Pellagra and alcoholism: a biochemical perspective

Area of Science:

• Biochemistry
• Nutritional Science
• Clinical Medicine

Background:

• Pellagra is a disease caused by niacin (nicotinic acid) or tryptophan deficiency.
• Historical outbreaks were linked to diets low in niacin, such as maize and sorghum.
• It can also be induced by drugs, gastrointestinal issues, and alcohol dependence.

Purpose of the Study:

• To review the historical and clinical aspects of pellagra.
• To explore the biochemical mechanisms underlying pellagra and its connection to alcoholism.
• To elucidate the role of niacin, tryptophan, and related metabolites in pellagra pathogenesis.

Main Methods:

• Literature review of historical and clinical data.
• Biochemical analysis of niacin and tryptophan metabolism.
• Examination of drug-induced and alcohol-induced pellagra.

Main Results:

• Niacin deficiency, compounded by B vitamin deficiencies, causes pellagra.
• Skin photosensitivity may involve 5-aminolaevulinic acid (5-ALA) and porphyrins.
• Depression and neurological symptoms are linked to serotonin, 5-ALA, and kynurenic acid deficiencies or excesses.

Conclusions:

• Niacin effectively resolves pellagra symptoms, while vitamin B6 can aggravate them.
• Alcoholism significantly contributes to pellagra by causing malnutrition, vitamin deficiencies, and disrupting tryptophan metabolism.
• Further research into 5-ALA and kynurenic acid's roles in pellagra is warranted.