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In Vitro and In Vivo Approaches to Determine Intestinal Epithelial Cell Permeability
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Type 2 cGMP-dependent protein kinase regulates homeostasis by blocking c-Jun N-terminal kinase in the colon

R Wang1, I-K Kwon1, N Singh1

  • 1Department of Biochemistry and Molecular Biology, Cancer Research Center, Georgia Regents University, Augusta, GA, USA.

Cell Death and Differentiation
|November 26, 2013
PubMed

Insights

Increasing cyclic guanosine monophosphate (cGMP) with Vardenafil impacts colon homeostasis by activating protein kinase G2 (PKG2). This mechanism involves DUSP10 and inhibits JNK, offering potential therapeutic strategies for gut disorders.

Area of Science:

  • Gastroenterology
  • Molecular Biology
  • Cellular Signaling

Background:

  • Cyclic guanosine monophosphate (cGMP) plays a role in gut homeostasis, but its precise signaling mechanism remains unclear.
  • Understanding cGMP's role is crucial for developing targeted therapies for intestinal diseases.

Purpose of the Study:

  • To investigate whether elevated cGMP levels influence colon homeostasis.
  • To elucidate the molecular mechanism by which cGMP affects colon epithelial cells.

Main Methods:

  • Treatment of wild-type (Prkg2(+/+)) and knockout (Prkg2(-/-)) mice with Vardenafil (a PDE5 inhibitor) to increase cGMP.
  • Quantification of colon mucosal proliferation, differentiation, and apoptosis.
  • Analysis of dual specificity protein phosphatase 10 (DUSP10) and phospho-c-Jun N-terminal kinase (JNK) levels.
  • In vitro studies using LS174T cells and in vivo colitis models (DSS-induced).

Main Results:

  • Vardenafil treatment increased cGMP and modulated proliferation, differentiation, and apoptosis in Prkg2(+/+) mice, but not in Prkg2(-/-) mice.
  • Vardenafil and cGMP increased DUSP10 expression and reduced JNK activity in a protein kinase G2 (PKG2)-dependent manner.
  • Inhibition of JNK reversed defective homeostasis in Prkg2(-/-) mice, and Vardenafil protected against DSS-induced colitis.

Conclusions:

  • Vardenafil-induced cGMP signaling, mediated by PKG2, enhances colon homeostasis by suppressing proliferation/apoptosis and promoting differentiation.
  • The mechanism involves upregulation of DUSP10, leading to JNK pathway inhibition.
  • This study reveals a novel cGMP-PKG2-DUSP10-JNK signaling axis critical for intestinal epithelial health and offers therapeutic potential.

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