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White DM, Takeda T, DeGroot LJ, Stefansson K, Arnason BG. Beta-trace gene expression is regulated by a core promoter and a distal thyroid hormone response element. J Biol Chem 1997; 272:14387-93. [PMID: 9162076 DOI: 10.1074/jbc.272.22.14387] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
We isolated and characterized the human beta-Trace protein (betaTP) gene promoter. betaTP, also known as prostaglandin D2 synthase, is a lipocalin secreted from the choroid plexus and meninges into cerebrospinal fluid. Basal transcription of the betaTP gene is directed from a core promoter found within the first 325 bases of the 5'-flanking sequence. The betaTP gene promoter is responsive to thyroid hormone (3,3',5-triiodothyronine, T3) and efficiently repressed by unliganded human thyroid hormone receptor beta (TRbeta). Functional analysis of the betaTP promoter in TE671 cells revealed that responsiveness to T3 occurs in sequences 2.5 kilobase pairs 5' of the start site. Within the hormone-responsive region we identified a thyroid hormone response element (TRE) located from -2576 to -2562 base pairs relative to the transcription start site. The betaTP TRE is composed of two directly repeated consensus half-sites separated by a 3-base pair space (DR3). The betaTP TRE forms specific complexes with TRbeta. We have shown that a gene active in the choroid plexus and meninges is responsive to T3. T3 may play a role in the regulated transport of substances into the cerebrospinal fluid and ultimately the brain.
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Tong L, Pav S, White DM, Rogers S, Crane KM, Cywin CL, Brown ML, Pargellis CA. A highly specific inhibitor of human p38 MAP kinase binds in the ATP pocket. NATURE STRUCTURAL BIOLOGY 1997; 4:311-6. [PMID: 9095200 DOI: 10.1038/nsb0497-311] [Citation(s) in RCA: 324] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The crystal structure of human p38 mitogen-activated protein (MAP) kinase in complex with a potent and highly specific pyridinyl-imidazole inhibitor has been determined at 2.0 A resolution. The structure of the kinase, which is in its unphosphorylated state, is similar to that of the closely-related ERK2. The inhibitor molecule is bound in the ATP pocket. A hydrogen bond is made between the pyridyl nitrogen of the inhibitor and the main chain amido nitrogen of residue 109, analogous to the interaction from the N1 atom of ATP. The crystal structure provides possible explanations for the specificity of this class of inhibitors. Other protein kinase inhibitors may achieve their specificity through a similar mechanism. The structure also reveals a possible second binding site for this inhibitor, with currently unknown function.
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Abstract
In normal animals, spinal administration of neuropeptide Y induces analgesia to thermal stimuli, but has no effect on mechanical thresholds. Recent anatomical studies, however, have shown that following nerve injury there is an altered expression of neuropeptide Y and its receptors. The aim of this behavioural study, therefore, is to examine the effect of intrathecal administration of neuropeptide Y, its agonists and an antagonist on mechanical nociceptive thresholds in rats with partial injury to the sciatic nerve. Test agents were administered for 14 days via osmotic pumps (0.5 microliter/day) attached to intrathecal catheters and the nociceptive flexion reflex was quantified using an Ugo Basile Analgesymeter. Partial injury to the sciatic nerve, in animals treated intrathecally with saline, induces a significant decrease in mechanical threshold as compared to the sham operated, contralateral paw. The nerve injury-induced hyperalgesia is exacerbated by 2 microM neuropeptide Y and by 2 microM [Leu31,Pro34]-neuropeptide Y, a Y1 receptor agonist. The Y2 receptor agonist, N-acetyl-[Leu28,Leu31]-neuropeptide Y24-36 (2 microM), had no effect on the nerve injury-induced hyperalgesia. The putative neuropeptide Y antagonist, alpha-trinositol (10 microM), significantly attenuated the nerve injury-induced hyperalgesia. This study suggests that neuropeptide Y may contribute to nerve injury-induced mechanical hyperalgesia via the Y1 receptor and provides further insight into the possible mechanisms underlying nerve injury-induced hyperalgesia to mechanical stimuli.
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White DM. Suspension of nurse who gave drug on consultant's instructions. What has happened to clinical freedom? BMJ (CLINICAL RESEARCH ED.) 1997; 314:299. [PMID: 9022499 PMCID: PMC2125742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Pav S, White DM, Rogers S, Crane KM, Cywin CL, Davidson W, Hopkins J, Brown ML, Pargellis CA, Tong L. Crystallization and preliminary crystallographic analysis of recombinant human P38 MAP kinase. Protein Sci 1997; 6:242-5. [PMID: 9007996 PMCID: PMC2143505 DOI: 10.1002/pro.5560060126] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The recombinant human p38 MAP kinase has been expressed and purified from both Escherichia coli and SF9 cells, and has been crystallized in two forms by the hanging drop vapor diffusion method using PEG as precipitant. Both crystal forms belong to space group P2(1)2(1)2(1). The cell parameters for crystal form 1 are a = 65.2 A, b = 74.6 A and c = 78.1 A. Those for crystal form 2 are a = 58.3 A, b = 68.3 A and c = 87.9 A. Diffraction data to 2.0 A resolution have been collected on both forms.
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White DM, Polson DW, Kiddy D, Sagle P, Watson H, Gilling-Smith C, Hamilton-Fairley D, Franks S. Induction of ovulation with low-dose gonadotropins in polycystic ovary syndrome: an analysis of 109 pregnancies in 225 women. J Clin Endocrinol Metab 1996; 81:3821-4. [PMID: 8923819 DOI: 10.1210/jcem.81.11.8923819] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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White DM, Mansfield K. Vasoactive intestinal polypeptide and neuropeptide Y act indirectly to increase neurite outgrowth of dissociated dorsal root ganglion cells. Neuroscience 1996; 73:881-7. [PMID: 8809806 DOI: 10.1016/0306-4522(96)00055-3] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Recent studies suggest that rearrangement of synaptic circuitry of primary afferent neurons in the spinal cord may contribute, in part, to hyperalgesia that is often associated with peripheral nerve injury. This study of cultured adult rat dorsal root ganglion cells examined whether vasoactive intestinal polypeptide and neuropeptide Y, which are up-regulated in sensory neurons following nerve transection, possibly contribute to the morphological alterations induced by nerve injury. Neurite outgrowth of dissociated dorsal root ganglion cells was examined two weeks following either sciatic nerve transection or intrathecal administration of test agents via osmotic pumps. Dissociated cells taken from rats with transected sciatic nerve or following intrathecal administration of either vasoactive intestinal polypeptide or neuropeptide Y had a significant increase in the percentage of cells with neurites as compared to dorsal root ganglion cells taken from normal animals. Intrathecal administration, into rats with nerve lesion, of the vasoactive intestinal polypeptide and neuropeptide Y antagonists, vasoactive intestinal polypeptide(10-28) and alpha-trinositol, respectively, significantly attenuated the nerve injury-induced increase in neurite outgrowth. Vasoactive intestinal polypeptide and neuropeptide Y had no influence on neurite outgrowth when applied to normal dissociated dorsal root ganglion cells, however, when added to cells co-cultured with spinal cord explants, both peptides significantly increased the percentage of cells with neurites. K252a, a protein kinase inhibitor, attenuated the trophic action of neuropeptide Y, but not that of vasoactive intestinal polypeptide. The action of vasoactive intestinal polypeptide on neurite outgrowth was attenuated by the protein kinase A inhibitor, the Rp-isomer of adenosine-3',5'-cyclic monophosphorothioate. The results suggest that the peptides may contribute, indirectly, to the nerve injury-induced increase in neurite outgrowth of sensory neurons via separate spinally-derived neurotrophic factors and the study provides further insight into the possible mechanisms underlying hyperalgesia associated with nerve injury.
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White DM, Mansfield K, Kelleher K. Increased neurite outgrowth of cultured rat dorsal root ganglion cells following transection or inhibition of axonal transport of the sciatic nerve. Neurosci Lett 1996; 208:93-6. [PMID: 8859898 DOI: 10.1016/0304-3940(96)12554-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Dissociated dorsal root ganglion cells (DRGs), taken from rats 2 weeks after sciatic nerve transection, have an increase in the percentage of cells with neurites compared to DRGs taken from normal animals. This study examines the possible factors that may contribute to the nerve injury-induced increase in neuritogenesis. Topical application of the local anaesthetic, bupivicaine, either to the nerve trunk prior to transection or to the proximal nerve stump for 2 weeks had no effect on the increased neurite outgrowth induced by nerve transection. Neurite outgrowth was also not influenced by administration of either nerve growth factor (NGF) via the femoral artery into normal rats or anti-NGF antiserum to the proximal nerve stump. Inhibition of axonal transport by topical application of vinblastine, however, induced a significant increase in neurite outgrowth compared to untreated controls. In addition, vinblastine-treated animals also develop hyperalgesia to mechanical stimulation and transganglionic labelling of sensory neurons with choleragenoid-horseradish peroxidase shows that the area of termination of myelinated sensory neurons in the spinal cord expands into lamina II. The results suggest that nerve injury-induced increase in neurite outgrowth is not dependent on NGF nor nerve impulses generated at the site of injury and supports the view that the absence of an inhibitory factor(s), that in normal animals may regulate neuronal outgrowth.
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MESH Headings
- Anesthetics, Local/pharmacology
- Animals
- Antineoplastic Agents, Phytogenic/pharmacology
- Axonal Transport/drug effects
- Axonal Transport/physiology
- Axons/physiology
- Bupivacaine/pharmacology
- Cells, Cultured/drug effects
- Cells, Cultured/physiology
- Cells, Cultured/ultrastructure
- Ganglia, Spinal/cytology
- Horseradish Peroxidase
- Male
- Nerve Fibers, Myelinated/physiology
- Nerve Growth Factors/pharmacology
- Neurites/physiology
- Neurons, Afferent/drug effects
- Neurons, Afferent/physiology
- Neurons, Afferent/ultrastructure
- Nociceptors/drug effects
- Nociceptors/physiology
- Rats
- Rats, Wistar
- Sciatic Nerve/cytology
- Vinblastine/pharmacology
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Kousta E, White DM, Piazzi A, Loumaye E, Franks S. Successful induction ovulation and completed pregnancy using recombinant human luteinizing hormone and follicle stimulating hormone in a woman with Kallmann's syndrome. Hum Reprod 1996; 11:70-1. [PMID: 8671160 DOI: 10.1093/oxfordjournals.humrep.a019039] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The induction of ovulation in women with hypogonadotrophic hypogonadism requires follicle stimulating hormone (FSH) for follicular growth and both FSH and luteinizing hormone (LH) to induce optimal follicular steroidogenesis. The development of human recombinant FSH and LH means that individually tailored doses of both hormones can be used with the aim of inducing unifollicular ovulation. This report describes the use of recombinant human FSH and LH for the induction of ovulation and conception in the second cycle of treatment, and subsequently a successfully completed pregnancy in a woman with Kallmann's syndrome.
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Abstract
Hyperalgesia (tenderness) is a prominent feature of the inflammatory response. It is thought to be mediated, in part, by humoral factors such as prostaglandin E2, which act directly to sensitize primary afferent nociceptors. Prostaglandin E2 also interacts with nociceptors to induce a release of substance P, which can feed back to enhance the inflammatory response and also induce a long-lasting hyperalgesia. This study examined the mechanism of prostaglandin E2-induced substance P release from cultured adult rat dorsal root ganglion cells. Release studies were performed by bathing cultures with Tyrode solution +/- test agents and substance P was measured by radioimmunoassay. Substance P release induced by 100 nM prostaglandin E2 was inhibited by the prostaglandin antagonist, SC19220, and modulated by the guanine nucleotide analogs, guanosine-5'-[gamma-thio]triphosphate and guanosine-5'-[beta-thio]diphosphate, which stimulate and inhibit, respectively, stimulatory G-proteins. Substance P release was found to be Ca(2+)-dependent, requiring an influx of Ca2+ via N-type voltage-sensitive Ca2+ channels, since it was blocked by omega-conotoxin, but not nifedipine. The results suggest that prostaglandin E2 acts via a G-protein-coupled binding site on dissociated dorsal root ganglion cells to induce a Ca(2+)-dependent release of substance P, and provide further insight into the possible mechanisms underlying hyperalgesia associated with inflammation.
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White DM. Commitment to clinical education. Phys Ther 1995; 75:1139-40. [PMID: 7501714 DOI: 10.1093/ptj/75.12.1139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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White DM, Crolla JA, Ross FM. Detection of minimal residual disease in childhood acute lymphoblastic leukaemia using fluorescence in-situ hybridization. Br J Haematol 1995; 91:1019-24. [PMID: 8547114 DOI: 10.1111/j.1365-2141.1995.tb05428.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Using centromere-specific probes and a fluorescence in-situ hybridization (FISH) technique in cases of childhood hyperdiploid acute lymphoblastic leukaemia (ALL), cells with extra copies of chromosomes can be differentiated from normal cells by their extra signals in both metaphase and interphase nuclei. In this way the entire cell population, not only those cells in division, can be analysed, thereby providing a valuable technique not only for determining leukaemia cell karyotype at diagnosis but also for the detection of minimal residual disease (MRD). We have conducted 161 analyses of remission bone marrow aspirates (BMs) in 13 children with hyperdiploid ALL. Slides were analysed blind and in parallel to 35 control samples. Control BMs showed very low numbers of trisomic cells (mean +/- 2 x SD = 0.13 +/- 0.34%). MRD was detected in 5/13 cases of ALL investigated while on chemotherapy. One out of five newly diagnosed cases and all three relapse cases of ALL had significantly raised levels of hyperdiploid cells in day 28 BMs. The presence of detectable disease in day 28 BMs suggests the need for larger studies to find whether this data is of prognostic value.
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White DM, Pillers DA, Reiss JA, Brown MG, Magenis RE. Interstitial deletions of the short arm of chromosome 4 in patients with a similar combination of multiple minor anomalies and mental retardation. AMERICAN JOURNAL OF MEDICAL GENETICS 1995; 57:588-97. [PMID: 7573135 DOI: 10.1002/ajmg.1320570415] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Interstitial deletions of chromosome 4 have been described rarely and have had variable presentations. We describe the phenotypic characteristics associated with interstitial deletion of the p14-16 region of chromosome 4 in 7 patients with multiple minor anomalies in common, and with mental retardation. A review of published cases of interstitial deletions of the short arm of chromosome 4 is provided. These deletions present a distinct phenotype which is different from that of Wolf-Hirschhorn syndrome.
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Watson AH, Kanny EM, White DM, Anson DK. Use of standardized activities of daily living rating scales in spinal cord injury and disease services. Am J Occup Ther 1995; 49:229-34. [PMID: 7741156 DOI: 10.5014/ajot.49.3.229] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
OBJECTIVE Although standardized activities of daily living (ADL) rating scales offer advantages in reliability and consistency of reporting, the literature has revealed that most occupational therapists tend to use informal assessments and reporting methods. This study investigated the use of standardized ADL rating scales by occupational therapists who treat patients with spinal cord injury and disease (SCI/D). METHOD Fifty-two SCI/D rehabilitation sites were selected by stratified random sampling, and surveys were completed by the occupational therapist in each site who worked most extensively with patients with SCI/D: Occupational therapists at 49 of the sites completed the survey. RESULTS Survey results indicated that 68% of the respondents tend not to use standardized ADL rating scales in their work with SCI/D patients. Of those who used standardized ADL rating scales, the Functional Independence Measure (FIM) was more widely used than any other. Most respondents learned about this measure on the job. Many of the respondents indicated that a limitation of the FIM was its inability to detect progress in their patients with SCI/D: DISCUSSION The results indicate that although widely used, the FIM may need to be supplemented by other standardized ADL rating scales in order for a therapist to objectively document the progress made by patients with SCI/D: To be able to choose the most appropriate assessment tools, students and practicing therapists need to be educated in a variety of standardized ADL rating scales.
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Griffiths S, McWilliam J, White DM, MacFarlane A, Hicks N. Secrecy in the NHS. Public health advocacy will remain. BMJ (CLINICAL RESEARCH ED.) 1995; 310:191. [PMID: 7833772 PMCID: PMC2548578 DOI: 10.1136/bmj.310.6973.191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Gold MS, White DM, Ahlgren SC, Guo M, Levine JD. Catecholamine-induced mechanical sensitization of cutaneous nociceptors in the rat. Neurosci Lett 1994; 175:166-70. [PMID: 7970201 DOI: 10.1016/0304-3940(94)91105-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
C-Fiber mechanoheat (C-MH) nociceptors from the saphenous nerve were studied, in control rats and in rats that underwent surgical sympathectomy. Intradermal injection, alone, of either norepinephrine (NE) or the calcium ionophore, A23187, did not affect mechanical threshold. The combination of A23187 and NE, however, significantly decreased mechanical threshold. In the presence of the alpha 2-adrenergic antagonist, yohimbine, or the cyclooxygenase inhibitor, indomethacin, C-MHs were not sensitized by the combination of NE + A23187. One week after surgical sympathectomy, the number of C-MHs sensitized by NE + A23187 was significantly reduced. In summary, NE appears to sensitize nociceptors indirectly. These data are compatible with the suggestion that a sympathetic postganglionic neuron-dependent release of prostaglandins mediates the sensitization. NE appears to act at an alpha 2-adrenergic receptor, only in the presence of an increased intracellular Ca2+.
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White DM, Smith AG, Smith JL. Assessment of proliferative activity in leukaemic bone marrow using the monoclonal antibody Ki-67. J Clin Pathol 1994; 47:209-13. [PMID: 8163690 PMCID: PMC501896 DOI: 10.1136/jcp.47.3.209] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
AIMS To investigate proliferative activity in leukaemic and lymphomatous bone marrow infiltrates and to assess the feasibility of transport of specimens among institutions. METHODS Proliferative activity in bone marrow trephine cryosections from 99 patients with non-Hodgkin's lymphoma (NHL), 23 patients with acute myeloid leukaemia (AML), 11 with acute lymphoblastic leukaemia (ALL), and two with acute undifferentiated leukaemia (AUL) was investigated. Infiltration was seen in 52 out of 99 cases of NHL on bone marrow cryosections. A score was devised to assess pathological infiltrates in bone marrow trephine cryosections using the monoclonal antibody Ki-67. This method of scoring gave a measure of non-erythroid proliferative activity. RESULTS Mean Ki-67 positivity in bone marrow infiltrates in 31 low grade B cell lymphomas (Kiel classification) was 0.3% before and 4.7% after treatment, 16.4% in seven high grade B cell lymphomas, and 17.8% in 12 peripheral T cell lymphomas. In 48 cases of NHL, bone marrow cryosections had not been infiltrated, and in all but one case the percentage of Ki-67 positive cells in normal marrow was less than 3%; the remaining case showed coexistent myelodysplasia and 8% bone marrow Ki-67 positivity. In eight cases of common ALL at diagnosis, the mean Ki-67 positivity in marrow cryosections was 24.9%, significantly higher than the 2.4% Ki-67 positivity seen in AML (p < 0.05). One of the two cases of common ALL with less than 1% Ki-67 positivity was refractory to treatment. CONCLUSIONS Proliferative activity of erythroid elements in the bone marrow varies greatly. Immunostaining of bone marrow cryosections using Ki-67 permits accurate assessment of non-erythroid proliferative activity in lymphomas and leukaemia. High grade B cell lymphomas and peripheral T cell lymphomas invading the marrow have very similar mean proliferative activities. Such levels of proliferation are of the same order as those seen in common ALL, but much higher than those seen in AML.
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Kasuya H, Weir BK, White DM, Stefansson K. Mechanism of oxyhemoglobin-induced release of endothelin-1 from cultured vascular endothelial cells and smooth-muscle cells. J Neurosurg 1993; 79:892-8. [PMID: 7504096 DOI: 10.3171/jns.1993.79.6.0892] [Citation(s) in RCA: 84] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Release of endothelin-1 from cultured endothelial cells can be induced with oxyhemoglobin (oxyHb). The present study was conducted to explore whether oxyHb affects the release of endothelin-1 and the induction of endothelin-1 messenger ribonucleic acid (mRNA) and to examine the mechanism whereby oxyHb induces endothelin-1 production in cultured vascular smooth-muscle cells as well as in cultured endothelial cells. Oxyhemoglobin produces concentration-dependent (0.1 to 10 microM) and time-dependent (0 to 24 hours) increases in immunoreactive endothelin-1 in conditioned medium from bovine arterial endothelial cells. Oxyhemoglobin induces immunoreactive endothelin-1 in rat aortic smooth-muscle cells in the same fashion, although the rate is 30-fold less than that of endothelial cells. This promoting effect is much higher than that of other stimulators such as thrombin and phorbol 12-myristate 13-acetate. Northern blot analysis of total RNA from endothelial cells also showed endothelin-1 mRNA induction. Staurosporine, a protein kinase C (PKC) inhibitor, inhibited oxyHb-induced endothelin-1 production in both vascular endothelial and smooth-muscle cells, whereas an increase of intracellular cyclic adenosine monophosphate (cAMP) by forskolin or an addition of 8-bromo-cAMP only inhibited this effect in smooth-muscle cells. These findings suggest that oxyHb-induced endothelin-1 production in endothelial cells is regulated by PKC, and in smooth-muscle cells by both PKC and the cAMP-dependent pathway. The production of endothelin, the most potent vasoconstrictor, in both vascular endothelial and smooth-muscle cells by oxyHb may have significance in the pathogenesis of cerebral vasospasm.
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MESH Headings
- 8-Bromo Cyclic Adenosine Monophosphate/pharmacology
- Alkaloids/pharmacology
- Animals
- Blotting, Northern
- Cattle
- Cells, Cultured
- Colforsin/pharmacology
- Dose-Response Relationship, Drug
- Endothelins/genetics
- Endothelins/metabolism
- Endothelium, Vascular/chemistry
- Endothelium, Vascular/drug effects
- Endothelium, Vascular/metabolism
- Methemoglobin/pharmacology
- Muscle, Smooth, Vascular/chemistry
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Oxyhemoglobins/pharmacology
- Oxyhemoglobins/physiology
- Protein Kinase C/antagonists & inhibitors
- RNA/analysis
- RNA, Messenger/analysis
- Rats
- Reference Values
- Staurosporine
- Thrombin/pharmacology
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White DM. PTA supervision. Phys Ther 1993; 73:809. [PMID: 8234461 DOI: 10.1093/ptj/73.11.809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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White DM. When tomorrow came.... Am J Hosp Palliat Care 1993; 10:13-6. [PMID: 7691123 DOI: 10.1177/104990919301000507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
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White DM. Comparison of closed and open kinetic chain exercise in the anterior cruciate ligament-deficient knee. Am J Sports Med 1993; 21:633; author reply 633-4. [PMID: 8368430 DOI: 10.1177/036354659302100429] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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47
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48
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White DM, Catanzaro ML, Kraft GH. An Approach to the Psychological Aspects of Multiple Sclerosis: A Coping Guide for Healthcare Providers and Families. Neurorehabil Neural Repair 1993. [DOI: 10.1177/136140969300700201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Ahlgren SC, White DM, Levine JD. Increased responsiveness of sensory neurons in the saphenous nerve of the streptozotocin-diabetic rat. J Neurophysiol 1992; 68:2077-85. [PMID: 1491258 DOI: 10.1152/jn.1992.68.6.2077] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
1. This study examined sensory neurons in the saphenous nerve of rats treated with streptozotocin to induce diabetes (STZ-D). Several physiological properties of sensory neurons were not significantly different in STZ-D compared with control (CON) rats, including percentage and rate of spontaneous activity seen in the whole nerve and mechanical and thermal thresholds of individual C-fibers. 2. The response of STZ-D and CON C-fibers to a sustained (1 min) mechanical stimulus of threshold force was similar. However, during the 5 min immediately after removal of this stimulus, there was a much greater afterdischarge in STZ-D rats (STZ-D: n = 35; 14.6 +/- 5.1 action potentials/5 min, mean +/- SE; CON: n = 34; 3.9 +/- 0.7 action potentials/5 min). The number of action potentials during a sustained (1 min) suprathreshold mechanical (445 g) stimulus was also significantly greater in the C-fibers from STZ-D rats (STZ-D: n = 44; 149.7 +/- 18.4 action potentials; CON: n = 45; 84.7 +/- 12.2 action potentials). The afterdischarge during the 5 min immediately after removal of the sustained suprathreshold stimulus was also greater in C-fibers from STZ-D rats (STZ-D: 38.7 +/- 13.1 action potentials/5 min; CON: 9.3 +/- 2.3 action potentials/5 min). 3. There was a significant difference between C-fibers from STZ-D and CON rats with respect to the distribution among certain sensory classes.(ABSTRACT TRUNCATED AT 250 WORDS)
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White DM, Mikol DD, Espinosa R, Weimer B, Le Beau MM, Stefansson K. Structure and chromosomal localization of the human gene for a brain form of prostaglandin D2 synthase. J Biol Chem 1992; 267:23202-8. [PMID: 1385416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
We have cloned and characterized the human gene for the 21-kDa brain form of prostaglandin D2 synthase. The gene was isolated from a human genomic lambda library and spans 3600 base pairs. It consists of seven exons and six introns. Southern blot analysis indicates that there is a single copy of the gene in the haploid genome. The transcriptional start site was mapped to a G residue 74 base pairs 5' of the ATG initiation codon. A TATA box-like element (ATAAATA) is situated 21 base pairs upstream of the mRNA start site. The gene was mapped to chromosome 9 bands q34.2-q34.3. The gene bears close resemblance to the genes for murine major urinary protein and ovine beta-lactoglobulin.
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