Ornithine decarboxylase (ODC) Substrate

5-Fluoromethylornithine dihydrochloride (5-FMOrn dihydrochloride) is an orally active and blood-brain barrier-penetrant irreversible inhibitor of ornithine aminotransferase (OAT). 5-Fluoromethylornithine dihydrochloride competes with ornithine at the OAT active site and acts as a poor substrate for ornithine decarboxylase (ODC), competitively reducing ornithine decarboxylation, elevating tissue ornithine, and thereby affecting polyamine metabolism. 5-Fluoromethylornithine dihydrochloride attenuates Thioacetamide (HY-Y0698)-induced acute liver injury-related pathological changes. 5-Fluoromethylornithine dihydrochloride is used in research on acute liver injury and hyperammonemia.

Ornithine ((±)-Ornithine) is a non-essential amino acid. Ornithine is an intermediate in urea cycle and acts as a substrate for these rate limiting enzymes ornithine transcarbomylase, ornithine aminotransferase and ornithine decarboxylase producing citrulline, proline and polyamines, respectively. Ornithine can be used in the research of hyperornithinemia, hyperammonemia, and cancer.