Acking evaluation and transmission electron microscopy. Prior to EV collection, AT-MSCs had been modified to overexpress miR-424 by way of electroporation, and miRNA mimics transfection. The miRNAs targeting PD-L1 was predicted based on in silico analysis. The direct regulation of miR-424 on PD-LISEV2019 ABSTRACT BOOKwas verified through the 3′-UTR luciferase report assays. The purified EVs have been added to the recipient MDAMB-231 cells (MM-231). The expression of PD-L1 mRNA and protein was analysed through qRT-PCR and western blot, respectively. Outcomes: We found that miR-424 straight regulated the expression of PD-L1 by way of the binding to PD-L1 3’UTR. Additionally, the expression of PD-L1 in MM-231 cells was down-regulated as well as the expression of miR-424 in MM-231 was up-regulated after coculture with exosomes derived from regular AT-MSCs, and AT-MSCs with miR-424 overexpression. Moreover, the cell viabilities of MM-231 were decreased immediately after coculture with exosomes or transfected with miR-424 mimics. Summary/Conclusion: EVs derived from AT-MSCs could transfer functional miR-424 to TNBC cell lines and promote the apoptosis by way of decreased immunenegative PD-L1/PD-1 pathway. Funding: This function was supported by Project for Cancer Analysis and Therapeutic Evolution [PCREATE; grant quantity:17cm0106402h0002], MEXT KAKENHI [Grant-in-Aid for Young Scientists (A); grant number: 17H04991] and China Scholarship Council [grant quantity: 201706090122].OT06.Exosomal delivery of NF-B repressor delays LPS-induced preterm birth in mouse models Samantha Sheller-Millera, Kyungsun Choi, George Saade, Chulhee Choib and Ramkumar Menona(1 1010) or na e exosomes (exosomes derived from HEK293T cells under standard culture situations, 1 1010) every 2 h to get a total of five injections. Remedy groups (Group 1-LPS+PBS; Group 2-LPS +SR; Group 3-LPS+na e, and Group 4-PBS) have been monitored for preterm birth. Upon delivery of at the very least 1 pup in Group 1, mice have been euthanized, and maternal plasma, uterus and cervix have been collected for cytokine evaluation applying Luminex (IL-1, IL-8 and IL-10) and Western blot for NF-B activation via RelA phosphorylation (P-NF-B), respectively. Survival graphs were created in GraphPad and one-way ANOVA was performed to establish statistical significance (P 0.05). Benefits: Animals injected with PBS delivered in the anticipated gestational age (19.five days). LPS and LPS + na CD1b Proteins custom synthesis e-induced PTB within 10 h; even so, injection of SR exosomes prolonged delivery by an average of 21 h in this model. Consistently reduced levels of proinflammatory cytokines, IL-1 and IL-8, have been observed in maternal plasma of LPS + SR in comparison with LPS mice, while anti-inflammatory cytokine, IL-10, levels had been considerably enhanced in LPS + SR mice in comparison with LPS (P = 0.01) and PBS controls (P 0.0001). Inside the cervix and uterus, P-NF-B expression was significantly decreased in LPS + SR in comparison with LPS (P = 0.005, P = 0.03) (Figure 2B). Summary/Conclusion: Exosomes is often engineered to carry pharmaceutical agents which can dampen the infection-induced inflammation linked with PTB and pPROM.University of Texas Healthcare Branch, Galveston, USA; bKAIST, Daejeon, Republic of KoreaOT06.Technologies for loading RNA-based therapeutics into extracellular vesicles for drug delivery Olga Shatnyevaa, Anders Gunnarssonb, Euan 4-1BB/CD137 Proteins custom synthesis Gordonc, Elisa L aro-Ib ezd, Lavaniya Kunalingamc, Xabier Osteikoetxeae, Kristina Friisc, Marcello Marescac and Niek Dekkerba cIntroduction: Intraamniotic infection and inflammation are linked w.