Rget CFTR. Both pollutants increased miR-101 and miR-144 but had no effect on miR-145. Since cadmium is a contaminant of cigarette smoke, it is possible that cadmium present in cigarette smoke was responsible for the up-regulation of miR-101 and miR144. Interestingly, the cytokine IL-17A was recently identified to up-regulate miR-101 via activation of the Akt pathway in cardiac fibroblasts [21]. Since both cigarette smoke and cadmium activate the Akt pathway [26-28], it is possible that up-regulation of miR101 occurs via a similar pathway in the lung. Taken together, our results indicate that up-regulation of miR101 and/or miR144 could contribute to the suppression of CFTR observed in COPD patients. In addition, Clunes et al. recently showed that exposure of EAI045 cost primary airway epithelial cells to shortterm cigarette smoke lead to mucus dehydration [17]. Therefore, up-regulation of miR-101 by cigarette smoke or cadmium could affect lung fluid homeostasis and therefore mucus clearance by suppressing CFTR but also immune responses by preventing dephosphorylation of MAPKs due to inhibition of MKP-1. Future studies need to be done to investigate the effect of smoking cessation on CFTR expression and miRNAs regulating its expression. Our study highlights the role of miRNAs as genetic modifiers that may contribute to chronic bronchitis by altering expression of CFTR that regulates lung epithelial surface hydration.Author ContributionsConceived and designed the experiments: GJN ECB. Performed the experiments: FH GJN MC. Analyzed the data: PNB SK SPNS ECB.MiR-101 and -144 Regulate CFTR ExpressionContributed reagents/materials/analysis tools: GJN SPNS ECB. Wrote the paper: PNB ECB.
The main HIV-1 gateway in male-to-female transmission is believed to be the STA-4783 cervico-vaginal mucosa where the infection of the first target cell(s) occurs, followed by a local viral amplification, which precedes the establishment of the systemic infection [1]. Recent data indicate that out of diverse HIV-1 quasispecies in the infecting partner, in more than 80 of clade B transmission cases, a single viral variant, predominantly of R5 phenotype, establishes infection [2,3]. At least two hypotheses may explain this result: Either the transmission of a given variant is a stochastic process accompanied by mechanisms that prevent the transmission/amplification of other viruses, or transmitted viruses have specific traits to overcome the multiple “gatekeepers” of the vaginal mucosa. The recent isolation and cloning of T/F virus envelopes and fulllength infectious clones enables the study of their properties under controlled conditions. We used recently described [4] isogenic, replication-competent proviral constructs in which the env sequences encoding the ectodomain (gp120 and ectodomain of gp41) of the Env glycoporotein were derived from either T/F HIV-1 variants or chronic/reference (C/R) HIV-1 strains utilized as control viruses. We studied transmission of these viruses in a recently developed system [5] of collagen raft-supported blocks of human cervical tissue. To investigate the abilities of several HIV-1 strains toinitiate infection in human cervical tissue ex vivo, we investigated the efficiencies of viral replication, the cellular targets of these viruses, and the target cell activation status.Materials and Methods HIV-1 Virus StrainsWe recently described a molecular approach to express env sequences of interest in cis in isogenic, replication-competent, NL43-based ba.Rget CFTR. Both pollutants increased miR-101 and miR-144 but had no effect on miR-145. Since cadmium is a contaminant of cigarette smoke, it is possible that cadmium present in cigarette smoke was responsible for the up-regulation of miR-101 and miR144. Interestingly, the cytokine IL-17A was recently identified to up-regulate miR-101 via activation of the Akt pathway in cardiac fibroblasts [21]. Since both cigarette smoke and cadmium activate the Akt pathway [26-28], it is possible that up-regulation of miR101 occurs via a similar pathway in the lung. Taken together, our results indicate that up-regulation of miR101 and/or miR144 could contribute to the suppression of CFTR observed in COPD patients. In addition, Clunes et al. recently showed that exposure of primary airway epithelial cells to shortterm cigarette smoke lead to mucus dehydration [17]. Therefore, up-regulation of miR-101 by cigarette smoke or cadmium could affect lung fluid homeostasis and therefore mucus clearance by suppressing CFTR but also immune responses by preventing dephosphorylation of MAPKs due to inhibition of MKP-1. Future studies need to be done to investigate the effect of smoking cessation on CFTR expression and miRNAs regulating its expression. Our study highlights the role of miRNAs as genetic modifiers that may contribute to chronic bronchitis by altering expression of CFTR that regulates lung epithelial surface hydration.Author ContributionsConceived and designed the experiments: GJN ECB. Performed the experiments: FH GJN MC. Analyzed the data: PNB SK SPNS ECB.MiR-101 and -144 Regulate CFTR ExpressionContributed reagents/materials/analysis tools: GJN SPNS ECB. Wrote the paper: PNB ECB.
The main HIV-1 gateway in male-to-female transmission is believed to be the cervico-vaginal mucosa where the infection of the first target cell(s) occurs, followed by a local viral amplification, which precedes the establishment of the systemic infection [1]. Recent data indicate that out of diverse HIV-1 quasispecies in the infecting partner, in more than 80 of clade B transmission cases, a single viral variant, predominantly of R5 phenotype, establishes infection [2,3]. At least two hypotheses may explain this result: Either the transmission of a given variant is a stochastic process accompanied by mechanisms that prevent the transmission/amplification of other viruses, or transmitted viruses have specific traits to overcome the multiple “gatekeepers” of the vaginal mucosa. The recent isolation and cloning of T/F virus envelopes and fulllength infectious clones enables the study of their properties under controlled conditions. We used recently described [4] isogenic, replication-competent proviral constructs in which the env sequences encoding the ectodomain (gp120 and ectodomain of gp41) of the Env glycoporotein were derived from either T/F HIV-1 variants or chronic/reference (C/R) HIV-1 strains utilized as control viruses. We studied transmission of these viruses in a recently developed system [5] of collagen raft-supported blocks of human cervical tissue. To investigate the abilities of several HIV-1 strains toinitiate infection in human cervical tissue ex vivo, we investigated the efficiencies of viral replication, the cellular targets of these viruses, and the target cell activation status.Materials and Methods HIV-1 Virus StrainsWe recently described a molecular approach to express env sequences of interest in cis in isogenic, replication-competent, NL43-based ba.
