FCGR3B copy number variation is not associated with lupus nephritis in a Chinese population

Copy number variation (CNV) is common in genomic regions encoding immune-related genes and can impact polygenic autoimmunity. FCGR3B CNV is associated with susceptibility to systemic autoimmunity in Caucasian populations. In this study, we examined FCGR3B CNV in patients with the autoimmune disease lupus nephritis (LN) in a Chinese population. The study includes 202 patients with histologically verified LN and 146 geographically matched healthy controls. To identify CNV at the FCGRB locus, quantitative polymerase chain reaction (PCR) was done with TaqMan( TM) probes and relative copy number was estimated with relative quantitative 2(-DeltaDeltaCt) method. The distribution of FCGR3B relative copy number did not differ significantly between the LN patients and the controls (1.17 +/- 0.42 for LN; 1.15 +/- 0.37 for controls; p = 0.627). The difference was still not significant when the data were stratified by gender. There was no significant difference when the LN patients were divided by pathological phenotype (proliferative LN compared with non-proliferative p = 0.511; AI < 12 compared with AI > or = 12, p = 0.401; and chronicity index (CI) < 4 compared with CI > or = 4, p = 0.058) or lupus disease activity index (SLEDAI < or = 10 compared with SLEDAI > 10, p = 0.996). The data suggest that FCGR3B CNV was not associated with LN development or progression in this Chinese population. These results were surprising given the strong in a Caucasian population.

FCGR2B gene polymorphism rather than FCGR2A, FCGR3A and FCGR3B is associated with anti-GBM disease in Chinese

BACKGROUND

The Fcgamma receptors play important roles in anti-glomerular basement membrane antibody disease (anti-GBM disease) in animal models, and FCGR gene polymorphisms have been reported to be associated with numerous human autoimmune diseases. We aimed to clarify the genetic association of FCGR gene polymorphisms with anti-GBM disease in Chinese patients.

METHODS

A total of 48 patients with anti-GBM disease and 225 geographically and ethnically matched healthy controls were involved. Genotyping of the previously identified polymorphisms FCGR2A131H/R (rs1801274), FCGR2B 232I/T (rs1050501) and FCGR3A176F/V (rs396991) were detected by the TaqMan genotyping assay and FCGR3B NA1/2 by the PCR-sequence specific primer (SSP). Allele type, genotype and haplotype of identified polymorphisms were analysed between patients and controls.

RESULTS

Our results revealed that FCGR2A131H/R, FCGR3A176F/V and FCGR3B NA1/2 were not associated with anti-GBM disease. The frequency of the FCGR2B 232T allele (30.2% versus 15.6%, corrected P = 0.00028, 95% CI: 1.42-3.89) and genotypes of I232T (60.4% versus 31.1%, corrected P = 0.0004, 95% CI: 1.78-6.43) was significantly increased in patients compared with controls.

CONCLUSION

The present study demonstrates the genetic association of polymorphism of FCGR2B (I232T) with susceptibility to anti-GBM disease in Chinese.

Association between polymorphisms in the FCGRT gene and lupus nephritis in Chinese patients

OBJECTIVE

Studies on mouse models have indicated that the neonatal Fc receptor (FcRn) plays important roles in a variety of autoimmune diseases. A variable number of tandem repeat (VNTR) polymorphisms within the FCGRT gene have been detected, and were found to affect the expression and functioning of FcRn. This study investigated the possible association of FCGRT VNTR polymorphisms with susceptibility and clinical manifestations in patients with lupus nephritis (LN).

METHODS

A total of 404 Han Chinese subjects, comprising 200 patients with LN and 204 geographically-matched healthy controls, participated in the study. The FCGRT VNTR polymorphism was genotyped by DNA amplification using a touchdown polymerase chain reaction followed by polyacrylamide gel electrophoresis.

RESULTS

The distribution of VNTR polymorphisms within the FCGRT gene in Chinese subjects was different to that in Caucasians. Analysis of allele and genotype frequencies revealed no significant difference between LN patients and controls. There was no significant difference in the clinical features or prognosis in LN patients when stratified by VNTR polymorphism.

CONCLUSION

Our results suggest that VNTR polymorphisms within the FCGRT promoter are not associated with LN in the Chinese population.

3D MPRAGE improves classification of cortical lesions in multiple sclerosis

BACKGROUND

Gray matter lesions are known to be common in multiple sclerosis (MS) and are suspected to play an important role in disease progression and clinical disability. A combination of magnetic resonance imaging (MRI) techniques, double-inversion recovery (DIR), and phase-sensitive inversion recovery (PSIR), has been used for detection and classification of cortical lesions. This study shows that high-resolution three-dimensional (3D) magnetization-prepared rapid acquisition with gradient echo (MPRAGE) improves the classification of cortical lesions by allowing more accurate anatomic localization of lesion morphology.

METHODS

11 patients with MS with previously identified cortical lesions were scanned using DIR, PSIR, and 3D MPRAGE. Lesions were identified on DIR and PSIR and classified as purely intracortical or mixed. MPRAGE images were then examined, and lesions were re-classified based on the new information.

RESULTS

The high signal-to-noise ratio, fine anatomic detail, and clear gray-white matter tissue contrast seen in the MPRAGE images provided superior delineation of lesion borders and surrounding gray-white matter junction, improving classification accuracy. 119 lesions were identified as either intracortical or mixed on DIR/PSIR. In 89 cases, MPRAGE confirmed the classification by DIR/PSIR. In 30 cases, MPRAGE overturned the original classification.

CONCLUSION

Improved classification of cortical lesions was realized by inclusion of high-spatial resolution 3D MPRAGE. This sequence provides unique detail on lesion morphology that is necessary for accurate classification.

[Effects of arsenic exposure through drinking water on methylation in persons]

OBJECTIVE

To observe the effects of arsenic exposure through drinking water on methylation in persons.

METHODS

The levels of inorganic arsenic (iAs), monomethylated arsenic (MMA), dimethylated arsenic (DMA) in blood and urine were detected by atomic absorption spectrophotometer with an arsenic speciation pretreatment system. Total arsenic (tAs), the first methylation index (PMI) and the second methylation index (SMI) were calculated as iAs+ MMA + DMA, (MMA+ DMA)/tAs and DMA/(MMA + DMA), respectively.

RESULTS

iAs, MMA, DMA, tAs and PMI in blood of exposed persons were more higher than those of control, while SMI was more lower than that of control. Significant positive correlations were found between urinary MMA and blood PMI (r = 0.419, P < 0.01), while significant negative correlations were found between urinary MMA and blood SMI (r = -0.326, P < 0.05). No significant differences were found in methylation capacity between men and women.

CONCLUSION

The arsenic methylation capacity of the persons exposed to arsenic was different from that of person non-exposed to arsenic, indicating an increase of PMI and decrease of SMI. There were no differences between sex in methylation capacity.

Pelvic ischemia is measurable and symptomatic in patients with coronary artery disease: a novel application of dynamic contrast-enhanced magnetic resonance imaging

INTRODUCTION

Pelvic ischemia can manifest as vascular-mediated erectile dysfunction (ED) and lower urinary tract symptoms (LUTS), and is associated with cardiac ischemia.

AIMS

We aimed to develop a dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) technique to measure pelvic perfusion in benign tissue.

METHODS

Nine men with coronary artery disease (CAD) were compared with nine without. Images were acquired at 3T with T1-weighted DCE-MRI for perfusion. Two-compartment pharmacokinetic modeling was employed to fit signal enhancement from prostate, corpus cavernosal, and spongiosal tissues.

MAIN OUTCOME MEASURES

Perfusion parameters and validated pelvic symptom scores were compared.

RESULTS

The mean International Index of Erectile Function (IIEF) total score was worse in CAD (41.3 +/- 19.7) vs. controls (59.4 +/- 14.9, P = 0.04). The IIEF erectile function domain score trended to worse in CAD (13.7 +/- 9.7) vs. controls (22.0 +/- 9.9, P = 0.09). The mean total International Prostate Symptom Score (IPSS) trended to worse in CAD patients (13.2) than controls (7.0) (P = 0.10). Magnetic resonance perfusion analysis demonstrated lower mean maximal percent enhancement to P < 0.0001 in the CAD group vs. controls for all the following comparisons: prostate in CAD (22.4 +/- 0.4) vs. controls (26.3 +/- 0.1); cavernosal tissue in CAD (9.3 +/- 0.2) vs. controls (16.6 +/- 0.8); and spongiosal tissue in CAD (20.6 +/- 1.2) vs. controls (24.0 +/- 0.6). Comparison of mean wash-in rates in the unit of 10(-3)/second was also highly significant (P < 0.0001 for all tissues): prostate in CAD (574.0 +/- 18.0) was lower than controls (1,035.0 +/- 29.0); slower wash-in rates were seen in CAD cavernosal (58.0 +/- 4.0 vs. 139.0 +/- 9.0 in controls) and spongiosal tissue (134.0 +/- 6.0 vs. 278.0 +/- 12.0 in controls).

CONCLUSION

These initial data demonstrate that pelvic perfusion can be measured in noncancerous tissues, and that perfusion correlates with validated measures of ED and LUTS.

[Correlation of TFRC polymorphism with the susceptibility and clinicopathologic phenotypes of IgA nephropathy]

OBJECTIVE

To explore the association of its polymorphism of TFRC with the susceptibility, clinical and pathologic phenotypes of IgA nephropathy.

METHODS

A total of 380 patients with IgA nephropathy and 250 normal controls were enrolled in the study. The regions with 424G/A and -5184C/T polymorphism sites of TFRC were amplified by PCR from genomic DNA and then the PCR-RFLP were performed by restriction enzymes, BanI and BsmA I, respectively. The genetic association of genotypes with the clinical and pathologic phenotypes was analyzed.

RESULTS

The distribution of frequency in TFRC was consistent with Hardy-Weinberg equilibrium; however, we found no significant difference in genotypes distribution between patients and controls. There were no differences between genotypes in age, blood pressure, 24 h urine protein excretion, serum creatinine, creatinine clearance and serum IgA. 424G/A and -5184C/T polymorphisms were associated with immunofluorescent intensity of IgA deposit in mesangial area, though there was no difference in pathological lesions evaluated by HAAS grade.

CONCLUSION

The polymorphisms of TFRC in 424G/A and -5184C/T sites were not associated with susceptibility to IgA nephropathy, but associated with density of immunofluorescence of IgA in mesangium in our large population based Chinese patients. The association of IgA nephropathy and other polymorphism sites, as well as interaction between TFRC polymorphism and other geneso polymorphisms, neededs to be further investigated.

The novel gene AngRem104 downregulates glucocorticoid receptor expression and activates NF-kappaB in human mesangial cells

AngRem104 [angiotensin II (Ang II)-related genes in human mesangial cells (MCs), clone104], a novel gene in human MCs induced by Ang II, was previously identified in human MCs and found to interact with several proteins. The current study used a yeast two-hybrid system and co-immunoprecipitation to investigate the interaction between AngRem104 and glucocorticoid receptor (GR) AF-1-specific elongation factor (GR-EF). GR expression was downregulated and the number of MCs positive for activated nuclear factor kappaB (NF-kappaB) was increased when AngRem104 was overexpressed. Transfection with antisense AngRem104 vector resulted in the upregulation of GR protein and reduced numbers of MCs with activated NF-kappaB. These results indicate that the novel gene AngRem104 is involved in the in vivo regulation of GR expression and the activation of NF-kappaB through interaction with GR-EF in human MCs.

[Approaches to detect the gene mutations in autosomal recessive Alport's syndrome: analysis of a family]

OBJECTIVE

To explore the gene diagnostic method for autosomal recessive Alport syndrome (AR-AS).

METHODS

Genomic DNA was extracted from the peripheral leukocytes of the proband of an AR-AS family. All the exons of COL4A3 and COL4A4 introns were amplified by PCR, and then the PCR products were sequenced by direct sequencing. Meanwhile, the mRNA of the coding region of type IV collagen alpha3 and alpha4 chain was extracted from the PBL and EB virus transfected cell and analyzed by using RT-PCR and sequencing to conform the genomic DNA analysis results.

RESULTS

PCR-sequencing analysis identified two novel COL4A3 mutations. One was a 5' donor splice site mutation (c. 3418 + 1 G to A) in exon 39, leading to the deletion of exon 39 in mRNA level by RT-PCR analysis. The other was a deletion mutation of 9 bp at exon 25 (c. 1729-1737 del9).

CONCLUSION

Both genomic-DNA-PCR-sequencing and mRNA-RT-PCR-sequencing methods can be carried out to detect the pathogenic mutations. In particular, mRNA-based approach can identify the changes in transcript level, therefore it is better than the genomic DNA-based method.

Cervical Spinal Cord Lesions in Multiple Sclerosis: T1-weighted Inversion-Recovery MR Imaging with Phase-Sensitive Reconstruction

This magnetic resonance (MR) imaging study was approved by the institutional review board and was HIPAA compliant. Written informed consent was obtained from all participants. The purpose of the study was to prospectively compare T1-weighted inversion recovery with short inversion time inversion recovery (STIR) and dual fast spin echo (FSE) for imaging cervical spinal cord lesions in patients with multiple sclerosis (MS). Twelve patients (eight men, four women; median age, 44 years) were imaged by using T1-weighted inversion recovery, STIR, and FSE. Contrast between lesions and normal cervical cord was measured for each sequence, and generalized estimating equation analysis was used to test statistical significance of the results. Normalized contrast between lesion and normal-appearing spinal cord was significantly higher for T1-weighted inversion recovery than for the other sequences (P < .0001). Use of phase-sensitive reconstruction improved lesion localization and boundary definition. These advantages of T1-weighted inversion recovery over STIR and dual-echo FSE suggest that it has potential in cervical spinal cord imaging of MS. (c) RSNA, 2007.

Improved identification of intracortical lesions in multiple sclerosis with phase-sensitive inversion recovery in combination with fast double inversion recovery MR imaging

BACKGROUND AND PURPOSE

Accurate detection and classification of purely intracortical lesions in multiple sclerosis (MS) are important in understanding their role in disease progression and impact on the clinical manifestations of the disease. However, detection of these lesions with conventional MR imaging remains a challenge. Although double inversion recovery (DIR) has been shown to improve the sensitivity of the detection of cortical lesions, this sequence has low signal-to-noise ratio (SNR), poor delineation of lesion borders, and is prone to image artifacts. We demonstrate that intracortical lesions can be identified and classified with greater confidence by the combination of DIR with phase-sensitive inversion recovery (PSIR) images.

MATERIALS AND METHODS

A total of 16 subjects with MS were included in this study. DIR, PSIR, and fluid-attenuated inversion recovery (FLAIR) images were acquired and inspected by 3 experts, with identification of lesions by consensus. PSIR and DIR images were jointly used to classify lesions as purely intracortical, mixed gray-white matter, and juxtacortical. The difference in the number of lesions detected in each category was compared between combined PSIR and DIR and conventional FLAIR.

RESULTS

PSIR consistently allowed a clearer classification and delineation of lesions. Combined PSIR and DIR images showed a 337% improvement in the total number of lesions detected compared with FLAIR alone. Detection of intracortical lesions was improved by 417% compared with FLAIR. Detection of mixed gray-white matter and juxtacortical lesions was improved by 396% and 130%, respectively, compared with FLAIR.

CONCLUSION

Reliable detection and classification of intracortical lesions in MS are greatly improved by combined use of PSIR and DIR.

Ubiquitinylation of Igβ Dictates the Endocytic Fate of the B Cell Antigen Receptor

In both infection and autoimmunity, the development of high-affinity Abs and memory requires B cells to efficiently capture and process Ags for presentation to cognate T cells. Although a great deal is known about how Ags are processed, the molecular mechanisms by which the BCR captures Ag for processing are still obscure. In this study, we demonstrate that the Ig beta component of the BCR is diubiquitinylated and that this is dependent on the E3 ligase Itch. Itch-/- B lymphocytes manifest both a defect in ligand-induced BCR internalization and endocytic trafficking to late endosomal Ag-processing compartments. In contrast, analysis of ubiquitinylation-defective receptors demonstrated that the attachment of ubiquitins to Ig beta is required for endosomal sorting and for the presentation of Ag to T cells, yet, ubiquitinylation is dispensable for receptor internalization. Membrane-bound Ig mu was not detectably ubiquitinylated nor were the conserved lysines in the mu cytosolic tail required for trafficking to late endosomes. These results demonstrate that ubiquitinylation of a singular substrate, Ig beta, is required for a specific receptor trafficking event. However, they also reveal that E3 ligases play a broader role in multiple processes that determine the fate of Ag-engaged BCR complexes.

A novel mutation of COL4A3 presents a different contribution to Alport syndrome and thin basement membrane nephropathy

BACKGROUND

Alport syndrome (AS) and thin basement membrane nephropathy (TBMN) are heterogeneous renal hereditary diseases. Mutations of COL4A3 and COL4A4 genes were reported to be the underlying pathogenicity in both diseases. However, the mechanism of the same mutation causing totally different clinical processes and outcomes in AS and TBMN is still not clear.

SUBJECTS AND METHODS

Mutations of all coding exons of COL4A3 and COL4A4 were screened in a patient with autosomal recessive Alport syndrome (ARAS) of a Chinese Han consanguineous family by means of PCR and direct sequencing. Furthermore, the identified mutation was validated by restriction endonuclease AvaII in all 20 members in his family, as well as 46 patients with TBMN, 2 patients with AS from another two families, and 50 healthy controls.

RESULTS

A novel missense mutation (3725G>A, G1242D) in exon 42 of COL4A3 was identified in the proband in the homozygous form. This pathogenic mutation was demonstrated in all carriers who presented with hematuria or mild proteinuria in the heterozygous form, whereas it was not detected in others whose urinalysis was normal within the family. In addition, 10 polymorphisms, including 1 non-glycine missense variant and 9 neutral polymorphisms, were detected in COL4A3/COL4A4.

CONCLUSION

The novel mutation (3725G>A, G1242D) of COL4A3 was the underlying pathogenic role in the homozygous form in ARAS and in the heterozygous form in TBMN within an identical family. The result provided a potentially useful clue for the functional investigation of COL4A3 in these two hereditary glomerular disorders.

[Clinical observation on effect of total glucosides of paeony in treating patients with non-systemic involved Sjögren syndrome]

OBJECTIVE

To investigate the efficacy and adverse reaction of total glucosides of paeony (TGP) in treating patients with non-systemic involved Sjögren syndrom (NSI-SS).

METHODS

Retrospective study was conducted on 27 patients with NSI-SS who received TGP treatment for over two years as the TGP group, and 20 patients received hydroxychloroquine sulfate (HCQs) for over two years in the HCQs group for positive control. Salivary flow, Schirmer's test and serum gamma-globulin at different time points, i.e. before treatment, and at the end of 1st, 3rd, 6th, 12th and 24th month respectively, were compared between groups, and adverse reactions associated with TGP and HCQ were also observed.

RESULTS

In the TGP group, saliva secretion was significantly increased and serum gamma-globulin decreased significantly from the 6th month (P <0.01), Schirmer's test improved significantly after 12 months (P< 0.01). While in the HCQs group serum gamma-globulin was significantly decreased from the 3rd month (P <0.01), saliva secretion and Schirmer's test improved significantly after six months (P<0.01). However, the 3 indexes determined at the end of the 3rd month were insignificantly different from those before treatment. Mild diarrhea occurred in 4 cases in the TGP group, they were improved two weeks later, but one case with severe diarrhea was dropped. While in the HCQs group, 2 patients were dropped, one for the raising of alanine aminotransferase at the 6th month and the other for decreased vision at the 9th month.

CONCLUSION

Efficacy of TGP is equivalent to that of HCQs in treating NSI-SS, but with higher safety and the effect initiating time being about 6 - 12 months.

Response to environmental flows in the lower Tarim River, Xinjiang, China: ground water

In China's west since the 1950s large-scale ecosystem degeneration has occurred through water diversions for agricultural purposes. Since 2000, 1038 x 10(6) m(3) of water have been released into the Tarim River with the result that water reached the terminal Taitema Lake for the first time in 30 years. This environmental flow raised water-table levels along 350 km of the river. To assess the response of the water-table, a comparison "pristine" site is compared with downstream monitored sites. The results show huge changes in water-table levels. The study verifies that the water-table is extremely responsive to environmental flows, that strong internal similarities exist along the length of the river, and that the effect on the water-table and hence likely riparian vegetation recovery can be tentatively predicted. The actual impacts of the restoration strategy are less than those originally expected politically, socially and within the scientific community. We make recommendations on more effective release strategies.

Response to environmental flows in the Lower Tarim River, Xinjiang, China: an ecological interpretation of water-table dynamics

Increased water-dependent development and utilization have led to significant environmental and hydrological degradation of the Tarim River in western China and its dependent ecosystems. Between the 1950s and 1970s, 350 km of the lower reaches were drained and between 1960 and 1980 the water-table fell from between -2 and -3 m to between -8 and -10 m. Subsequently, riparian ecosystems were seriously degraded. In 2000, the Chinese government launched a program to restore the lower reaches of the river. Four environmental flows of 1034 x 10(6) m(3) were released from 2000 to 2002. This paper interprets and discusses the ecological significance of changes following the releases and identifies the relationship between water-table dynamics and vegetation responses. Short-term objectives for river restoration are proposed with possible monitoring parameters suggested.

Dynamic contrast-enhanced MRI study of male pelvic perfusion at 3T: Preliminary clinical report

PURPOSE

To detect male pelvic perfusion in patients with coronary artery disease (CAD) vs. controls by dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) at 3T.

MATERIALS AND METHODS

Eighteen male patients were studied with T1-weighted (T1W) DCE-MRI to measure perfusion, phase-contrast (PC) imaging to measure bulk flow, and contrast-enhanced (CE)-MRA to detect stenosis. Regions of interest (ROIs) in prostate, corpus cavernosal, and spongiosal tissues were analyzed. Two-compartment pharmacokinetic modeling was employed to fit the signal enhancement. Perfusion parameters were analyzed by curve-fitting and utilized to compare the CAD and control groups. Validated questionnaires measuring urinary and erectile function were used to evaluate pelvic symptomatology in both groups.

RESULTS

Mean perfusion analysis confirmed weaker and slower enhancement in CAD patients vs. controls despite equivalent cardiac output values. The mean maximum enhancement was 26.33 +/- 0.12 (controls) vs. 22.38 +/- 0.44 (CAD) for prostate. The mean wash-in rate in units of minute(-1) was 62.10 +/- 1.74 (controls) vs. 34.44 +/- 1.08 (CAD) for prostate, 16.68 +/- 0.72 (controls) vs. 8.04 +/- 0.36 (CAD) for spongiosal, and 8.34 +/- 0.54 (controls) vs. 3.48 +/- 0.24 (CAD) for cavernosal tissues (all with P < 0.0001).

CONCLUSION

This preliminary study demonstrates that perfusion parameters differ between CAD and control patients, and the findings mirror the differences in pelvic symptoms in these groups.

B cell antigen receptor signaling and internalization are mutually exclusive events

Engagement of the B cell antigen receptor initiates two concurrent processes, signaling and receptor internalization. While both are required for normal humoral immune responses, the relationship between these two processes is unknown. Herein, we demonstrate that following receptor ligation, a small subpopulation of B cell antigen receptors are inductively phosphorylated and selectively retained at the cell surface where they can serve as scaffolds for the assembly of signaling molecules. In contrast, the larger population of non-phosphorylated receptors is rapidly endocytosed. Each receptor can undergo only one of two mutually exclusive fates because the tyrosine-based motifs that mediate signaling when phosphorylated mediate internalization when not phosphorylated. Mathematical modeling indicates that the observed competition between receptor phosphorylation and internalization enhances signaling responses to low avidity ligands.

The B cell receptor (BCR) is responsible for both the internalization of pathogens by B cells and for B cell activation signaling; internalization and activation signaling are mutually exclusive events for an individual BCR.

Diffusion tensor imaging in polymicrogyria: a report of three cases

INTRODUCTION

Polymicrogyria (PMG), a neuronal migration disorder, commonly manifests as a seizure disorder. The aim of this study was to look for the abnormalities in the underlying white matter using diffusion tensor imaging (DTI) that appeared normal on conventional magnetic resonance imaging (MRI) in patients with PMG.

METHODS

DTI was performed in three patients with PMG and eight age- and sex-matched healthy controls. Fractional anisotropy (FA) and mean diffusivity (MD) values were calculated for the cortex and adjoining subcortical white matter in both controls and patients.

RESULTS

We observed a significantly decreased mean FA value with no significant change in the MD value in subcortical white matter underlying polymicrogyric cortex (FA = 0.23+/-0.04, MD = 1.0+/-0.05 x 10(-3) mm(2)/s) as compared to both contralateral (FA = 0.32+/-0.04, MD = 1.0+/-0.05 x 10(-3) mm(2)/s) and normal control (FA = 0.32+/-0.04, MD = 1.0+/-0.06 x 10(-3) mm(2)/s) white matter. Significantly increased MD and decreased FA values were also observed in the polymicrogyric cortex (FA = 0.08+/-0.01, MD = 1.2+/-0.10 x 10(-3) mm(2)/s) as compared to normal contralateral (FA = 0.12+/-0.04, MD = 1.1+/-0.09 x 10(-3) mm(2)/s) and normal control (FA = 0.12+/-0.01, MD = 1.1+/-0.09 x 10(-3) mm(2)/s) cortex.

CONCLUSION

Significantly decreased FA values with no change in MD values in the subcortical white matter subjacent to polymicrogyric cortex reflect microstructural changes in the white matter probably due to the presence of ectopic neurons.

Synergistic antitumor effect of tumor necrosis factor-related apoptosis-inducing ligand combined with cisplatin in ovarian carcinoma cell lines in vitro and in vivo

Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) has been shown to exert selectively cytotoxic activity against many tumor cells but not normal cells. In this study, we evaluated the antitumor activity of TRAIL and cisplatin (CDDP) both separately and combined in the human ovarian cancer cell lines. In vitro study showed that TRAIL elicited significant cell apoptosis of cell lines 3AO, SKOV3, and OVCAR3 in a dose- and time-dependent manner (P < 0.05), while normal ovarian epithelial cells were resistant; this toxicity-free effect may be the result of upregulation of TRAIL receptors DcR1 and DcR2. Combined TRAIL and CDDP therapy produced more profound cell killing in 3AO cells than each alone (P < 0.05), and CDDP could upregulate the expression of both death and decoy TRAIL receptors. To further evaluate the apoptosis-inducing effects of TRAIL and the combination therapy, the abdominally and subcutaneously spread tumors in nude mice via inoculation of 3AO cells were established, and treatment of TRAIL resulted in a dose- and time-dependent inhibition of tumor growth while slight damage was observed in normal tissues. Furthermore, combined TRAIL and CDDP therapy had a synergistic effect in the regression of established ovarian cancer xenografts than TRAIL treatment alone (P < 0.05). We also examined the apoptosis-related gene expression in the transplantation tumors after TRAIL treatment, and the data suggested that the intracellular mechanism of TRAIL may be associated with downregulation of Bcl-2 and upregulation of CD95 and Apo2.7.

Tandem repeats polymorphism of MUC20 is an independent factor for the progression of immunoglobulin A nephropathy

MUC20, an upregulated novel gene in the renal tissues of patients with IgA nephropathy (IgAN), was recently identified. The variable number of tandem repeats (VNTR) polymorphism of the MUC20 gene was detected in several cell lines. In the present study, we investigated a possible association of MUC20 VNTR polymorphism with the clinical manifestations and progression in patients with IgAN. A total of 1,147 Chinese subjects, including 657 patients with IgAN and 490 geographically matched healthy controls, were involved in this investigation. One hundred and thirty-seven patients had been followed up for 60.6 +/- 22.4 months. MUC20 VNTR polymorphism was genotyped by polymerase chain reaction amplification and confirmed by sequencing. The alleles were divided into two groups according to the repeat times of MUC20 VNTR, i.e. small alleles (VNTR repeat times < or = 3) and large alleles (VNTR repeat times >3), and the genotypes of subjects were classified into SS, SL and LL groups. The frequencies of the alleles and genotypes of MUC20 VNTR polymorphisms did not differ between patients with IgAN and healthy controls. Additionally, there was no significant difference in the clinical features. Furthermore, IgAN patients with SL/LL genotypes had a higher risk of decline in renal function (odds ratio 20.9; 95% confidence interval 2.6-168.1; p = 0.004) than those with SS genotypes. The present study revealed that there is no association between the VNTR polymorphism of the MUC20 gene and the clinical manifestations in IgAN patients at the time of renal biopsy. However, IgAN patients with SL/LL genotypes had a higher risk of the progression to end-stage renal disease.

Advocacy skills training for young adult cancer survivors: the Young Adult Survivors Conference at Camp Māk-a-Dream

GOALS OF THE WORK

This manuscript reports on the design, implementation, and evaluation of the Young Adult Survivor Conference (YASC)-a 4-day retreat designed to provide an educational and support experience for cancer survivors diagnosed as children, adolescents, and young adults. The goals of the program were to address issues of survivorship, provide cancer education and tools for self-advocacy, and build bridges of support among young adult cancer survivors who may be experiencing similar journeys through life.

THE PROGRAM

YASC was designed to offer advocacy skills specific to participants' needs. Workshops focused on understanding late effects, mentoring and communication, tips for starting peer support programs and networks, and opportunities for offering public testimony and involvement in public policy.

EVALUATION

Program evaluation indicated that participants achieved personal goals and expectations for having fun, meeting other survivors, understanding more about their cancer and potential late effects, and learning about how to tell their story so that it will help others.

CONCLUSIONS

Involvement with peers who have shared a similar experience provided participants an opportunity to address areas of concern such as coping with uncertainty, dependency vs autonomy, social exclusion, body image, intimacy, sexuality and fertility, and career options. Participation in programs such as the YASC offers young survivors opportunities for life experiences that may promote successful achievement of age-appropriate developmental tasks.

Mutation of critical GIRK subunit residues disrupts N- and C-termini association and channel function

The subfamily of G-protein-linked inwardly rectifying potassium channels (GIRKs) is coupled to G-protein receptors throughout the CNS and in the heart. We used mutational analysis to address the role of a specific hydrophobic region of the GIRK1 subunit. Deletion of the GIRK1 C-terminal residues 330-384, as well as the point mutation I331R, resulted in a decrease in channel function when coexpressed with GIRK4 in oocytes and in COS-7 cells. Surface protein expression of GIRK1 I331R coexpressed with GIRK4 was comparable with wild type, indicating that subunits assemble and are correctly localized to the membrane. Subsequent mutation of homologous residues in both the GIRK4 subunit and Kir2.1 (Gbetagamma-independent inward rectifier) also resulted in a decrease in channel function. Intracellular domain associations resulted in the coimmunoprecipitation of the GIRK1 N and C termini and GIRK4 N and C termini. The point mutation I331R in the GIRK1 C terminus or L337R in the GIRK4 C terminus decreased the association between the N and C termini. Mutation of a GIRK1 N-terminal hydrophobic residue, predicted structurally to interact with the C-terminal domain, also resulted in a decrease in channel function and termini association. We hypothesize that the hydrophobic nature of this GIRK1 subunit region is critical for interaction between adjacent termini and is permissive for channel gating. In addition, the homologous mutation in cytoplasmic domains of Kir2.1 (L330R) did not disrupt association, suggesting that the overall structural integrity of this region is critical for inward rectifier function.

Spi-1 and Spi-B control the expression of the Grap2 gene in B cells

The Ets family members Spi-1 and Spi-B have been implicated in the regulation of genes important for B cell antigen receptor (BCR) signaling. Mice deficient in Spi-B exhibit reduced B cell proliferation in response to BCR cross-linking and impaired T cell-dependent immune responses. This defect is exacerbated in the presence of Spi-1 haplo-insufficiency (Spi1+/- SpiB-/-). Tyrosine phosphorylation and calcium mobilization induced by BCR engagement is diminished in Spi1+/- SpiB-/- B lymphocytes, although many key BCR signaling proteins are expressed, suggesting that Spi-1 and Spi-B regulate expression of additional, unidentified signaling molecules. We now demonstrate that expression of the adaptor protein Grap2 is impaired in Spi1+/- SpiB+/- and Spi1+/- SpiB-/- B lymphocytes. Analysis of two alternate murine Grap2 promoters revealed a functionally important Spi-1 and Spi-B DNA binding element located in the downstream promoter. Ectopic expression of Grap2 in Grap2-deficient B cells reduced the recruitment of BLNK to Igalpha and the phosphorylation of specific substrates. Regulation of BLNK recruitment was dependent upon the Grap2 proline-rich domain, while modulation of phosphorylation was dependent upon both the proline-rich and SH2 domains. These data indicate that Spi-1 and Spi-B directly regulate the expression of Grap2 and that Grap2 functions to modulate BCR signaling, but that reduced Grap2 expression is unlikely to account for the BCR signaling defects observed in Spi1+/- SpiB-/- B cells.

Phase-sensitive T1 inversion recovery imaging: a time-efficient interleaved technique for improved tissue contrast in neuroimaging

BACKGROUND AND PURPOSE

High tissue contrast and short acquisition time are desirable when scanning patients. The purpose of this report is to describe the implementation of a new technique for generating high gray matter (GM) and white matter (WM) contrast in a short scan time, make a quantitative evaluation of the contrast efficiency, and explore its potential applications in neuroimaging.

METHOD

A fully interleaved T1-weighted inversion recovery (T1IR) sequence with phase-sensitive reconstruction (PS-T1IR) is implemented. This sequence is compared with conventional T1-weighted spin-echo imaging (T1SE) and T1-weighted fluid-attenuated inversion recovery (T1FLAIR). The time efficiency and contrast enhancement have been quantitatively analyzed in normal volunteers. The performance of the sequence is evaluated in >30 patients with neurologic disorders. The sensitivity of PS-T1IR relative to T1SE in detecting gadolinium enhancements is also evaluated.

RESULTS

PS-T1IR is more time-efficient than T1SE and generates better GM-WM contrast. It results in the best contrast-to-noise ratio (CNR) efficiency (1.16) compared with T1FLAIR (0.73) and T1SE (0.23). For a typical clinical protocol, PS-T1IR takes only 1:30 minutes versus 2:40 minutes for T1SE imaging for the whole brain coverage. Although gadolinium enhancements are detected with comparable sensitivity on both PS-T1IR and T1SE sequences, in certain instances, the latter sequence appears to be more sensitive in demonstrating gadolinium enhancements within WM.

CONCLUSION

PS-T1IR has the highest CNR efficiency compared with T1FLAIR and T1SE. It is a very practical technique for neuroradiologic applications.

[Variable number of tandem repeats polymorphism of MUC20 is associated with the progression of IgA nephropathy]

OBJECTIVE

The MUC20 gene is a novel up-regulated gene that was identified in renal tissues of patients with IgA nephropathy (IgAN) by restriction endonucleolytic analysis of differentially expressed sequences. The variable number of tandem repeats (VNTR) polymorphism of MUC20 was detected in different cell lines. In this study we determined the distribution of MUC20 VNTR polymorphism in the healthy population, and the association between the MUC20 VNTR polymorphism and the pathogenesis or progression of IgAN.

METHODS

282 healthy and 503 proved IgAN patients by biopsy were involved in this investigation. 113 patients had been followed-up for 3.5 +/- 1.5 years. Genomic DNAs were extracted from peripheral blood leucocytes. MUC20 VNTR polymorphism was detected by PCR amplification and several representational PCR products were confirmed by sequencing. The MUC20 genes were divided into small alleles (repeat times <or= 3) and large alleles (repeat times > 3) according to the repeat times of MUC20 VNTR. These patients were classified into group SS, SL and LL. MUC20 allele frequencies and genotypes of IgAN patients were analyzed and compared with healthy population. In addition, the associations of MUC20 polymorphism with the clinical and pathological parameters at the time of renal biopsy were analyzed. The data followed up in different groups were compared.

RESULTS

There was MUC20 VNTR polymorphism in healthy population with 2 - 6 repeats. The repeat fragment was 57bp. The most frequent alleles included 3(R(3)) and 4(R(4)) repeats; otherwise the least ones included 6(R(6)) repeats. The most frequent genotype was R(3)R(4), then R(3)R(3) and R(4)R(4); the least ones were R(2)R(2), R(3)R(6) and R(5)R(5). The frequencies of MUC20 alleles and genotypes in the IgAN patients were similar to healthy population. Initial ages, blood pressure, proteinuria, and renal function did not differ significantly among the three groups. There was no difference of the urinary osmotic pressure, urinary NAG (N-acetyl-B-D-glucosaminidase) and alpha1 microglobulin (alpha1-MG), and the semiquantitative scores of renal interstitial fibrosis and tubular atrophy in the three groups. IgAN patients with SL/LL genotype had higher odds ratio for progression of renal function (OR = 7.29, 95% CI: 1.68 - 31.60, P = 0.008) than the SS genotype.

CONCLUSIONS

There were MUC20 VNTR polymorphisms in the healthy population. The polymorphism did not associate with the pathogenesis and the clinico-pathological parameters at the time of renal biopsy. The SL/LL genotype was likely to be a risk factor for rapid progression of renal function in the patients with IgAN.

Replacement of the membrane proximal region of I-Ad MHC class II molecule with I-E-derived sequences promotes production of an active and stable soluble heterodimer without altering peptide-binding specificity

The MHC class II molecule I-A is the murine homologue of HLA-DQ in humans. The I-A and DQ heterodimers display considerable heterodimer instability compared with their I-E and HLA-DR counterparts. This isotype-specific behavior makes the production of soluble I-A and DQ molecules very difficult. We have developed a strategy for production of soluble I-A(d) molecules involving expression of I-A(d) as a glycosil phosphatidyl inositol (PI) anchored chimera in Chinese Hamster Ovary (CHO) cells. The regions comprising the membrane proximal segments of I-A(d) alpha and beta chains were substituted for the corresponding regions of I-E, and the derived constructs were expressed in CHO cells. Procedures for purification of the soluble class II molecules were optimized and the WT and chimeric molecule were compared for structure, biochemical stability and functionality. Our analysis revealed that the substitutions in the membrane proximal domains improved cell surface expression and thermal stability of I-A(d) without altering the peptide binding specificity of the class II molecule. The results suggest that similar strategies could be used to increase the stability of other unstable class II molecules for in vitro studies.

B-cell antigen receptor signaling requirements for targeting antigen to the MHC class II presentation pathway

The ability of B lymphocytes to capture, process and present antigens to T cells is requisite for normal humoral immune responses and contributes to the pathogenesis of both B- and T-cell-mediated autoimmune diseases. B lymphocytes preferentially capture polyvalent antigens, which are capable of eliciting a coordinated series of cellular responses that ensure that even low-affinity antigens are productively captured. Polyvalency not only accelerates transit through the endocytic pathway but also induces a reorganization of the antigen-processing compartment, activates degradative pathways and determines how antigenic peptides are presented to T cells. Similar changes are observed in maturing dendritic cells, indicating that some cellular responses to foreign antigens are conserved.

[Clinical significance of heparanase and basic fibroblast growth factor expression in human non-small cell lung cancer]

OBJECTIVE

To assess protein and mRNA expression levels of heparanase and basic fibroblast growth factor (bFGF) genes in human non-small cell lung cancer (NSCLC) and their roles in tumor invasion, metastasis and prognosis.

METHODS

A total of 115 paraffin-embedded and 45 fresh-frozen tissue specimens of NSCLC were studied by immunohistochemistry, Western Blot and in situ hybridization to evaluate the protein and mRNA expression status of heparanase and bFGF genes. The data was analyzed by SPSS statistical software.

RESULTS

Both human heparanase and bFGF were highly expressed in NSCLC cells, in contrast to none or a low expression in normal lung tissue. Expression of heparanase also showed a significantly higher than that in the normal tissue by Western blot (P = 0.041). Immunohistochemistry showed that heparanase expression was both cytoplasmic and membranous. The agreement between heparanase and bFGF was significant. A significant correlation was found between the expression of either protein and TNM stage, vascular invasion, lymphatic metastasis and microvascular density (MVD). Co-expression of the two proteins demonstrated an even higher correlation with the tumor stage and MVD. In addition, expression of bFGF correlated with tumor cell differentiation. Data of a multivariate analysis indicated that tumor cell differentiation, vascular invasion, lymphatic metastasis and expression of bFGF were identified as significant prognostic parameters.

CONCLUSIONS

Both heparanase and bFGF may play important roles in tumor angiogenesis, metastasis, and prognosis of NSCLC.

[Construction of sense and antisense eukaryotic expression vector of novel gene Collectrin and its function in cell growth]

OBJECTIVE

To construct sense and antisense eukaryotic expression vector of novel gene Collectrin and identify its function in cell growth.

METHODS

The open reading frame of Collectrin was amplified by PCR and inserted into pcDNA3.1/V5-His plasmid. The recombinant plasmid was identified by restriction enzyme analysis and sequencing analysis. The recombinant plasmid was transfected into M-1 cell by using lipofectin mediation after being identified by restriction enzyme analysis and sequencing analysis. RT-PCR and Western blot were performed to identify the expression of Collectrin. Beta-Gal staining was used to define the effect of transfection. The growth of M-1 cells was examined by MTT and cell counting.

RESULTS

Compared with control group, the expression of Collectrin was decreased significantly at both nucleotide and protein levels transfected by antisense vector, but elevated in sense group. The cell growth was blocked after being transfected by antisense plasmid.

CONCLUSION

The sense and antisense eukaryotic expression vector of novel gene Collectrin was successfully constructed. Collectrin was one of basic factors in cell growth.

[Expression of heparanase in human non-small cell lung cancer]

BACKGROUND

To study the relationship between human heparanase expression and biological factors regarding invasion, metastasis and prognosis of human non-small cell lung cancer (NSCLC).

METHODS

The expression of heparanase was assessed in 122 paraffin-embedded specimens and 38 freshly-taken tissues by immunohistochemical staining and Western blot. The relationship between heparanase expression and the clinicopathological factors was analyzed by Chi square test, multivariate analysis and Kaplan-Meier method.

RESULTS

In the immunoreactive cells, staining was mainly located in cytoplasma and membrane. Human heparanase was highly expressed in lung cancer tissues (78.7%, 96/122) while negative in epithelia of normal lung tissues. The level of heparanase was remarkably higher in NSCLC than that in normal tissues ( P = 0.043 ). Expression of heparanase significantly correlated with TNM stage ( P =0.025), lymphatic metastasis ( P =0.002) and vascular invasion ( P =0.000 3). The patients with positive heparanase expression had a significantly shorter survival than those with negative heparanase expression ( P =0.000 6). In multivariate analysis, only p-TNM stage, lymphatic metastasis and vascular invasion could be considered as prognostic factors.

CONCLUSIONS

Heparanase might play an important role in the development, invasion and metastasis of NSCLC. It is indicated that patients with positive heparanase expression would have a greater chance of metastasis and a poorer prognosis. However, heparanase expression is not an independent prognostic factor.

Susceptibility of oral bacteria to an antimicrobial decapeptide

Naturally occurring antimicrobial peptides have emerged as alternative classes of antimicrobials. In general, these antimicrobial peptides exhibit selectivity for prokaryotes and minimize the problems of engendering microbial resistance. As an alternative method to search for more effective broad-spectrum peptide antimicrobials, investigators have developed peptide libraries by using synthetic combinatorial technology. A novel decapeptide, KKVVFKVKFK (KSL), has been identified that shows a broad range of antibacterial activity. The purpose of this study was to test the efficacy of this antimicrobial peptide in killing selected strains of oral pathogens and resident saliva bacteria collected from human subjects. Cytotoxic activity of KSL against mammalian cells and the structural features of this decapeptide were also investigated, the latter by using two-dimensional NMR in aqueous and DMSO solutions. MICs of KSL for the majority of oral bacteria tested in vitro ranged from 3 to 100 microg ml(-1). Minimal bactericidal concentrations of KSL were, in general, within one to two dilutions of the MICs. KSL exhibited an ED(99) (the dose at which 99 % killing was observed after 15 min at 37 degrees C) of 6.25 microg ml(-1) against selected strains of Lactobacillus salivarius, Streptococcus mutans, Streptococcus gordonii and Actinobacillus actinomycetemcomitans. In addition, KSL damaged bacterial cell membranes and caused 1.05 log units reduction of viability counts of saliva bacteria. In vitro toxicity studies showed that KSL, at concentrations up to 1 mg ml(-1), did not induce cell death or compromise the membrane integrity of human gingival fibroblasts. NMR studies suggest that KSL adopts an alpha-helical structure in DMSO solution, which mimics the polar aprotic membrane environment, whereas it remains unstructured in aqueous medium. This study shows that KSL may be a useful antimicrobial agent for inhibiting the growth of oral bacteria that are associated with caries development and early plaque formation.

[Screening for proteins interacting with novel gene AngRem104 in the adult human kidney cDNA library by yeast two hybrid system]

OBJECTIVE

To screen for proteins interacting with novel gene AngRem104.

METHODS

The yeast strain AH109 was transformed with AngRem104-pGBKT7/c-myc, and yeast-mating was utilized to screen for interacting proteins with AngRem104 in pretransformed human kidney cDNA library.

RESULTS

AngRem104 protein was expressed and there was no self-activation and toxicity in AH109. Seven proteins that interacted with AngRem104, including eukaryotic translation elongation factor 1 alpha 1, glucocorticoid receptor AF-1 specific elongation factor, beta 2-microglobulin, BBS2 and four of cell metabolism related proteins, were identified.

CONCLUSION

The novel gene AngRem104 may interact with the proteins, which may interfere with cell metabolism, disturb the balance between transcription factors, or may be involved in some immunity related and hereditary diseases. This investigation provides functional clues for further exploration of the novel gene, AngRem104.

Screening and identification of the up-regulated genes in human mesangial cells exposed to angiotensin II

Accumulation of extracellular matrix (ECM) in the glomerular mesangium is a common feature of many progressive renal diseases. Angiotensin II (Ang II) plays a major role in the progression of chronic kidney diseases in part by induction of ECM. However, the precise molecular signals responsible for this effect are unknown. To explore possible molecular mechanisms of ECM production related to Ang II, we screened and identified genes up-regulated by Ang II in cultured human mesangial cells (MC). Detection of up-regulated genes was determined by mRNA populations from human MC with and without Ang II stimulation (10(-6) mol/l, 24 h) by suppression subtractive hybridization. Reverse Northern blot analysis was performed to screen for differentially expressed genes. Full-length cDNAs of three novel genes were isolated by rapid amplification of cDNA ends (RACE)-polymerase chain reaction (PCR). One of these novel genes, AngRem104, was further investigated by Northern blot, Western blot and reverse transcription (RT)-PCR. The bioinformatics analysis implied that AngRem104 coded for a nuclear protein that was widely expressed in various normal human tissues. Moreover, up-regulation of AngRem104 induced by Ang II was time-dependent and was dose-dependently blocked by the Ang II type 1 receptor antagonist, Losartan. Interestingly, we also demonstrated that AngReam104 was associated with increased fibronectin expression. We conclude that AngRem104 is a novel human gene that is related to the expression of fibronectin and that is up-regulated by Ang II in human MC. These findings may lead to new insights into the mechanisms of glomerular sclerosis associated with Ang II.

[Analysis on the trace element and amino acid content in xinjiang 6 series Rhodiola L. plant]

Trace elements Na, K, Mg, Ca, Mn, Fe, Cu, Zn, Se and 20 kinds of amino acid in Xinjiang 6 series of Rhodiola's root and rootstalk were measured. The result shows that contents of 9 kinds of trace elements in them are different. They contain from 8 to 18 kinds amino acid, and also contain from 3 to 7 kinds of indispensable amino acid respectively. Rhodiola rosea L. contains most kinds of amino acid among six kinds of Rhodiola L. in Xingjiang, and contents of trace elements in it are also moderate, so it is fittest to be a nutrious chinese traditional and herbal drug of six kinds of Rhodiola L. in Xingjiang.

[Coarse woody debris and its function in forest ecosystem]

Coarse woody debris (CWD) is an important structural and functional element in forest ecosystem. In this paper, the definition, dynamics, and role of CWD in a forest ecosystem were overviewed. CWD include all woody debris above and under the ground with a diameters > or = 2.5 cm, and mainly comes from the dead trees resulted from competition and disturbances. The biomass of CWD changes like "U" form along with the development of a forest community. The decay rate of CWD is determined by the compound course of the respiration and natural fragmentation. Insects and microorganisms play an important role in the course. CWD basically has two functions in an ecosystem. One is as the nutrition pool for some living creatures, and the other is that the large CWD can form some special habitats for animals and plants. Conclusively these two functions are helpful to reserve the biodiversity and the integrity of ecological process in a natural ecosystem. Gaps are formed while dead trees falling down, and all gaps in a forest succeed one another randomly in the development of a forest ecosystem, which pushes the inner circulation of the forest. Because of the vital roles of CWD in a forest ecosystem, much more attention should be paid in the management of forest ecosystem.

Effects of Kampo medicine, Toki-shakuyaku-san (Tang-Kuei-Shao-Yao-San), on choline acetyltransferase activity and norepinephrine contents in brain regions, and mitogenic activity of splenic lymphocytes in ovariectomized mice

We investigated the effects of Toki-shakuyaku-san (TSS, Tang-Kuei-Shao-Yao-San in Chinese), Japanese traditional herbal medicine, on the nervous and immune systems in ovariectomized mice as a climacteric disorder model. Female C57BL/6 mice were ovariectomized (OVX) and TSS was given daily through the drinking water for either 10 or 20 days from the day after ovariectomy. After completion of experimental sessions, animals were sacrificed and specific brain regions were assayed for choline acetyltransferase (ChAT) activity and norepinephrine contents. The mitogenic activities, alkaline phosphatase activity and 3-(4, 5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H terazolium bromide (MTT) activity, in splenic lymphocytes has also measured. Furthermore, the effects of TSS on learning and memory ability were studied by the step-through type passive avoidance test. As the results, the administration of TSS significantly suppressed the decrease of ChAT activity in the cerebral cortex (CC) and the dorsal hippocampus (DH) of ovariectomized mice at 10 days after ovariectomy, however no significant effect was observed at 20 days after ovariectomy. Norepinephrine contents in OVX group were decreased at 10 and 20 days after ovariectomy in the CC and the ventral hippocampus (VH). The administration of TSS significantly suppressed the decrease of norepinephrine contents at 20 days after ovariectomy. The mitogenic activities of lymphocyte in spleen were increased at 10 days after ovariectomy, and decreased at 20 days after ovariectomy. However, the suppression of these changes was observed in the group given TSS. The mean latent period was also shortened in the passive avoidance test in the OVX group, but TSS treated group improved mean latency. From these observations, it is inferred that administration of TSS brings on the synthesis of acetylcholine and norepinephrine in the CC and hippocampus, and may improve the memory related behavior and the abnormalities in lymphocytes in the models of the climacteric disorder.

Impermeability of the GIRK2 weaver channel to divalent cations

A single amino acid mutation (G156S) in the putative pore-forming region of the G protein-sensitive, inwardly rectifying K(+) channel subunit, GIRK2, renders the conductance constitutively active and nonselective for monovalent cations. The mutant channel subunit (GIRK2wv) causes the pleiotropic weaver disease in mice, which is characterized by the selective vulnerability of cerebellar granule cells and Purkinje cells, as well as dopaminergic neurons in the mesencephalon, to cell death. It has been proposed that divalent cation permeability through constitutively active GIRK2wv channels contributes to a rise in internal calcium in the GIRK2wv-expressing neurons, eventually leading to cell death. We carried out comparative studies of recombinant GIRK2wv channels expressed in Xenopus oocytes and COS-7 cells to determine the magnitude and relative permeability of the GIRK2wv conductance to Ca(2+). Data from these studies demonstrate that the properties of the expressed current differ in the two systems and that when recombinant GIRK2wv is expressed in mammalian cells it is impermeable to Ca(2+).

[The genotype of vac A gene of Helicobacter pylori (Hp) and its correlation with the gastroduodenal diseases associated with Hp]

OBJECTIVE

To analyze the expression of vac A gene of Helicobacter pylori (Hp) isolated from Chinese patients and to find out the relationship between the genotype of Hp vac A and the gastroduodenal diseases associated with Hp.

METHODS

Clones of Hp obtained from patients with gastroduodenal diseases were cultured and mRNA extraction was performed with reverse transcriptase polymerase chain reaction (RT-PCR).

RESULTS

92% of the strains isolated in Shanghai (China) was found to be s1/m2. Strains expressing s1/m1 forms were obtained in 4 cases. s2 form was not found.

CONCLUSION

The overwhelming majority of strains isolated from Shanghai patients expresses s1/m2 from. The s1/m2 genotype is dispersed in all of the gastroduodenal diseases associated with Hp.

The inwardly rectifying K(+) channel subunit GIRK1 rescues the GIRK2 weaver phenotype

The weaver (wv) gene has been identified as a glycine to serine substitution at residue 156 in the H5 region of inwardly rectifying K(+) channel, GIRK2. The mutation is permissive for the expression of homotetrameric channels that are nonselective for cations and G-protein-independent. Coexpression of GIRK2wv with GIRK1, GIRK2, or GIRK3 in Xenopus oocytes along with expression of subunit combinations linked as dimers and tetramers was used to investigate the effects of the pore mutation on channel selectivity and gating as a function of relative subunit position and number within a heterotetrameric complex. GIRK1 formed functional, K(+) selective channels with GIRK2 and GIRK3. Coexpression of GIRK2wv with GIRK1 gave rise to a component of K(+)-selective, G-protein-dependent current. Currents resulting from coexpression of GIRK2wv with GIRK2 or GIRK3 were weaver-like. Current from dimers of GIRK1-GIRK2wv, GIRK2-GIRK2wv, and GIRK3-GIRK2wv was phenotypically similar to that obtained from coexpression of monomers. Linked tetramers containing GIRK1 and GIRK2wv in an alternating array gave rise to wild-type, K(+)-selective currents. When two mutant subunits were arranged adjacently in a tetramer, currents were weaver-like. These results support the hypothesis that in specific channel stoichiometries, GIRK1 rescues the weaver phenotype and suggests a basis for the selective neuronal vulnerability that is observed in the weaver mouse.

[Radiofrequency treatment of ethmoidal nerve with allergic rhinitis under nasal endoscopy]

OBJECTIVE

To study the effect of radiofrequency treatment of ethmoidal nerve on allergic rhinitis.

METHOD

Eighty-eight cases of allergic rhinitis were treated with ethmoidal nerve radiofrequency under nasal endoscopy.

RESULT

It showed marked effectiveness in 73 cases (83.0%), immprovement in 11 cases (12.5%) and failed in 4 cases (4.5%) in one year follow-up. The overall effective rate was 95.5%.

CONCLUSION

This result indicated that it is a choice for treating allergic rhinitis to apply ethmoidal nerve radiofrequency under nasal endoscopy.