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Activation of cyclic AMP/PKA pathway inhibits bladder cancer cell invasion by targeting MAP4-dependent microtubule

Yanqiu Ou1, Xiaoke Zheng2, Yixing Gao3

  • 1Department of Pharmacology, Zhong-shan Medical College, Sun Yat-Sen University, Guangzhou, P.R. China; Guangdong Provincial Cardiovascular Institute, Guangdong General Hospital, Guangdong Provincial Academy of Medical Sciences, Guangzhou, P.R. China.

Urologic Oncology
|October 22, 2013
PubMed
Abstract

Insights

The cyclic adenosine monophosphate/protein kinase A (cAMP/PKA) pathway inhibits bladder cancer cell invasion by disrupting microtubule dynamics. Targeting this pathway, specifically through Microtubule-Associated Protein 4 (MAP4), offers a potential new therapy for invasive bladder cancer.

Area of Science:

  • Oncology
  • Cell Biology
  • Molecular Biology

Background:

  • Bladder cancer is a common urinary system malignancy known for its aggressive invasion.
  • Interfering with microtubule dynamics is a promising strategy for treating bladder cancer.
  • The role of the cyclic adenosine monophosphate/protein kinase A (cAMP/PKA) pathway in bladder cancer cell invasion requires further investigation.

Purpose of the Study:

  • To investigate the role of the cAMP/PKA pathway in human bladder cancer cell invasion.
  • To determine if cAMP/PKA signaling affects microtubule dynamics and bladder cancer cell migration.
  • To explore Microtubule-Associated Protein 4 (MAP4) as a potential target within this pathway.

Main Methods:

  • Assessed invasive and migratory capabilities of bladder cancer cell lines (T24, UM-UC-3) using transwell and scratch wound healing assays.
  • Examined microtubule (MT) dynamics via immunofluorescence and immunoblotting.
  • Investigated the role of MAP4 by gene silencing and analyzed its expression in patient samples; examined PKA-MAP4 interaction via co-immunoprecipitation.

Main Results:

  • Both cAMP elevators and MAP4 silencing potently inhibited bladder cancer cell invasion and migration by disrupting the microtubule cytoskeleton.
  • Bladder cancer grade positively correlated with MAP4 protein levels.
  • cAMP/PKA signaling disrupts the MT cytoskeleton through phosphorylation of MAP4.

Conclusions:

  • The cAMP/PKA signaling pathway inhibits bladder cancer cell invasion via MAP4-dependent microtubule dynamics.
  • Targeting the cAMP/PKA/MAP4 axis presents a potential therapeutic strategy for invasive bladder cancer.
Keywords:
Cyclic AMP/PKA pathwayHuman bladder cancerInvasionMAP4Microtubules

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