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Vitamin D and calcium insufficiency-related chronic diseases: molecular and cellular pathophysiology. Peterlik M, Cross HS. Eur J Clin Nutr. 2009 Dec;63(12):1377-86. Epub 2009 Sep 2. PMID: 19724293 doi:10.1038/ejcn.2009.105 A compromised vitamin D status, characterized by low 25-hydroxyvitamin D (25-(OH)D) serum levels, and a nutritional calcium deficit are widely encountered in European and North American countries, independent of age or gender. Both conditions are linked to the pathogenesis of many degenerative, malignant, inflammatory and metabolic diseases. Studies on tissue-specific expression and activity of vitamin D metabolizing enzymes, 25-(OH)D-1alpha-hydroxylase and 25-(OH)D-24-hydroxylase, and of the extracellular calcium-sensing receptor (CaR) have led to the understanding of how, in non-renal tissues and cellular systems, locally produced 1,25-dihydroxyvitamin D3 (1,25-(OH)2D3) and extracellular Ca2+ act jointly as key regulators of cellular proliferation, differentiation and function. Impairment of cooperative signalling from the 1,25-(OH)2D3-activated vitamin D receptor (VDR) and from the CaR in vitamin D and calcium insufficiency causes cellular dysfunction in many organs and biological systems, and, therefore, increases the risk of diseases, particularly of osteoporosis, colorectal and breast cancer, inflammatory bowel disease, insulin-dependent diabetes mellitus type I, metabolic syndrome, diabetes mellitus type II, hypertension and cardiovascular disease. Understanding the underlying molecular and cellular processes provides a rationale for advocating adequate intake of vitamin D and calcium in all populations, thereby preventing many chronic diseases worldwide.

How to optimize vitamin D supplementation to prevent cancer, based on cellular adaptation and hydroxylase enzymology. Vieth R. Anticancer Res. 2009 Sep;29(9):3675-84. Review. PMID: 19667164

"Summer vs Winter Mode: Explaining AMPK Last year I read an article which made a statement that has not left my mind. The statement went as follows: "You are only good as your mitochondria." In fact, the more a dwell into the details of human metabolism, the more I sense that this is true - especially with the metabolic syndrome. For those who are not familiar with the concept of mitochondria, they are the tiny energy factories within the cells that produce cellular energy through aerobic means (meaning oxygen). Mitochondria utilize oxygen to ultimately produce Adenosine Triphosphate or simply ATP. ATP relays energy by donating a phosphate bond resulting in Adenosine Diphosphate (ADP). Another phosphate release would entail Adenosine Monophosphate or AMP. ATP is one of the main sources of cellular energy in the body

How to optimize vitamin D supplementation to prevent cancer, based on cellular adaptation and hydroxylase enzymology. Vieth R. Anticancer Res. 2009 Sep;29(9):3675-84. Review. PMID: 19667164

How to optimize vitamin D supplementation to prevent cancer, based on cellular adaptation and hydroxylase enzymology. Vieth R. Anticancer Res. 2009 Sep;29(9):3675-84. PMID: 19667164

Schematic diagram of cutaneous production of vitamin D and its metabolism and regulation for calcium homeostasis and cellular growth - Figure 3 from the study Holick MF. Sunlight and vitamin D for bone health and prevention of autoimmune diseases, can

Vitamin D and cognitive performance in adults: a systematic review. Annweiler C, Allali G, Allain P, Bridenbaugh S, Schott AM, Kressig RW, Beauchet O. Eur J Neurol. 2009 Oct;16(10):1083-9. Epub 2009 Jul 29. PMID: 19659751 DOI: 10.1111/j.1468-1331.2009.02755.x This systematic review shows that the association between serum 25OHD concentrations and cognitive performance is not yet clearly established. The inconclusive results of the reviewed studies could be due to methodology, types of the cognitive tasks used and/or the cellular mechanisms of vitamin D.

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