Comparation of resting brain regional homogeneity between patients with major depressive disorder and their healthy siblings / 中华行为医学与脑科学杂志

Objective:To explore differences of resting brain regional homogeneity (ReHo) between patients with major depressive disorder (MDD) and their siblings.Methods:From January to December 2013, the resting-state functional magnetic resonance imaging (fMRI) data of 87 patients with MDD and 21 healthy siblings were collected.DPABI v5.1 software was used to preprocess the resting-state fMRI data, and ReHo maps of each subject was obtained. A two-sample t-test was used to compare differences between the patients with MDD and their siblings in ReHo values throughout the brain. ReHo values within the significant brain regions were extracted out, and used to calculate Spearman correlation with the total score of 17-items Hamilton depression rating scale(HAMD-17) in the patients with MDD and their siblings respectively.The software of SPSS 20.0 was used for statistical analysis. Results:The patients with MDD exhibited lower ReHo values in the precuneus extending to the posterior cingulate cortex (PCu/PCC) compared with their siblings (cluster-size=126 voxel, cluster-level PFDR=0.033; MNI: x=-4, y=-58, z=38, t=4.30). ReHo values of the PCu/PCC in patient with MDD were positively correlated with the severity of depressive symptoms ( r=0.255, P=0.021). Conclusion:Compared with the siblings, local brain activity of the PCu/PCC in the patients with MDD was decreased, and related to the severity of depressive symptoms. It is helpful to further reveal the intrinsic neural mechanism of MDD.

Changes of microstructure of white matter and clinical high risk for psychosis / 中华行为医学与脑科学杂志

The research on clinical high-risk for psychosis is a hotspot in recent years, which is helpful to the early identification and early intervention of psychosis. White matter fibers are the important structural basis of complex information transmission function among brain regions. The existing literatures show that there are abnormal white matter microstructures in individuals at clinical high-risk for psychosis, which is related to their clinical symptoms and social function. Diffusion tensor imaging is the only non-invasive technique to study the microstructure of brain white matter. This paper reviews the existing evidences of microstructural abnormalities of white matter at clinical high-risk for psychosis by diffusion tensor imaging, in order to comprehensively analyze the potential neurobiomarkers in the early stage of the disease and the pathological evolution characteristics in the development of the disease.

Bipolar disorder and gut microbiota / 中华行为医学与脑科学杂志

Bipolar disorder is a chronic and severe mental disease, but its pathogenesis is still unknown.The disease is easy to relapse, and the cure rate is not ideal. The intestinal flora plays an important role in maintaining human health and regulating human function. The change of intestinal flora in human can directly or indirectly lead to the occurrence of a variety of diseases. And more and more studies have found that the intestinal flora of patients with many kinds of mental diseases and some of patients with physical diseases has obvious changes. Therefore, the in-depth study of brain-gut-flora axis has become a hot direction to explore the objective markers and pathogenesis of mental diseases. In this paper, the research progress of the relationship between intestinal microflora and bipolar disorder in recent years is reviewed. The changes of intestinal microflora in brain-gut-flora axis, bipolar disorder, the possible biological mechanism of bipolar disorder caused by intestinal microflora and the new discovery of treatment of bipolar disorder are discussed, which provides reference for further research and effective diagnosis and treatment of bipolar disorder biomarkers.

Role of homeobox gene A5 in multidrug resistance of human small cell lung cancer cells / 南方医科大学学报

<p><b>OBJECTIVE</b>To investigate the role of homeobox gene A5 (HOXA5) in multidrug resistance of human small cell lung cancer (SCLC) cells and the possibility of using HOXA5 as the therapeutic targets for SCLC treatment.</p><p><b>METHODS</b>We examined HOXA5 mRNA and protein expressions in chemosensitive human SCLC cells (H69) and the multidrug-resistant SCLC cells (H69AR) using quantitative real-time PCR and immunoblotting. HOXA5 expression was then enhanced or suppressed by transfection of the cells with HOXA5 expression plasmids or small interference RNA (siRNA), and the chemosensitivity of transfected cells to cisplatin (DDP) and etoposide (VP-16) was evaluated using cell counting kit-8 (CCK8) assay.</p><p><b>RESULTS</b>H69 cells showed a 8.99-fold higher expression of HOXA5 than H69AR cells. HOXA5 knockdown caused obvious reductions in the chemosensitivity of H69 cells to DDP and VP-16 with increased cells in G0/G1 phase; conversely, HOXA5 enhancement resulted in an increased sensitivity of H69AR cells to DDP and VP-16.</p><p><b>CONCLUSION</b>HOXA5 may play an important role in multidrug resistance of SCLC and can be a potential therapeutic target in clinical treatment of SCLC.</p>

Analysis of the increase of bone marrow prolymphocytes after complete remission in children with acute lymphoblastic leukemia / 白血病·淋巴瘤

Objective To investigate the clinical significance of bone marrow prolymphocytes increasing range from 5 ％ to 15 ％ after complete remission (CR) in children with acute lymphoblastic leukemia provide a prognosis index.Methods The cases of the children with acute lymphoblastic leukemia were analyzed retrospectively.They were divided into three groups,namely A group (N ≤ 5 ％),B group (5 ％ ＜ N ≤ 10 ％),C group (10 ％ ＜ N ≤ 15 ％) according to the bone marrow lymphoblast percentage,and their relapse rates were analysed.Results After the CR,the appearance of bone marrow prolymphocytes slightly increased in children with acute lymphoblastic leukemia accounted for 40.54 ％ (30/74).When the bone marrow prolymphocytes increased to 5 ％＜ N≤ 10 ％,the difference of relapse rates [21.05 ％ (4/19)] had no statistically significant compared with the negative control group [15.91％ (7/44)] (P =0.895),when they increased to 10 ％ ＜ N ≤ 15 ％,the difference of relapse rates [54.54 ％ (6/11)] had statistically significant compared with the negative control group (P =0.014).The difference of incidence rates of this slightly increasing between children' s B-ALL and T-ALL had no statistically significant (P =0.078).Conclusions The bone marrow prolymphocytes increase slightly (5 ％ ＜ N ≤ 10 ％) after CR in children with acute lymphoblastic leukemia might be the normal bone marrow B-lineage lymphocytes' reactive hyperplasia and the prognosis is relatively well.When the bone marrow prolymphocytes increase to 10 ％ ＜ N≤ 15 ％,these prolymphocytes are most likely to be leukemia cells and indicate the possibility of relapse.