ISSN:
1435-1463
Keywords:
Circadian rhythm
;
fluoxetine
;
high performance liquid chromatography
;
5-hydroxyindole acetic acid
;
pineal gland
;
serotonin
;
superior cervical ganglionectomy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary This investigation tested the hypothesis that oxidative deamination of 5HT in the pineal gland occurs primarily in cellular compartments other than the pinealocyte (i.e., noradrenergic nerve terminals and glia). Following sympathetic denervation of the pineal gland by bilateral superior cervical sympathectomy, pineal levels of 5HT and its oxidative metabolite, 5HIAA, were measured by HPLC from samples collected at six time points over the 24 h photoperiod. The role of glia in 5HT deamination was further examined by chronic treatment with the 5HT uptake blocker, fluoxetine (10 mg/kg). Sympathectomy abolished the circadian rhythms of both 5HT and 5HIAA, but had no statistically significant effect on the ratio of 5HIAA/5HT compared to shamoperated and intact controls over the 24 h period. Pineal daytime levels of both 5HT and 5HIAA were unaffected by fluoxetine treatment. These findings indicate that the pinealocyte is an important cellular compartment for 5HT oxidative metabolism.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01245355
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