Volume 58, Issue 1 pp. 31-40
Original Article

Possibility for neurogenesis in substantia nigra of parkinsonian brain

Kenji Yoshimi PhD

Kenji Yoshimi PhD

Research Institute for Diseases of Old Ages, Juntendo University, Bunkyo-ku, Tokyo, Japan

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Yong-Ri Ren MD

Yong-Ri Ren MD

Department of Neurology, Juntendo University School of Medicine, Bunkyo-ku, Tokyo, Japan

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Tatsunori Seki PhD

Tatsunori Seki PhD

Research Institute for Diseases of Old Ages, Juntendo University, Bunkyo-ku, Tokyo, Japan

Department of Anatomy, Juntendo University School of Medicine, Bunkyo-ku, Tokyo, Japan

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Masanori Yamada PhD

Masanori Yamada PhD

Research Institute for Diseases of Old Ages, Juntendo University, Bunkyo-ku, Tokyo, Japan

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Hideki Ooizumi MD

Hideki Ooizumi MD

Department of Neurology, Juntendo University School of Medicine, Bunkyo-ku, Tokyo, Japan

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Masafumi Onodera MD, PhD

Masafumi Onodera MD, PhD

Department of Hematology, Institute of Clinical Medicine, University of Tsukuba, Tsukuba, Ibaraki, Tokyo, Japan

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Yuko Saito MD, PhD

Yuko Saito MD, PhD

Department of Neuropathology, Tokyo Metropolitan Institute of Gerontology, Itabashi-ku, Tokyo, Japan

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Shigeo Murayama MD, PhD

Shigeo Murayama MD, PhD

Department of Neuropathology, Tokyo Metropolitan Institute of Gerontology, Itabashi-ku, Tokyo, Japan

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Hideyuki Okano MD, PhD

Hideyuki Okano MD, PhD

Department of Physiology, Keio University School of Medicine, Shinjuku, Tokyo, Japan

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Yoshikuni Mizuno MD, PhD

Yoshikuni Mizuno MD, PhD

Research Institute for Diseases of Old Ages, Juntendo University, Bunkyo-ku, Tokyo, Japan

Department of Neurology, Juntendo University School of Medicine, Bunkyo-ku, Tokyo, Japan

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Hideki Mochizuki MD, PhD

Corresponding Author

Hideki Mochizuki MD, PhD

Research Institute for Diseases of Old Ages, Juntendo University, Bunkyo-ku, Tokyo, Japan

Department of Neurology, Juntendo University School of Medicine, Bunkyo-ku, Tokyo, Japan

Department of Neurology, Juntendo University School of Medicine, 2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, JapanSearch for more papers by this author
First published: 27 June 2005
Citations: 108

Abstract

Recent studies of enhanced hippocampal neurogenesis by antidepressants suggest enhancement of neurogenesis is a potentially effective therapy in neurodegenerative diseases. In this study, we evaluated nigral neurogenesis in animals and autopsy brains including patients with Parkinson's disease (PD). First, proliferating cells in substantia nigra were labeled with retroviral transduction of green fluorescent protein, which is an efficient method to label neuronal stem cells. Subsequent differentiation of labeled cells was followed; many transduced cells became microglia, but no differentiation into tyrosine hydroxylase–positive neurons was detected at 4 weeks after injection, in both intact rodents and those treated with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine. Second, polysialic acid (PSA)–like immunoreactivity, indicative of newly differentiated neurons, was detected in the substantia nigra of rodent, primate, and human midbrains. A large number of PSA-positive cells were detected in the substantia nigra pars reticulata of some patients with PD. In rats and a macaque monkey, the dopamine-depleted hemispheres showed more PSA staining than the intact side. A small number of tyrosine hydroxylase–positive cells were PSA-positive. Our results suggest enhanced neural reconstruction in PD, which may be important in the design of new therapies against the progression of PD. Ann Neurol 2005

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