Natural products in traditional Chinese medicine: molecular mechanisms and therapeutic targets of renal fibrosis and state-of-the-art drug delivery systems

Renal fibrosis (RF) is the end stage of several chronic kidney diseases. Its series of changes include excessive accumulation of extracellular matrix, epithelial-mesenchymal transition (EMT) of renal tubular cells, fibroblast activation, immune cell infiltration, and renal cell apoptosis. RF can eventually lead to renal dysfunction or even renal failure. A large body of evidence suggests that natural products in traditional Chinese medicine (TCM) have great potential for treating RF. In this article, we first describe the recent advances in RF treatment by several natural products and clarify their mechanisms of action. They can ameliorate the RF disease phenotype, which includes apoptosis, endoplasmic reticulum stress, and EMT, by affecting relevant signaling pathways and molecular targets, thereby delaying or reversing fibrosis. We also present the roles of nanodrug delivery systems, which have been explored to address the drawback of low oral bioavailability of natural products. This may provide new ideas for using natural products for RF treatment. Finally, we provide new insights into the clinical prospects of herbal natural products.

Improving Spanish translations of tobacco dependence measures using cognitive interviewing

BACKGROUND

Cognitive interviewing is the practice of systematically collecting feedback about survey items from members of the priority population, with the goal of identifying and rectifying problems to increase the comprehensibility of the survey. Evidence is limited on the extent to which this method of pretesting improves survey items.

OBJECTIVE

The current study examined the utility of incorporating cognitive interviewing to improve the Spanish translations of two measures of tobacco dependence.

METHODS

Items from the Spanish versions of the Wisconsin Inventory of Smoking Dependence Motives (68 items) and Nicotine Dependence Syndrome Scale (19 items) were subjected to cognitive interviews with Spanish-speaking smokers. Problematic items were revised based on participant feedback and re-assessed in a second round of interviews (N = 23, 78.3% male; 21.7% female).

RESULTS

Twenty-three of the 87 items demonstrated comprehension problems, and 67 items elicited at least one problem report. Number of problems were significantly fewer pre- vs. post-revision (t [90] = 6.55, p < .001).

CONCLUSIONS

In combination with standard translation procedures, cognitive interviewing with the priority population appears to be a useful method for ensuring comprehensible and relevant item content.

Genetic Association of CHRNB3 and CHRNA6 Gene Polymorphisms with Nicotine Dependence Syndrome Scale in Korean Population

OBJECTIVE

Cholinergic nicotinic receptor (CHRN) gene family has been known to mediate the highly additive effects of nicotine in the body, and implicated nicotine dependence (ND) and related phenotypes. Previous studies have found that CHRNA6-CHRNB3 cluster polymorphisms were significantly associated with the risk of ND and various tobacco behaviors. The aim of study was to evaluate the genetic association of CHRNB3 and CHRNA6 polymorphisms with the risk of ND based on the Fagerstrom Test for Nicotine Dependence (FTND) score and five subscales of nicotine dependence syndrome scale (NDSS) in Korean population.

METHODS

Six SNPs in CHRNA6-CHRNB3 cluster were analyzed in 576 Korean subjects. Association analysis using logistic models and regression analysis with NDSS were performed.

RESULTS

There was no association in the case-control analysis, whereas all six SNPs were significantly associated with drive factor among NDSS in subgroup based on the FTND score. CHRNB3 rs4954 and CHRNA6 rs16891604 showed significant associations with NDSSF1 (drive) in dominant models among moderate to severe ND among smokers after correction (p(corr) =0.02 and 0.001, respectively), whereas other four SNPs showed significant associations among mild ND after correction (p(corr) =0.03-0.02 in dominant model).

CONCLUSION

This study showed that the genetic influence of CHRNB3-CHRNA6 cluster polymorphisms are found in a ND endophenotype (drive) using NDSS subscales, rather than the risk of ND in Korean population. Our findings might be the first report for the association of CHRNB3-CHRNA6 cluster with ND-related phenotypes in Korean and might offer an approach to elucidating the molecular mechanisms of ND and ND-related phenotypes.