Glycoprotein Non-Metastatic Melanoma Protein B in Cancer Biology

Summary

Glycoprotein non-metastatic melanoma protein B (GPNMB) is a type I transmembrane glycoprotein that is aberrantly overexpressed in a range of malignancies, including breast, melanoma, prostate and lung cancers. Within the tumour microenvironment, GPNMB orchestrates key processes governing tumour progression such as cell adhesion, migration, invasion and immune modulation. Proteolytic shedding of its ectodomain by metalloproteases liberates a soluble fragment that acts in a paracrine manner to recruit endothelial cells and promote angiogenesis. Through interactions with receptors such as integrins and CD44, GPNMB engages downstream signalling cascades—including PI3K/Akt and MEK/ERK—enhancing tumour cell survival, proliferation and metastatic potential. Clinically, elevated GPNMB expression is associated with poor prognosis and resistance to conventional therapies. Consequently, GPNMB has emerged both as a prognostic biomarker and as a promising target for novel interventions, notably antibody-based and bispecific T-cell engaging immunotherapies that exploit its cell-surface localisation to direct tumour cell killing.

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Glycoprotein Non-Metastatic Melanoma Protein B in Cancer Biology publication trend

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Technical terms

Ectodomain: The extracellular segment of a transmembrane protein that can be proteolytically cleaved and released to act as a signalling molecule.

Angiogenesis: The process by which new blood vessels form from existing vasculature, essential for supplying nutrients and oxygen to growing tumours.

Matrix metalloproteinase (MMP): A family of zinc-dependent endopeptidases that degrade extracellular matrix components, facilitating tissue remodelling, invasion and metastasis.

Bispecific T-cell engager (BiTE): A recombinant construct designed to bind simultaneously to a tumour-associated antigen and to CD3 on T cells, thereby redirecting cytotoxic T cells to target and kill cancer cells.

References

  1. ADAM10 Releases a Soluble Form of the GPNMB/Osteoactivin Extracellular Domain with Angiogenic Properties. PLOS ONE (2010).
  2. Osteoactivin (GPNMB) ectodomain protein promotes growth and invasive behavior of human lung cancer cells. Oncotarget (2016).
  3. Human Antibody VH Domains Targeting GPNMB and VCAM‑1 as Candidate Therapeutics for Cancers. Molecular Pharmaceutics (2023).
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