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2 Polish Journal of Environmental Studies

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Effect of combined prenatal exposure to aluminium and ethanol on central dopamine, serotonin and muscarine receptor reactivity in rats

100%

Brus R. , Szkilnik R. , Nowak P. , Mikolajun U. , Tramer W. , Mengel K.

nr 2

Ethanol (EtOH) abuse in pregnancy is know to seriously damage the internal organs of the fetus, a condition in humans that is classified as "fetal alcohol syndrome". Aluminium (Al) can develop neurotoxic effects and contribute to some neurological disorders. To test whether the reactivity of some central receptors (dopamine - DA, serotonin-5-HT and muscanne - M) may be altered by prenatal EtOH and Al, administered separately or jointly, female rats were given 10% (v/v) EtOH and/or Al(600 or 3000 ppm) throughout pregnancy in their drinking water. Male adult offspring were tested at 3 months for behavioural effects know to be induced by agonists acting at different subtypes of DA (D1 D2, D3,), 5-HT2t and M receptors. Addition antagonist of D, receptor have been examined. The substances SKF 38393, quinpirole, mCPP, pilocarpine, haloperidol, and the behavioral procedures of yawning, oral activity and catalepsy have been used for assessment. The results of the experiment indicate that EtOH does not modify the effect of the central DA and M receptor agonist and DA antagonist in Al prenataly exposed rats. On the other hand, EtOH modified the reactivity of the central 5-HT2c receptor to agonist (mCPP) in Al pretreated rats.

Effect of organic mercury exposure during early stage of ontogenic development on the central dopaminergic system in adult rats

84%

Durczok A. , Szkilnik R. , Brus R. , Nowak P. , Labus L. , Konecki J. , Drabek K. , Kuballa G. , Rycerski W. , Mengel K.

2002

tom 11

nr 4

Organic mercury (CH3HgCl) with metal concentration 5 ppm in tap water was applied to rats suckling their newborn for the first 21 days of life. A second group of young rats took the mercury in their tap water 5 ppm from the 22nd to the 43rd day of postnatal life. Control rats drank tap water only. In 2-month-old male rats the following behavioral study was performed after saline or specific central dopamine receptor agonists and agonists apply (quinpirole, SKF-38393, haloperidol, SCH-23390): irritability, yawning behavior, oral activity, locomotion, exploratory activity, and catalepsy. In the striatum and frontal cortex of three examined groups the biogenic amines levels (DA, DOPAC, HVA, 3-MT, 5-HT, 5-HIAA, NA) were estimated by means of HPLC/ED technique, and DA and 5-HT turnover. The effect of quinpirole (a central dopamine D2 receptor agonists) was also examined on (3H)glucose uptake in discrete parts of the brain. It was shown that mercury affected behavioral changes after dopaminergic agents apply to adult animals when exposed in the period from the 22nd to 43rd day of postnatal development. Biochemical changes (biogenic amines level, turnover and (3H)glucose uptake) were more pronounced in adult animals exposed to mercury via mother's milk (1st to 21st day of life). In light of the above we conclude that early postnatal exposure of rats to organic mercury modulates activity of the central dopamine neurotransmitter system.