Research Progress of Intercellular Mitochondrial Transfer in the Development of Hematological Malignant Tumors --Review / 中国实验血液学杂志

In recent years, studies have found that mitochondrial transfer between leukemic cells and different types of cells in their bone marrow microenvironment, especially mesenchymal stem cells, plays a key role in the occurrence, development and drug resistance of hematological malignant tumors. This paper mainly introduces the role and latest research progress of mitochondrial transfer in acute and chronic myeloid leukemia, acute lymphoblastic leukemia and multiple myeloma, and briefly describes the mechanism of drug resistance caused by mitochondrial transfer in leukemic cells during chemotherapy. The aim is to provide a new idea and theoretical basis for using intercellular mitochondrial transfer as a potential therapeutic target.

Progress in promoting mechanism of tunneling nanotubes formation / 第二军医大学学报

Tunneling nanotubes (TNT) is a newly discovered connection mode between animal cells, and its formation is of great importance in physiological and pathological processes of animals and humans. The forming conditions and the promoting mechanism of TNT are not fully understood yet. It has been known that the state of cells (such as inflammatory conditions and stress reaction), molecular level (Fas ligand, cell adhesion molecules and the ligand interactions, M-Sec/TNFaip2/B94 and lipid molecules), and pathogenic infection are important for the formation of TNT. In this paper we reviewed the promoting mechanisms for TNT formation.

When morphogenetic proteins encounter special extracellular matrix and cell-cell connections at the interface of the renal stem/progenitor cell niche / 대한해부학회지

Reciprocal exchange of morphogenetic proteins between epithelial and mesenchymal cells in a stem/progenitor cell niche results in formation of a nephron. To maintain diffusion of morphogenetic proteins, it is assumed that a close contact exists between involved cells. However, recent publications underline that both types of stem/progenitor cells are separated by a striking interface. To explore this microarchitecture in detail, neonatal rabbit kidneys were fixed in traditional glutaraldehyde (GA) solution for transmission electron microscopy. For contrast enhancing specimens were fixed in GA solution including cupromeronic blue, ruthenium red or tannic acid. To record same perspectives, embedded blocks of parenchyma were cut in exactly orientated vertical and transverse planes to lining collecting ducts. Electron microscopy of specimens fixed by traditional GA solution illustrates a spatial separation of stem/progenitor cells and an unobstrusively looking interface. In contrast, advanced fixation of specimens in GA solution including cupromeronic blue, ruthenium red and tannic acid unmasks earlier not visible extracellular matrix. In addition, projections of mesenchymal cells covered by matrix cross the interface to contact epithelial cells. Surprisingly, the end of a mesenchymal cell projection does not dangle but is enclosed in a fitting sleeve and connected via tunneling nanotubes with the plasma membrane of an epithelial cell. Regarding this complex ensemble the question is to what extent illustrated cell-cell connections and extracellular matrix are involved in communication and transmission of morphogenetic proteins during induction of a nephron.

Progress of mechanotransduction in differentiation of bone marrow mesenchymal stem cells mediated by cellular mechanosensor and TNTs / 医用生物力学

With the regulation of mechanical microenvironment being realized as an important role playing in the differentiation of bone marrow mesenchymal stem cells (BMSCs), the systematic researches on stem cells are gradually deepened into the extended cellular biomechanical field, which lead to a hot research focus on cellular biomechanical properties, basic mechanical structure units and network-like mechanical architecture among cells. In this paper the analysis on mechanical properties of BMSCs and mechanical molecular basic research on integrins and cadherins are reviewed, and the main frame of network like mechanical regulation is speculated and constructed, combined with the internal bony structure and mechanical geometric properties of the tunneling nanotubes (TNTs). The possibility of synergistic effect among the above important mechanical structures in the network-like mechanical microenvironment is also investigated.

Cellular tunneling nanotubes and its significance / 白血病·淋巴瘤

Tunneling nanotubes(TNT) are cellular communication and transport mechanism discovered recently. TNTs play important role in immunological response and viral spread, also may involve embryonic development, regulation of gene expression and carcinogenesis. However, it was not easy to study TNT for clinical samples since intricate assay method for TNT. We suggested using histochemical assay PAS staining in cell drip to show TNT in leukemia and lymphoma samples.