['To investigate the effect of cerebrospinal fluid (CSF) of HIV-1-seropositive patients with and without HIV-1-associated dementia complex (HADC) on the intracellular Ca2+ regulation of cultured cortical astrocytes.', 'In a blinded study the effects of CSF samples from HADC patients and from HIV-1-seropositive but not demented patients on intracellular Ca2+ regulation of cultured cortical astrocytes were investigated. Astrocytes were chosen because they contribute to both electrophysiological and immunological processes within the brain.', 'Astrocytes were incubated in CSF samples for 1 h, loaded with the Ca2+ indicator dye Fura-2 and intracellular Ca2+ responses upon glutamate application were measured.', 'CSF samples from 10 out of 11 HADC patients induced a significant reduction of the intracellular Ca2+ increase upon glutamate application. On the contrary, seven out of 10 CSF samples from HIV-1-seropositive patients without HADC as well as 10 out of 10 CSF samples from HIV-1-seronegative controls did not affect the intracellular Ca2+ response.'] Do soluble cerebrospinal fluid factors induce Ca2+ dysregulation in rat cultured cortical astrocytes in HIV-1-associated dementia complex?