[Chemical Constituents from Cynanchum paniculatum].

OBJECTIVE: To investigate the chemical constituents from Gynanchum paniculatum. METHODS: The constituents were isolated and purified by silica gel, Sephadex LH-20 column chromatography, and preparative TLC. Their structures were identified on the basis of spectral data and physiochemical characteristics. RESULTS: 15 compounds were isolated from 70% ethanol extract and identified as ß-sitosterol(1), ß-daucosterin (2), mudanoside A (3), paeonolide (4), santamarin (5), paeonol(6), annobraine (7), laricircsinol (8), α-asarone(9), 7-angelyheliotridine(10), ß-amyrin(11), uridine(12), kaempferol-3-O-ß-D-glucopyranosyl(1→2)α-L-arabinopyranoside(13), kaempferol-7-O-(4", 6"-di-p-hydroxycinnamoyl-2", 3"-diacetyl)-ß-D-glucopyranoside(14), and (2S, E)-N-[2-hydroxy-2-(4-hydroxyphenyl) ethyl] ferulamide (15). CONCLUSION: Compounds 4, 6, 8, 11, 12 and 15 are isolated from this plant for the first time, compounds 5 and 14 are firstly isolated from the palnts of Cynanchum genus.

Pre-existing mutations in reverse transcriptase of hepatitis B virus in treatment-naive Chinese patients with chronic hepatitis B.

High rate of viral replication and lacking of proofreading activity in hepatitis B virus (HBV) polymerase lead to the generation of mutations in HBV virus. Mutations in the reverse transcriptase (RT) region of HBV polymerase are demonstrated to be strongly associated with drug resistance during antiviral treatment. However, the presence of mutations as well as its clinical significance in treatment-naïve hepatitis patients (defined as pre-existing mutations) need to be further investigated. In the present study, a total of 168 serum samples from treatment-naive chronic hepatitis B (CHB) patients were collected, and the RT region of HBV polymerase was sequenced. The results showed that pre-existing mutations in the RT region of HBV polymerase were detected in 43 of 168 (25.6%) treatment-naive CHB patients within which there were no well-characterized primary nucleotide analogs (NAs) resistance sites. Three dominant sites at rt191, rt207 and rt226 were found mutant in 7(16.28%), 8(18.60%), and 14(32.56%) samples respectively among these 43 patients. No significant correlation was found between pre-existing mutations and gender, age, HBV genotype, ALT, HBeAg or HBV DNA loads. However, patients with pre-existing RT mutations under HBeAg sero-negative status exhibited decreased HBV DNA loads, which contributed to the decreased HBV DNA loads in the total HBeAg sero-negative patients. The above investigation indicated that there was a prevalence of pre-existing mutations in RT region of HBV polymerase which might affect the serum HBV DNA level in treatment-naive CHB patients. Its effects on the occurrence of NAs resistance and the prognosis after treatment need to be further investigated.

[Comparison of transurethral detaching resection and plasmakinetic transurethral resection of the prostate for benign prostatic hyperplasia].

OBJECTIVE: To compare the clinical effects of transurethral detaching resection (TUDRP) and plasmakinetic transurethral resection of the prostate (PKRP) for benign prostatic hyperplasia (BPH). METHODS: We collected by the single blind method the clinical data of 81 cases of BPH treated by PKRP (n=41) and TUDRP (n=40), and compared the two groups of patients in their age, preoperative prostate volume, weight of the resected gland, operation time, intraoperative bleeding, time of postoperative Foley's catheter retention, and pre- and post-operative IPSS. RESULTS: The post-operative IPSS was significantly higher in the PKRP than in the TUDRP group (9.95 +/- 1.54 vs. 8.70 +/- 1.13, t = 0.0029, P = 0.0059). CONCLUSION: TUDPR has a better clinical effect than PKRP in the treatment of BPH.