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Biomedical subjects

A Stratone

Publications and source records attributed to A Stratone.

At least 19 recordsLinked to original sources
PubMed1986

Evidence for the involvement of cerebral renin-angiotensin system (RAS) in stress analgesia.

Studies concerning variations of the central renin-angiotensin system (RAS) during immobilization stress in rats have shown a significant increase in renin-like activity in the hypothalamus and fronto-parietal cortex, together with a definite decrease in the hypophysis and pineal gland. The resultant stress analgesia is blocked by the previous administration of naloxone and saralasin (angiotensin II antagonist). The intracerebral administration of renin and angiotensin II produces an increase in latencies to thermoalgesic stimuli; this is reduced, as is immobilization stress, by naloxone and saralasin. Both chemical hypophysectomy obtained by dexamethasone pretreatment as well as surgical epiphysectomy block the stress-induced analgesia. The experimental data obtained argue in favour of the participation of the cerebral RAS in stress analgesia through the indirect mechanism of release of opioid peptides.

Analgesia↗
PubMed1981

Possible hormonal role of the angiotensin-like peptides in mammals' pineal gland.

An isorenin is synthetized in the pineal gland cells. The amount of isorenin as well as the synthesis of angiotensin I and II in the pineal gland depends on the circadian rhythm, osmotic stimuli and stimulation of the cervical sympathetic postganglionar fibres. Pineal angiotensin is released both into the blood and in the cerebrospinal fluid (CFS). The major site of the pineal angiotensin action are the circumventricular organs, the preiventricular receptors of the anterior hypothalamus and the epiphysis cerebri itself. Except its participation in regulating arterial pressure and the hydroelectrolytic metabolism, through its central effects on the brain, pineal angiotensin-like peptides also participate in the pool of circulating angiotensin and it may represent Farrell's pineal glomerulotropic factor.

Angiotensin I↗
PubMed1975

A renin-like activity in pineal gland and hypophysis.

The presence and distribution of renin-like activity in hypophysis, pineal gland and some neural tissues were studies in both normal and salt-loaded rats. The Boucher micromethod was used to detect enzymatic activity. In normal rats both the pituitary and pineal glands contained significantly higher values of renin-like activity than did the other tissues examined. In salt-loaded animals there was a significant decrease of the renin-like activity of the glandular tissue while in the other brain areas the activity increased. The results are discussed in terms of the possible physiological role of the central renin-angiotensin system in the regulation of fluid and electrolyte balance.

Animals↗
PubMed1975

[Cerebral renin-like activity in different functional conditions (author's transl)].

Using the Boucher micromethod of determining renin activity in the frontoparietal cortex, brain stem, hypothalamus, hypophysis, and epiphysis rat tissue in different functional conditions, we have observed the following: 1 In rats previously treated with an I. V., injection of 1-1.5 ml 10% NaCl, an increase of renin-like activity was found in the cerebral cortex, brain stem and hypothalamus, whereas in the grandular tissue there was a significant decrease...

Angiotensin II↗
PubMed1975

A renin-like activity in pineal gland and hypophysis.

Using Boucher micromethod for determining renin activity in the rat pineal gland and hypophysis tissues, before and after NaCl 10% i.v. administration, the normal rats showed an average value of 96.8 +/- 21 ng Ang/g/h at the hypophysis level, and 325 +/- 66 ng Ang/g/h in epiphysis. In rats previously treated with 1--1.5 ml. NaCl 10% i.v., a more reduced renin-like activity was found both in hypophysis and epiphysis, that is 36.5 +/- 13 ng Ang/g/h and 144.5 +/- 38 Ang/g/h, respectively. In keeping with the previous data regarding the drinking and ADH-releasing effects of angiotensin, the obtained results plead for a possible participation of the cerebral glandular tissue renin in the self-regulating of the hydroelectrolytic balance.

Animals↗