Kystiini

Kystiini is the Finnish word for cystine. Cystine is a non-essential amino acid, meaning the human body can synthesize it. It is formed from two molecules of cysteine linked together by a disulfide bond. This disulfide bond is crucial for the structural integrity of many proteins, including keratin, which is a key component of hair, skin, and nails.

In biological systems, cystine plays a role in redox homeostasis and is involved in cellular defense mechanisms. It can be found in various foods, particularly those rich in protein, such as meat, poultry, fish, dairy products, and legumes. Dietary intake of cysteine and cystine contributes to the body's overall supply of sulfur-containing amino acids.

Disorders related to cystine metabolism can lead to health problems. For instance, cystinuria is a genetic disorder characterized by an inability of the kidneys to reabsorb cystine, leading to its accumulation in the urine and the formation of cystine kidney stones. Research continues to explore the various roles of cystine in health and disease.