The effect of platelet infusion on the repair of bone marrow hematopoietic niche damage in mice induced by (60)Co radiation and hematopoietic reconstruction after bone marrow transplantation / 中华血液学杂志

Objective: To observe the effect of platelets on hematopoietic stem cell (HSCs) implantation in mice with radiation-induced bone marrow injury and bone marrow transplantation models. Methods: ①Male C57BL/6 mice were divided into a single irradiation group and a radiation infusion group after receiving (60)Co semimyeloablative irradiation for 18-10 weeks. The irradiation infusion group received 1×10(8) platelets expressing GFP fluorescent protein. ② The allogeneic bone marrow transplantation model was established. The experimental groups included the simple transplantation group (BMT) and the transplantation infusion group (BMT+PLT). The BMT group was infused through the tail vein only 5 × 10(6) bone marrow cells, the BMT+PLT group needs to be infused with bone marrow cells at the same time 1× 10(8) platelets. ③ Test indicators included peripheral blood cell and bone marrow cell counts, flow cytometry to detect the proportion of hematopoietic stem cell (HSC) and hematopoietic progenitor cells, bone marrow cell proliferation and apoptosis, and pathological observation of vascular niche damage and repair. Results: ①On the 3rd, 7th, 14(th), and 21st days after irradiation, the bone marrow cell count of the infusion group was higher than that in the single irradiation group (P<0.05), and the peripheral blood cell count was also higher. A statistically significant difference was found between the white blood cell count on the 21st day and the platelet count on the 7th day (P<0.05). In the observation cycle, the percentage of bone marrow cell proliferation in the infusion group was higher, while the percentage of apoptosis was lower. ② The results of bone tissue immunofluorescence after irradiation showed that the continuity of hematopoietic niche with red fluorescence was better in the irradiation infusion group. ③The chimerism percentage in the BMT+PLT group was always higher than that in the BMT group after transplantation.④ The BMT+PLT group had higher bone marrow cell count and percentage of bone marrow cell proliferation on the 7th and 28th day after transplantation than that in the BMT group, and the percentage of bone marrow cell apoptosis on the 14th day was lower than that in the BMT group (P<0.05). After the 14th day, the percentage of stem progenitor cells in the bone marrow cells of mice was higher than that in the BMT group (P<0.05). ⑤The immunohistochemical results of bone marrow tissue showed that the continuity of vascular endothelium in the BMT+PLT group was better than that in the BMT group. Conclusion: Platelet transfusion can alleviate the injury of vascular niche, promotes HSC homing, and is beneficial to hematopoietic reconstruction.

Research Progress on the Mechanism of Macrophages Regulating Hematopoiesis in Bone Marrow Microenvironment--Review / 中国实验血液学杂志

Bone marrow macrophage is an important component of bone marrow microenvironment, which is closely related to hematopoietic regulation and hematopoietic stem cell transplantation(HSCT). Recent studies have shown that bone marrow macrophage is an important part of hematopoietic stem cell niche, which can help regulate the mobilization and function of hematopoietic stem/progenitor cells. After HSCT, the microenvironment of bone marrow is damaged and a large number of macrophages infiltrate into the bone marrow. Regulating the macrophage-related signal pathways can promote the recovery of hematopoiesis and the reconstruction of hematopoietic function. Co-culture of macrophages and hematopoietic stem cells (HSC) in vitro significantly increased the number of HSCs and their ability of clone formation, which suggests that macrophages play an important role in the regulation of hematopoiesis in the hematopoietic microenvironment of bone marrow. This paper reviews the recent research progress on the role of macrophages in bone marrow hematopoietic microenvironment.

Research progress on the mechanism of bone marrow suppression after chemotherapy / 国际肿瘤学杂志

As an effective treatment for cancer, chemotherapy not only removes tumor cells, but also produces obvious killing effects on proliferating cells, especially hematopoietic cells, resulting in bone marrow suppression after chemotherapy, and affecting the effects of chemotherapy drug treatment and treatment cycle. Therefore, starting from the aspects of hematopoietic microenvironment damage and hematopoietic stem cell aging, to explore the mechanism of myelosuppression after chemotherapy, which provides new ideas and theoretical support for the intervention and management of bone marrow suppression after cancer chemotherapy.

Hematopoietic microenvironment and myeloproliferative neoplasms / 中国实用内科杂志

Besides supporting the normal hematopoiesis tissue, hematopoietic microenvironment has also been found to support malignant hematopoietic diseases and even play a role in the initiation and development of the diseases. Here we reviewed the function of hematopoietic microenvironment in physiological or pathological state, as well as its possible potential role in the initiation or development of the myeloproliterative neoplasms.

Progress of hematopoietic microenvironment / 白血病·淋巴瘤

The hematopoietic microenvironment provides an important place for hematopoietic stem cell (HSC) to self-renew, directional differentiation and maintain relative homeostasis, and it can regulate hematopoietic activity through various cellular components and factors. HSC is a primitive pluripotent stem cell in the blood system featured by the potential ability to self-renew for a long time and to differentiate into various mature blood cells, which exists in the bone marrow (BM). HSC plays an important role in regulating and maintaining the physiological balance of various cellular components of the blood system in the body, to ensure the continuous regeneration of the blood system. The hematopoietic microenvironment affects the development of HSC all the time, but the related cellular molecules and signals in the microenvironment still need to be studied in depth. This paper reviews the main components of the hematopoietic microenvironment, signaling pathways and the effects of abnormal changes on the diseases.

Total saponins of panax ginseng enhances the effect of osteoblast differentiation from mesenchymal stem cell on promoting hematopoiesis / 中国药理学通报

Aim To observe mesenchymal stem cell differentiation into osteoblast induced by TSPG, and explore how TSPG enhances the promotion of hemato-poiesis of osteoblast differentiation from mesenchymal stem cell. Methods MSCs were cultured by TSPG combined with osteoinductive medium. The cellular vi-ability of proliferation was detected with MTT assay. The content of alkaline phosphatase in the cultural su-pernatant was tested with pNPP assay. The ability of MSCs to form calcium nodes was also observed after a-lizarin red stain. The protein expression of RUNX2 was analyzed with Western blot. The content of cytokines associated with hematopoiesis was tested with Elisa as-say. The ability of promoting hematopoiesis was detec-ted with hematopoietic colony forming assay. Results Both MTT and pNPP assay showed that optical den-sity ( OD) values were increased in response to TSPG treatment in a dose-dependent manner. The mineraliza-tion formation ability was enhanced with TSPG-treat-ment. Meanwhile, the expression of RUNX2 protein was up-regulated in TSPG-treated cell. Moreover, the content of cytokines associated with hematopoiesis and the number of hematopoietic progenitor colony were in-creased by TSPG-treatment compared with the control group. Conclusion TSPG could induce MSCs differ-entiation in to osteoblast and enhance the effect of oste-oblast differentiation from MSCs on promoting hemato-poiesis.

Influence of Angelica Sinenisis Injection on Bone Marrow Histology and Ultrastructure in Immune-Induced Aplastic Anemia Mice / 实用儿科临床杂志

Objective To investigate the influence of angelica sinenisis injection on bone marrow histology and ultrastructure in immune-induced aplastic anemia(AA) mice.Methods Female Balb/c mice were divided into normal group,model group,therapy group and contrast group.All mice were killed by cutting neck on the 12 th day, ulnas and femur were taken out. The bone marrow histology section and ultrastructure of mice ulnas were observed. The quantities of hematopoietic cells were counted. The number of femur bone marrow mononucleate cells (MNC) were measured.Results The quantities of hematopoietic cells in model group were lower than those in normal group (P