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[Study on autophagy in nucleated red blood cells in patients with myelodysplastic syndromes].
Objective: To investigate the change of autophagy level of bone marrow nucleated red blood cell (RBC) in patients with myelodysplastic syndromes (MDS) . Methods: Fifty-four MDS patients and thirty-three controls were enrolled in this study. The mitophagy were observed by transmission electron microscopy (TEM) . The level of autophagy-associated protein LC3B in GlycoA(+) nucleated RBC was measured by flow cytometry. The expressions of ULK1 and mTOR mRNA in GlycoA(+) nucleated RBC were measured by real-time PCR. The expression of the mitochondrial outer membrane protein TOM20 in GlycoA(+) nucleated RBC was detected by Western blot. Results: Autophagosomes or autolysosomes were scarcely observed by TEM in MDS patients. The expression of LC3B in GlycoA(+) nucleated RBC in high-risk MDS patients (0.22±0.12) was significantly lower than that in normal controls (0.43±0.22, P <0.001) , and lower than that in low-risk MDS patients (0.40±0.16, P =0.001) . The expression of AMPK [0.26 (0.60) ] in GlycoA(+) nucleated RBC in high-risk MDS patients was significantly lower than that in controls [1.00 (2.07) , P <0.017) . The expression of ULK1 mRNA in GlycoA(+) nucleated RBC in high-risk MDS patients [0.27 (3.31) ] was significantly lower than that in controls [1.07 (4.41) , P <0.017]. The level of mTOR mRNA in GlycoA(+) nucleated RBC in high-risk MDS patients [1.82 (3.74) ] was significantly higher than that in controls [1.26 (1.38) , P <0.017]. The level of LC3B in GlycoA(+) nucleated RBC was negatively correlated with the HGB ( r =0.529, P =0.009) in high-risk MDS patients. The expression of mitochondrial outer membrane protein TOM20 in high-risk MDS patients was 9.42±4.42. Conclusion: Autophagy is impaired in nucleated RBC of MDS patients.
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