The culture supernatant of Leuconostoc mesenteroides TK41401, isolated from Japanese pickles, possessed antimicrobial activity against broad range of a bacterial genera and particularly strong activity against Bacillus coagulans, the major contaminant of pickles. An antimicrobial peptide was purified in three chromatographic steps, and its molecular mass was determined to be 6,115.59 Da by electrospray ionization time-of-flight mass spectrometry (ESI-TOF MS). The primary structure of this peptide was determined by amino acid and DNA sequencing, and these analyses revealed that it was translated as a 63-residue precursor. This precursor showed high similarity to the precursor of lactocyclicin Q, a cyclic bacteriocin produced by Lactococcus sp. strain QU 12. The molecular weight calculated after cyclization, which was presumed to involve the same process as in lactocyclicin Q (between L3 and W63), agreed with that estimated by ESI-TOF MS. This peptide was proved to be a novel cyclic bacteriocin, and it was termed leucocyclicin Q. The antimicrobial spectrum of this bacteriocin clearly differed from that of lactocyclicin Q, even though their primary structures were quite similar. This is the first report of a cyclic bacteriocin produced by a strain of the genus Leuconostoc.
Purpose: The aim of this study was to investigate the association between interpersonal relationships and the risk of MDD in freshmen.
Methods: 6,947 participants without baseline MDD (lifetime) completed the 1-year follow-up survey in 2019. Demographic information, interpersonal relationship scores measured by the Chinese version of Interpersonal Relationship Comprehensive Scale, depression severity at baseline screened with Patient Health Questionnaire-9, lifetime severe traumatic events and MDD at baseline and follow-up survey screened via the Composite International Diagnostic Interview 3.0 were collected. Logistic regression was performed to quantify the associations between interpersonal relationships and the new-onset of MDD.
Results: The baseline total relationship score (9 to 14, mild relationship distress) and the dimension score of dealing with people were positively associated with MDD incidence, respectively (OR total score=1.68, 95%CI: 1.16-2.43; OR dealing with people=1.39, 95%CI: 1.10-1.75). Interpersonal relationship score was not associated with MDD in participants without baseline depressive symptoms. However, it was positively associated with MDD (OR=2.10, 95%CI: 1.40-3.15) among participants with baseline depressive symptoms. There was a statistically significant interactions between dealing with people and baseline PHQ-9 score for the risk of MDD.
Conclusions: Interpersonal relationship perplex can increase the risk of MDD in college students. College students suffering from depressive symptoms without MDD yet who have interpersonal disorder deserve more attention in terms of prevention against MDD.
Stressful life events (SLEs) closely correlates with depressive symptoms. Although vulnerability-stress model suggests SLEs interacted with dysfunctional attitudes (DA) to predict depression, the mediation role of DA is poorly understood. Therefore, this study intended to investigate the mediating role of DA and the moderating role of sex between SLEs and self-reported depression. A cross-sectional survey was conducted with a sample of 7769 Chinese college students. Participants were assessed in terms of self-reported SLEs, DA and depression variables. Results showed that there were significant sex differences in both SLE and DA. DA mediated the association between SLE and self-reported depression. The moderated mediation model analysis showed that the interaction of SLEs and sex significantly predicted DA in mediator variable model and self-reported depression in dependent variable model. Results indicated that DA partially mediated the association between SLEs and self-reported depression, and sex moderates the association between SLEs and both DA and self-reported depression, which females have bigger changes of DA and depressive symptoms across low and high levels of SLEs than males.
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