Publications by authors named "Saltis J"

Introduction: Up to 70% of older adults have experienced a psychologically traumatic event in their life. Traumatic events can have lifelong effects on functioning and emotion regulation and can affect behavior and experiences in care settings. Common healthcare practices and environments can be re-traumatizing for trauma survivors.

View Article and Find Full Text PDF

1. The aim of the present study was to investigate the possibility that, in the two cell lines examined, alterations in cell growth caused by lipophilic quaternary ions may involve KATP channels. We examined the effect of tetraphenylphosphonium (TPP), tetraphenylboron (TPB), rhodamine 123, dequalinium chloride (DECA) and the non-quaternary ion cisplatin on the proliferation of L1210 mouse leukaemia cells and rat smooth muscle cells in vitro.

View Article and Find Full Text PDF

1. This study examined the role of protein kinase C (PKC) on the action of transforming growth factor-beta 1 (TGF-beta 1) to regulate the proliferation of vascular smooth muscle cells (VSMC) isolated from the aorta of the spontaneously hypertensive rat (SHR). 2.

View Article and Find Full Text PDF

1. Transforming growth factors-beta (TGF-beta) are multifunctional proteins that regulate cell growth, differentiation, migration and extracellular matrix production and have an important role in embryonic development and tissue remodelling. 2.

View Article and Find Full Text PDF
TGF-beta: receptors and cell cycle arrest.

Mol Cell Endocrinol

February 1996

Transforming growth factor-beta (TGF-beta) is the prototypic member of a superfamily of proteins important in normal growth and development. The recent molecular cloning and characterization of TGF-beta receptors represents a major advance in our understanding of the mechanism of action of this cytokine. These studies have revealed that TGF-beta elicits its diverse biological responses following the formation of a heteromeric complex involving two distantly related transmembrane serine/threonine kinases, both of which are required for signalling.

View Article and Find Full Text PDF

Objective: To investigate the developmental regulation of transforming growth factor-beta 1 (TGF-beta 1) action and the expression of TGF-beta receptors in vascular smooth muscle cells (VSMC) isolated from spontaneously hypertensive rats (SHR).

Design: TGF-beta 1 effects on proliferation and expression of TGF-beta receptor subtypes were compared in VSMC prepared from SHR, Wistar-Kyoto (WKY) and Sprague-Dawley rats of different ages.

Methods: TGF-beta 1 effects on platelet-derived growth factor-BB (PDGF-BB)-stimulated proliferation were examined in VSMC isolated from SHR, WKY and Sprague-Dawley rats aged 1, 4 and 12 weeks, and from renal hypertensive WKY rats.

View Article and Find Full Text PDF

The effects of modulation of rabbit aortic smooth muscle cells (SMCs) from the 'contractile' phenotype on surface membrane receptors binding epidermal growth factor (EGF), basic fibroblast growth factor (bFGF) and platelet-derived growth factor-BB (PDGF-BB), as well as their responsiveness to these growth factors was investigated in cell culture. Cells predominantly of the 'contractile' phenotype expressed low numbers of high affinity EGF and bFGF receptors (EGFr: 1.09 +/- 0.

View Article and Find Full Text PDF

Wing bud removal in chick embryos has been shown to affect the generation of sympathetic neurons prior to the normal period of limb innervation [Saltis and Rush (1995) J. auton. nerv.

View Article and Find Full Text PDF

Both glucocorticoids and mineralocorticoids are involved in circulatory homoeostasis and blood pressure control. In recent years direct effects of both steroid classes on vascular smooth muscle cells (VSMC) have been reported. We have thus examined the effects of RU 28362, a pure glucocorticoid agonist, and aldosterone, the physiologic mineralocorticoid, on the binding to VSMC from spontaneously hypertensive rats (SHR) of two key vasoactive peptides, endothelin-1 and angiotensin II.

View Article and Find Full Text PDF

Sympathetic neuron numbers in four brachial paravertebral ganglia (segments 13-16) were quantified during normal development and following wing bud removal. In ganglia with an intact peripheral field, different developmental profiles were observed. In particular, a period of increasing neuron numbers was seen in some, but not all ganglia from embryonic day 10.

View Article and Find Full Text PDF

Transforming growth factor-beta 1 (TGF-beta 1) is a multifunctional cytokine capable of regulating the growth and differentiation of many cell types, as well as regulating their environment in the blood vessel wall. Its production by endothelium and/or vascular smooth muscle is stimulated by biophysical forces, growth factors and also vasoconstrictors. In hypertension TGF-beta 1 gene transcription is most likely elevated by a combination of physical and chemical stimuli with the cytokine acting to increase the production of extracellular matrix proteins or to modulate smooth muscle cellular growth, producing hypertrophy, polyploidy or proliferation.

View Article and Find Full Text PDF

Cultured vascular smooth muscle cells derived from the spontaneously hypertensive rat (SHR) are known to replicate more rapidly than cells from the normotensive Wistar-Kyoto (WKY) rat. In this study we compared the responses of vascular smooth muscle cells from the two strains to transforming growth factor-beta 1 (TGF-beta 1) and evaluated its potential to account for the different growth properties of these cells in response to a number of vascular-derived growth factors. TGF-beta 1 potentiated the proliferative effects of epidermal growth factor, basic fibroblast growth factor, or the different isoforms of platelet-derived growth factor on vascular smooth muscle cells from SHR but inhibited growth factor-stimulated proliferation of vascular smooth muscle cells from WKY rats.

View Article and Find Full Text PDF

1. This study examined the effects of transforming growth factor-beta 1 (TGF-beta 1) on platelet-derived growth factor-BB (PDGF-BB)-stimulated proliferation of vascular smooth muscle cells (VSMC) isolated from aortic tissue of 1, 4 and 12 week old spontaneously hypertensive rats (SHR). 2.

View Article and Find Full Text PDF

1. This study examined the effects of transforming growth factor-beta 1 (TGF-beta 1) on platelet-derived growth factor-BB (PDGF-BB)-stimulated DNA synthesis, [125I]-PDGF-BB receptor binding and PDGF-beta receptor mRNA expression in vascular smooth muscle cells (VSMC) isolated from Wistar-Kyoto (WKY) rats and spontaneously hypertensive rats (SHR). 2.

View Article and Find Full Text PDF

Objective: To investigate whether the differences in the growth properties between vascular smooth muscle cells (VSMC) from spontaneously hypertensive rats (SHR) and normotensive Wistar-Kyoto (WKY) rats depend on the type and nature of the growth factor.

Design: The growth characteristics of VSMC from SHR and WKY rats were compared in the presence of different growth factors. These were related to growth factor receptor expression on the VSMC.

View Article and Find Full Text PDF

1. This study examined and compared the actions of transforming growth factor-beta 1 (TGF-beta 1), heparin, dexamethasone and interferon-gamma on platelet-derived growth factor-BB (PDGF-BB)-stimulated proliferation of vascular smooth muscle cells (VSMC) from normotensive, Wistar-Kyoto (WKY) rats and spontaneously hypertensive rats (SHR). 2.

View Article and Find Full Text PDF

1. This study examined and compared the growth characteristics of vascular smooth muscle cells (VSMC) isolated from 4 and 12 week old spontaneously hypertensive rats (SHR) and Wistar-Kyoto (WKY) rats following stimulation with platelet-derived growth factor-BB (PDGF-BB). 2.

View Article and Find Full Text PDF

We examined the mechanisms by which Ca2+ channel antagonists inhibit the growth of smooth muscle cells by determining their effect on epidermal growth factor (EGF)-stimulated (i) induction of the early signalling gene, c-fos, (ii) incorporation of [3H]thymidine into cells as a measure of DNA synthesis, and (iii) increase in cell number. Verapamil, diltiazem, and the dihydropyridines felodipine, MDL 72892 A-15 (MDL) and nisoldipine had no effect on EGF-stimulated c-fos mRNA induction. Furthermore, only small inhibitory effects were observed on EGF-stimulated increases in cell number; felodipine, MDL, and nisoldipine at 0.

View Article and Find Full Text PDF

We have examined the interactions between transforming growth factor-beta 1 (TGF-beta 1) and epidermal growth factor (EGF), basic fibroblast growth factor (bFGF), or platelet-derived growth factor (PDGF) isoforms PDGF-AB and PDGF-BB on the proliferation of vascular smooth muscle cells isolated from the spontaneously hypertensive rat. TGF-beta 1 alone stimulated [3H]thymidine incorporation approximately twofold without a corresponding increase in cell number. In combination, TGF-beta 1 action was synergistic in further stimulating both DNA synthesis and cell proliferation 100-300% above the responses elicited by each growth factor.

View Article and Find Full Text PDF

Objective: To gain insight into the mechanisms which contribute to the development of vascular hypertrophy in the spontaneously hypertensive rat (SHR).

Design: These experiments were performed under conditions which most closely mimic the growth of smooth muscle in blood vessels, i.e.

View Article and Find Full Text PDF

1. This study has examined and compared the time-course of action of transforming growth factor-beta 1 (TGF-beta 1) on platelet-derived growth factor-BB-stimulated proliferation of vascular smooth muscle cells isolated from normotensive Wistar-Kyoto (WKY) rats and spontaneously hypertensive rats (SHR). 2.

View Article and Find Full Text PDF

The acute effects of insulin, adenosine, and isoproterenol on the activity, subcellular distribution, and phosphorylation state of the GLUT4 glucose transporter isoform were investigated in rat adipocytes under conditions carefully controlled to monitor changes in cAMP-dependent protein kinase (A-kinase) activity. In contrast to GLUT1, which has not been shown to be phosphorylated even when cells are exposed to any of the above agents, GLUT4 was partially phosphorylated (0.1-0.

View Article and Find Full Text PDF

1. In tissue culture the growth characteristics of aortic smooth muscle cells isolated from spontaneously hypertensive rats (SHR) were compared with those of normotensive Wistar-Kyoto (WKY) rats. 2.

View Article and Find Full Text PDF

The possible role of protein kinase C in the regulation of glucose transport in the rat adipose cell has been examined. Both insulin and phorbol 12-myristate 13-acetate (PMA) stimulate 3-O-methylglucose transport in the intact cell ein association with the subcellular redistribution of glucose transporters from the low density microsomes to the plasma membranes, as assessed by cytochalasin B binding. In addition, the actions of insulin and PMA on glucose transport activity and glucose transporter redistribution are additive.

View Article and Find Full Text PDF