Objective: To compare fibrosis-driving cells in patients with primary myelofibrosis (PMF) and patients with myelodysplastic syndromes (MDS) with myelofibrosis (MF) (MDS-MF) . Methods: Bone marrow biopsy sections of patients with newly diagnosed PMF and MDS (10 each randomly selected for MF-0/1, MF-2, and MF-3) were stained with specific immunofluorescence antibodies to label Gli1, LeptinR, alpha smooth muscle actin (α-SMA) , CD45, and ProcollagenⅠ. Images captured by confocal microscopy were analyzed by Fiji-ImageJ to calculate the cell counts of Gli1(+), LeptinR(+) cells, and fibrosis-driving cells including α-SMA(+), α-SMA(+)/Gli1(+), α-SMA(+)/LeptinR(+), and ProcollagenⅠ(+)/CD45(+) cells. Results: Patients with PMF and MDS with MF-2/3 had higher LeptinR(+), α-SMA(+), α-SMA(+)/Gli1(+), and Procollagen Ⅰ(+)/CD45(+) cell counts compared with those with MF-0/1 (all P values<0.05) . However, patients with PMF with MF-2/3 presented with higher Gli1(+) and α-SMA(+)/LeptinR(+) cell counts than those with MF-0/1 (P=0.001 and 0.006) , whereas these cells were similar between patients with MDS with MF-0/1 and MF-2/3 (P=0.169 and 0.067) . In patients with MF-0/1, all fibrosis-driving cells did not differ between PMF and MDS (all P>0.05) . However, in patients with MF-2/3, Procollagen Ⅰ(+)/CD45(+) cell counts were higher in patients with PMF compared with those with MDS (P=0.007) , while other fibrosis-driving cell counts were similar between these two groups (all P>0.05) . MF grade and fibrosis-driving cell counts were not correlated with overall survival in patients with either PMF or MDS. Conclusion: α-SMA(+) cells in patients with PMF originated from both Gli1(+) and LeptinR(+) cells, whereas α-SMA(+) cells in patients with MDS-MF only originated from Gli1(+) cells; patients with PMF had higher ProcollagenⅠ(+)/CD45(+) cell counts than those with MDS-MF.
目的： 比较原发性骨髓纤维化（PMF）和骨髓增生异常综合征伴骨髓纤维化（MDS-MF）患者纤维驱动细胞的差异。 方法： 随机选取MF-0/1、MF-2和MF-3级的初诊PMF和MDS患者各10例，骨髓活检组织切片利用特异性免疫荧光抗体标记Gli1、LeptinR、平滑肌肌动蛋白（α-SMA）、CD45和Procollagen Ⅰ，共聚焦显微镜成像后利用Fiji-ImageJ软件计数Gli1(+)、LeptinR(+)细胞及α-SMA(+)、α-SMA(+)/Gli1(+)、α-SMA(+)/LeptinR(+)和ProcollagenⅠ(+)/CD45(+)等纤维驱动细胞。 结果： MF-2/3级PMF和MDS患者LeptinR(+)、α-SMA(+)、α-SMA(+)/Gli1(+)和ProcollagenⅠ(+)/CD45(+)等细胞计数均显著高于MF-0/1级患者（P<0.05）。但MF-2/3级PMF患者Gli1(+)、α-SMA(+)/LeptinR(+)细胞计数显著高于MF-0/1级PMF患者（P值分别为0.001、0.006），而MDS患者中两组患者两群细胞计数差异无统计学意义（P值分别为0.169、0.067）。MF-0/1级患者中，PMF与MDS患者所有纤维驱动细胞计数相比差异均无统计学意义（P>0.05）。但MF-2/3级患者中，PMF患者ProcollagenⅠ(+)/CD45(+)计数显著高于MDS患者（P=0.007），其他纤维驱动细胞计数相比较差异均无统计学意义（P>0.05）。MF分级及纤维驱动细胞计数与PMF和MDS患者总生存时间无相关性。 结论： PMF患者α-SMA(+)细胞来源于Gli1(+)和LeptinR(+)细胞，而MDS-MF患者α-SMA(+)细胞仅来源于Gli1(+)细胞；PMF患者ProcollagenⅠ(+)/CD45(+)细胞计数显著高于MDS-MF患者。.
Keywords: Fibrosis-driving cells; Myelodysplastic syndromes with myelofibrosis; Primary myelofibrosis.