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Targeting asparagine and autophagy for pulmonary adenocarcinoma therapy

Boyang Zhang1, Jiajun Fan2, Xuyao Zhang2

  • 1Research Center for Clinical Pharmacology, Nanfang Hospital, Southern Medical University, No. 1838 Guangzhou Road, Guangzhou, 510515, China.

Applied Microbiology and Biotechnology
|June 3, 2016
PubMed

Insights

Targeting asparagine and autophagy offers a novel therapy for lung adenocarcinoma (ADCA). Depriving cancer cells of asparagine triggers autophagy, but inhibiting this protective mechanism enhances cell death and apoptosis.

Area of Science:

  • Oncology
  • Cell Biology
  • Biochemistry

Background:

  • Lung adenocarcinoma (ADCA) presents a significant global health challenge with poor patient prognosis and high mortality rates.
  • Existing therapeutic strategies for ADCA often face limitations, necessitating the exploration of novel treatment approaches.

Purpose of the Study:

  • To investigate a new therapeutic strategy for lung ADCA by targeting asparagine metabolism and autophagy.
  • To evaluate the efficacy of asparaginase in inducing cytotoxicity and apoptosis in lung ADCA cells.
  • To elucidate the role of autophagy and reactive oxygen species (ROS) in response to asparagine deprivation therapy.

Main Methods:

  • Utilized asparaginase to deprive lung ADCA cells (A549 and H1975) of asparagine, assessing cytotoxicity and apoptosis.
  • Characterized the autophagic flux, including autophagosome formation, lysosomal fusion, and degradation.
  • Investigated the impact of autophagy suppression on asparaginase-induced effects.
  • Examined the role of ROS in the therapeutic mechanism by modulating ROS levels and assessing cellular responses.

Main Results:

  • Asparaginase treatment induced significant cytotoxicity and apoptosis in lung ADCA cells.
  • Asparagine deprivation triggered autophagy, a cytoprotective mechanism involving autophagosome formation, lysosomal fusion, and degradation.
  • Inhibiting autophagy potentiated asparaginase-induced cytotoxicity and accelerated caspase 3-dependent apoptosis.
  • ROS played a crucial role, with its suppression attenuating cytotoxicity and autophagy, while autophagy inhibition promoted ROS generation.

Conclusions:

  • Targeting both cytoprotective autophagy and asparagine metabolism presents a potent therapeutic strategy for lung ADCA.
  • The combination of asparagine deprivation and autophagy inhibition offers a promising novel approach for clinical application in treating lung ADCA.
  • Reactive oxygen species are integral to the efficacy of asparagine deprivation therapy in lung ADCA cells.
Keywords:
ApoptosisAsparaginaseAsparagine deprivation therapyAutophagyReactive oxygen species

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