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Articles by V Sossi
Total Records ( 2 ) for V Sossi
  R Nandhagopal , L Kuramoto , M Schulzer , E Mak , J Cragg , C. S Lee , J McKenzie , S McCormick , A Samii , A Troiano , T. J Ruth , V Sossi , R de la Fuente Fernandez , D. B Calne and A. J. Stoessl

Parkinson's disease is a heterogeneous disorder with multiple factors contributing to disease initiation and progression. Using serial, multi-tracer positron emission tomography imaging, we studied a cohort of 78 subjects with sporadic Parkinson's disease to understand the disease course better. Subjects were scanned with radiotracers of presynaptic dopaminergic integrity at baseline and again after 4 and 8 years of follow-up. Non-linear multivariate regression analyses, using random effects, of the form BPND(t) or Kocc(t) = a*e(–bt–dA) + c, where BPND = tracer binding potential (nondispaceable), KOCC = tracer uptake constant a, b, c and d are regression parameters, t is the symptom duration and A is the age at onset, were utilized to model the longitudinal progression of radiotracer binding/uptake. We found that the initial tracer binding/uptake was significantly different in anterior versus posterior striatal subregions, indicating that the degree of denervation at disease onset was different between regions. However, the relative rate of decline in tracer binding/uptake was similar between the striatal subregions. While an antero-posterior gradient of severity was maintained for dopamine synthesis, storage and reuptake, the asymmetry between the more and less affected striatum became less prominent over the disease course. Our study suggests that the mechanisms underlying Parkinson's disease initiation and progression are probably different. Whereas factors responsible for disease initiation affect striatal subregions differently, those factors contributing to disease progression affect all striatal subregions to a similar degree and may therefore reflect non-specific mechanisms such as oxidative stress, inflammation or excitotoxicity.

  L. N Yatham , P. F Liddle , J Erez , M Kauer Sant'Anna , R. W Lam , M Imperial , V Sossi and T. J. Ruth


Although 5-hydroxytryptamine (5-HT) has been implicated in mania, the precise alterations in the 5-HT system remain elusive.


To assess brain 5-HT2 receptors in drug-free individuals experiencing a manic episode in comparison with healthy volunteers using positron emission tomography (PET).


Participants (n = 10) with DSM–IV bipolar I disorder – manic episode and healthy controls (n = 10) underwent [18F]-setoperone scans. The differences in 5-HT2 receptor binding potential between the two groups were determined using statistical parametric mapping (SPM) analysis.


Age was a significant correlate with 5-HT2 receptor binding potential with a similar magnitude of correlation in both groups. The SPM analysis with age as a covariate showed that the individuals with current mania had significantly lower 5-HT2 receptor binding potential in frontal, temporal, parietal and occipital cortical regions, with changes more prominent in the right cortical regions compared with controls.


This study suggests that brain 5-HT2 receptors are decreased in people with acute mania.

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