Objective To measure the expression of peroxisome proliferator-activated receptor β/δ (PPARβ/δ) in epidermal keratinocytes from patients with psoriasis,and to investigate its regulatory factors.Methods Tissue specimens were obtained from both lesional and non-lesional skin of 20 patients with psoriasis as well as from normal skin of 15 human controls.An immunohistochemical method was used to examine the expression of PPARβ/δ in these tissue specimens.Epidermal keratinocytes were isolated from these tissue specimens and subjected to a primary culture.After several passages of subculture,non-lesional psoriatic keratinocytes were stimulated with different concentrations of GW501516 (an agonist of PPARβ/δ,0-100 ng/ml) and Ca2+ (0-3.0 mmol/L).Reverse transcription-PCR and Western blot were performed to measure the mRNA and protein expressions of PPARβ/δ in the primary keratinocytes and stimulated keratinocytes respectively.Results Immunohistochemistry showed that the expression intensity of PPARβ/δ was significantly higher in lesional psoriatic skin than in normal control skin (t =19.28,P ＜ 0.01) and non-lesional psoriatic skin (t =23.26,P ＜ 0.01).Increased mRNA and protein levels of PPARβ/δ were observed in lesional psoriatic keratinocytes as compared to normal control keratinocytes (both P ＜0.01) and non-lesional psoriatic keratinocytes (both P ＜ 0.01).Among these stimulated non-lesional psoriatic keratinocytes,those treated with GW501516 at 10 ng/ml and those with Ca2+ of 1.0 mmol/L showed the strongest expression of PPARβ/δ (both P ＜ 0.01).Conclusions The expression of PPARβ/δ,which is higher in lesional psoriatic skin,can be enhanced by GW501516 and Ca2+ in keratinocytes.

Objective To understand the virology test characteristics of hepatitis B virus (HBV) for discuss the relation of HBV genotype and HBeAg, anti-HBc-IgM, HBV DNA and disease progression. Methods Two hundred cases of hepatitis B were detected by the ELJSA assay with two pairs of semi-markers (HBsAg, anti-HBs, HBeAg, anti-HBe, anti-HBc) and anti-HBc-IgM, using fluorescence quantitative polymerase chain reaction (FQ-PCR) for detecting HBV DNA, using monoclonal antibody ELISA method (mAbs ELISA) for HBV genotyping and analysis of test results. Results In 200 patients with hepatitis B, the HBV genotype detected in 179 cases (89.5%), B-type 121 cases(60.5%), C-type 58 cases (29.0% ). There had no relationship with HBeAg, anti-HBc-IgM, HBV DNA and genotype. B-type HBV prevalent in asymptomatic carriers (ASC) and chronic hepatitis B (mild);C-type common in patients with liver cirrhosis (LC) and chronic hepatitis B (severe). Conclusions HBV genotype in Shenzhen mainly is B-type, C-type second;mAbs ELISA assay with HBV genotype is specific, sensitive, simple and practical features, HBV replication strength has nothing to do with the virus genotype. HBV genotype and HBeAg, anti-HBc-IgM, HBV DNA testing may complement each other, with the clinical application value.