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Isolation and Culture of Primary Mouse Keratinocytes from Neonatal and Adult Mouse Skin
10:51

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Published on: July 14, 2017

RIP4 regulates epidermal differentiation and cutaneous inflammation.

Ryan B Rountree1, Cynthia R Willis, Huyen Dinh

  • 1Department of Oncology, Amgen, Seattle, Washington, USA.

The Journal of Investigative Dermatology
|July 24, 2009
PubMed
Summary

Receptor-interacting protein 4 (RIP4) is crucial for skin development and differentiation. Epidermal RIP4 regulates skin cell differentiation and inflammation, impacting keratinocyte function.

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Area of Science:

  • Dermatology
  • Molecular Biology
  • Biochemistry

Background:

  • Receptor-interacting protein (RIP) family kinase RIP4 interacts with protein kinase C (PKC) isoforms.
  • RIP4 is implicated in PKC-dependent signaling pathways.
  • RIP4(-/-) mice exhibit embryonic lethality due to severe epidermal differentiation defects.

Purpose of the Study:

  • To investigate the specific role of RIP4 in epidermal differentiation and function.
  • To elucidate the mechanisms underlying RIP4's involvement in skin development.

Main Methods:

  • Generation of transgenic mice with epidermal-specific RIP4 expression (K14-RIP4).
  • Rescue experiments in RIP4(-/-) mice.
  • Analysis of epidermal differentiation in wild-type, mutant, and transgenic mice.
  • Induction of inflammation and skin cancer models using 12-O-tetradecanoylphorbol-13-acetate (TPA) and 7,12-dimethylbenz[a]anthracene (DMBA).

Main Results:

  • Epidermal-specific RIP4 expression rescued the embryonic lethal phenotype of RIP4(-/-) mice, confirming RIP4's autonomous role in epidermal differentiation.
  • Transgenic RIP4 did not rescue epidermal differentiation defects in inhibitor kappaB kinase (IKK)alpha(-/-) or stratifin repeated epilation (Sfn(Er/Er)) mutant mice.
  • Topical TPA treatment of K14-RIP4 mice induced significant neutrophilic inflammation, independent of tumor necrosis factor type 1 receptor (TNFR1/p55).
  • K14-RIP4 mice showed enhanced sensitivity to TPA-induced inflammation but no altered tumor formation frequency in a skin cancer model.

Conclusions:

  • RIP4 plays a critical, autonomous role in epidermal differentiation.
  • RIP4 regulates skin inflammation through PKC-specific signaling pathways.
  • RIP4's function in differentiation and inflammation is distinct from IKKalpha and stratifin pathways.