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E J Caliguri

Publications and source records attributed to E J Caliguri.

5 recordsLinked to original sources
PubMed1997

Effects of the selective serotonin reuptake inhibitor fluoxetine on social behaviors in male and female prairie voles (Microtus ochrogaster).

The selective serotonin reuptake inhibitor fluoxetine modifies social behavior in a number of species, including humans. Because the neural substrates for social behavior in prairie voles are sexually dimorphic, we tested whether the effects of fluoxetine on these behaviors differ by sex. Parental and pair-bonded voles were chronically treated with fluoxetine or saline and subsequently tested for parental responsiveness. Fluoxetine-treated animals displayed a longer latency to exhibit parental responsiveness than did saline-treated controls (p < 0.02), but they did not differ in other aspects of parental care. There were no sex differences in the effects of fluoxetine on parental behavior. After completion of the tests for parental behavior, the subjects were tested for aggressive behavior using the resident-intruder paradigm. Fluoxetine-treated males displayed less aggressive behavior than their saline-treated counterparts (p < 0.02). Although we did not find any effects of fluoxetine on aggressive behavior in females, no significant interaction was found between sex and treatment. Fluoxetine did not alter nonsocial behaviors. The findings suggest that serotonin influences social behavior in prairie voles.

Aggression↗
PubMed1991

Selective decrease in extracellular DOPAC concentrations in rat striatum following in vivo dialysis with low concentrations of MPP+.

Using the technique of in vivo dialysis, 1-methyl-4-phenylpyridinium (MPP+), the neurotoxic metabolite of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP), was applied to the rat striatum and the effects of this treatment on the efflux of striatal dopamine (DA) and metabolites were monitored. The inclusion of low concentrations of MPP+ (1 and 10 microM) in the dialysis solution caused a progressive decrease in the efflux of dihydroxyphenylacetic acid (DOPAC), the major deamination product of DA, while homovanillic acid (HVA) and 5-hydroxyindoleacetic acid (5-HIAA) remained unchanged. Unlike the effects of dialysis with millimolar concentrations of MPP+, a large increase in the efflux of striatal DA was not observed. The effect of dialysis with 1 microM MPP+ was blocked if 1 microM GBR 12909, a specific DA reuptake blocker, was included in the dialysis fluid, suggesting uptake of MPP+ into striatal DA terminals mediated this effect.

1-Methyl-4-phenylpyridinium↗
PubMed1985

Determination of catecholamines in tissue and body fluids using microbore HPLC with amperometric detection.

Performance of microbore reverse phase HPLC coupled with amperometric detection is detailed for the analysis of catecholamines in small tissue samples and human blood plasma and cerebrospinal fluid. Extraction procedures for pre-concentration and clean-up of these samples are described. Marked signal enhancement is observed due to the smaller column volume as well as the increased coulometric yield which results from the lower flow rates used with this technique. Detection limits of 0.2 to 0.5 picograms are obtained allowing analysis of catecholamines in extremely small tissue samples or small volumes of cerebrospinal fluid or plasma.

3,4-Dihydroxyphenylacetic Acid↗
PubMed1984

Femtogram detection limits for biogenic amines using microbore HPLC with electrochemical detection.

Detection limits for biogenic amines, serotonin (5-HT), 5-hydroxyindoleacetic acid, 5-hydroxytryptophan, norepinephrine, epinephrine, dopamine and 3,4-dihydroxyphenylacetic acid (DOPAC), of 50-200 fg are reported. This was accomplished using microbore HPLC with electrochemical detection. Reproducibility at the 1-5 pg level of 1.6-8.1% was obtained. The utility of this approach is demonstrated for analysis of brain tissues of 1 microgram or less.

3,4-Dihydroxyphenylacetic Acid↗