Taurine

Taurine is a beta-amino acid that, while classically considered "non-essential" in many mammalian species, is absolutely **essential for cats** and conditionally essential for certain dog breeds. - **Feline Health**: Cats cannot synthesize adequate taurine due to low cysteinesulfinic acid decarboxylase (CSAD) activity and their obligate use of taurine for bile acid conjugation. Deficiency leads to **feline central retinal degeneration (FCRD)** and **dilated cardiomyopathy (DCM)**. - **Canine Health**: Certain breeds (e.g., American Cocker Spaniels, Golden Retrievers, Newfoundlands, Dalmatians, English Bulldogs) are predisposed to taurine-deficient DCM. - **Other Uses**: Used adjunctively for hepatic lipidosis in cats (as it is hepatoprotective and required for bile conjugation) and as a complementary therapy for seizure disorders due to its neuromodulatory effects.

กลไกการออกฤทธิ์: - **Synthesis Pathway**: Synthesized *in vivo* from **methionine** and **cysteine** via the enzyme **cysteinesulfinic acid decarboxylase (CSAD)** (a process requiring **Vitamin B6**). - **Bile Acid Conjugation**: Crucial for fat digestion. Cats use taurine almost exclusively for this process, leading to obligate loss in feces. - **Cardiac Function**: Modulates **calcium flux** across cell membranes → provides positive inotropic activity without altering the resting membrane potential, and modulates ionic currents. - **Neuromodulation**: Stabilizes neuronal membranes and exerts a **GABA-like inhibitory effect** in the CNS, which may help raise the seizure threshold and reduce seizure activity. - **Platelet Function**: Reduces platelet aggregation via calcium modulation.

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