title: Elevated angiotensin-converting enzyme (kininase II) in the cerebrospinal fluid of neuroleptic-treated schizophrenic patients.
abstract: Disturbances of water homeostasis have frequently been reported in schizophrenia. Water homeostasis is regulated by arginine vasopressin (AVP), the renin-angiotensin system and natriuretic hormones. The aim of this study was to determine the activity of the central renin-angiotensin system in schizophrenia by measuring levels of angiotensin-converting enzyme (ACE) in the cerebrospinal fluid (CSF) and blood in 14 in-patients with schizophrenia on neuroleptic medication and in 9 healthy volunteers. The levels of CSF ACE were significantly higher in the schizophrenia group. There were no correlations between CSF ACE and gender, age, age at first episode, duration of illness, term of hospitalization or neuroleptic dosage. No correlations between CSF ACE and serum ACE were found in either group. The authors suggest an activated central renin-angiotensin system in schizophrenia at least during antipsychotic drug treatment, which may cause 'psychogenic' polydipsia in some patients. ACE and the brain renin-angiotensin system may also play a role in the regulation of neuron growth and differentiation in schizophrenia.
authors.affiliation: Department of Psychiatry, University of Helsinki, Finland.
authors.forename: K
authors.initials: K
authors.lastname: Wahlbeck
authors.forename: R
authors.initials: R
authors.lastname: Rimón
authors.forename: F
authors.initials: F
authors.lastname: Fyhrquist
mesh_terms: D000328:Adult; D014150:Antipsychotic Agents / Q000009:adverse effects / Q000627:therapeutic use*; D001127:Arginine Vasopressin / Q000134:cerebrospinal fluid; D001794:Blood Pressure / Q000187:drug effects / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D007703:Peptidyl-Dipeptidase A / Q000134:cerebrospinal fluid*; D012084:Renin-Angiotensin System / Q000187:drug effects* / Q000502:physiology; D012559:Schizophrenia / Q000188:drug therapy* / Q000201:enzymology; D012565:Schizophrenic Psychology; D014882:Water-Electrolyte Balance / Q000187:drug effects / Q000502:physiology
chemical_list: D014150:Antipsychotic Agents; D001127:Arginine Vasopressin; D007703:Peptidyl-Dipeptidase A