ABSTRACT
To further explore the role of serotonin (5-HT) in anxiety, 28 healthy volunteers received in a double-blind study d-fenfluramine (30 mg, p.o.) or placebo, and were submitted to a simulated public speaking test (SPS), consisting of speaking in front of a video camera. The SPS induced significant increases in subjective anxiety evaluated by the visual analogue mood scale of Norris [MANCOVA, F(1.66,39.93) = 8.51, P < 0.001], as well as in systolic blood pressure [F(3,72) = 5.70, P = 0.001] and in heart rate [F(3,72) = 3.95, P = 0.012]. The drug decreased the anxiety factor [F(1,23) = 5.21, P = 0.032], without significantly affecting physical sedation, mental sedation or other feelings and attitudes. Also, the physiological measurements were not significantly changed by d-fenfluramine. Reported evidence shows that d-fenfluramine releases 5-HT from nerve endings and blocks 5-HT reuptake, indirectly stimulating postsynaptic 5-HT receptors. Therefore, the present results indicate that 5-HT inhibits the neural substrate of SPS-induced anxiety
Subject(s)
Humans , Male , Female , Adolescent , Adult , Anxiety/prevention & control , Fenfluramine/pharmacology , Verbal Behavior/drug effects , Arterial Pressure , Audiovisual Aids , Double-Blind Method , Receptors, Serotonin/drug effects , Test Anxiety ScaleABSTRACT
We evaluated the psychiatric status of referred cancer patients (N = 39) and referred medical patients at two other institutions (N = 64, N = 62). Depression, anxiety, psychosis, delirium occurred with comparable frequency in both groups. Cancer patients presented with somatic complaints more frequently. However the average number of referrals of cancer patients to the psychiatric service was very low (3/months) compared to referral of medically ill patients (32/month, 10/month). The data suggests that a comparable level of psychological distress exists in cancer patients, and psychiatric referral may help in its early recognition and alleviation.
Subject(s)
Adolescent , Adult , Aged , Aged, 80 and over , Child , Child, Preschool , Disease/psychology , Female , Humans , Infant , Male , Mental Disorders/etiology , Middle Aged , Neoplasms/complications , Referral and ConsultationABSTRACT
5'-Nucleotidase (EC 3.1.3.5) is widely distributed in nature. However, it could not be detected in rat liver, because of the presence of specific inhibitors. Such inhibitors were also found in other tissues of rat, but at lower concentrations than that in the liver. The inhibitor activity was enriched in the membrane fraction and was also present in the cytosol fraction. It was sensitive to treatment with 6M urea and trypsin, while heating in a boiling water bath for 10 min or dialysis reduced the activity only slightly. Gel filtration or Sephadex G-50 yielded two types of inhibitors. Inhibitor I inhibited brain 5'-nucleotidase while inhibitor II inhibited both the brain and liver enzymes. Inhibitor II on further purification on CM Sephadex C-25 yielded five fractions with inhibitor activity of which inhibitor IIC was electrophoretically homogeneous. It had a molecular weight of 8500 by SDS gel electrophoresis, was rich in basic amino acids and had a high proportion of beta structure. Interaction of the inhibitor with 5'-nucleotidase brought about modifications in the secondary structure of the inhibitor as seen from the circular dichroism spectrum.