Objective To investigate the mRNA expressions of IFN-gamma receptor and TNF-alpha receptor in peripheral blood mononuclear cells (PBMCs) of patients with psoriasis vulgaris and their role in the pathogenesis of psoriasis. Methods Fifty patients with psoriasis vulgaris (37 cases of active psoriasis and 13 cases of stable psoriasis) and 24 healthy human controls were included in this study. PBMCs were isolated from blood samples obtained from all patients and controls. The mRNA expressions of IFN-gamma receptor and TNF-aipha receptor in PBMCs were detected by RT-PCR. The disease severity in patients was evaluated by psoriasis area and severity index (PASI). Results The mRNA expressions of IFN-gamma receptor and TNF-alpha receptor were observed in the PBMCs of all subjects. The mRNA expression levels of IFN-gamma receptor were 0.72 ± 0.17 in healthy controls, 1.11 ± 0.55 in all patients with psoriasis, 1.13 ±0.57 in patients with active psoriasis and 1.03 ± 0.52 in patients with stable psoriasis, respectively. A signifi-cant increase was observed in the expression levels of IFN-gamma receptor mRNA in all psoriatic patients and in patients with active psoriasis compared with those in healthy controls (both P < 0.05), but there was no significant difference between the healthy controls and patients with stable psoriasis (P ＞ 0.05). The expres-sion levels of TNF-alpha receptor mRNA were 2.05 ± 1.34 in healthy controls, 2.70 ± 3.80 in all psoriatic patients, 2.90 ± 4.40 in patients with active psoriasis, 2.14 ± 1.05 in patients with stable psoriasis, respectively;there was no significant difference between psoriatic patients and healthy controls (P ＞ 0.05). However, no correlation was found between the mRNA expression of IFN-gamma receptor, that of TNF-alpha receptor,and disease severity in psoriatic patients. Conclusions The mRNA expression of IFN-gamma receptor in PBMCs is up-regulated in patients with psoriasis vulgaris, which is unrelated to the activity of psoriasis.

Objective To investigate the role of AP-1 in the pathogenesis of chronic idiopathic urticaria (CIU). Methods By using immunomagnetic separation technology, peripheral blood basophils were isolated from 10 CIU patients and 10 normal human controls followed by the extraction of nuclear protein from the basophils. TransAMTM AP-1 family kit was used to detect the DNA binding activity changes of AP-1 family transcription factors in basophils, and Western blotting to detect the expression of P-c-jun protein. Results There were some differences in the DNA binding activity of AP-1 family transcription factors in basophils between CIU patients and normal controls. The DNA binding activity of Phospho-c-jun, c-fos, Fos-B, Jun-B and Jun-D factors was increased in CIU patients compared with the controls, and the increase in that of P-c-jun and Jun-D was statistically significant (both P < 0.05). There was an insignificant decrease in the DNA binding activity of Fra-1 factor in the CIU patients compared with the controls (P > 0.05). The P-c-jun (Ser73) protein expression was higher in CIU patients than that in the controls (0.527 ± 0.312 vs. 0.435 ± 0.042, P < 0.05),whereas there was no significant difference in the P-c-jun (Ser63) protein expression level. Conclusion Some changes in DNA binding activity of AP-1 and overexpression of P-c-jun (Ser73) protein in basophils may be involved in the pathogenesis of CIU.

Objective To compare three methods for the extraction of mycobacterial DNA.Methods Two commercial DNA extraction kits and an ordinary freeze-thawing method were used to extract DNA from the pure suspensions of three species of Mycobacteria (M.tuberculosis,M.leprae and M.smegmatis) at different densities (1 × 10 to 1 × 105 cells/ml),simulated clinical specimens containing different concentrations of mycobacterial cells (1 × 10 to 1 × 104 cells/ml).The purity and concentration of the extracted DNA were evaluated.Then,PCR was performed to amplify the 16S rRNA region of Mycobacteria.The performance of the three methods was compared by the purity and concentration of extracted DNA as well as the results of PCR.Further more,76 clinical skin specimens suspected to be infected with Mycobacteria were used to further validate the performance of these methods.Results All the extracted DNA samples could be detected by PCR.The highest purity of DNA was obtained by the kit A,followed sequentially by the freeze-thawing method and the kit B.When pure suspensions were used,the detection limit was consistently 1 × 102 cells/ml for all the three methods.With simulated specimens,the detection rate was consistently 100％ for all the three methods at the concentration of 1 × 103 cells/ml,60％ (12/20),55％ (11/20) and 55％ (11/20) for the kit A,kit B and freeze-thawing method respectively at the concentration of 1 × 102 cells/ml.The analysis of clinical specimens showed that the kit B could be used to extract DNA from paraffin-embedded specimens,with the detection rate similar to that of kit A and freeze-thawing method.Conclusions The kit A could rapidly yield high-quality genomic DNA of Mycobacteria by repeated cleaning of columns,and may serve as the optimal method for scientific and clinical studies,and the kit B is suitable for extracting mycobacterial DNA from fresh tissue specimens besides paraffin-embedded specimens.

Objective To develop a rapid method with high sensitivity and specificity to detect 4 mycobacterial species(M. tuberculosis, M. avium, M. intracellulare and M. kansasii) which are the most common opportunistic Mycobacteria in AIDS patients. Methods The sensitivities and specificities of PCR were determined with different primer pairs targeting various mycobacterial genes. Multiplex PCR with combination of 4 primer pairs was used to detect the template mixtures of either 1, 2 or 3 mycobacterial DNA. Sensitivities of multiplex PCR were measured. Results Specific DNA fragments of 4 mycobacterial species mentioned above could be detected by PCR and sensitivities ranged from 1 ? 101 ~ 1 ? 102 cells/mL, while the other 17 mycobacterial strains were all PCR-negative. Multiplex PCR could amplify the corresponding 1, 2 or 3 DNA fragments, depending on the number of template DNA added, and sensitivities of multiplex PCR ranged from 1 ? 102 ~ 1 ? 103 cells/mL. Conclusions Multiplex PCR is a rapid, sensitive and specific method for differentiation and detection of Mycobacteria.

Objective To develop a PCR-RFLP method for the identification of eight mycobacterial species. Methods PCR was performed targeting the gene encoding 65-kDa heat shock protein which was common to all mycobacteria. Two restriction enzymes, BstE Ⅱ and Hae Ⅲ, were used to digest the PCR products, and specific restriction patterns of different mycobacteria were obtained. Results The specific restriction patterns of different mycobacteria were identical to the data previously reported. Conclusion We could differentiate M. avium, M. intracellulare, M. kansasii, M. tuberculosis, M. scrofulaceum, M. marinum, M. fortuitum and M. chelonae in one experiment by PCR-RFLP.

Objective To study the corelation of mucosal involvement and corticosteroid dosage in the control of bullous pemphigoid(BP). Methods One hundred and three in-patients with bullous pemphigoid hospitalized during 1988 - 2002 were retrospectively analyzed for their mean corticosteroid dosage for controlling the disease and the duration for complete relieving the skin lesions, as well as the duration to start corticosteroid tapering. All the patients were divided into two groups: group A (37 cases) with mucosal involvement and group B (66 cases) without mucosal involvement. Results The mean corticosteroid dosage used to control the disease in group A was much higher than that in group B (t = 3.488, P 0.05). Conclusion Patients with mucosal involvement require a higher dosage of corticosteroids to control the disease.

Objective To assess the efficacy and safety of various spectrum lasers in the treatment of acne vulgaris. Methods Based on the principles and methods of Cochrane systematic reviews, we searched the Cochrane Library (2009, 6 issues), PubMcd, Embase, China Biomedical Literature Database, China Journal Full Text Database, Chinese Scientific Journals Full Text Database. Retrieval time was up to June, 2009. Randomized controlled trials (RCTs) of lasers for acne vulgaris were included. Results Twelve RCTs totaling 367 patients were included. Because the lack of clinical homogeneity, only descriptive analysis was conducted. Acne lesion counts improved significantly with laser therapy. Adverse effects were limited to transient erythema and edema at treatment sites. Treatment-related pains were well tolerated. Conclusions Current evidence demonstrates that all type lasers in treating acne vulgaris is safe and efficacy. However, higher quality RCT research would be needed to verify the effects and status of lasers on acne vulgaris.

ObjectiveTo investigate the correlation between the methylation status of HLA class Ⅰ genes(HLA-A, -B and -C) in psoriatic epidermis and disease severity in patients with psoriasis vulgaris. MethodsDNA specimens were obtained from the lesional and nonlesional epidermis of 46 patients with psoriasis vulgaris and from the normal skin of 28 human controls. Methylation specific PCR (MSP) was conducted to detect the methylation status of CpG islands in the promoter region of HLA-A, -B and -C genes. The severity of psoriasis was evaluated by psoriasis area and severity index(PASI) scores. ResultsThe percentage of promoter methylation of HLA-B and HLA-C genes was 4.35％(2/46) and 21.74％(10/46), respectively in nonlesional epidermis, 4.35％ (2/46) and 4.35％ (2/46), respectively in lesional epidermis from these patients. No methylation was observed for the promoter of HLA-A, -B or -C gene in the normal control epidermis or for that of HLA-A gene in the nonlesional or lesional epidermis from the patients. The frequency of HLA-C gene promoter methylation in the nonlesional epidermis was significantly higher than that in the lesional epidermis and control epidermis, but was uncorrelated to the disease severity. No significant difference was observed for the methylation frequency of HLA-A or -B gene promoter among the three groups of specimens. Conclusion Abnormal methylation of HLA-C gene promoter is observed in patients with psoriasis vulgaris.

Objective To assess the association between the amino acid polymorphism (Arg64Gln)within the interferon-γ receptor 2 gene (IFN-γR2) and psoriasis vulgaris in Chinese Hans. Methods Blood samples were collected from 182 patients with psoriasis vulgaris and 114 healthy human controls in Jiangsu and Anhui provinces. The amino acid polymorphism (Arg64Gin) within the IFN- γR2 was examined by PCR-restriction fragment length polymorphism (RFLP) and DNA sequencing. Results No significant difference was observed in the amino acid polymorphism (Arg64GIn) within the IFN-γR2 between the psoriatic patients and healthy controls (P > 0.05 ). There was a significant difference between patients with nail involvement and those without in the frequency of Gln64/Gln64 genotype (57.5% vs 38.1%, X~2= 5.33, P < 0.05),andArg64 (Gln64)allele [19.3% (80.7%)vs30% (70%), X~2=5.03, P < 0.05]. The frequencies of Gln64/Arg64 genotype and Gln64/Gln64 genotype in psoriatic patients with nail involvement significantly differed from those in the controls (29.8% vs 49.1%,X~2 = 5.48, P < 0.05; 57.5% vs 35.1%, X~2= 6.23, P <0.05 ), while no significant difference was found between the psoriatic patients without nail involvement and controls. Moreover, significant difference was noted between patients with prior upper respiratory tract infection (as inducements) and those without in the frequency of Arg64/Arg64 genotype (33.3% vs 15.5%, X~2 =4.94, P < 0.05) and Gln64 (Arg64) allele [51.9% (48.1%) vs 35.2% (64.8%), X~2= 5.46, P < 0.05]. Condusion The amino acid polymorphism (Arg64Gln) within the IFN-γR2 may be associated with the nail involvement and upper respiratory tract infection in patients with psoriasis vulgaris.

Objective To compare the performance of 2％ (w/v) agarose gel,2％ (w/v) Metaphor agarose gel and 10％(w/v) nondenaturating polyacrylamide gel in the PCR-restriction fragment length polymorphism (RFLP) analysis of mycobacterial heat shock protein 65 (hsp65) gene.Methods This study included 8 Mycobacteria strains,including clinical isolates and standard strains of Mycobacteria tuberculosis and Mycobacterium intracellulare.Bacterialsuspension of these strains was prepared with the concentration of bacterial cells varying from 10 to 106per milliliter.PCR was performed to amplify the hsp65 gene with a pair of universal primers followed by the digestion of amplicons with two restriction endonucleases,BstE Ⅱ and Hae Ⅲ.Then,the restriction enzyme-digested fragments were subjected to electrophoresis in 2％ agarose gel,2％ Metaphor agarose gel and 10％ nondenaturating polyacrylamide gel respectively.Results As analysis of variance showed,the three gel electrophoresis methods were statistically different in sensitivity for the RFLP analysis of mycobacterial hsp65 gene (F =36.379,P ＜ 0.01).Least significance difference (LSD) procedure revealed that the 2％ agarose gel-based electrophoresis was less sensitive than the 2％ Metaphor agarose gel-and 10％ non-denaturing polyacrylamide gel-based electrophoresis (both P ＜ 0.01),and no significant differences were observed between the 2％ Metaphor agarose gel-and 10％ non-denaturing polyacrylamide gel-based electrophoresis (P ＞ 0.05).Conclusion The 2％ Metaphor agarose gel-and 10％nondenaturating polyacrylamide gel-based electrophoresis methods appear to be more sensitive than the 2％ agarose gel-based electrophoresis method for the PCR-RFLP analysis of mycobacterial hsp65 gene.