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논문 기본 정보

자료유형
학술저널
저자정보
Shintaku, Haruo (Department of Pediatrics, Osaka City University Graduate School of Medicine)
저널정보
대한유전성대사질환학회 대한유전성대사질환학회지 대한유전성대사질환학회지 제15권 제2호
발행연도
2015.1
수록면
55 - 58 (4page)

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Tetrahydrobiopterin ($BH_4$) can normalize blood phenylalanine (Phe) levels in $BH_4$ deficiency, but typically not in phenylketonuria (PKU). In 1999, Kure et al. reported that some PKU patients showed decreased blood Phe levels after $BH_4$ loading, and thereafter, those PKU patients were identified by neonatal PKU screening. A natural cofactor for phenylalanine hydroxylase (PAH) is a 6R-isomer of $BH_4$, which is first synthesized in Japan as Sapropterin dihydrochloride (Biopten$^{(R)}$) in 1982. In Japan, Biopten$^{(R)}$ is first approved for the treatment of $BH_4$ deficiency in 1992, and then for $BH_4$-responsive PAH deficiency (BPKU) in 2008. The discovery of BPKU has vast clinical implications. After Biopten$^{(R)}$ (Kuvan$^{(R)}$) is available for the treatment of BPKU, the QOL of both patients and their families were improved very much, since the serum phenylalanine levels were controlled within 4 mg/dL by $BH_4$ mono-therapy with a normal diet or $BH_4$ combined use of mild phenylalanine-restricted diet. Biopten$^{(R)}$ therapy in patients with BPKU is highly efficacious (70%) at maintaining serum Phe levels within recommended control range and provides excellent safety at least average use period of 10 years (range, 1-17 years) with no unwarranted side effects in Japan. In addition it has been confirmed that sapropterin therapy initiated before 4 years of age was very effective to maintain plasma Phe levels within the favorable range and was safe in Japanese patients with BPKU.

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