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  • MART-10, a novel vitamin D analog, inhibits head and neck squamous carcinoma cells growth through cell cycle arrest at G0/G1 with upregulation of p21 and p27 and downregulation of telomerase.

MART-10, a novel vitamin D analog, inhibits head and neck squamous carcinoma cells growth through cell cycle arrest at G0/G1 with upregulation of p21 and p27 and downregulation of telomerase.

The Journal of steroid biochemistry and molecular biology (2013-09-21)
Kun-Chun Chiang, Chun-Nan Yeh, Jun-Te Hsu, Li-Wei Chen, Sheng-Fong Kuo, Chi-Chin Sun, Cheng-Cheng Huang, Jong-Hwei S Pang, John N Flanagan, Masashi Takano, Atsushi Kittaka, Horng-Heng Juang, Shih-Wei Yang, Tai C Chen
ABSTRACT

For the head and neck squamous cell carcinoma (HNSCC), surgery in combination with radiation therapy is the current standard treatment. However, the complex anatomy and important functions over the head and neck region often make HNSCC patients with severe comorbidities. Even after aggressive treatment, the 5year survival for HNSCC patients is only around 61%. Thus, new therapeutic regimens against HNSCC are urgently needed. 1α,25-Dihydroxyvitamin D3 [1α,25(OH)2D3] is a potent anti-tumor agent in a variety of pre-clinical studies, but its clinical application is impeded by hypercalcemic side effect. A new class of less-calcemic 1α,25(OH)2D3 analog, MART-10 (19-nor-2α-(3-hydroxypropyl)- 1α,25-Dihydroxyvitamin D3), has been shown to be much more potent than 1α,25(OH)2D3 in inhibiting cancer cell growth in vitro and in vivo without inducing hypercalcemia. In this study, we compared the antiproliferative activity of MART-10 with 1α,25(OH)2D3 and the mechanism responsible for the inhibition in FaDu and SCC-25 squamous carcinoma cells. Our results demonstrate that MART-10 is more potent than 1α,25(OH)2D3 in suppressing FaDu and SCC-25 cell growth through greater cell cycle arrest at G0/G1, accompanied by a greater downregulation of ki-67 expression and upregulation of p21 and p27. We also showed that telomerase expression in SCC-25 was suppressed to a greater extent by MART-10 than by 1α,25(OH)2D3. Thus, given the previously-proven in vivo antitumor effect and safety of MART-10 and bleak background of HNSCC, based on our current result, we concluded that MART-10 has a potential as a chemo-preventive and - therapeutic agent to treat HNSCC.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Cholecalciferol, ≥98% (HPLC)
Sigma-Aldrich
Cholecalciferol, analytical standard
Sigma-Aldrich
Cholecalciferol, meets USP testing specifications
Supelco
Cholecalciferol (D3), analytical standard
Cholecalciferol, European Pharmacopoeia (EP) Reference Standard
Cholecalciferol for system suitability, European Pharmacopoeia (EP) Reference Standard
Supelco
Cholecalciferol (Vitamin D3), Pharmaceutical Secondary Standard; Certified Reference Material