Effects of pulsed ultrasound and pulsed electromagnetic field on the extracellular matrix secretion of rat bone marrow mesenchymal stem cell pellets in chondrogenesis / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To study the effects of pulsed ultrasound (PUS) and pulsed electromagnetic fields (PEMF) on the secretion of extracellular matrix from a culture complex during in vitro chondrogenesis.</p><p><b>METHODS</b>All the rat bone marrow mesen- chymal stem cell pellets were cultured in achondrogenic medium. Different intensities of PUS (100, 150, and 200 mW · cm⁻²) and PEMF (1, 2, and 5 mT) were applied to the cell pellets for 2 weeks. Group N was cultured without PUS and PEMF stimu- lation as control. The culture medium was collected after 2 weeks of culture. Enzyme-linked immunosorbent assay (ELISA) was used to detect the type of collagen and glycosaminoglycan (GAG) in the culture medium.</p><p><b>RESULTS</b>PUS increased the secreting-type collagen and GAG from cell pellets compared with group N (P < 0.05), whereas there was no difference in different intensities (P > 0.05). PEMF had no significant effect on the secretion of the type of collagen (P > 0.05). A PEMF of 1 mT had no significant effect on the secretion of GAG (P > 0.05). A PEMF 2 and 5 mT decreased the secretion of GAG (P < 0.05).</p><p><b>CONCLUSION</b>To prevent the secretary of extracellular matrix may play a role in chondrogenic effect of PEMF.</p>

Genetic variation in SDC2 is associated with the risk of radiation esophagitis in patients with esophageal squamous cell carcinoma receiving radiotherapy / 中华肿瘤杂志

<p><b>OBJECTIVE</b>To explore the associations between the genetic variations in the SDC2 gene and overall survival and risk of radiation esophagitis in patients with esophageal squamous cell carcinoma (ESCC).</p><p><b>METHODS</b>Eleven functional haplotype-tagging single nucleotide polymorphisms (htSNPs) of SDC2 were genotyped in 296 ESCC patients who received radiotherapy alone, and had different response and esophagitis. The associations between genotypes and risk of esophagitis were measured by odds ratios (ORs) and 95% confidence intervals (CIs), adjusted for sex, age, tumor location, staging, radiotherapy mode and total radiation dose. The hazard ratios (HRs) were estimated using Cox proportional hazards regression model.</p><p><b>RESULTS</b>The median survival time (MST) of these patients was 14 months. Of them, 260 (87.8%) had died until the last date of follow-up of 30 June, 2014. Clinical stage (stage IV vs. stage II) and total radiation dose (≥ 60 Gy vs. < 60 Gy) influence the overall survival time of the patient significantly. Cox proportional hazards regression model analysis showed that the subjects with rs61599409 T allele had an decreased hazard ratio as compared with those with C allele (adjusted HR = 0.82, 95% CI, 0.66-1.02), but the difference was not statistically significant (P = 0.071). The rest 10 htSNPs were not associated with the overall survival of ESCC patients treated with radiotherapy. Among this set of patients, 160 (54.1%) suffered from radiation esophagitis. We found that rs17788084 A > T SNP in the 3'-untranslational region of SDC2 was associated with esophagitis risk, with the OR being 0.48 (95% CI = 0.28-0.85, P = 0.011) for the TA or TT genotype compared with the AA genotype.</p><p><b>CONCLUSIONS</b>These results suggest that rs17788084 genetic variation in SDC2 is associated with risk of radiation esophagitis and might serve as a potential biomarker for personalized radiotherapy of ESCC.</p>

Research progress of antiemetics in tumor therapy / 肿瘤研究与临床

Chemotherapy plays a significant role in cancer therapy,but chemotherapy-induced nausea and vomiting(CINV)common happened and affects patients satisfaction with treatment.With the development ot physiology on emesis,the new antiemetics such as 5-HT3 receptor antagonist(5-HT3RA),Aprepitant and Olanzapine greatly improved the control of CINV,the guidelines for antiemeties were deftned.Research progress of antiemetics was summarized.

Risk Factors of HBV Intrauterine Transmission / 中山大学学报(医学科学版)

【Objective】 To study the risk factors of Hepatitis B Virus intrauterine transmission. 【Method】 Cordal blood from 87 HBV carrier's newborns was tested for HBV markers and PCR-HBV-DNA. Maternal venous blood po stpartum was tested for HBV markers. 【Results】 HBV-DNA positive rate of corda l blood is 1.2%(1/86). Odds Ratio(OR) of positive maternal HBsAb, HBeAg, HBeAb and HBcAb for intrauterine infection are 0.697(0.586～0.786), 50.792(13.082 ～197.204), 0.103(0.032～0.338) and 2.261(0.587～8.712), respectively. Co rdal HBsAg positive rate of maternal HBeAg positive group was significantly high er than that of only HBsAg positive group (31.0% vs 3.92%), so was cordal HBeA g positive rate (72.4% vs 3.92%). Maternal HBeAg was significantly correla ted with cordal HBsAg, especially HBeAg. Newborn sex wasn′t correlated with intraut erine infection. 【Conclusion】 Positive maternal HBeAg was one risk factor of i ntrauterine HBV infection. Newborn sex wasn′t correlated with intrauterine infe ction.