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Related Experiment Video

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Modeling Chemotherapy Resistant Leukemia In Vitro
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Exosomes derived from bone marrow stromal cells decrease the sensitivity of leukemic cells to etoposide.

Jianling Wang1,2, Dong Li3, Yong Zhuang2

  • 1Shenzhen Research Institute of Shandong University, Shenzhen, Guangdong 518057, P.R. China.

Oncology Letters
|September 21, 2017
PubMed
Summary
This summary is machine-generated.

Bone marrow stromal cell-derived exosomes promote chemoresistance in NALM-6 cells against etoposide (VP16). These exosomes enhance cell viability and inhibit apoptosis by modulating key proteins like BCL-2, BAX, caspase-3, and PARP.

Keywords:
VP16chemoresistanceexosomesleukemic cells

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Oncology

Background:

  • Chemotherapy resistance is a major challenge in treating B-cell acute lymphoblastic leukemia (B-ALL).
  • Exosomes, small extracellular vesicles, play roles in intercellular communication and can influence cancer cell behavior.
  • Bone marrow stromal cells (BM-SCs) are crucial components of the bone marrow microenvironment that can impact leukemia cell survival.

Purpose of the Study:

  • To investigate the effect of exosomes derived from BM-SCs on the chemoresistance of NALM-6 cells treated with etoposide (VP16).
  • To elucidate the molecular mechanisms underlying exosome-mediated chemoresistance in this model.

Main Methods:

  • Isolation and characterization of exosomes from BM-SC-conditioned medium using differential centrifugation and western blot analysis (HSP70, CD63).
  • Co-culture of NALM-6 cells with BM-SC-derived exosomes in the presence of VP16.
  • Assessment of cell viability (Cell Counting Kit-8) and apoptosis (Annexin-V/propidium iodide staining).
  • Western blot analysis to determine protein levels of BCL-2, BAX, caspase-3, and PARP.

Main Results:

  • BM-SC-derived exosomes were successfully isolated and characterized.
  • Co-culture with exosomes significantly increased NALM-6 cell viability and inhibited VP16-induced apoptosis.
  • Exosomes prevented the VP16-induced decrease in BCL-2, full-length caspase-3, and full-length PARP.
  • Exosomes inhibited the VP16-induced increase in BAX, cleaved caspase-3, and cleaved PARP.

Conclusions:

  • Exosomes derived from BM-SCs can induce chemoresistance in NALM-6 cells against etoposide (VP16).
  • BM-SC exosomes protect NALM-6 cells from VP16-induced apoptosis, promoting cell survival.
  • The observed drug resistance mechanism involves the modulation of BCL-2/BAX ratio, caspase-3, and PARP pathways.