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P-glycoproteins (Pgp) have been proposed as contributors to the widespread macrocyclic lactone (ML) resistance in several nematode species including a major pathogen of foals, Parascaris univalens. Using new and available RNA-seq data, ten different genomic loci encoding Pgps were identified and characterized by transcriptome-guided RT-PCRs and Sanger sequencing. Phylogenetic analysis revealed an ascarid-specific Pgp lineage, Pgp-18, as well as two paralogues of Pgp-11 and Pgp-16. Comparative gene expression analyses in P. univalens and Caenorhabditis elegans show that the intestine is the major site of expression but individual gene expression patterns were not conserved between the two nematodes. In P. univalens, PunPgp-9, PunPgp-11.1 and PunPgp-16.2 consistently exhibited the highest expression level in two independent transcriptome data sets. Using RNA-Seq, no significant upregulation of any Pgp was detected following in vitro incubation of adult P. univalens with ivermectin suggesting that drug-induced upregulation is not the mechanism of Pgp-mediated ML resistance. Expression and functional analyses of PunPgp-2 and PunPgp-9 in Saccharomyces cerevisiae provide evidence for an interaction with ketoconazole and ivermectin, but not thiabendazole. Overall, this study established reliable reference gene models with significantly improved annotation for the P. univalens Pgp repertoire and provides a foundation for a better understanding of Pgp-mediated anthelmintic resistance.
Available therapeutic strategies for cancers have developed side effects, resistance, and recurrence that cause lower survival rates. Utilizing targeted drug delivery techniques has opened up new hopes for increasing the efficacy of cancer treatment. The current study aimed to investigate the appropriate condition of primming human amniotic epithelial cells (hAECs) with paclitaxel as a dual therapeutic approach consisting of inherent anticancer features of hAECs and loaded paclitaxel. The effects of paclitaxel on the viability of hAECs were evaluated to find an appropriate loading period. The possible mechanism of hAECs paclitaxel resistance was assessed using verapamil. Afterward, the loading and releasing efficacy of primed hAECs were evaluated by HPLC. The anti-neoplastic effects and apoptosis as possible mechanism of conditioned media of paclitaxel-loaded hAECs were assessed on breast and cervical cancer cell lines. hAECs are highly resistant to cytotoxic effects of paclitaxel in 24 h. Evaluating the role of P-glycoproteins in hAECs resistance showed that they do not participate in hAECs resistance. The HPLC demonstrated that hAECs uptake/release paclitaxel with optimum efficacy in 8000 ng/ml treatment. Assessing the anti-proliferative effect of primed hAECs condition media on cancer cells showed that the secretome induced 3.3- and 4.8-times more potent effects on MCF-7 and HeLa, respectively, and enhanced the apoptosis process. These results suggest that hAECs could possibly be used as a drug delivery system for cancer treatment. Besides, inherent anticancer effects of hAECs were preserved during the modification process. Synergistic anticancer effects of paclitaxel and hAECs can be translated into clinical practice, which would be evaluated in the future studies.
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