Effect of ATRA on the expression of genes Hoxb2 and Hoxb4 in cord blood erythroid progenitors / 中国实验血液学杂志

This study was aimed to investigate the expressions of genes hoxb2 and hoxb4 after interference of the proliferation and differentiation of hematopoietic stem cells (HSC) to the erythroid progenitors (CFU-E) in vitro by using all-trans retinoic acid (ATRA). The cord blood was collected from 12 cases of fetal placenta umbilical vein and cultured by using culture technique of HSC in vitro. The proliferation and differentiation of HSC to CFU-E were interfered with 6 x 10(-8) mol/L of ATRA. The expression levels of genes hoxb2 and hoxb4 in blank control and ATRA groups were detected by FQ-RT-PCR on day 3, 7 and 10 of culture. The results showed that the expressions of genes Hoxb2 and hoxb4 were a little on day 3, obviously increased on day 7 and reached highest level on day 10 in 2 groups. The expression level of hoxb4 on day 3, 7 and 10 in blank control group was obviously higher than expression level of hoxb2. As compared with blank control group, the expressions of genes hoxb2 and hoxb4 in the ATRA group were significantly up-regulated. It is concluded that the genes hoxb2 and hoxb4 all expressed in process of proliferation and differentiation to erythroid progenitors, which suggests that hoxb2 and hoxb4 relate to erythroid hematopoiesis, and the hoxb4 has more great relevance to erythroid hematopoiesis as compared with hoxb2. The ATRA (6 x 10(-8) mol/L) can up-regulate the expression of hoxb2 and hoxb4 significantly.

Effect of cluster a in Hox gene on proliferation and differentiation of hematopoietic stem/progenitor cells and its relation to leukemia -- review / 中国实验血液学杂志

In recent years, Research shows that cluster A of Hox gene family is a group of master genes for proliferation and differentiation of hematopoietic stem/progenitor cells (HSPCs), which influence on the number of hematopoietic stem cells and the differentiation of HSPCs into erythroid, myeloid, megakaryocytic and lymphocytic lineages, and are closely related with the pathogenesis of leukemia. In this review, the effects of gene Hox on proliferation and differentiation of HSPCs were concerned, while the epigenetics alterations of cluster A in Hox gene family as well as its coexistence with Non-HOX and other fusion genes were also discussed. This made cluster A in Hox gene family plays a regulatory role in pathogenesis of leukemia.

Evaluation of perioperative blood loss following total knee arthroplasty / 南方医科大学学报

<p><b>OBJECTIVE</b>To evaluate perioperative occult blood loss following total knee arthroplasty (TKA).</p><p><b>METHODS</b>A retrospective analysis of 40 patients undergoing TKA was conducted to calculate the mean blood loss and occult blood loss according to Gross formula.</p><p><b>RESULTS</b>The mean total blood loss was 1538 ml in these cases with occult blood loss of 791 ml. In patients with autologous blood transfusion, the mean total blood loss was 1650 ml with occult blood loss of 786 ml. In patients without autologous blood transfusion, the mean total blood loss was 1370 ml with occult loss of 798 ml.</p><p><b>CONCLUSION</b>TKA often results in large volume of occult blood loss in the perioperative period which can not be fully compensated by autologous blood transfusion, and additional blood supply is needed for maintenance of the circulating volume.</p>