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Stimulation of Stem Cell Niches and Tissue Regeneration in Mouse Skin by Switchable Protoporphyrin IX-Dependent Photogeneration of Reactive Oxygen Species In Situ
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Stimulation of Stem Cell Niches and Tissue Regeneration in Mouse Skin by Switchable Protoporphyrin IX-Dependent Photogeneration of Reactive Oxygen Species In Situ

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TAK1 regulates reactive oxygen species and cell death in keratinocytes, which is essential for skin integrity

Emily Omori1, Sho Morioka, Kunihiro Matsumoto

  • 1Department of Environmental and Molecular Toxicology, North Carolina State University, Raleigh, North Carolina 27695-7633, USA.

The Journal of Biological Chemistry
|July 9, 2008
PubMed

Insights

Tak1 deficiency in skin cells increases reactive oxygen species (ROS), leading to inflammation. Antioxidant treatment reduced this inflammation, highlighting TAK1

Area of Science:

  • Dermatology
  • Molecular Biology
  • Immunology

Background:

  • Tak1 (ྟransformational growth factor-beta-activated kinase 1) is crucial for skin homeostasis.
  • Keratinocyte-specific Tak1 deletion leads to severe skin inflammation and hypersensitivity to tumor necrosis factor (TNF).

Purpose of the Study:

  • To elucidate the mechanisms behind Tak1-deficient keratinocytes' hypersensitivity to TNF and oxidative stress.
  • To investigate the role of Tak1 in regulating reactive oxygen species (ROS) in keratinocytes.

Main Methods:

  • Utilized a mouse model with keratinocyte-specific Tak1 deletion.
  • Assessed ROS levels and cell death in response to TNF and oxidative stress.
  • Investigated the role of NF-kappaB and c-Jun pathways.
  • Administered antioxidant treatment in vivo.

Main Results:

  • Tak1 deficiency significantly increased ROS production in keratinocytes, causing cell death upon TNF or oxidative stress.
  • Tak1-regulated ROS production independently of the NF-kappaB pathway.
  • c-Jun levels were reduced in Tak1-deficient keratinocytes; its ectopic expression partially protected against TNF-induced ROS and cell death.
  • In vivo antioxidant treatment ameliorated skin inflammation in Tak1-deficient mice.

Conclusions:

  • Tak1 plays a critical role in preventing ROS-induced skin inflammation.
  • Tak1 regulates ROS production, at least partially, through the c-Jun pathway.
  • Targeting ROS may be a therapeutic strategy for inflammatory skin conditions associated with Tak1 dysfunction.

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