Huntingtin localization in brains of normal and Huntington's disease patients

Annals of Neurology - Tập 42 Số 4 - Trang 604-612 - 1997
Ellen Sapp1, Cordula Schwarz2, Kathryn Chase2, Pradeep G. Bhide2, A. B. Young2, John B. Penney2, Jean Paul Vonsattel2, Neil Aronin2, Marian DiFiglia2
1Massachusetts General Hospital - Boston, USA
2Massachusetts General Hospital, Boston, and University of Massachusetts Medical Center, Worcester, MA

Tóm tắt

AbstractThe immunohistochemical localization of huntingtin was examined in the Huntington's disease (HD) brain with an antibody that recognizes the wild‐type and mutant proteins. Neuronal staining was reduced in areas of the HD striatum depleted of medium‐sized neurons; large striatal neurons, which are spared in HD, retained normal levels of huntingtin expression. Neuronal labeling was markedly reduced in both segments of the globus pallidus including in brains with minimal loss of pallidal neurons. In some HD cortical and striatal neurons with normal looking morphology, huntingtin was associated with punctate cytoplasmic granules that at the ultrastructural level resembled the multivesicular body, an organelle involved in retrograde transport and protein degradation. Some immunoreactive processes showed blebbing and segmentation similar to that induced experimentally by hypoxic–ischemic or excitotoxic injury. Huntingtin staining was more concentrated in the perinuclear cytoplasm and reduced or absent in processes of atrophic cortical neurons. Nuclear staining was also evident. Fibers in the subcortical white matter of HD patients had significantly increased huntingtin immunoreactivity compared with those of controls. Results suggest that there may be changes in the neuronal expression and transport of wild‐type and/or mutant huntingtin at early and late stages of neuronal degeneration in affected areas of the HD brain.

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Annals of Neurology

Tập 42 Số 4

604-612

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