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December 03, 2013; 81 (23) WriteClick: Editor's Choice

Nonmelanoma skin cancer is associated with reduced Alzheimer disease risk

Friedrich P. Thinnes
First published December 2, 2013, DOI: https://doi.org/10.1212/01.wnl.0000436924.94798.59
Friedrich P. Thinnes
Göttingen, Germany
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Nonmelanoma skin cancer is associated with reduced Alzheimer disease risk
Friedrich P. Thinnes
Neurology Dec 2013, 81 (23) 2056; DOI: 10.1212/01.wnl.0000436924.94798.59

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Editors' Note: Friedrich Thinnes proposes an interesting hypothesis for the association between skin cancer and reduced Alzheimer disease risk. Willey critiques the statistical methods in the study by Martínez-Sánchez et al. on statins and stroke severity. However, both parties agree that no definite conclusion can be made before a clinical trial on acute treatment of stroke patients with statins is completed. Martin discusses his experience with trigger factors in migraine and points out to Hougaard et al. that triggers have been studied in the past, contrary to the authors' claim. —Chafic Karam, MD, and Robert C. Griggs, MD

I propose a biologically based hypothesis for the association between skin cancer and reduced Alzheimer disease (AD) risk.1 Amyloid Aβ peptides, cut from the amyloid precursor protein of neurons, are assumed to induce brain-wide neuronal apoptosis via opening plasma lemma-standing type 1 voltage-dependent anion channels (VDAC). This process results in AD whenever critical brain regions are affected.2,–,4 Either reaction partner carries one or several GxxxG motifs. Furthermore, data indicate that amyloid Aβ peptides can be extruded from the brain by ABC transporters at the blood–brain barrier and cancerous transformations accompany changes in the expression level or the functionality of multidrug resistance modulators that then disturb chemotherapy.5 However, enhanced extrusion of apoptogenic amyloid A by raised ABC transporter activities of cancer survivors might diminish or even abolish intrabrain apoptotic effect. These findings, along with other data,5 may explain why cancer survivors have a lower risk of AD. Finally, the VDAC/amyloid interaction model of AD pathogenesis could explain the reverse relationship of AD and cancer.5

  • © 2013 American Academy of Neurology

References

  1. 1.↵
    1. White RS,
    2. Lipton RB,
    3. Hall CB,
    4. Steinerman JR
    . Nonmelanoma skin cancer is associated with reduced Alzheimer disease risk. Neurology 2013;80:1966–1972.
    OpenUrlAbstract/FREE Full Text
  2. 2.↵
    1. Thinnes FP
    . Amyloid A-beta cut from APP by beta secretase BACE1 and gamma secretase induces apoptosis via opening type-1 porin/VDAC in cell membranes of hypometabolic cells-A basic model for the induction of apoptosis. Mol Genet Metab 2010;101:301–303.
    OpenUrlPubMed
  3. 3.↵
    1. Thinnes FP
    . Apoptogenic interactions of plasmalemmal type-1 VDAC and A-beta peptides via GxxxG motifs induce Alzheimer's disease: a basic model of apoptosis. Wien Med Wochenschr 2011;161:274–276.
    OpenUrlCrossRefPubMed
  4. 4.↵
    1. Mattson MP,
    2. Begley JG,
    3. Mark RJ,
    4. Furukawa K
    . Abeta 25-35 induces rapid lysis of red blood cells: contrast with Abeta1-42 and examination of underlying mechanisms. Brain Res 1997;771:147–153.
    OpenUrlCrossRefPubMed
  5. 5.↵
    1. Thinnes FP
    . New findings concerning vertebrate porin II on the relevance of glycine motifs of type-1 VDAC. Mol Genet Metab 2013;108:212–224.
    OpenUrlPubMed
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