The Effects of Sapropterin Dihydrochloride Supplementation on in Vivo Redox Status in Patients With Classical PKU

NCT ID: NCT01650909

Last Updated: 2014-04-23

Basic Information

• Recruitment Status: WITHDRAWN
• Study Classification: OBSERVATIONAL
• Study Start Date: 2012-07-31

Brief Summary

This study is an independent sub-study of the protocol titled PKU-016: A double-blind, placebo-controlled, randomized study to evaluate the safety and therapeutic effects of sapropterin dihydrochloride on neuro-psychiatric symptoms in subjects with phenylketonuria (PKU ASCEND).

The primary objective of this study is to determine oxidative stress in patients with classical phenylketonuria (PKU) enrolled in PKU-016, using a brain scan (called an HMPAO SPECT) at baseline and 26 weeks, and blood redox biomarkers.

Conditions

Classical Phenylketonuria(PKU)

Study Design

• Study Time Perspective: PROSPECTIVE

Eligibility Criteria

Inclusion Criteria

• ≥ 8 years of age
• Confirmed diagnosis of PKU
• Willing to continue current diet (typical diet for the 3 months prior to study entry)unchanged while participating in the study
• Willing and able to provide written, signed informed consent or in the case of subjects under the age of 18, provide written assent (if required) and written informed consent by a legally authorized representative after the nature of the study has been explained, and prior to any research-related procedures
• Sexually active subjects must be willing to use an acceptable method of contraception while participating in the study and for at least 30 days following the last dose of sapropterin dihydrochloride
• Females of childbearing potential must have a negative pregnancy test at screening and be willing to have additional pregnancy tests during the study. Females considered not of childbearing potential include those who have been in menopause at least 2 years, or had tubal ligation at least 1 year prior to screening, or have had total hysterectomy
• Willing and able to comply with all study procedures

Exclusion Criteria

• Has known hypersensitivity to sapropterin dihydrochloride or its excipients
• Subject breastfeeding at screening or planning to become pregnant (subject or partner) at any time during the study
• Use of any investigational product or investigational medical device within 30 days prior to screening, or requirement for any investigational agent prior to the completion of all scheduled study assessments
• Received sapropterin dihydrochloride within 16 weeks of randomization • Have initiated or adjusted medication for treatment of ADHD, depression, or anxiety ≤ 8 weeks prior to randomization
• Taking medication known to inhibit folate synthesis (eg, methotrexate)
• Any condition requiring treatment with levodopa or any PDE-5 inhibitor
• Concurrent disease or condition that would interfere with study participation, compliance or safety as determined by the Investigator
• Any condition that, in the view of the Investigator, places the subject at high risk of poor treatment compliance or not completing the study

• Minimum Eligible Age: 8 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

BioMarin Pharmaceutical

INDUSTRY

Sponsor Role: collaborator

Stanford University

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Gregory Enns, MD

Role: PRINCIPAL_INVESTIGATOR

Stanford University

References

Atkuri KR, Cowan TM, Kwan T, Ng A, Herzenberg LA, Herzenberg LA, Enns GM. Inherited disorders affecting mitochondrial function are associated with glutathione deficiency and hypocitrullinemia. Proc Natl Acad Sci U S A. 2009 Mar 10;106(10):3941-5. doi: 10.1073/pnas.0813409106. Epub 2009 Feb 17.

Reference Type: BACKGROUND

PMID: 19223582 (View on PubMed)

Christ SE, Huijbregts SC, de Sonneville LM, White DA. Executive function in early-treated phenylketonuria: profile and underlying mechanisms. Mol Genet Metab. 2010;99 Suppl 1:S22-32. doi: 10.1016/j.ymgme.2009.10.007.

Reference Type: BACKGROUND

PMID: 20123466 (View on PubMed)

Fernandes CG, Leipnitz G, Seminotti B, Amaral AU, Zanatta A, Vargas CR, Dutra Filho CS, Wajner M. Experimental evidence that phenylalanine provokes oxidative stress in hippocampus and cerebral cortex of developing rats. Cell Mol Neurobiol. 2010 Mar;30(2):317-26. doi: 10.1007/s10571-009-9455-6. Epub 2009 Sep 23.

Reference Type: BACKGROUND

PMID: 19774456 (View on PubMed)

Jacquier-Sarlin MR, Polla BS, Slosman DO. Oxido-reductive state: the major determinant for cellular retention of technetium-99m-HMPAO. J Nucl Med. 1996 Aug;37(8):1413-6.

Reference Type: BACKGROUND

PMID: 8708786 (View on PubMed)

Sasaki T, Senda M. Technetium-99m-meso-HMPAO as a potential agent to image cerebral glutathione content. J Nucl Med. 1997 Jul;38(7):1125-9.

Reference Type: BACKGROUND

PMID: 9225804 (View on PubMed)

Sirtori LR, Dutra-Filho CS, Fitarelli D, Sitta A, Haeser A, Barschak AG, Wajner M, Coelho DM, Llesuy S, Bello-Klein A, Giugliani R, Deon M, Vargas CR. Oxidative stress in patients with phenylketonuria. Biochim Biophys Acta. 2005 Apr 15;1740(1):68-73. doi: 10.1016/j.bbadis.2005.02.005. Epub 2005 Feb 25.

Reference Type: BACKGROUND

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Sitta A, Barschak AG, Deon M, Terroso T, Pires R, Giugliani R, Dutra-Filho CS, Wajner M, Vargas CR. Investigation of oxidative stress parameters in treated phenylketonuric patients. Metab Brain Dis. 2006 Dec;21(4):287-96. doi: 10.1007/s11011-006-9035-0. Epub 2006 Dec 5.

Reference Type: BACKGROUND

PMID: 17146735 (View on PubMed)

Sitta A, Manfredini V, Biasi L, Tremea R, Schwartz IV, Wajner M, Vargas CR. Evidence that DNA damage is associated to phenylalanine blood levels in leukocytes from phenylketonuric patients. Mutat Res. 2009 Sep-Oct;679(1-2):13-6. doi: 10.1016/j.mrgentox.2009.07.013. Epub 2009 Aug 7.

Reference Type: BACKGROUND

PMID: 19665577 (View on PubMed)

Other Identifiers

Redox Sub-study of PKU-016

Identifier Type: -

Identifier Source: org_study_id