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Identification of Novel CK2 Kinase Substrates Using a Versatile Biochemical Approach
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Multiple subcellular localizations and functions of protein kinase Cδ in liver cancer

Kohji Yamada1, Kiyotsugu Yoshida2

  • 1Department of Biochemistry, The Jikei University School of Medicine, Tokyo 105-8461, Japan.

World Journal of Gastroenterology
|February 3, 2022
PubMed

Insights

Protein kinase Cδ (PKCδ), a key enzyme in liver cancer, exhibits dual roles in cell survival and death. This review highlights its unique extracellular function and diverse localizations, advancing understanding of liver cancer progression.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Oncology

Background:

  • Protein kinase Cδ (PKCδ) is implicated in diverse cellular processes, including cancer development.
  • PKCδ's function is modulated by phosphorylation, cleavage, and subcellular localization, with known roles in the nucleus and cytosol.
  • Its bi-functional regulation of cell death and survival in liver cancer is well-documented.

Purpose of the Study:

  • To review the structural characteristics of PKCδ.
  • To explore the functional diversity of PKCδ based on its subcellular localization, including novel extracellular findings.
  • To enhance understanding of PKCδ's role in liver cancer progression.

Main Methods:

  • Literature review of PKCδ structure and function.
  • Analysis of PKCδ subcellular localization (nucleus, cell surface, extracellular).
  • Discussion of PKCδ's growth factor-like function in liver cancer cells.

Main Results:

  • PKCδ displays diverse subcellular distributions, including a unique extracellular localization in liver cancer.
  • Extracellular PKCδ exhibits growth factor-like functions, influencing liver cancer cell behavior.
  • Functional diversity is linked to PKCδ's specific location within or outside the cell.

Conclusions:

  • PKCδ's localization significantly impacts its function in liver cancer.
  • Extracellular PKCδ represents a novel area of investigation for liver cancer therapeutics.
  • Understanding PKCδ's diverse roles is crucial for deciphering liver cancer progression.
Keywords:
Liver cancerProtein kinase CδSubcellular localizationTumor progressionTumor suppression

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