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Near-infrared fluorescence spectroscopy detects Alzheimer's disease in vitro.

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By Hanlon EB, Itzkan I, Dasari RR, Feld MS, Ferrante • www.ProHealth.com • August 1, 1999


The purpose of this study was to investigate whether near-infrared (NIR) fluorescence spectroscopy could be used to detect Alzheimer's disease (AD) by brain tissue autofluorescence. Unfixed temporal cortex specimens from AD cases and age-matched, non-AD controls were frozen at autopsy and then thawed just prior to spectral measurement.

Spectra of intrinsic tissue fluorescence induced by 647 nm light were recorded from 650 to 850 nm. We used principal component analysis of the tissue spectra from 17 AD cases and 5 non-AD control cases in a calibration study to establish a diagnostic algorithm. Retrospectively applied to the calibration set, the algorithm correctly classified 23 of 24 specimens. In a prospective study of 19 specimens from 5 AD brains and 2 non-AD control brains, 3 of the 4 control specimens and all AD specimens were correctly diagnosed. Both the excitation light used and the measured brain tissue autofluorescence are at NIR wavelengths that can propagate through skull and overlying tissue.

Therefore, our results demonstrate an optical spectroscopic technique that carries direct molecular level information about disease. This is the first step toward a clinical tool that has the potential to be applied to the noninvasive diagnosis of AD in living patients.

Source: Photochem Photobiol 1999 Aug;70(2):236-42
PMID: 10461462, UI: 99390563

(George R. Harrison Spectroscopy Laboratory, Massachusetts Institute of Technology, Cambridge 02139, USA. ebhanlon@mit.edu )




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