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Characterization of In Vitro Differentiation of Human Primary Keratinocytes by RNA-Seq Analysis
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Protein kinase D1 deficiency promotes differentiation in epidermal keratinocytes

Vivek Choudhary1, Lawrence O Olala2, Ismail Kaddour-Djebbar2

  • 1Charlie Norwood VA Medical Center, Augusta, GA 30904, USA; Department of Physiology, Medical College of Georgia at Georgia Regents University, Augusta, GA 30912, USA; Section of Dermatology, Department of Medicine, Medical College of Georgia at Georgia Regents University, Augusta, GA 30912, USA.

Journal of Dermatological Science
|December 3, 2014
PubMed
Abstract

Insights

Protein kinase D1 (PKD1) deficiency in mouse keratinocytes promotes differentiation and inhibits proliferation. This study reveals PKD1 as a key regulator of epidermal homeostasis, impacting skin cell function.

Area of Science:

  • Dermatology
  • Molecular Biology
  • Cell Biology

Background:

  • Protein kinase D (PKD or PKD1) is a serine/threonine kinase involved in cellular processes.
  • The specific role of PKD1 in skin keratinocyte proliferation and differentiation remains largely unexplored.
  • Maintaining the balance between keratinocyte proliferation and differentiation is crucial for normal skin function.

Purpose of the Study:

  • To investigate the impact of PKD1 deficiency on the proliferation and differentiation of epidermal keratinocytes.
  • To elucidate the role of PKD1 in regulating skin cell behavior.

Main Methods:

  • Utilized a floxed PKD1 mouse model and Cre-recombinase-expressing adenovirus for in vitro gene knockdown.
  • Assessed proliferation and differentiation using qRT-PCR, Western blot, transglutaminase activity assays, [3H]thymidine incorporation, and cell cycle analysis.

Main Results:

  • PKD1 deficiency significantly increased the expression of differentiation markers (loricrin, involucrin, keratin 10) and transglutaminase activity.
  • PKD1-deficient keratinocytes showed decreased proliferation but no change in stem cell marker expression.
  • Successful knockdown of PKD1 mRNA and protein levels was confirmed.

Conclusions:

  • PKD1 acts as an anti-differentiative and pro-proliferative signal in mouse keratinocytes.
  • Cre-recombinase-mediated knockdown is an effective method for studying PKD1 function in skin.
  • PKD1 plays a significant role in regulating epidermal homeostasis.
Keywords:
DifferentiationKeratinocyteProliferationProtein kinase DTransglutaminase

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