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Ritchie CW, Bush AI, Mackinnon A, Macfarlane S, Mastwyk M, MacGregor L, Kiers L, Cherny R, Li QX, Tammer A, Carrington D, Mavros C, Volitakis I, Xilinas M, Ames D, Davis S, Beyreuther K, Tanzi RE, Masters CL.
Metal-protein attenuation with iodochlorhydroxyquin (clioquinol) targeting Abeta amyloid deposition and toxicity in Alzheimer disease: a pilot phase 2 clinical trial. Arch Neurol.
2003 Dec;60(12):1685-91.
PubMed Abstract, View on AlzSWAN
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Comments on Paper and Primary News |
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Primary News: Pilot Study Suggests Clioquinol Benefits AD Patients
Comment by: Mary Reid
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Submitted 4 January 2004
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Posted 5 January 2004
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I would like to ask Dr. Bush whether there is any evidence that clioquinol may inhibit SOD1 activity?
Lee et al.(1) find that the neuronal adaptor protein X11α reduces Aβ levels. McLoughlin et al.(2) find that X11α interacts with the copper chaperone for SOD1 to inhibit to SOD1 activation.
Were clioquinol to inhibit SOD1, would it then enable X11α to have a more active role in Aβ reduction?
Does the fact that thiamine inhibits SOD1 as reported by Lee et al.(3) explain the similarities in the pathology of thiamine deficiency and AD?
References:
(1) Lee JH, Lau KF, Perkinton MS, Standen CL, Shemilt SJ, Mercken L, Cooper JD, McLoughlin DM, Miller CC. The neuronal adaptor protein X11alpha reduces Abeta levels in the brains of Alzheimer's APPswe Tg2576 transgenic mice. J Biol Chem. 2003 Nov 21;278(47):47025-9. Epub 2003 Sep 11. Abstract
(2) McLoughlin DM, Standen CL, Lau KF, Ackerley S, Bartnikas TP, Gitlin JD, Miller CC. The neuronal adaptor protein X11alpha interacts with the copper...
Read more
I would like to ask Dr. Bush whether there is any evidence that clioquinol may inhibit SOD1 activity?
Lee et al.(1) find that the neuronal adaptor protein X11α reduces Aβ levels. McLoughlin et al.(2) find that X11α interacts with the copper chaperone for SOD1 to inhibit to SOD1 activation.
Were clioquinol to inhibit SOD1, would it then enable X11α to have a more active role in Aβ reduction?
Does the fact that thiamine inhibits SOD1 as reported by Lee et al.(3) explain the similarities in the pathology of thiamine deficiency and AD?
References:
(1) Lee JH, Lau KF, Perkinton MS, Standen CL, Shemilt SJ, Mercken L, Cooper JD, McLoughlin DM, Miller CC. The neuronal adaptor protein X11alpha reduces Abeta levels in the brains of Alzheimer's APPswe Tg2576 transgenic mice. J Biol Chem. 2003 Nov 21;278(47):47025-9. Epub 2003 Sep 11. Abstract
(2) McLoughlin DM, Standen CL, Lau KF, Ackerley S, Bartnikas TP, Gitlin JD, Miller CC. The neuronal adaptor protein X11alpha interacts with the copper chaperone for SOD1 and regulates SOD1 activity. J Biol Chem. 2001 Mar 23;276(12):9303-7. Epub 2000 Dec 13.
Abstract
(3) Lee J, Kwon ES, Kim DW, Cha J, Roe JH. Regulation and the role of Cu,Zn-containing superoxide dismutase in cell cycle progression of Schizosaccharomyces pombe. Biochem Biophys Res Commun. 2002 Oct 4;297(4):854-62.
Abstract
 View all comments by Mary Reid |
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Primary News: Pilot Study Suggests Clioquinol Benefits AD Patients
Comment by: Leon Thal
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Submitted 8 January 2004
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Posted 8 January 2004
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This study is interesting and provocative. Having said that:
1. the sample size is very small;
2. the main effect on the ADAS-cog was nonsignificant;
3. the effect in the group with more severe AD may be driven by only a few subjects
since the group had only about eight subjects in the clioquinol and eight in the placebo group;
4. why plasma Aβ levels rose in the placebo group is mystifying;
5. studies of acetylcholinesterase inhibitors and memantine all used substantially larger sample sizes. However, these were funded by pharmaceutical companies, not a small biotech company such as Prana;
6. clioquinol is not benign—one person (of 16 exposed) developed impaired color vision.
In sum, these data warrant a larger study.
View all comments by Leon Thal |
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