[Effects of SUMO specific protease 1 on hPXR-mediated P-gp gene expression].

The study aimed to investigate the effects of small ubiquitin-related modifier (SUMO) specific protease 1 (SENP1) on human PXR-mediated MDR1 transcriptional activity and mRNA expression. Empty vector and expression plasmids, including PXR, SENP1 and SENP1 mutant (SENP1m) were transiently transfected into HepG2 and LS174T cells using Lipo2000. Transcriptional activity was detected by dual luciferase reporter gene assay, and mRNA level was measured using real-time polymerase chain reaction. The results showed that SENP1 could remarkably reduce the rifampicin (RIF)-induced MDR1 reporter activity and mRNA level in hPXR over expressed HepG2 and LS174T cells (P < 0.05), whereas adding SENP1m restored the RIF-induced increases (P < 0.05). These results indicated that SENP1 could repress the RIF-induced hPXR-mediated MDR1 transcriptional activity and mRNA expression.

[Optimization of conditions for human erythropoiesis in human-mouse xenotransplant model].

This study was purposed to investigate the conditions for improving human-mouse xenograft and the erythroid differentiation of human hematopoietic stem cells (HSC) in the xenotransplant model. The engraftments of different mouse strains (NOD/SCID or NOD/SCID/IL2rγ(null)), schemes of irradiation (single-time or 2-times radiation; Co(60)γ-ray or X-ray) and strategies of CB CD34(+) cells ex vivo culture time and lentivirus infection were compared. The results showed that at 4 weeks after transplantation, the ratio of hCD45 positive cells in bone marrow of NOD/SCID/IL2rγ(null) mice increased to (51.4 ± 13.9)%, and erythroid precursor could be detected. All of the mice receiving X-ray irradiation for 2 times (a dose of 1 Gy, then the second of 1.5 Gy, with an interval of 15 min) survived. Fresh isolated CB CD34(+) cells were cultured and infected with lentivirus for 72 h and then transplanted into receptor mouse. After 4 weeks, higher engraftment [hCD45 (51.4 ± 13.9)%] and better erythroid development [hCD71(+) GPA(+) (5.98 ± 3.46)%] were observed. It is concluded that NOD/SCID/IL2rγ(null) mice receiving X-ray irradiation for 2 times and were injected with fresh isolated CB CD34(+) cells cultured and infected with lentivirus ex vivo within 72 h show a better xenograft and erythroid development.

Effect of Yangyin Humo Decoction on oral mucomembranous reaction to radiotherapy.

OBJECTIVE: To observe the effect of Yangyin Humo Decoction (YHD) on oral mucomembranous reaction in patients with head-neck tumor undergoing radiotherapy. METHODS: Forty-Forty-two patients with head-neck tumor undergoing radiotherapy were randomized equally into two groups. The two conventional Western medical treatment was administered to all, including intravenous dripping of 2% lidocaine 20 mL, dexamethasone 5 mg, gentamycin 80,000 units, vitamin B(12) 5 mg, dissolved in saline 250 mL, and 5% sodium bicarbonate solution for gargling, but to the patients in the tested group, YHD was given additionally. The medication was started simultaneously all through the whole course of the radiotherapy. Patients were examined every day to observe and compare the degree, initiating time, and repairing time of their oral lesions; the dosage of radiation they received was recorded as well. RESULTS: The degree of mucomembranous reaction that appeared in most patients in the test group was of grade 1-2, while in the control group, it was grade 2-3. The average time for oral lesion of 1, 2, 3 grades to be initiated in the test group was 12.0+/-1.1, 11.0+/-1.3 and 10.0+/-0.8 days, respectively, after radiation started, which was later than that in the control group (P<0.01). Moreover, the average repairing time for the lesions of grades 1, 2, and 3 in the test group was 3.0+/-0.7, 10.0+/-1.3 and 19.0+/-0.8 days, which were shorter than those in the control group respectively (P<0.01). The radiation applied on the primary tumor of patients with oral lesion of grade 1-3 in the test group was 24.2+/-2.2, 42.0+/-2.6 and 58.0+/-1.6 Gy on the average, respectively, which were higher than that applied on patients in the control group (P<0.05 or P<0.01). CONCLUSION: The Chinese herbal preparation YHD could alleviate oral mucomembranous reaction to radiation applied in patients with head-neck tumor.