Mapping of cellular iron using hyperspectral fluorescence imaging in a cellular model of Parkinson’s disease

Eung Seok Oh; Chaejeong Heo; Ji Seon Kim; Young Hee Lee; Jong Min Kim

doi:10.1117/12.2020750

20 May 2013 Mapping of cellular iron using hyperspectral fluorescence imaging in a cellular model of Parkinson’s disease

Eung Seok Oh, Chaejeong Heo, Ji Seon Kim, Young Hee Lee, Jong Min Kim

Author Affiliations +

Proceedings Volume 8879, Nano-Bio Sensing, Imaging, and Spectroscopy; 88790P (2013) https://doi.org/10.1117/12.2020750
Event: Nano-Bio Sensing, Imaging and Spectroscopy, 2013, Jeju, Korea, Republic of

Abstract

Parkinson’s disease (PD) is characterized by progressive dopaminergic cell loss in the substantianigra (SN) and elevated iron levels demonstrated by autopsy and with 7-Tesla magnetic resonance imaging. Direct visualization of iron with live imaging techniques has not yet been successful. The aim of this study is to visualize and quantify the distribution of cellular iron using an intrinsic iron hyperspectral fluorescence signal. The 1-methyl-4-phenylpyridinium (MPP+)-induced cellular model of PD was established in SHSY5Y cells. The cells were exposed to iron by treatment with ferric ammonium citrate (FAC, 100 μM) for up to 6 hours. The hyperspectral fluorescence imaging signal of iron was examined usinga high- resolution dark-field optical microscope system with signal absorption for the visible/ near infrared (VNIR) spectral range. The 6-hour group showed heavy cellular iron deposition compared with the small amount of iron accumulation in the 1-hour group. The cellular iron was dispersed in a small, particulate form, whereas extracellular iron was detected in an aggregated form. In addition, iron particles were found to be concentrated on the cell membrane/edge of shrunken cells. The cellular iron accumulation readily occurred in MPP⁺-induced cells, which is consistent with previous studies demonstrating elevated iron levels in the SN in PD. This direct iron imaging methodology could be applied to analyze the physiological role of iron in PD, and its application might be expanded to various neurological disorders involving other metals, such as copper, manganese or zinc.

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Eung Seok Oh, Chaejeong Heo, Ji Seon Kim, Young Hee Lee, and Jong Min Kim "Mapping of cellular iron using hyperspectral fluorescence imaging in a cellular model of Parkinson’s disease", Proc. SPIE 8879, Nano-Bio Sensing, Imaging, and Spectroscopy, 88790P (20 May 2013); https://doi.org/10.1117/12.2020750

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KEYWORDS

Iron

Imaging systems

Luminescence

Hyperspectral imaging

Absorption

Glasses

Metals

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