15038 studies
Calcitonin (CT) binds to specific receptors in the hypothalamus and has been localized in the pituitary, suggesting a potential neuroendocrine role for this peptide. We and others have previously shown that CT given centrally markedly suppresses puls…
The solution conformation of the 27 residue polypeptide hormone secretin has been investigated by 1H-NMR spectroscopy under conditions where it adopts a fully ordered structure as judged by circular dichroism spectroscopy, namely in an aqueous soluti…
The effect of the repeated or continuous administration of an analog of GH releasing factor (GH-RF), D-Tyr-1, D-Ala-2, Nle-27, GH-RF(1-29)-NH2 (DBO-29), on the subsequent response to this peptide was investigated in pentobarbital-anesthetized male ra…
The ability of human (h)GRF-(1-29)NH2 to stimulate GH secretion was studied in cannulated adult rats. In order to suppress endogenous GRF secretion and the inhibitory action of hypothalamic somatostatin (SRIF), rats were anesthetized with sodium pent…
This study was undertaken to evaluate the biological potency of two synthetic human growth hormone-releasing factors, hGRF (1-44)NH2 and hGRF (1-29)NH2, on growth hormone (GH) release in young dairy heifers (n = 10) and pigs (n = 10). In each species…
A good response after an intravenous bolus of GRF-1-29 NH2 in patients with hypopituitary dwarfism localities the site of the GH-deficiency in the hypothalamus (GRF deficiency). These patients could be treated with GH and GRF. Never the less some pat…
We compared transient slope of end-systolic pressure-volume line (T-Emax) with steady Emax (S-Emax) in isolated cross-circulated canine left ventricles. T-Emax is the slope of the end-systolic pressure-volume line (ESPVL) determined from the last ste…
Thymosin fraction 5 polypeptides beta 4 and alpha 1 were tested for their ability to affect certain immunological parameters of human peripheral blood lymphocytes (PBL). PBL were cultured with various concentrations of the peptides for 24 hours. Thym…
An enzyme immunoassay for the measurement of thymosin beta 4, a chemically characterized thymic polypeptide, is described. A limited amount of reagent antiserum to synthetic thymosin beta 4 is incubated with liquid-phase thymosin beta 4. Unbound anti…
Thymosin alpha 1 and thymosin beta 4, two peptides isolated from preparations of calf thymus fraction 5, were tested in the human mixed lymphocyte reaction (MLR). Thymosin alpha 1 was found capable of enhancing both the allogeneic and autologous MLR.…
The immunoregulatory polypeptide prothymosin alpha and its biologically active N-terminal fragment thymosin alpha 1m, with relative molecular masses of 12,500 and 3108 respectively, were found to behave as oligomers (trimers to hexamers) in gel-filtr…
A simple one-step procedure for the determination of thymosin beta 4 in whole blood, various blood corpuscles, plasma and serum by reversed-phase high-performance liquid chromatography (HPLC) is described. The blood cells were isolated by a Ficoll de…
A rat spleen cDNA library was prepared and employed for the molecular cloning of the cDNA for thymosin beta 10, a peptide that previously had been found to accompany the closely related peptide, thymosin beta 4, in several species of mammals (S. Eric…
Differential screening of cDNA libraries was used to detect and prepare probes for mRNAs that are regulated in PC12 rat pheochromocytoma cells by long-term (2-week) treatment with nerve growth factor (NGF). In response to NGF, PC12 cells change from…
Gonadal steroids play an important role in the development and regulation of the immune system. Their effects may be mediated through a thymus-hypothalamus-pituitary-gonadal axis. The thymus gland secretes factor(s), including thymosin beta 4, that a…
A cDNA clone encoding human thymosin-beta 4 was isolated from a cDNA library prepared from peripheral blood leukocytes of a patient with acute lymphocytic leukemia. This clone contained the entire coding sequence of 43 amino acid residues of thymosin…
The effect of thymalin and epithalamin on dissemination of tumors treated by pulsed laser radiation was studied in C57B1 female mice bearing subcutaneously transplanted melanoma B16 and Lewis carcinoma. Radiation was delivered from TOC-1001 neodymium…
The experiments on rats have shown changes in the learning ability of animals. The learning of locomotor reactions of escape and avoidance conditioned reflex was accelerated in animals after pinealectomy. Training of rats in U-shaped and 16-door maze…
Sixteen male Holstein calves averaging 168 kg body weight (BW) were used to determine the effects of human growth hormone-releasing factor (1-29)NH2 (hGRF (1-29)NH2; .22 micrograms/kg BW), thyrotropin-releasing factor (TRF; .165 micrograms/kg BW) or…