Ultrastructural observation of blood-brain barrier in the nude mouse model of brain metastases from lung cancer / 中国实验动物学报

Objective To observe the ultrastructure of blood-brain barrier in the nude mouse model of brain me-tastases from lung cancer by transmission electron microscopy using lanthanum nitrate tracing.Methods PC-9 cells (1 × 106/0.1 mL) in logarithmic phase were respectively injected into six nude mice ( model group) selected from eight nude mice randomly via the left ventricle, the other two mice without any treatment as the control group.The general status of the mice was observed after implantation.In the fourth week all the mice were sacrificed and brain tissue samples were taken and prepared for transmission electron microscopic observation using lanthanum nitrate tracing.besides, the lung and brain were removed and stained with HE to detect the presence of tumor metastasis.Results Mice in the model group began to lose weight almost simultaneously in the third week and became moribund slowly, and were all sacrificed at the fourth week when showing clear signs of cachexia.At autopsy, the thoraxes were clear, with normal lungs.Histology showed evidence of brain metastasis in all the six mice.The electron microscopy showed that lathanum nitrate tracer was escaped from the capillaries and diffusely or sparsely distributed in the brain tissues of the model group mice, however lathanum nitrate tracer was still confined in the capillary lumen in the mice of control group.Conclusions The diffuse lathanum nitrate tracer in the brain parenchymal tissue indicates the impairment of blood-brain barrier in the nude mouse model of lung cancer brain metastasis and the formation of these metastases is accompanied with the destruction of blood brain barrier.

Operation and management countermeasures of Medical Electron Microscopy Laboratory / 中华医学科研管理杂志

Laboratory of electron microscopy is representative of large instruments laboratories in medical research.And the operation and management in this kind of laboratory are different.Case of forty years of operation and management in the medical laboratory of electron microscopy,this paper analyzed and summarized its successful experiences in the research management system,personnel system and the aspect of equipment maintenance management.Provide a management reference for medical research institutions with the laboratory of similar large-scale instruments.

Electron microscopic study on Trichomonas vaginalis adhering to and phagocytizing male genitourinary epithelial cells / 中华男科学杂志

<p><b>OBJECTIVE</b>To observe Trichomonas vaginalis (T. vaginalis) adhering to and phagocytizing male genitourinary epithelial cells in order to study the pathogenetic mechanism of male trichomoniasis.</p><p><b>METHODS</b>Cultured T. vaginalis bodies were incubated with male genitourinary epithelial cells, and then the ultrastructure was observed with transmission electron microscopy.</p><p><b>RESULTS</b>T. vaginalis adhered to epithelial cells like amoeba, and formed pseudopodium or surface invagination surrounding or nibbling other parts of the epithelial cytoplasm.</p><p><b>CONCLUSIONS</b>T. vaginalis has the speciality of adhering to and phagocytizing to male genitourinary epithelial cells. Genitourinary epithelial cells may be injured directly by the phagocytosis of T. vaginalis. Attention has to be paid to the correlation.</p>

Effect of Bugu Mixture on all-trans retinoic acid-induced apoptosis of bone marrow stromal cells / 中西医结合学报

OBJECTIVE: We used the SD rat's bone marrow stromal cells (BMSCs) cultured in vitro to observe the effects of Bugu Mixture on the apoptosis and to explore the molecular biologic mechanism of the treatment of osteoporosis with Bugu Mixture. METHODS: BMSCs were separated from the bones of the extremities of SD rats in vitro. The morphologic changes, the apoptosis cell cycles, the mitochondrion membrane potential changes, and the Bcl-2 and Bax gene expression were observed, and the effects of Bugu Mixture on the course of cell apoptosis were evaluated. RESULTS: The earlier use of Bugu Mixture could decrease the cells blocked in G0/G1 phase, and promote their synthesis of DNA in S phase. The expression of Bcl-2 was higher in the Bugu Mixture group than that in the all-trans retinoic acid (ATRA) induced group, and the expression of Bax was lower in the Bugu Mixture group than that in the ATRA induced group. The mitochondrion membrane potential descended significantly in the Bugu Mixture group than that in the ATRA induced group. CONCLUSION: The mechanism of the treatment of osteoporosis with Bugu Mixture is that the earlier use of Bugu Mixture can decrease the amount of apoptostic cells induced by ATRA, thus promoting the cell mitosis and restraining the apoptosis. It can also act as a protector to Bcl-2 located on the mitochondrion membrane. By preventing the transferring of the Bax protein from cell-plasma to mitochondrion membrane, it takes the advantage of Bcl-2 in forming Bcl-2/Bax homodimer so as to prevent the opening of the permeability transition pore to avoid the changing of mitochondrion membrane potential and the destruction of biosynthesis caused by the mitochondrion release of apoptosis inducing factors and to reach the objective of restraining apoptosis.

ULTRASTRUCTURE OF NEURAL STEM CELL NEUROSPHERE CULTURED in vitro / 解剖学报

Objective To study the ultrastructure of neural stem cell neurosphere cultured in vitro. Methods Neural stem cell neurospheres from the rat brain were observed under transmission electron microscope or with stain of lanthanum nitrate, ruthenium red and tannic acid. Results The conjunction between the cells within neurosphere was loose and no tight junction was observed. Neural stem cells were proliferating lively. Some neural stem cells differentiated into cells with process and structure of axon, even showed the structures similar to myelin.Conclusion The ultrastructure of neural stem cell neurosphere cultured in vitro was revealed.