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Increase of cardiodepressant activity in medium incubating the posterior pituitary lobe in situ during vagal nerve stimulation in rat

100%

Goraca A., Traczyk W. Z.

Journal of Physiology and Pharmacology

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1991

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tom 42

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nr 3

Previous studies have indicated that there is a cardiodepressant factor in the medium incubating the posterior pituitary lobe in situ. The cardiodepressant activity of the medium incubating the posterior pituitary lobe before and during stimulation of the vagus nerves was tested on isolated auricles of the right heart atrium of a two-day-old rat. It was found that the medium incubating the posterior pituitary lobe collected before stimulation decreased the contraction rate of the auricle by 34%, while that collected during the intermittent stimulation of the central ends of the cut vagus nerves caused a decrease of the auricle contractions frequency by 52%. The addition of cholinergic, serotoninergic, histaminergic receptor blockers or prostaglandin synthetase into Ringer-Lock’s solution bathing the auricle has no effect on the changes of the contraction rate caused by the incubation medium.

2

Increase in and in the outflowing from region after stimulation in

100%

Lipinska S., Orlowska-Majdak M., Traczyk W. Z.

Journal of Physiology and Pharmacology

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1996

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tom 47

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nr 2

3

Vasopressin release from posterior pituitary lobe incubated in situ after preganglionic stimulation of the rat superior cervical ganglion

100%

Lipinska S., Orlowska-Majdak M., Traczyk W. Z.

Journal of Physiology and Pharmacology

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1992

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tom 43

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nr 4

In uretane-chloralose anaesthesia the pituitary gland was exposed by transpharyngeal approach in rats. The anterior lobe was removed and the posterior lobe was incubated in situ, that is in conditions of anatomical integrity of the hypothalamus with the posterior pituitary lobe. The 15-min samples of the medium incubating the posterior pituitary lobe in situ were collected. Vasopressin (AVP) content in the incubation medium was determined by radioimmunoassay. The stimulation of preganglionic fibers of the superior cervical ganglion (SCG) with alternate short (5 s) bursts of electric pulses with short (5 s) breaks did not change A VP release. However, stimulation of preganglionic fibres with alternate long (30 s) bursts of electric pulses with long (30 s) breaks evoked an increase in AVP release after some latency . Probably, at the hypothalamic or posterior pituitary level temporal summation should occur affecting vasopressinergic neurons or their endings and evoking AVP release.

4

Partial purification and identification of cardiodepressant factor from the posterior pituitary lobe in rats

100%

Goraca A., Walkowiak B.

Journal of Physiology and Pharmacology

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2000

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tom 51

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nr 1

5

The lack of influence of some neuropeptides present in the posterior pituitary lobe on the frequency of spontaneous contraction of the isolated heart auricle

84%

Goraca A., Traczyk W. Z.

Acta Physiologica Polonica

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1990

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tom 41

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nr 7

Gorąca A., Traczyk W. Z.: The lack of influence of some neuropeptides present in the posterior pituitary lobe on the frequncy of spontaneous contraction of the sisolated heart auricle. Acta Physiol. Pol. 1940, 4 (6): Investigations have shown the presence of a cardiodepressant factor in the fluid incubating the posterior pituitary lobe “in situ”, which decreased contraction frequency of the isolated heart auricle (Acta Physiol. Pol., 1984, 35: 460-468). The influence on the spontaneuos contraction frequency of the isolated heart auricle of the following synthetic neuropeptides was determined: substance P, leu-enkephalin, met-enke- phalin, angiotensin II, arg-vasopressin, oxytocin, delta sleep-inducing peptide and atrial natriuretic factor. It was found that the investigated neuropeptides had no effect on the contraction frequency of the isolated auricle of the heart right atrium of two-day-old rat in a concentration from 2.1 × 10⁻⁷ to 1 × 10⁻³ mol/1 in the bathing medium and it was concluded that their biological properties differ from the cardiodepressant factor.

6

The increase in the cardiodepressant activity and vasopressin concentration in the sella turcica venous blood during vagal afferents stimulation or after angiotensin II infusion

67%

Goraca A., Orlowska-Majdak M., Traczyk W. Z.

Journal of Physiology and Pharmacology

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1996

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tom 47

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nr 2

7

Increase in cardiodepressant factor release from the posterior pituitary lobe after angiotensin II infusion into the internal carotid artery

67%

Goraca A., Traczyk W. Z.

Journal of Physiology and Pharmacology

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1997

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tom 48

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nr 2

Ograniczanie wyników

6 Journal of Physiology and Pharmacology

1 Acta Physiologica Polonica

6 Traczyk W. Z.

5 Goraca A.

3 Orlowska-Majdak M.

2 Lipinska S.

1 Walkowiak B.

1 2000

1 1997

2 1996

1 1992

1 1991

1 1990

Increase of cardiodepressant activity in medium incubating the posterior pituitary lobe in situ during vagal nerve stimulation in rat

Increase in and in the outflowing from region after stimulation in

Vasopressin release from posterior pituitary lobe incubated in situ after preganglionic stimulation of the rat superior cervical ganglion

Partial purification and identification of cardiodepressant factor from the posterior pituitary lobe in rats

The lack of influence of some neuropeptides present in the posterior pituitary lobe on the frequency of spontaneous contraction of the isolated heart auricle

The increase in the cardiodepressant activity and vasopressin concentration in the sella turcica venous blood during vagal afferents stimulation or after angiotensin II infusion

Increase in cardiodepressant factor release from the posterior pituitary lobe after angiotensin II infusion into the internal carotid artery