Objective To investigate the effect of calcipotriol on melanin synthesis by human melanocytes and its possible action mechanism.Methods Primary melanocytes were cultured with various concentrations(10~(-5),10~(-6),10~(-7),10~(-8),10~(-9),10~(-10) mol/L)of calcipotriol for 24 or 48 hours.Subsequently,MTT assay,NaoH assay.Dopa-oxidase assay,Western blot and semiquantitative RT-PCR were used to measure the cell proliferation of,melanin synthesis by.tyrosinase activity,protein and mRNA expression levels in the melanocytes.respectively.Those untreated melanocytes served as the control.Results The calcipotriol between 10~(-9) and 10~(-5) mol/L had no significant effect on the proliferation of cultured melanocytes(P＞0.05).while that of 10~(-9) and 10~(-8) mol/L increased tyrosinase activity by 137%and 123%,and enhanced melanin synthesis by 40.63%and 18.75%,respectively,compamd with untreated melanocytes(both P＜0.05).Moreover,the tyrosinase protein level increased by 270.4%(P＜0.05)in melanocytes treated with calcipotriol at 10~(-9) mol/L for 24 hours.The strongest tyrosinase activity and melanin synthesis was observed in melanocytes treated with calcipotriol of 10~(-9) moI/L.Conclusions The proliferation of melanocytes is unaffected by calcipotriol at 10~(-9) to 10~(-5) mol/L,but it can elevate the expression of tyrosinase protein,enhance tyrosinase activity,and promote melanin synthesis in melanocytes.

Objective To investigate the association of HLA class Ⅱ genes and vitiligo in the eastern China Han nationality. Methods Ninety-eight patients with vitiligo and 150 healthy controls were studied for HLA-DRB1, DQA1 and DQB1 locus alleles by PCR-SSOP typing. Results The frequency of HLA-DQA1*03 increased significantly (Pc = 0.008) and DQA1*05 decreased significantly (Pc = 0.016) in the patients with vitiligo. Conclusions The results suggest that there exists a correlation between HLA class Ⅱ genes and vitiligo, and DQA1*03 allele may be a susceptible gene or have a close linkage with susceptible genes, while DQA1*05 allele may be a protective gene in the eastern China Han nationality.

Objective To test the technical param eters of GlobalFiler?PC R A m plification K it for its ap-plication to forensic application value and to investigate the genetic polym orphism s. Methods The valida-tion w as conducted in sensitivity, m ixed sam ples, species specificity, adaptability, survivability, consistency, peak height balance and stability. The am plification and detection of the genom ic D N A from 373 unre-lated individuals from B eijing H an nationality w ere extracted by autom ation w orkstation. Results Global-Filer?PC R A m plification K it w as adaptive to som e m ixed, degraded and inhibited sam ples. The pow er of sensitivity and adaptability and peak height balance show ed w ell. The distributions of genotype fre-quencies for 21 STR loci in the population w ere all in accordance w ith H ardy-W einberg equilibrium (P>0.05). The PIC value of the 21 STR loci w as am ong 0.536 to 0.940; the H value w as am ong 0.558 to 0.933; the D P value w as am ong 0.783 to 0.992; the PE value w as am ong 0.243 to 0.874. Conclusion GlobalFiler?PC R A m plification K it is suitable for crim inal cases and D N A database in forensic practice. A nd 21 STR loci in B eijing H an nationality have high polym orphism , w hich have ap-plication value in forensic practice and population genetics.

Objective To investigate the effect of CT perfusion (CTP) imaging guidance in the treatment of acute cere?bral infarction. Methods Patients (n=200) with acute cerebral infarction who visited our clinic within 6 hours underwent CTP examination and were divided into two groups:penumbra group and non-penumbra group according to their CTP imag?ing (presence of penumbra or not). Recombinant tissue plasminogen activator (rt- PA) was administrated for intravenous thrombolysis in both groups. NIHSS (The NIH Stroke Scale), BI (Barthel Index), mRS (modified Rankin Scores) and hemor?rhagic transformation events of two groups were determined before and after thrombolysis to evaluate its effect and prognosis in these two group. Results Compared with non penumbra group, NIHSS was reduced in penumbra group from 7 days after rt-PA (6.67±3.46 vs 4.76±2.04), and this decrease became obvious at 4 weeks after rt-PA (6.67±3.46 vs 3.68±1.93). Effi?ciency rate at 4 week (60.3%) and good prognosis rate at 3 months(71.7%)were both significantly improved in penumbra group than those in non penumbra group(34.7%,56.8%). Conclusion rt-PA under CTP guidance is effective and safe in the treatment of acute cerebral infarction. The thrombolytic therapy window can be enlarged according to the presence of pen?umbra or not and the bleeding conversion rate remains at low level.

Objectives To conduct a research on the possibility and effect factors of latent fingerprints development in clothing objects after vacuum coating, and extracting fingerprints DNA and to probe in the relation among DNA template quantity and genetic loci numbers tested, and the rfu value after coating. Methods To select two groups that are free sweat hands and sweat hands and have them press their fingerprints on the cloth, after coating, and to analyze the effect of time, to quantify and test the targeted fingerprints DNA, to compare the locus numbers tested between white and black cloth. Results As the time is prolonged, the locus numbers tested decrease. The locus numbers tested on the group of sweat hands using the same method after the same placed time are lager than the free sweat hands. When the value of rfu is 600 above, the ratio of the locus numbers tested is more than 90% and the threshold of templates is 0.013ng. The locus numbers tested of white cloth is larger, comparing with black cloth when using the same method. What is more, there exists an prohibitive influence of pigments of the dyed cloth over the PCR amplification, to put it further, the loci numbers tested will be trimmed. Conclusion The technology of vacuum coating can be well used in the area of detecting fingerprint DNA.