Vitamin D and cancer.

Area of Science:

• Endocrinology
• Oncology
• Dermatology

Background:

• Vitamin D, a prohormone synthesized from sunlight exposure, plays a crucial role in cellular regulation.
• Experimental evidence indicates vitamin D's potential anticancer properties, including regulating cellular proliferation, differentiation, and angiogenesis.
• The hormonal form, 1,25-dihydroxyvitamin D (calcitriol), is key, acting via specific vitamin D receptors (VDR) found in various cells, including cancer cells.

Purpose of the Study:

• To explore the anticancer properties of vitamin D and its analogues.
• To investigate the role of vitamin D in regulating cellular processes relevant to cancer.
• To examine the association between sunlight exposure, vitamin D levels, and cancer risk.

Main Methods:

• Review of experimental evidence on vitamin D's cellular effects.
• Analysis of epidemiological studies correlating sunlight exposure with cancer mortality.
• Evaluation of in vitro and in vivo studies on vitamin D analogues in prostate cancer models.

Main Results:

• 1,25-dihydroxyvitamin D (calcitriol) regulates over 60 genes, exerting anti-proliferative, pro-differentiating, and anti-metastatic effects.
• Inverse correlation observed between sun exposure (UV-B) and non-skin cancer mortality.
• Studies suggest sunlight and vitamin D may protect against prostate, colon, breast, and ovarian cancers.
• Paricalcitol, a calcitriol analogue, demonstrated efficacy comparable to calcitriol in prostate cancer models.

Conclusions:

• Vitamin D, particularly its active form calcitriol, possesses significant anticancer properties mediated through VDR signaling.
• Sunlight exposure and adequate vitamin D levels are associated with reduced cancer risk, especially for non-skin cancers.
• Vitamin D analogues show promise as therapeutic agents in cancer treatment, particularly for prostate cancer.