Vitamin B6 has sometimes been referred to as a ‘vitamin without a deficiency’. Non-specific clinical symptoms and functional losses, such as compromised haem synthesis, immunocompetence and electroencephalographic (EEG) abnormalities, have been observed in experimental (depletion) studies, but ‘spontaneous’ cases of clinical vitamin B6 deficiency in man are rare (for review, see Leklem, 1991; B...

The B vitamins are components of one-carbon metabolism (OCM) that contribute to DNA synthesis and methylation. Homocysteine, a by-product of OCM, has been associated with coronary heart disease, stroke and neurological disease. To investigate genetic factors that affect circulating vitamin B6, vitamin B12, folate and homocysteine, a genome-wide association analysis was conducted in the InCHIANT...

In recent years vitamin B6 has become a focus of research describing the compound's critical function in cellular metabolism and stress response. For many years the sole function of vitamin B6 was considered to be that of an enzymatic cofactor. However, recently it became clear that it is also a potent antioxidant that effectively quenches reactive oxygen species and is thus of high importance ...

Excessive amounts of extracellular glutamate in brain are excitotoxic and lead to neuronal death. Glutamate pyrovate transamiase (GPT) and glutamate oxaloacetate transaminase (GOT) catalyze transamination of glutamate to alpha ketoglutarate. Because vitamin B6 is essential for the enzymes activities, this study was undertaken to examine the effect of vitamin B6 on age related changes of this en...

OBJECTIVES We sought to determine if vitamin B6 therapy would reverse linezolid-associated cytopenias and/or peripheral neuropathy. PATIENTS AND METHODS We have recently treated two patients with disseminated Mycobacterium abscessus infections with prolonged (> or =9 month) courses of linezolid. Both patients developed cytopenias related to linezolid, and one patient also developed peripheral...

Patients with non-small cell lung cancer (NSCLC) are routinely treated with cytotoxic agents such as cisplatin. Through a genome-wide siRNA-based screen, we identified vitamin B6 metabolism as a central regulator of cisplatin responses in vitro and in vivo. By aggravating a bioenergetic catastrophe that involves the depletion of intracellular glutathione, vitamin B6 exacerbates cisplatin-mediat...

The majority of vitamin B6 in the body is in skeletal muscle, bound as the cofactor pyridoxal 5'-phosphate to one abundant protein, glycogen phosphorylase. Previous work has established that radiolabelled vitamin B6 can be used as a turnover label for glycogen phosphorylase. In this study, a stable isotope derivative of pyridoxine {dideuterated pyridoxine; 3-hydroxy-4-(hydroxymethyl) -5-[hydrox...

Vitamin B6 has sometimes been referred to as a ‘vitamin without a deficiency’. Non-specific clinical symptoms and functional losses, such as compromised haem synthesis, immunocompetence and electroencephalographic (EEG) abnormalities, have been observed in experimental (depletion) studies, but ‘spontaneous’ cases of clinical vitamin B6 deficiency in man are rare (for review, see Leklem, 1991; B...

BACKGROUND Low dietary intake and low serum concentrations of vitamin B6 and/or folate are associated with increased risk of vascular events, possibly because of their association with inflammation, which plays a crucial role in the pathogenesis of cardiovascular diseases. METHODS Using data from 1320 participants in the population-based InCHIANTI study (586 men and 734 women; median age, 69 ...

Recent studies have shown that vitamin B6 modulates transcriptional activation by the human glucocorticoid receptor in HeLa S3 cells. We have now examined the possibility that vitamin B6 might similarly influence transcriptional activation by the glucocorticoid receptor in other cell types, as well as gene expression mediated by other members of the steroid hormone receptor superfamily. We show...