Acid PML nuclear body scaffold Homo sapiens
9 The extent of PML/RARalpha cleavage directly correlates with the ability of RA to restore the normal PML nuclear bodies (NBs) pattern. Tretinoin PML nuclear body scaffold Homo sapiens
10 These results indicate that PML/RARalpha is directly involved in conferring RA sensitivity of APL cells and that the RA-induced reassembly of PML NBs is the consequence of the disappearance of PML/RARalpha. Tretinoin PML nuclear body scaffold Homo sapiens