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1
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Evidence for a D4 dopamine receptor decreasing serotonin N-acetyltransferese activity in chick retina

100%
Zawilska J. B., Nowak J. Z.
Acta Neurobiologiae Experimentalis
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1993
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vol. 53
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issue 3
473-474
EN
In verebrate retina melatonim (MEL) level and activity of serotonim N-acetyltransferase (NAT; a key regulatory enzyme in MEL biosynthetic pathway) fluctuate with a light-dependent circadian rhythm, with peak values at night. The nocturnal increase of MEL synthesis is dramatically suppressed by acute exposure of animals to light. Experimental evidence suggest that the inhibitory effect of light on the MEL-generating system in retina is mediated. at least partially, by dopamine (DA) acting on D2-like DA receptors (2,3). In this work we verified a subtype of DA receptors regulating NAT activity in the retina of chick.
2
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Biphasic effect of the NMDA receptor antagonist MK 801 on the nocturnal NAT activity in chick retina

81%
Zawilska J. B., Rosiak J., Nowak J. Z., Jenek J.
Acta Neurobiologiae Experimentalis
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1997
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vol. 57
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issue 2
163
3
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D2-Dopamine receptor-mediated stimulation of inositol triphosphate formation in chick retina

81%
Zawilska J. B., Krzemieniewska B., Orszulak-Michalak D., Nowak J. Z.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 4
961
4
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Effects of pituitary adenylate cyclase-activating polypeptide (PACAP) on cyclic AMP formation in the duck and goose brain

81%
Nowak J. Z., Kuba K., Zawilska J. B.
Acta Neurobiologiae Experimentalis
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2000
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vol. 60
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issue 2
209-214
EN
Two molecular forms of pituitary adenylate cyclase-activating polypeptide (PACAP), i.e., PACAP27 and PACAP38 (0.0001-1 muM), as well as vasoactive intestinal polypeptide (VIP; 0.1-3 muM), have been studied for their effects on cyclic AMP formation in the hypothalamus and cerebral cortex of duck and goose. All three peptides concentration-dependently stimulated cyclic AMP production in the tested brain regions of 2-3-weeks-old (young) ducks, with VIP showing at least one order of magnitude weaker activity than PACAP. This characteristics suggests the existence in the duck's brain of adenylyl cyclase-linked PAC1 receptors. Both forms of PACAP also stimulated the nucleotide formation in the cerebral cortex and hypothalamus of 5-6-months-old (adult) ducks or geese grown under natural environment. The peptides-evoked effects in adult and young ducks were comparable, and clearly greater than those found in adult geese. The present data extend our recent observations made on chicks, and suggest PACAP to be a potent stimulator of the cyclic AMP generation in the avian central nervous system.
5
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The presence of histamine and tele-methylhistamine in the pineal gland of chick

61%
Zawilska J. B., Woldan-Tambor A., Sek B., Orszulak-Michalak D., Mackova M., Nowak J. Z.
Acta Neurobiologiae Experimentalis
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1996
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vol. 56
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issue 3
691-695
EN
The levels of histamine (HA) and tele-methylhistamine (t-MeHA) in the pineal gland of chick were measured by RIA and two time points, i.e. at the end of the light (L) phase and in the middle of the dark (D) phase of 12h :12h L:D cycle.The chick pineal gland showed high HA levels.The t-MeHA content of chick pineal gland was about 20-times lower than HA levelAn aminoacid precursor of HA, L-histidine given to chicks during L or D significantly increased both HA and t-MeHA content of pineal gland.The L-histidine-evoked elevations in HA level were 2-4 times higher than changes in t-MeHA content.Enzymatic study showed the presence of chick pineal gland of a moderate activity of L-histidine decarboxylase, and well expressed activity of HA-methyltransferase, HA synthetizing and inactivating enzyme, respectively, which suggest that both HA and t-MeHA may be produced within the gland.It is suggested that the metabolic dynamics of the pineal HA may be higher during lighthours than darkhours of the daily light:dark illumination cycle.
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