The RET receptor tyrosine kinase, but not its specific ligand, GDNF, is preferentially expressed by acute leukaemias of monocytic phenotype and is up-regulated upon differentiation
| Autor: | Valter Gattei, Emiliana Cesa, Antonio Pinto, Vittorina Zagonel, Angela De Iuliis, Donatella Aldinucci, Francesca Rossi, Massimo Degan, Francesca Tassan Mazzocco |
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| Rok vydání: | 1999 |
| Předmět: |
Receptor complex
Stromal cell endocrine system diseases Cellular differentiation Bone Marrow Cells Nerve Tissue Proteins Biology Proto-Oncogene Mas Cell surface receptor hemic and lymphatic diseases Glial cell line-derived neurotrophic factor Tumor Cells Cultured Humans Glial Cell Line-Derived Neurotrophic Factor Nerve Growth Factors RNA Messenger neoplasms Reverse Transcriptase Polymerase Chain Reaction Receptor Protein-Tyrosine Kinases Hematology Up-Regulation Cell Transformation Neoplastic Phenotype RET Gene Product Leukemia Monocytic Acute biology.protein Cancer research Stem cell Tyrosine kinase |
| Zdroj: | British journal of haematology. 105(1) |
| ISSN: | 0007-1048 |
| Popis: | The RET gene product represents the signal-transducing molecule of a surface receptor complex for the glial cell line-derived neurotrophic factor (GDNF), which includes GDNFR-alpha as a ligand-binding component. By a semi-quantitative competitive RT-PCR approach, we have analysed the relative abundances of RET transcripts in blasts purified from 40 acute myeloid leukaemia (AML) cases, revealing significant amounts of RET transcripts in 60% of AML cases (24/40). RT-PCR data was confirmed by immunocytochemical detection of RET protein in leukaemic blasts. The highest RET mRNA levels, almost exclusively confined to FAB M4/M5 AMLs, directly correlated with the presence on leukaemic cells of adhesion molecules and surface structures typically expressed by blasts of monocytic lineage and were inversely associated with the expression of the stem cell antigen CD34. Consistently, differentiation of the monoblastic cell line U937 resulted in an up-regulated expression of RET proto-oncogene, which was maximal upon exposure to agents inducing a more complete monocytic differentiation. Finally, while transcripts specific for GDNF and GDNFR-alpha were never found in leukaemic blasts, stromal cells of the haemopoietic microenvironment expressed, in the absence of RET, significant amounts of both GDNF and GDNFR-alpha. Our results suggest a role for RET in the functional regulation of AMLs through interactions with GDNF- and GDNFR-alpha-producing stromal cells. |
| Databáze: | OpenAIRE |
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