Related Experiment Video

Updated: Jun 5, 2026

Methods for Evaluating the Role of c-Fos and Dusp1 in Oncogene Dependence
10:09

Methods for Evaluating the Role of c-Fos and Dusp1 in Oncogene Dependence

Published on: January 7, 2019

[Effect of bortezomib on MAPK signaling pathway of K562/DNR cells]

Ai-Jun Liao1, Bei-Bei Fu, Hui-Han Wang

  • 1Department of Hematology, China Medical University, Shenyang 110004, Liaoning Province, China.

Zhongguo Shi Yan Xue Ye Xue Za Zhi
|December 24, 2010
PubMed

Insights

Bortezomib (BTZ) reverses daunorubicin (DNR) resistance in K562 leukemia cells by modulating the MAPK pathway. BTZ suppresses P-ERK, P-P38, and P-gp while enhancing P-JNK, increasing apoptosis.

Area of Science:

  • Cellular Biology
  • Molecular Oncology
  • Pharmacology

Context:

  • Leukemic cells often develop resistance to chemotherapy drugs like daunorubicin (DNR).
  • Understanding the mechanisms of drug resistance is crucial for developing effective treatments.
  • The mitogen-activated protein kinase (MAPK) signaling pathway plays a role in cellular responses to stress and drug treatment.

Purpose:

  • To investigate the effect of bortezomib (BTZ) on MAPK signaling (ERK, JNK, P38) in DNR-resistant K562 cells.
  • To elucidate the molecular mechanism by which BTZ overcomes drug resistance in leukemia.
  • To assess the impact of BTZ on apoptosis rates in combination with DNR.

Summary:

  • Bortezomib (BTZ) treatment in daunorubicin (DNR)-resistant K562 cells significantly suppressed phosphorylated ERK (P-ERK), phosphorylated P38 (P-P38), and P-glycoprotein (P-gp) expression.
  • Conversely, BTZ significantly enhanced phosphorylated JNK (P-JNK) expression in a time-dependent manner.
  • Combined BTZ and DNR treatment led to increased apoptosis rates compared to DNR alone, indicating reversal of drug resistance.

Impact:

  • Bortezomib demonstrates potential in overcoming chemotherapy resistance in leukemia by targeting the MAPK signaling pathway.
  • This study provides insights into the molecular mechanisms underlying BTZ's efficacy in reversing drug resistance.
  • The findings suggest that BTZ could be a valuable therapeutic agent in combination regimens for resistant leukemias.

More Related Videos

Lighting Up the Pathways to Caspase Activation Using Bimolecular Fluorescence Complementation08:47

Lighting Up the Pathways to Caspase Activation Using Bimolecular Fluorescence Complementation

Published on: March 5, 2018

Related Concept Videos

MAPK Signaling Cascades01:07

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
NF-κB-dependent Signaling Pathway02:26

NF-κB-dependent Signaling Pathway

The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
The Intrinsic Apoptotic Pathway01:31

The Intrinsic Apoptotic Pathway

Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...