Andersenhowell7816
Extracellular vesicles (EVs) can mediate drug resistance within the tumor microenvironment by delivering bioactive molecules, including proteins. Here, we performed a comparative proteomic analysis of EVs secreted by A549 lung cancer cells and their cisplatin-resistant counterparts in order to identify proteins involved in drug resistance.
Cells were co-cultivated using a transwell system to evaluate EV exchange. EVs were isolated by ultracentrifugation and analyzed using microscopy and nanoparticle tracking. EV proteome was analyzed by mass spectrometry.
EV-mediated communication was observed between co-cultured A549 and A549/CDDP cells. EVs isolated from both cells were mainly exosome-like structures. Deruxtecan cell line Extracellular matrix components, cell adhesion proteins, complement factors, histones, proteasome subunits and membrane transporters were found enriched in the EVs released by cisplatin-resistant cells.
Proteins identified in this work may have a relevant role in modulating the chemosensitivity of the recipient cells and could represent useful biomarkers to monitor cisplatin response in lung cancer.
Proteins identified in this work may have a relevant role in modulating the chemosensitivity of the recipient cells and could represent useful biomarkers to monitor cisplatin response in lung cancer.
Accumulating evidence shows that caspase-8 (Cas-8) rs3834129 genotypes determine susceptibility to various cancers, but their association with nasopharyngeal carcinoma (NPC) has not been examined. We aimed at investigating the association of Cas-8 rs3834129 with NPC risk.
Cas-8 rs3834129 genotypes and their associations with NPC risk were investigated among 176 NPC patients and 352 non-cancer subjects by the PCR-RFLP method. Additionally, the interaction of Cas-8 rs3834129 genotypes with smoking was examined.
The II, ID and DD frequencies were 56.8, 36.9 and 6.3% among NPC patients and 54.8, 38.1 and 7.1% among control subjects (p
=0.8830). Allelic frequency distribution analysis also indicated that the D allele is not a risk factor for NPC (p=0.6183). There was no interaction between Cas-8 rs3834129 and smoking and NPC risk (p=0.8305).
Cas-8 rs3834129 genotypes play a minor role in the risk for NPC.
Cas-8 rs3834129 genotypes play a minor role in the risk for NPC.
The cell-killing and radiosensitizing effects of carbon-ion (C-ion) beams with low linear energy transfer (LET) are underexplored. We aimed to demonstrate the cell-killing effects of
Co gamma rays and C-ion beams at various LET values and the radiosensitizing effect of C-ion beams at various LET and cisplatin levels.
Human uterine cervical cancer cells were irradiated with
Co gamma rays and C-ion beams at different levels of LET, with and without cisplatin treatment.
Low-LET C-ion beams had a superior cell-killing effect compared to
Co gamma rays. Survival curves under low-LET C-ion beams were more similar to that of
Co gamma rays than that of high-LET C-ion beams. Cisplatin significantly reduced cell survival after 1, 2, and 3 Gy C-ion beam irradiations at LET values of 13/30/70 keV/μm, 13/30 keV/μm, and 13 keV/μm, respectively.
Low-LET C-ion beams combined with cisplatin have higher radiosensitizing effects than high-LET C-ion beams.
Low-LET C-ion beams combined with cisplatin have higher radiosensitizing effects than high-LET C-ion beams.
Cytokine-induced killer (CIK) cells are a heterogenous population of immune cells showing promising applications in immunotherapeutic cancer treatment. Neuropilin (NRP) proteins have been proven to play an important role in cancer development and prognosis. In this study, CIK cells were tested for expression of NRPs, transmembrane proteins playing a role in the proliferation and survival of cancer cells.
CIK cells were analyzed at different time points via flow cytometry and quantitative real-time polymerase chain reaction for neuropilin expression.
Phenotyping results showed CIK cells having developed properly, and low levels of NRP2 were detected. On the other hand, no NRP1 expression was found. Two cancer cell lines were tested by flow cytometry A549 cells expressed NRP1 and NRP2; U251-MG cells expressed high amounts of NRP2. CIK cell showed low levels of NRP2 expression on day 14.
The presence of NRP2, but not NRP1, was shown for CIK cells. Recognizing NRP2 in CIK cells might help to improve CIK cell cytotoxicity.
The presence of NRP2, but not NRP1, was shown for CIK cells. Recognizing NRP2 in CIK cells might help to improve CIK cell cytotoxicity.
γδ T cells mediate cytotoxicity against prostate cancer (PCa) cells in vitro; however, the clinical efficacy of γδ T cell-targeted immunotherapy for recurrent and metastatic PCa is unsatisfactory. We hypothesized that the resistance of recurrent and metastatic PCa to γδ T cells is related to the presence of prostate cancer stem cells (PCSCs), and we examined their relationship.
PCa spheres (prostaspheres) were generated from five PCa cell lines, and their susceptibility to cytotoxicity by γδ T cells was investigated. Expression of stemness-related markers was evaluated by qRT-PCR.
Prostasphere-derived cancer cells were resistant to lysis by γδ T cells and expressed higher levels of several stemness markers, including CD133, NANOG, SOX2, and OCT4, than the parental PCa cell lines.
Ex vivo-expanded γδ T cells are not effective against PCSCs.
Ex vivo-expanded γδ T cells are not effective against PCSCs.
Accurate regulation of the spindle assembly checkpoint (SAC) and anaphase promoting complex/cyclosome (APC/C) are essential for the correct execution of mitosis. In this work, we focused on MAD2L2 (REV7), a central translesion (TLS) protein, which also functions as a mitotic regulator by inhibiting APC/C in prometaphase.
Using bioinformatics analysis, live cell imaging and APC/C protein binding and degradation assays, we explored the influence of MAD2L2 over-expression in breast cancer.
A significant over-expression of MAD2L2 was found in triple negative breast cancers (TNBC), compared to other breast cancers, correlating to poor patient prognosis. We also identified significant over-expression of MAD2L2 in the MDA-MB-157 triple negative (TN) cell line. A high percentage of MDA-MB-157 cells failed to complete mitosis and died during mitosis or shortly after. In addition, these cells completed mitosis at a significantly slower rate than control cells. MDA-MB-157 cells present high levels of mitotic slippage upon nocodazole treatment and acute dysregulation in APC/C function and substrate degradation.
