Changes in Gray Matter Density, Regional Homogeneity, and Functional Connectivity in Methamphetamine-Associated Psychosis: A Resting-State Functional Magnetic Resonance Imaging (fMRI) Study.

BACKGROUND Using regional homogeneity (ReHo) blood oxygen level-dependent functional MR (BOLD-fMRI), we investigated the structural and functional alterations of brain regions among patients with methamphetamine-associated psychosis (MAP). MATERIAL AND METHODS This retrospective study included 17 MAP patients, 16 schizophrenia (SCZ) patients, and 18 healthy controls. Informed consent was obtained from all patients before the clinical assessment, the severity of clinical symptoms was evaluated prior to the fMRI scanning, and then images were acquired and preprocessed after each participant received 6-min fRMI scanning. The participants all underwent BOLD-fMRI scanning. Voxel-based morphometry was used to measure gray matter density (GMD). Resting-state fMRI (rs-fMRI) was conducted to analyze functional MR, ReHo, and functional connectivity (FC). RESULTS GMD analysis results suggest that MAP patients, SCZ patients, and healthy volunteers show different GMDs within different brain regions. Similarly, the ReHo analysis results suggest that MAP patients, SCZ patients, and healthy volunteers have different GMDs within different brain regions. Negative correlations were found between ReHo- and the PANSS-positive scores within the left orbital interior frontal gyrus (L-orb-IFG) of MAP patients. ReHo- and PANSS-negative scores of R-SFG were negatively correlated among SCZ patients. The abnormal FC of R-MFG showed a negative correlation with the PANSS score among MAP patients. CONCLUSIONS The abnormalities in brain structure and FC were associated with the development of MAP.

Role of CACNA1C gene polymorphisms and protein expressions in the pathogenesis of schizophrenia: a case-control study in a Chinese population.

The study aimed to investigate the correlations of CACNA1C genetic polymorphisms and protein expression with the pathogenesis of schizophrenia in a Chinese population. This research included 139 patients diagnosed with schizophrenia (case group) and 141 healthy volunteers (control group). Case and control samples were genotyped using denaturing high-performance liquid chromatography (DHPLC). Haplotypes of rs10848683, rs2238032, and rs2299661 were analyzed using the Shesis software. A mouse model of schizophrenia was established and assigned to test and blank groups. Western blotting was used to detect CACNA1C protein expression. The genotype and allele distribution of rs2238032 and rs2299661 differed between the case and control groups. TT genotype of rs2238032 and G allele of rs2299661 could potentially reduce the risk of schizophrenia. The distribution of rs2238032 genotype has a close connection with cognitive disturbance and the results of the general psychopathology classification exam. The distribution of rs2299661 genotypes was closely related to sensory and perceptual disorders, negative symptom subscales, and the results of the general psychopathology classification exam. CTC haplotype increased and CTG decreased the risk of schizophrenia in healthy people. In the brain tissues of mice with schizophrenia, the CACNA1C protein expression was higher in the test group than in the blank group. Our study demonstrated that CACNA1C gene polymorphisms and CACNA1C protein expression were associated with schizophrenia and its clinical phenotypes.

Clinical significance of decreased protein expression of dehydroepiandrosterone sulfate in the development of depression: a meta-analysis.

BACKGROUND: Previous evidence has shown that adrenal androgens, dehydroepiandrosterone (DHEA) and its sulfate derivative (DHEAS) have significant functions related to the control of mood, affect, and anxiety. Changes in their expression levels are reportedly related to several psychiatric disorders. The objective of this meta-analysis was to explore the role of DHEAS protein expression in patients with depression. METHOD: Web of Science, Cochrane Library, CISCOM, CINAHL, Google Scholar, China BioMedicine (CBM) and China National Knowledge Infrastructure (CNKI) were electronically searched. Only those studies that analyzing DHEAS expression in depression patients were considered eligible for inclusion. Standardized mean differences (SMDs) were pooled with a 95% confidence interval (CI) in accordance with the random-effects model. RESULTS: Ten clinical case-control studies, consisting of 4496 subjects (493 patients with depression and 4003 healthy controls) were incorporated for analysis. Results revealed a lower DHEAS protein expression level in patients with depression than in normal controls (SMD=0.17, 95% CI: 0.06-0.27, P=0.002). Ethnicity-stratified analysis indicated that lower levels of DHEAS expression in depression patients were not observed in Caucasians or Asians (both P>0.05). CONCLUSION: Elevated DHEAS protein expression may be correlated with the biological pathophysiology of depression, indicating that checking DHEAS levels and administration of DHEAS could contribute to the effective treatment of depression.

Influence of GNB3 C825T polymorphism on the efficacy of antidepressants in the treatment of major depressive disorder: A meta-analysis.

OBJECTIVE: We performed the present meta-analysis in order to evaluate the influence of a common polymorphism (C825T, rs5443 C>T) in the GNB3 gene on the efficacy of antidepressants in the treatment of major depressive disorder (MDD). METHOD: A relevant literature was searched using the PubMed, Embase, Web of Science, Cochrane Library, CISCOM, CINAHL, Google Scholar, CBM and CNKI databases without any language restrictions. STATA Version 12.0 software (Stata Corporation, College Station, Texas USA) was used for this meta-analysis. Odds ratio (OR) and its corresponding 95% confidence interval (95% CI) were calculated. RESULTS: Our findings suggested that the GNB3 C825T polymorphism was significantly correlated with a higher response rate to antidepressants in MDD patients under the allele and dominant models. Furthermore, we found significant associations between GNB3 C825T polymorphisms and antidepressant-induced remission in MDD patients. Ethnicity-stratified analysis indicated that GNB3 C825T polymorphisms may be strongly related to the efficacy of antidepressants in the treatment of MDD among Asians, but not in Caucasians (all P>0.05). CONCLUSION: Our findings provide empirical evidence that GNB3 C825T polymorphisms may be correlated with the efficacy of antidepressants in the treatment of MDD, especially among Asians patients.