Abstract:
OBJECTIVE:Clinical trials of fetal neural tissue transplantation for Huntington disease (HD) have been conducted with variable clinical results. However, no long-term analysis of graft survival and integration has been published. Here, we report the pathologic findings in two patients with HD who died 74 and 79 months after transplantation. METHODS:Methods used were pathologic examination, histochemistry, and immunohistochemistry. RESULTS:Neostriatum from both patients showed typical neuropathologic changes of advanced HD. Surviving grafts were identified in both patients (6/6 sites and 7/8 sites, respectively) as well-demarcated nests within host neostriatum with associated needle tracts. Grafted neurons adopted either dominant calbindin/parvalbumin or calretinin immunoreactivity (IR). Few neurofilament, MAP-2, DARPP-32, tyrosine hydroxylase, or calbindin IR processes traversed the host parenchyma-graft interface despite minimal junctional gliosis. Immunohistochemistry for CD68 showed microgliosis that was more pronounced in host striatum than graft. Scattered CD45 and CD3 IR cells were present within grafts and host parenchyma. No ubiquitin IR neuronal intranuclear inclusions were identified in graft neurons, although these were prevalent in host cells. CONCLUSIONS:These two autopsies confirm previous findings of neuronal differentiation and survival of transplanted fetal tissue from the ganglionic eminence and also demonstrate viability of neurons from fetal transplants in human neostriatum for more than 6 years. Despite prolonged survival, these grafts had poor integration with host striatum that is likely responsible for lack of clear clinical improvement in these patients.
journal_name
Neurologyjournal_title
Neurologyauthors
Keene CD,Sonnen JA,Swanson PD,Kopyov O,Leverenz JB,Bird TD,Montine TJdoi
10.1212/01.wnl.0000264504.14301.f5subject
Has Abstractpub_date
2007-06-12 00:00:00pages
2093-8issue
24eissn
0028-3878issn
1526-632Xpii
68/24/2093journal_volume
68pub_type
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