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Biomedical subjects

Z Szreniawski

Publications and source records attributed to Z Szreniawski.

At least 19 recordsLinked to original sources
PubMed1986

[Interactions between herbicides and various of the most frequently used drug groups. I. Interactions between chronically administered herbicides: carbendazyme, 2,4-dichlorophenoxyacetic acid and 2,4,5-trichlorophenoxyacetic acid and drugs affecting the circulatory system].

The influence of chronically administered (6 weeks) herbicides (KAR, 2,4-D and 2,4,5-T) on pharmacological effects of quinidine, reserpine and strophantin K in mice and rats was examined in vivo. The investigated herbicides produced in mice an increase in acute toxicity of strophantin K, the acute toxicity of either reserpine oro quinidine being unchanged. The herbicides alone, after 6 weeks administration, significantly increased mean arterial pressure of rats, however the hypotensive response to reserpine was not statistically influenced in these animals as compared with controls. The prolonged administration of investigated herbicides produced also the increased sensibility of heart to the arrhythmic effects of quinidine and ouabain as observed in the ecg pattern in rats treated with increasing doses of these agents. The studies indicate the significance of the possible pharmacological interactions between the drugs affecting cardiovascular system and commonly used herbicides in men.

2,4,5-Trichlorophenoxyacetic Acid↗
PubMed1981

Substance P, hexapeptide pGlu6(SP6-11), analgesia and serotonin depletion.

Substance P caused marked analgesic activity in rats after intraventricular administration and in mice after intraperitoneal injection. The hexapeptide pGlu6(SP6-11) was active in mice, but not in rats. Depletion of serotonin with p-chlorophenylalanine abolished the antinociceptive activity in mice, but not in rats, whereas lesion of raphe nuclei blocked the activity of substance P in the latter animals. Although different routes of administration were used, the results seem to indicate different mechanisms of analgesic activity of both peptides in rats and mice, as well as the different role of serotonergic transmission in pain control mechanisms in both species.

Analgesics↗
PubMed1980

The influence of raphe nucleus lesions on fertility in the female rat.

By lesioning brain raphe nuclei, the effect of decreasing the activity of the serotoninergic (5-HT) system on the fertility of the female rat was investigated. The females were mated on the 10th day after lesioning. On both the 15th and 21st day of pregnancy the numbers of live and resorbed foetuses and the weights of placentas in the lesioned groups did not differ statistically as compared with the control group. Interestingly, the lesioned group showed an increase in the number of ovulating cells on the one hand, and decrease in the number of implantations on the other. The data obtained strongly suggest that midbrain serotoninergic cell groups (B7, B8) inhibit ovulation and are not associated with initiation of labour in the female rat.

Animals↗
PubMed1978

Antagonism by morphine and pethidine of the contractile effects of PGE2 on isolated uterus of the rat.

Morphine antagonizes the twitches evoked by administration of PGE2 on spontaneous contractile activity in the isolated uterus of the rat. This action is dose-dependent. Concentrations as low as 2.6 nM completely abolished contractile activity of PGE2 added to the bath at a concentration of 0.5 ng ml-1. In contrast to morphine, pethidine partially antagonized the stimulatory action of PGE2 at much higher concentrations.

Animals↗
PubMed1977

Central anticholinergic effects of N-ethyl-2-pyrrolidylmethyl-cyclopentylphenyl glycollate.

The following effects of N-ethyl-2-pyrrolidyl-methyl-cyclopentylphenyl glycollate (PMCG) have been studied: effects on aggressive behaviour in mice and on general behaviour in rats, protective effects against central action of arecoline and nicotine in mice, thermo-regulatory effects in mice, protective action in poisonings with fluostigmine in mice and rats, and effects on bioelectrical activity of the brain in cats. It was stated that PMCG possesses a strong central anticholinergic activity blocking predominantly central muscarinic receptors; PMCG had also strong protective effects in anticholinesterase intoxications. It is suggested that this drug could have antiemotional and antiparkinsonian properties.

Aggression↗
PubMedDate not supplied

Effects of lesions of monoaminergic system in the brain on the hypotensive effects of clonidine in rats.

Bilateral lesions of the locus coeruleus markedly reduced hypotensive effects of clonidine in rats. Lesions shifted laterally did not evoke any significant change of the hypotensive effects of clonidine or bradycardia induced by it. Lesions of the ventral and dorsal noradrenergic tract at the midbrain level and lesions of the midbrain raphe area failed to change hypotensive response to clonidine.

Animals↗
PubMedDate not supplied

The effects of lesion of mesolimbic dopamine neurons on pain threshold and morphine analgesia in rats.

Lesions of ventral tegmental area, localised in the region of A 10 group of dopaminergic mesolimbic neurons decreased the pain threshold in rats. The absolute threshold values in morphine treated animals with the above lesion were lower than in sham-operated controls, however, the thresholds expressed as percentage of predrug threshold values did not differ in both lesioned and sham-operated animals. It is thought, that lesions of ventral tegmental dopamine neurons decrease the pain threshold due to the increase of general excitability of animals, and that there is no direct involvement of the lesioned structure in the primary mechanism of morphine analgesia.

Analgesics, Opioid↗
PubMedDate not supplied

Computer assisted quantitative densitometric analysis of 125I-apamin binding sites in the central nervous system.

The binding sites for 125I-monoiododerivative of apamin in the central nervous system of rat, guinea-pig, chicken and frog were analysed and compared by computer assisted quantitative densitometric autoradiography on X-ray film. The highest level of binding sites in the rat and guinea-pig brain was found in the limbic-olfactory system and in the substantia gelatinosa of the spinal cord. In the chicken brain apamin binds preferentially to the tectum opticum and nuclei isthmi. In the frog brain no specific apamin binding sites were found. The role of presented topography for apamin binding sites is discussed in relation to neurotoxic properties of apamin.

Animals↗