Search results for "HORMONES"

Nebennieren undrenale Oxytocin-Wirkungen bei der Ratte

1959

No significant improvement in water diuresis was obtained by the s. c. injection of 500–1000 mU/kg of a synthetic oxytocin preparation (Syntocinon) in adrenalectomized, salt-maintained rats given 18 ml of water per rat by stomach tube. In these animals oxytocin had, on the other hand, a strong natriuretic and chloruretic effect.

Der Einflu� von Adrenalektomie und Nebennierenrindenhormonen auf die renalen Clearancen von Inulin, p-Aminohippurat, echtem endogenen Kreatinin und H…

1959

Growth hormone protects human lymphocytes from irradiation-induced cell death

2003

1. Undesired effects of cancer radiotherapy mainly affect the hematopoietic system. Growth hormone (GH) participates in both hematopoiesis and modulation of the immune response. We report both r-hGH cell death prevention and restoration of secretory capacities of irradiated human peripheral blood lymphocytes (PBL) in vitro. 2. r-hGH induced cell survival and increased proliferation of irradiated cells. Western blot analysis indicated that these effects of GH were paralleled by increased expression of the antiapoptotic protein Bcl-2. 3. r-hGH restored mitogen-stimulated release of IL-2 by PBL. Preincubation of irradiated lymphocytes with the growth hormone receptor (GHR) antagonists B2036 an…

Synthesis of nitric oxide in the dorsal motor nucleus of the vagus mediates the inhibition of gastric acid secretion by central bombesin

1999

1. Central administration of bombesin inhibits gastric acid production independently of the centrally or peripherally-acting stimuli employed. This study evaluates the role and location of the cerebral nitric oxide (NO) implicated in the inhibitory effect of central bombesin on in vivo rat gastric acid secretion, as induced by distension with 15 cm H2O, insulin (0.75 u.i. kg-1 i.p.) TRH (1.2 microg kg-1, i.c.) or pentagastrin (100 microg kg-1, i.p.). 2. The acid-inhibitory effect of i.c. bombesin (40 ng kg-1) was prevented by prior administration of L-NAME (80 microg kg-1) in the dorsal motor nucleus of the vagus (DMN). This dose of L-NAME when administered into the nucleus of the tractus s…

Variations of plas14a benin activity and aldostehone levels in the rat after administration of saline, chrystalloid and colloid solutions

1976

Abstract The data reported in the present paper refer to quantitative variations of plasma renin activity (PRA.) and of plasma aldosterone levels in rats after adiministration of saline, chrystalloid and colloid solutions. In our experimental conditions PRA and plasma aldosterone levels were shown to increase significantly after administration of distilled water and glucose solution. Variations of PRA and plasma aldosterone levels were only slight when plasma volume was made to increase due to administration of polyvinylpirrolidone solution. PRA, instead, was significantly lower in rats having received saline salution.

Editorial: Relevance of Steroid Biosynthesis, Metabolism and Transport in Pathophysiology and Drug Discovery

2019

Candidate target mechanisms of the growth inhibitor cyromazine: Studies of phenylalanine hydroxylase, puparial amino acids, and dihydrofolate reducta…

2000

Cyromazine, an insect growth regulator, affects larval and pupal cuticles in dipterans and some other insects. The mode of action of this aminotriazine is not known yet, though it has been shown not to inhibit the synthesis of chitin and cuticular proteins. Cyromazine may, however, act on some step(s) of sclerotization of the cuticle. In the present study, we have analyzed the key enzyme for the production of sclerotization agents, phenylalanine hydroxylase (PAH), using the enzyme from Drosophila, a cyromazine-sensitive insect. PAH was studied in vitro with cyromazine and three biologically less active derivatives at concentrations ranging from 1 μM to 1 mM. None of the compounds did signif…

Progress in the characterization of insulin-like peptides in aphids: Immunohistochemical mapping of ILP4.

2021

Aphids were the first animals described as photoperiodic due to their seasonal switch from viviparous parthenogenesis to sexual reproduction (cyclical parthenogenesis) caused by the shortening of the photoperiod in autumn. This switch produces a single sexual generation of oviparous females and males that mate and lay diapausing cold-resistant eggs that can overcome the unfavourable environmental conditions typical of winter in temperate regions. Previous studies have hinted at a possible implication of two insulin-like peptides (ILP1 and ILP4) in the aphid seasonal response, changing their expression levels between different photoperiodic conditions. Moreover, in situ localization of their…

Instabilities of infinite matter with effective Skyrme-type interactions

2002

The stability of the equation of state predicted by Skyrme-type interactions is examined. We consider simultaneously symmetric nuclear matter and pure neutron matter. The stability is defined by the inequalities that the Landau parameters must satisfy simultaneously. A systematic study is carried out to define interaction parameter domains where the inequalities are fulfilled. It is found that there is always a critical density $\rho_{cr}$ beyond which the system becomes unstable. The results indicate in which parameter regions one can find effective forces to describe correctly finite nuclei and give at the same time a stable equation of state up to densities of 3-4 times the saturation de…

Dzīvības procesu ķīmiskie regulatori: vitamīni un hormoni

1948

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