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BACKGROUND: Bones are currently considered as an immune organ. A variety of immune cells that originate from the bone marrow can interact with the cells of the skeletal system to jointly regulate bone metabolism. Explorations on the pathogenesis of postmenopausal osteoporosis as well as treatment-related molecular targets and signal pathways can help prevention and treatment of the disease. OBJECTIVE: To investigate the expression profiles of immune-related genes in peripheral blood leukocytes of postmenopausal osteoporosis patients using RNA-Seq technology. METHODS: Forty female patients who had experienced menopause for 0 to 20 years and were hospitalized due to fractures were enrolled. They were divided into normal bone mass group (T >-1) and osteoporosis group (T 2), and 131 genes were up-regulated and 56 genes were down-regulated. We identified in total 29 differentially expressed immune-related genes including 25 up-regulated and 4 down-regulated ones. There was significant difference in expression between the osteoporosis and normal bone mass groups for genes, including KIR3DL1, KIR3DL2, KIR2DL4, KLRD1 and HSPA6 (P < 0.05). These differentially expressed genes are potentially important for the natural killer cell-mediated cytotoxicity by the KEGG pathway analysis. KIR3DL1, KIR3DL2, KIR2DL4, KLRD1 and HSPA6 may be closely related to the natural killer cell-mediated cytotoxicity during the occurrence of postmenopausal osteoporosis.
RESUMEN
<p><b>OBJECTIVE</b>To develop a method for determining plasma and renal tissue concentrations of cisplatin (DDP) after subcutaneous DDP implantation in mice.</p><p><b>METHODS</b>DDP was extracted from the plasma and tissue of mice receiving subcutaneous DDP implantation and reacted with sodium diethyldithiocarbamate (DDTC). The product Pt (DDTC)(2) extracted by diethyl ether was determined using high-performance liquid chromatography (HPLC) with the mobile phase of water and methanol at the ratio of 25:75 and the flow rate of 1.0 ml/min. The derivatives of DDP and nickel chloride were detected at the wavelength of 254 nm.</p><p><b>RESULTS</b>The linear range of DDP was 0.1-10 microg/ml (r=0.9998 for plasma and 0.9993 for kidney). The intra-day and inter-day RSD was below 10%, and the minimum concentration detectable was 50 ng.</p><p><b>CONCLUSION</b>The method is accurate and effective for determining plasma and tissue DDP levels after subcutaneous DDP administration and can be used in pharmacokinetic study of DDP.</p>