15038 studies
The mechanism of profilin-promoted actin polymerization has been systematically reinvestigated. Rates of barbed-end elongation onto Spectrin.4.1. Actin seeds were measured by right angle light scattering to avoid confounding effects of pyrenyl-actin,…
Thymosin beta(4) possesses actin-sequestering activity and, like transglutaminases, is supposed to be involved in cellular events like angiogenesis, blood coagulation, apoptosis and wound healing. Thymosin beta(4) serves as a specific glutaminyl subs…
As many antitumor drugs can kill tumors through the induction of apoptosis, the effect of these drugs presumably would be enhanced if they were used in combination with other drugs that interact with apoptotic processes. To clarify the biological eve…
When human umbilical vein endothelial cells (HUVEC) differentiate into capillary-like tubes, there is a five-fold upregulation of the mRNA for thymosin beta4 (Tbeta4) (Grant et al. J Cell Sci 1995; 108: 3685-94 [1]) and this endogenous expression pla…
This report describes methods for measuring nitric oxide production by the lungs' lower alveolar airways (VNO), defined as those alveoli and bronchioles well perfused by the pulmonary circulation. Breath holding or vigorous rebreathing for 15-20 s mi…
For high-intensity cycle ergometer exercise, the tolerable duration (t) is well characterized as a hyperbolic function of power output, P : t = W'/(P-thetaF), where thetaF may be termed the "fatigue threshold." The purpose of this study was to determ…
We monitored the volume of C6 glioma cells in suspension using a Coulter Counter and exposed the cells to micromolar or nanomolar levels of collagenase or clostripain. In 13 experiments, type IV collagenase (310 units ml-1; approximately 3 microM L-1…
To elucidate the involvement of growth hormone (GH) in the genetic change produced by long-term selection in growth and fatness, a 'GH knock-out study' on over 900 mice was undertaken. Lines used had been selected for more than 50 generations for hig…
Natural brain peptides cortexin and epithalamine, and synthetic polypeptides were used to study their effects on organotypic culture of dorsal root ganglia and brain tissue from a 10-11-day old chick embryo. The effects involved activation of the tis…
The data on a randomized treatment of 100 patients with locally advanced cervical carcinoma are discussed. Half of the patients received complex therapy while the rest--radiation alone (control). The modality also included immunotherapy with epithala…
The effects of a single-shot intraperitoneally administration of melatonin in a dose of 1 mg per kg body weight and epithalamin in a dose of 2.5 mg per kg body weight on the activities of Na+, K(+)-ATPase and 5'-nucleotidase were investigated in the…
Zadaxin (thymosin alpha1; Talpha1) is a synthetic 28 amino acid peptide with multiple biological activities primarily directed towards immune response enhancement. Since the immune system plays a critical role in the control and elimination of viral…
Antagonists of growth hormone-releasing hormone (GH-RH) inhibit the growth of various tumors through mechanisms that involve the suppression of the insulin-like growth factor I and/or insulin-like growth factor II levels or secretion. In the present…
GHRH is produced in a variety of extrahypothalamic tissues, including some neoplasms. We have previously reported that GHRH antagonists can inhibit the growth of various human cancers xenografted into nude mice. These observations suggest that locall…
Antagonistic analogs of growth hormone-releasing hormone (GHRH) suppress growth of various tumors in vivo. This effect is exerted in part through inhibition of the GHRH-GH-insulin-like growth factor (IGF)-I axis. Nevertheless, because autocrine/parac…
Free fatty acids (FFA) physiologically regulate GH release via a negative feedback. The aim of this study was to examine whether such feedback is preserved in acromegaly, a condition in which alterations in other regulatory mechanisms of GH release o…
A receptor for vasoactive-intestinal-peptide (VIP)-related peptides was functionally characterized in a cell line derived from Xenopus melanophores using a recently described microtiter-plate-based bioassay. Activation of the melanophore VIP receptor…
In aging, alterations of pituitary GH-releasing hormone (GHRH) receptor (GHRH-R)-binding sites have been proposed as one of the initiating factors contributing to the loss of somatotroph responsiveness to GHRH. Changes in the characteristics and/or c…
Hormones within the somatotropin cascade influence several physiological traits, including growth and reproduction. Active immunization against growth hormone-releasing factor (GRFi) initiated at 3 or 6 mo of age decreased weight gain, increased depo…