We have measured somatostatin-like immunoreactivity SLI in cerebroventricular fluid of patients with Parkinson's disease (PD) and other extrapyramidal disorders with hyperkinesia. Patients with PD showed a significantly lower concentration of SLI when compared with levels in control patients with chronic stable multiple sclerosis or temporal lobe epilepsy. Less markedly decreased levels of SLI were also noted in patients with torsion dystonia. Of two patients with Huntington's disease one showed a high and one a medium concentration of SLI. According to the site of the stereotactic cannula, verified by ventriculopathy, SLI concentrations in CSF specimen obtained from the foramen Monro tended to be higher than in specimen from a supraforaminal level. Of 5 other patients with lateral and third ventricle being accessible during the passage of the stereotactic cannula, 4 showed higher SLI concentrations in the third ventricle compared to the lateral ventricle. High performance liquid chromatographic analysis combined with radioimmunoassay showed molecular heterogeneity of SLI in CSF. The ratio of SST-14 to SST-28 was higher in the third ventricle than in the lateral ventricle.
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