1α,25(OH)₂D₃ inhibits FGF-2 release from oral squamous cell carcinoma cells through down-regulation of HBp17/FGFBP-1

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Published on Friday, 16 August 2019

Abstract

Heparin-binding protein 17/fibroblast growth factor binding protein-1 (HBp17/FGFBP-1, GenBank accession no. NP-005121) is prominent for its role as the chaperone for fibroblast growth factor-2 (FGF-2), which plays a crucial role in angiogenesis as well as promoting tumor growth. HBp17/FGFBP-1 has been proposed as a candidate biomarker for a number of cancers since it is frequently found to be elevated in many cancer types including in the tissue and cell lines of oral squamous cell carcinomas (OSCC).

Previously, we reported that 1α,25(OH)2D3 suppressed the HBp17/FGFBP-1 expression in OSCC by inhibiting nuclear factor-kappaB (NF-κB) expression via vitamin D3 receptor (VDR).

In this paper, to further characterize the inhibitory effect of 1α,25(OH)2D3 on HBp17/FGFBP-1, we examined the cellular localization of HBp17/FGFBP-1 protein and FGF-2 protein in the UE OSCC cell line.

We found that the treatment of OSCC cells with 40-nM 1α,25(OH)2D3 suppressed HBp17/FGFBP-1 expression both in the nucleus and cytosol and reduced FGF-2 release into the culture medium. The expression of HBp17/FGFBP-1 and FGF-2 was analyzed by immunofluorescence and enzyme-linked immunosorbent assay (ELISA).

In summary, the ability of 1α,25(OH)2D3 to suppress the expression of HBp17/FGFBP-1 and FGF-2 strongly suggests a therapeutic potential as a molecular-targeted anticancer drug for FGF-dependent cancers.

 

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- Official Web Site: The Di Bella Method;

- The Di Bella Method (A Fixed Part - Dihydrotachysterol, Alfacalcidol, synthetic Vitamin D3);

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- The Di Bella Method (A Variable Part - Omega 3 Essential/Unsaturated Fatty Acids. From 1.5 grams up to 3.0 grams per day orally);

- The Di Bella Method (A Fixed Part - Somatostatin, Octreotide, Sandostatin LAR, analogues and/or derivatives);

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- The Di Bella Method DBM improved survival objective response and performance status in a retrospective observational clinical study on 23 tumours of the head and neck;

- Recurrent Glioblastoma Multiforme (grade IV – WHO 2007): a case of complete objective response achieved by means of the concomitant administration of Somatostatin and Octreotide – Retinoids – Vitamin E – Vitamin D3 – Vitamin C – Melatonin – D2 R agonists (Di Bella Method – DBM) associated with Temozolomide;

- A case of advanced Multiple Myeloma treated with Di Bella Method (DBM) into total remission for 13 years;

- Neuroblastoma: Complete objective response to biological treatment;

- Oesophageal squamocellular carcinoma: a complete and objective response.