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Toll like receptors TLR1/2, TLR6 and MUC5B as binding interaction partners with cytostatic proline rich polypeptide 1

Karina Galoian1, Silva Abrahamyan2, Gor Chailyan2

  • 1Department of Orthopedic Surgery, University of Miami Miller School of Medicine, Miami, FL, USA.

International Journal of Oncology
|November 16, 2017
PubMed

Insights

Proline rich polypeptide 1 (PRP-1) binds to toll like receptors (TLR1/2, TLR6) and mucin MUC5B in chondrosarcoma. These receptors, normally downregulated, suppress tumor growth when upregulated by PRP-1.

Area of Science:

  • Oncology
  • Immunology
  • Molecular Biology

Background:

  • Metastatic chondrosarcoma lacks effective treatments.
  • Proline rich polypeptide 1 (PRP-1) shows antitumorigenic effects in chondrosarcoma.
  • Understanding PRP-1's mechanism requires identifying its cellular receptors.

Purpose of the Study:

  • To identify the specific receptors for the cytostatic proline rich polypeptide 1 (PRP-1) in human chondrosarcoma.
  • To investigate the role of these receptors in chondrosarcoma progression and response to PRP-1 therapy.

Main Methods:

  • Ligand-receptor capture technology to identify MUC5B as a PRP-1 receptor.
  • Western blot analysis to detect TLR1/2 and TLR6 interaction with PRP-1.
  • Immunocytochemistry to confirm receptor localization.
  • Assessing receptor expression levels in chondrosarcoma cells with and without PRP-1 treatment.

Main Results:

  • PRP-1 interacts with toll like receptors (TLR1/2, TLR6) and mucin MUC5B.
  • MUC5B was identified as a direct PRP-1 receptor in JJ012 chondrosarcoma cells.
  • TLR1/2 and TLR6 were confirmed as binding partners for PRP-1.
  • PRP-1 receptors (TLR1/2, TLR6, MUC5B) are downregulated in chondrosarcoma but upregulated by PRP-1.
  • Receptor localization was predominantly nuclear.

Conclusions:

  • PRP-1 utilizes TLR1/2, TLR6, and MUC5B as receptors in chondrosarcoma.
  • These identified receptors exhibit tumor suppressive functions in this context.
  • PRP-1's therapeutic potential is linked to its ability to upregulate these tumor-suppressive receptors.

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