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[Expression of MOST-1 mRNA in bone marrow mononuclear cells from patients with acute lymphoblastic leukemia]
Ju Gao1, Li-xing Yuan, Lei Sun
1Department of Pediatrics, West China Second Hospital, Sichuan University, Chengdu 610041, China.
Objective:
To investigate the MOST-1 mRNA expression in bone marrow (BM) mononuclear cells in children with acute lymphoblastic leukemia, and to explore its association with immunophenotype and treatment response.
Methods:
Semiquantitative RT-PCR was employed to study the MOST-1 mRNA expression in BM mononuclear cells separated by Ficoll density gradient method. The MOST-1 expression levels were represented by the ratio of MOST-1 band pixels against its corresponding housekeeping gene beta-actin mRNA band pixels determined by GDS8000 densitometry and GelWork-1 analysis software. The PCR product was eluted and sequenced, and its sequence was confirmed by Pairwise BLAST search.
Results:
A total of 17 children with acute lymphoblastic leukemia were studied. MOST-1 mRNA was exclusively expressed in the mononuclear cells from 3 patients with ALL-L3 type. However, there was no MOST-1 mRNA expression in other 14 children with ALL-L1 or ALL-L2, irrespective of their initial peripheral WBC count and blast cell percentage in peripheral blood and bone marrow. The MOST-1 mRNA expression levels in two of the ALL-L3 patients with higher blast cell percentages in peripheral blood and bone marrow were 3- and 2-fold respectively as compared with that in the third ALL-L3 child with lower initial blast cell load. MOST-1 mRNA expression was no longer detected in the two ALL-L3 children after complete remission with combination chemotherapy.
Conclusion:
MOST-1 was expressed in the bone marrow mononuclear cells in patients with ALL-L3, and its expression level was somewhat related to tumor cell burden. It might be implicated in the leukemogenesis of ALL-L3 and might serve as an indicator of tumor burden and thus a useful guide for clinical management.
Insights
MOST-1 mRNA is exclusively found in bone marrow cells of children with acute lymphoblastic leukemia L3 subtype. Its expression correlates with tumor burden and disappears upon remission, suggesting a role in leukemogenesis.
Area of Science:
- Molecular biology
- Oncology
- Pediatrics
Context:
- Acute lymphoblastic leukemia (ALL) is a heterogeneous hematologic malignancy.
- Understanding specific molecular markers in ALL subtypes is crucial for diagnosis and treatment.
- MOST-1 mRNA's role in pediatric ALL requires further elucidation.
Purpose:
- To investigate MOST-1 mRNA expression in bone marrow (BM) mononuclear cells of children with ALL.
- To determine the association of MOST-1 mRNA expression with ALL immunophenotype (specifically L1, L2, and L3 subtypes).
- To explore the relationship between MOST-1 mRNA levels and treatment response.
Summary:
- MOST-1 mRNA was exclusively detected in bone marrow mononuclear cells of pediatric patients with the ALL-L3 subtype.
- No MOST-1 mRNA expression was observed in ALL-L1 or ALL-L2 subtypes.
- Expression levels in ALL-L3 correlated with tumor cell burden and were undetectable after achieving complete remission.
Impact:
- MOST-1 may be implicated in the leukemogenesis of ALL-L3.
- MOST-1 mRNA expression could serve as a potential indicator of tumor burden in ALL-L3.
- This finding may guide clinical management strategies for pediatric ALL-L3.
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