RESUMO
The quality control and evaluation methods of Schizonepeta tenuifolia were established by HPLC fingerprint, multi index component content determination and chemical pattern recognition to provide basis for the quality control of medicinal materials. The chemical components of 25 batches of Schizonepeta tenuifolia panicle medicinal materials and decoction pieces collected were analyzed by high performance liquid chromatography, and the common pattern of fingerprint was established. A total of 22 common chromatographic peaks were calibrated, and their similarity was more than 0.9. The samples were divided into three categories according to different producing areas by cluster analysis. The results of principal component analysis and cluster analysis were consistent. Finally, five differential markers of different batches of Schizonepeta tenuifolia were selected by orthogonal partial least squares discriminant analysis. Through the identification of the reference substance, it was determined that peak 9 was hesperidin, peak 10 was rosmarinic acid, peak 13 was tilianin, peak 14 was quercetin, and peak 20 was pulegone. The quality evaluation method established in this study is stable and reliable, and is suitable for the quality control of Schizonepeta tenuifolia.
RESUMO
Objective·To investigate the influence of blocking receptor for advanced glycation end products (RAGE) on macrophages infiltration in diabetic wound healing. Methods·Ninety-six male C57BL/6J mice (8-week-old) were divided into diabetic group (n=72) and normal group (n=24) randomly. Diabetic mice were induced by streptozocin multiple intraperitoneal injection. One full-thickness excisional wound (diameter of 9 mm) was created by a sterilized punch. Diabetic mice were divided into 3 groups in which different topical treatments were applied to the wounds. Anti-RAGE antibody were applied in group R, rabbit IgG applied in group I, normal saline applied in group C. Normal mice were applied with saline topically (group N). All treatments were repeated on day 3 and day 7 after wounded. The wound healing conditions were observed. The wound and surrounding tissues from animals in each group were excised on day 1, 3, and 7 after wounded. Immunohistochemistry was utilized to investigate the changes of macrophages infiltration in quantity. Macrophages were also analyzed with respect to morphology by transmission electron microscopy (TEM). Results·① The wound closure ratio of group R was higher than those of group C and group I on day 14 after being wounded (P=0.000). ② On day 1, the numbers of macrophages in group R and group N were both bigger than those of group C and group I, but smaller on day 14 (P=0.000). ③ The morphological characters of macrophages also existed great differences under TEM. Conclusion·Number and morphology of macrophages are both abnormal in diabetic wound in a RAGE pathway depending manner. Based on macrophages, it suggests that impaired healing of diabetic wound is closely related to RAGE pathway.
RESUMO
<p><b>OBJECTIVE</b>To evaluate the effects of personality-related health risk factors on suicidal ideation among medical students.</p><p><b>METHODS</b>1204 medical students at first grade were selected in Beijing, using random cluster sampling method. Data were obtained through health risk behaviors questionnaire, personality diagnostic questionnaire-4 (PDQ-4) and were analyzed by logistic regression method.</p><p><b>RESULTS</b>There were 12 risk factors selected from single factor analysis, including physical fight, physical abuse, physically forced to have sexual intercourse, sexual risk behaviors, tobacco and alcohol use behaviors, loneliness, bad mood, insomnia, feeling hopeless, higher PDQ-4 score and internet abuse behaviors. Data from Unconditional logistic regression showed that the main risk factors of suicide ideation were insomnia (OR = 4.98), physical abuse (OR = 4.43), sexual risk behaviors (OR = 2.63), bad mood (OR = 2.32), feeling hopeless (OR = 1.98), higher PDQ-4 score (OR = 1.09) in male students; while fighting (OR = 7.10), loneliness (OR = 4.42), physically forced to have sexual intercourse (OR = 4.19), internet abuse behaviors( OR = 1.39) in female students.</p><p><b>CONCLUSION</b>Suicidal ideation was associated with various factors, with significant gender difference.</p>