Turkiye Klinikleri Journal of Case Reports

UNILATERAL (TEK TARAFLI) PARKINSON HASTALIĞINDA,DOPAMİN TAŞIYICILARININ ÇİFT TARAFLI AZALIŞININ PET İLE GÖSTERİLMESİ
Positron Emission Tomography Reveals Bilateral Reductions of Dopamine Transporter in Unilateral Parkinson's Disease
Neşe İlgin KARABACAKa
aDept. of Radiology, Division of Nuclear Medicine, The Johns Hopkins University, Baltimore, U.S.A.
Turkiye Klinikleri J Med Res. 1998;16(1):20-5
Article Language: TR
Full Text
ÖZET
18F-fhıoroDOPA ve son yıllarda da 11C-JVIN 35,428 kullanarak pozitron emisyon tomografi (PET) ile dopaminerjik yolakların görüntülenmesi, Parkinson hastalığının erken ve ayırıcı tanısında önemli ölçüde yarar sağlayan bir yöntemdir. Bu çalışmanın amacı, hemiparkinsonlu olgularda asemptomatik bazal gangliada I1C-W1N 35,428, tutulumunu ölçıımlenıe yolu ile presemptomatik dopamin transport proteini kaybını görüntüleme ve gelecekte erken dönemde nöroprotektif tedavinin başlanması açısından preklinik dönemde PD saptamanın mümkün olup olamayacağını araştırmak idi.Bu amaçla seınptomatik ve asemptomatik bazal ganglia spesifik 11C-WIN 35,428 bağlanma oranları 7 hemiparkinsonlu olgu (ortalama semptom süresi 3.6yıl, ortalama yas 54±8 yıl) ile 7 kontrol olgusunda (ortalama yaş 55±9 yıl) PET uygulanarak karşılaştırıldı. Hemiparkinson olgularında klinik semptom gözlenmeyen tarafı kontrol eden striatal yapılarda spesifik 11CWIN 35,428 bağlanma oranlarının kontrol gurubunda saptanan değerlerden belirgin olarak düşük olduğu gözlendi (p<0.05). Bu azalma seınptomatik taraf için posterior putamen, anterior putamen ve nukleus kaudatıısta sırası ile 64%), 47%, and 23%> oranında iken asemptomatik taraf için yine sırası ile 51%, 28% and 18%, oranında idi. Seınptomatik ve asemptomatik tarafın putamen ve nukleus kaudatus spesifik 11C-WIN 35,428 bağlanma oranları birbiri ile karşılaştırıldığında anterior putamende sağ ve sol arasında belirgin fark saptanırken (p<0.01), posterior putamen bağlanma oranları arasında anlamlı bir fark gözlenmemesi (p=0.()8), klinik olarak etkilenen ve etkilenmeyen tarafı kontrol eden posterior putamen bölgesinde biyokimyasal olarak benzer düzeyde dopamin transport proteini kaybı olduğunu ortaya koydu. Bu sonuçlar PET ile parkinson hastalığının presemptomatik tanısının mümkün olabileceğini ve erken dönemde dopaminerjik terminal kaybının beyinde biyokimyasal o/arak ölçümlenebileceğini göstermektedir. Gelecekte bu yöntemle klinik yaklaşımdan daha önce tanıya giderek erken dönemde nöroprote/dif therapiye haşlamak mümkün olabilir

Anahtar Kelimeler: Tek taraflı Parkinson hastalığı, Dopamin taşıyıcıları, PET
ABSTRACT
Positron emission tomography (PET) with dopaminergic neuromarlcers initially with 18F- fluoroDOPA and, more recently, by 11C-WIN 35,428, has shown great promise for biochemical differentiation ofPD early in the course of the illness. The purpose of this study was to quantify the reduction in 11CWIN 35,428 binding in the basal ganglia corresponding to the asymptomatic side to provide information that may be helpful in the future for the presymptomatic diagnosis ofPD. 11C-W1N 35,428 binding in seven patients with early PD, affecting the left limbs in five, and the right limbs in two (mean symptom duration of 3.6 years and mean age 54±8 years) were compared with a group of seven normal subjects (mean age 55±9 yers).The preliminary data demonstrate decreased [11CJ-WIN 35,428 binding in the bazal ganglia both contralateral to the clinically asymptomatic side and in the ipsilateral side in patients with heini-/)arkinsonism (p<0.05). The reduction in [11CJ-WIN 35,428 binding contralateral to the symptomatic side were 64%, 47% and 23%> in the posterior putamen, anterior putamen and caudate nucleus, respectively. On the clinically silent side, the percent reduction was 51%, 28% and 18%, respectively.Interestingly, when the affected side was compared to the unaffected side of the same individual, significant differences were observed in the anterior putamen (p<0.01), but not in the posterior putamen (p=0.08), suggesting that a significant overlap exists between affected and clinically unaffected regions. These findings indicate that presymptomatic diagnosis of PD by using PET is possible and this early dopaminergic terminal loss may be biochemically measured in the brain. In the future such a test could be used to provide an earlier diagnosis than is possible by clinical means, thus leading to prompt institution of neuroprotective therapy.

Keywords: Unilateral Parkinson disease. Dopamine transporters, PET

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