RESUMO
This study was aimed to explore the expression of MIP-1alpha, MCP-1 and their receptors CCR-1, CCR-2 in bcr/abl fusion gene positive CML cells, and to study the effects of P210(bcr/abl) fusion protein tyrosine kinase on expression of MIP-1alpha, MCP-1 and their receptors CCR-1, CCR-2 mRNAs in chronic myeloid leukemia cells. The expression levels of MIP-1alpha, MCP-1 and their receptors CCR-1, CCR-2 mRNA were detected by semi-quantitative RT-PCR in bcr/abl negative cells, bcr/abl positive cells, and P210(bcr/abl)-Rb-C-Box positive cells. The results showed that MIP-1alpha and CCR-1 mRNAs were expressed in bcr/abl negative cells, but not in positive cells. Both MCP-1 and CCR-2 mRNA cannot be detected in both bcr/abl positive and negative cells. After inhibiting P210(bcr/abl) tyrosine kinase activity by Rb-C-Box, expressions of MIP-1alpha and CCR-1 mRNAs were restored to normal (similar to P210(bcr/abl) negative cells). It is concluded that P210(bcr/abl) fusion protein inhibits the expression of MIP-1alpha and CCR-1 in chronic myeloid leukemia cells, but does not inhibit MCP-1 and CCR-2 mRNA expressions in these leukemia cells.
Assuntos
Humanos , Quimiocina CCL2 , Genética , Quimiocina CCL3 , Quimiocina CCL4 , Leucemia Mielogênica Crônica BCR-ABL Positiva , Metabolismo , Proteínas Inflamatórias de Macrófagos , Genética , Receptores CCR1 , Receptores CCR2 , Receptores de Quimiocinas , Genética , Células Tumorais CultivadasRESUMO
<p><b>OBJECTIVES</b>To explore the effects of p210 bcr/abl fusion gene on expression of beta1 integrin and L-selectin mRNAs in mouse chronic myeloid leukemia (CML) cells.</p><p><b>METHODS</b>Comparisons of beta1 integrin and L-selectin mRNA levels among p210 bcr/abl negative, p210 bcr/abl positive, and p210 bcr/abl-Rb-C-Box positive cells were undertaken by quantity RT-PCR.</p><p><b>RESULTS</b>In p210 bcr/abl positive cells, L-selectin mRNA level was decreased, but beta1 integrin mRNA expression had no change as compared to those in p210 bcr/abl negative cells. When inhibition of bcr-abl tyrosine kinase activity by Rb-C-Box, the L-selectin mRNA expression restored to normal (similar to p210 bcr/abl negative cells).</p><p><b>CONCLUSION</b>p210 bcr/abl oncoprotein inhibits expression of L-selectin mRNA, but not of beta1 integrin mRNA.</p>