[A method for obtaining the normalized cDNA libraries based on the effect of suppression of polymerase chain reaction].

A new efficient method for obtaining cDNA libraries with equal representation of all cDNA types (equalized libraries) in a single round of equalization was developed. The method is based on differences in the renaturation kinetics of double-stranded cDNAs of different genes and allow the selection of the equalized single-stranded fraction resulted from the incomplete reassociation of the total cDNA without laborious and inefficient physical separation. The equalized single-stranded fractions are selectively amplified by polymerase chain reaction (PCR).

[Thyroliberin: new physiological effects and prospects of clinical use].

In addition to the well-known activities of TRH (stimulation of respiration, antidepressant action, increase of motility, antishock action, therapeutic effects against ataxia, and so forth), some new properties were established. TRH was found (1) to stimulate the contractility of lymph vessels in ultra-low doses and to be useful in the treatment of acute pancreatitis; (2) to normalize cerebral circulation in rats and neonates after asphyxia; (3) to improve the electrophysiological parameters of the retina and pigmented epithelium in rats and man, to exert a long-term positive influence on the health status of patients suffering from senile retinal macular dystrophy; (4) to potentiate the analgesic effect of low doses of morphine in a definite range of doses (analog PR-546). It is of paramount importance that most of the indicated activities of TRH may hold promise for clinical application.

[Protective action of thyroliberin and its synthetic analog (PR-546) in craniocerebral trauma].

The effect of TRH and its synthetic analogue (PR-546) devoid of hormonal activity was studied in acute experiments on rats on the model of neurogenic lung edema caused by skull injury. It was proved that the preliminary (for 30 min before the injury) i/p introduction of TRH (in doses 0.5-1 mg/kg) and PR-546 (in doses 4-8 mg/kg) prevented the development of acute edema and the changes of blood gas compositions as well as disorders in breathing after skull injury.

[Recovery of impaired respiratory activity in cats by thyroliberin analog (PR-546) devoid of hormonal properties].

Synthetic analogue thyroliberin (PR-546) devoid of hormonal activity, recovered respiration in conditions of hyperventilation, two-sided vagotomy and hypoxia, caused by the 40-70% bleeding. PR-546 (in doses 100-500 micrograms/kg) intravenously injected was shown to abolish diagram activity decreased effect after hyperventilation. Injection of PR-546 to vagotomized cats in 1.