RecX protein abrogates ATP hydrolysis and strand exchange promoted by RecA: insights into negative regulation of homologous recombination

In many eubacteria, coexpression of recX with recA is essential for attenuation of the deleterious effects of recA overexpression; however, the molecular mechanism has remained enigmatic. Here, we show that Mycobacterium tuberculosis RecX binds directly to M. tuberculosis RecA as well as M. smegmatis and E. coli RecA proteins in vivo and in vitro, but not single-stranded DNA binding protein. The direct association of RecX with RecA failed to regulate the specificity or extent of binding of RecA either to DNA or ATP, ligands that are central to activation of its functions. Significantly, RecX severely impeded ATP hydrolysis and the generation of heteroduplex DNA promoted by homologous, as well as heterologous, RecA proteins. These findings reveal a mode of negative regulation of RecA, and imply that RecX might act as an anti-recombinase to quell inappropriate recombinational repair during normal DNA metabolism.     

Comparison of Management of Mandibular Angle Fractures by Three Approaches

Background and Objectives

Various methods have been reported in the literature for treating mandibular angle fractures comparing extra oral, intra oral and transbuccal approaches for achieving the goals of restoration of anatomic form, maintenance of segment position and bony union.

Materials and Methods

This study was conducted to assess the simple and effective surgical approach in treating mandibular angle fractures and the outcome by means of three approaches i.e. intra oral, transbuccal and extra oral approaches.

Results/Conclusion

A total of 45 patients with mandibular angle fracture were divided into three groups. Group I—intra oral approach—15 patients, Group II—transbuccal with intraoral approach—15 patients, Group III—extra oral approach—15 patients. The results of our study found intraoral approach to be much better because it is simple, precise, duration is short, and post operative complications are less with minimal morbidity and pain.     

Pruni cortex ameliorates skin inflammation possibly through HMGB1-NFκB pathway in house dust mite induced atopic dermatitis NC/Nga transgenic mice

Pruni cortex, the bark of Prunus jamasakura Siebold ex Koidzumi, has been used in the Japanese systems of medicine for many years for its anti-inflammatory, antioxidant and antitussive properties. In this study, we investigated the effect of pruni cortex on atopic dermatitis NC/Nga mouse model. Atopic dermatitis-like lesion was induced by the application of house dust mite extract to the dorsal skin. After induction of atopic dermatitis, pruni cortex aqueous extract (1 g/kg, p.o.) was administered daily for 2 weeks. We evaluated dermatitis severity, histopathological changes and cellular protein expression by Western blotting for nuclear and cytoplasmic high mobility group box 1, receptor for advanced glycation end products, nuclear factor κB, apoptosis and inflammatory markers in the skin of atopic dermatitis mice. The clinical observation confirmed that the dermatitis score was significantly lower when treated with pruni cortex than in the atopic dermatitis group. Similarly pruni cortex inhibited hypertrophy and infiltration of inflammatory cells as identified by histopathology. In addition, pruni cortex significantly inhibited the protein expression of cytoplasmic high mobility group box 1, receptor for advanced glycation end products, nuclear p-nuclear factor kappa B, apoptosis and inflammatory markers. These results indicate that pruni cortex may have therapeutic potential in the treatment of atopic dermatitis by attenuating high mobility group box 1 and inflammation possibly through the nuclear factor κB pathway.     

Outcomes of congenital heart disease in late preterm infants: double jeopardy?

Aim: To evaluate outcomes of late preterm (34–36 6/7 weeks gestation) infants with congenital heart defects requiring surgical intervention during initial admission (added), in comparison with term (37–42 weeks) controls. Methods: This was a retrospective chart review of consecutive late preterm and term infants with congenital heart lesions, requiring surgical intervention during initial admission. Results: Our cohort (n = 88) comprised 26 late preterm infants (group 1) and 62 term controls (group 2). The two groups differed significantly in mean (SD) gestation [34.5 (1.5) vs. 39.1 (1) weeks)], birth weight [2335 (402) vs. 3173 (401) g] and weight [2602 (739) vs. 3273 (507) g] and age [33 (51) vs. 11 (14) days] at surgery. Cardiac diagnosis frequencies were similar in both groups. The mean (SD) duration of PGE1 [31.9 (56.8) vs. 11.3 (24.9) days] and need for preoperative pressors (25% vs. 8%) were significantly higher in group 1. Death (23% vs. 8%, p = 0.05) tended to be higher in group 1. Rates of necrotizing enterocolitis (23% vs. 1.7%), seizures (19% vs. 0%), oxygen need (12% vs. 0%) and gavage feeds (12% vs. 1.6%) at discharge were all significantly higher in the late preterm cohort. Conclusions: These data highlight the extreme vulnerability of infants with the ‘double hits’ of prematurity and heart defects.     

Analysis of hesitancy and motivational factors for COVID-19 vaccination among patients presenting to eye care hospitals – A multicenter questionnaire-based survey

Purpose:To analyze the hesitancy and motivational factors related to coronavirus disease 2019 (COVID-19) vaccination among patients visiting for eye care.Methods:A telephonic survey was conducted using validated questionnaires consisting of 36 questions in five sections from July 1 to July 31, 2021. Patients visiting six tertiary centers and one secondary center of our eye hospitals were interviewed over their phones, and their responses were entered onto the Google forms. The responses were recorded as demographics, health status, awareness about vaccination, factors contributing to hesitancy or acceptance to vaccinate, and general perception about the vaccine.Results:A total of 5033 patients were surveyed. The mean age was 49.0 ± 14.2 years. A total of 563 (11.2%) patients gave a history of symptoms or were tested positive for COVID-19; 2225 (44.2%) patients were already COVID-19 vaccinated. Around 2883 (56%) patients were aware of getting infection despite vaccination, and 4092 (81.3%) perceived vaccination should be compulsory. The main reason for vaccination hesitancy was the fear of side effects (n = 487, 17.3%). The fear of getting infected was the most common reason for vaccination (n = 911, 40.9%). Factors associated with a lower proportion of vaccinated individuals included younger age (P < 0.001), female gender (P < 0.001), lower education (P < 0.001), lower income (P < 0.001), and rural residence (P = 0.33).Conclusion:Creating awareness about the minor side effects and reassurance can allay an individual’s fears. The fear associated with the rapid spread of infection and associated mortality needs to be utilized to increase vaccination acceptance. A targeted approach toward groups with poor uptake of vaccination is necessary.