Exon Junction Complex Mediates the Cap-Independent Translation of Circular RNA.

Evidence that circular RNAs (circRNA) serve as protein template is accumulating. However, how the cap-independent translation is controlled remains largely uncharacterized. Here, we show that the presence of intron and thus splicing promote cap-independent translation. By acquiring the exon junction complex (EJC) after splicing, the interaction between circRNA and ribosomes was promoted, thereby facilitating translation. Prevention of splicing by treatment with spliceosome inhibitor or mutating splicing signal hindered cap-independent translation of circRNA. Moreover, EJC-tethering using Cas13 technology reconstituted EJC-dependent circRNA translation. Finally, the level of a coding circRNA from succinate dehydrogenase assembly factor 2 (circSDHAF2) was found to be elevated in the tumorous tissues from patients with colorectal cancer, and shown to be critical in tumorigenesis of colorectal cancer in both cell and murine models. These findings reveal that EJC-dependent control of circSDHAF2 translation is involved in the regulation of oncogenic pathways. IMPLICATIONS: EJC-mediated cap-independent translation of circRNA is implicated in the tumorigenesis of colorectal cancer.

A six-week acupoint stimulation intervention for quitting smoking.

This study creates a six-week acupoint stimulation program for quitting smoking by conducting an experimental research design and then evaluating its effects. A total of 59 smokers, 28 +/- 7.6 years of mean age, volunteered to participate and were randomly assigned to the experimental or sham group. The current investigation administered anti-smoking acupoints to the experimental group for six weeks, whereas the sham group used sham acupoints for six weeks. Before and after the six-week intervention, the participants completed questionnaires and offered blood samples. This research collected data of demographic factors, serum cotinine, carbon monoxide exhalation, daily tobacco consumption, and quit smoking rate of participants before and after the six-week intervention. After the intervention, it showed no significant differences in the serum level of cotinine and carbon monoxide exhalation between the two groups. The quit rate in the experimental group was 13.3% and 13.7% in the sham group. However, daily tobacco consumption was 10 cigarettes in the experimental group and 11.21 cigarettes in the sham group. This experimental study used the sham group as the control, resulting in no statistically significant findings. Future studies need more evidence-based research on the exact effect or placebo effect of acupoint stimulation and the appropriate design for sham acupoint, to examine quitting effect using acupoint stimulation in adult smokers.

[Acupoint stimulation as a smoking cessation therapy].

The purpose of this article was to review the literature on the effectiveness of stopping smoking through acupoint stimulation. Topics of interest included traditional Chinese medicine theory, acupoints selected for use in smoking cessation therapies, and the effectiveness and outcomes of acupoint stimulation therapies targeting smoking cessation. It is hoped that this article provides valuable knowledge and information on an alternative smoking cessation approach to give medical professionals additional options when assisting patients to quit smoking.