Jj. Lopez-lozano et al., Clinical outcome of cotransplantation of peripheral nerve and adrenal medulla in patients with Parkinson's disease, J NEUROSURG, 90(5), 1999, pp. 875-882
Object. Transplants of adrenal medulla (AM) and fetal ventral mesencephalon
(FVM) are currently being tested as therapeutic alternatives in patients w
ith Parkinson's disease (PD). At the Clinica Puerta de Hierro in Madrid, a
con trolled clinical trial is underway to establish which donor tissue, if
any, is the best for open surgical implantation in patients with PD.
Methods. Since 1987. varying degrees of clinical improvement have been achi
eved in Grade IV and V parkinson lan patients by implanting perfused AM and
FVM into the right caudate nucleus. To investigate further whether implant
ation of different types of donor tissues results in qualitatively and quan
titatively different degrees of recovery, four patients with Grade TV or V
PD received implants of pre-coincubated autologous AM and intercostal nerve
in the caudate nucleus. Four nonsurgically treated patients served as a co
ntrol group. Three pears posttransplantation, longer on phases (46.2% +/- 1
0.4% of the day presurgery to 87.5% +/- 10.4% of the day 36 months postsurg
ery) and improved symptoms in on and off phases persist in all four cases,
with reduced dyskinesias (67.1% +/- 9.2% of the day in on phases presurgery
to 17% +/- 13.8% of the day in on phases 36 months postsurgery). Progress
appears to be stepwise, starting within weeks of tranplantation and becomin
g clinically significant in the 2nd and 3rd months (similar to our AM- and
sooner than in our FVM-implanted patients), followed by a period of stabili
ty and, after a second wave of improvement 12 to 18 months posttransplantat
ion (similar to FVM implants), has continued (87.5 +/- 7 points presurgery
to 46 +/- 5.6 points 36 months postsurgery). In the experimental group, dos
es of levodopa have been reduced by more than 60% and dopamine agonist use
has not resumed. In contrast, there have been no significant clinical chang
es in the control group.
Conclusions. Implantation of tissue other than fetal tissue can promote a l
ong-term improvement in the clinical symptomatology of seriously disabled p
arkinsonian patients. This finding is supported by the autopsy report of a
patient with PD who had undergone grafting of AM plus peripheral nerve in w
hich it was demonstrated that a large number of tyrosine hydroxylase-positi
ve cells survive I year after implantation. In addition, there was a dense
network of host dopaminergic fibers around the graft.