151
|
Choudhury G, Wang L, Pierce J, Harvey S, Sakaguchi A. A mutational analysis of phosphatidylinositol-3-kinase activation by human colony-stimulating factor-1 receptor. J Biol Chem 1991. [DOI: 10.1016/s0021-9258(18)92941-8] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
|
152
|
Bonvini E, Debell KE, Taplits MS, Brando C, Laurenza A, Seamon K, Hoffman T. A role for guanine-nucleotide-binding proteins in mediating T-cell-receptor coupling to inositol phospholipid hydrolysis in a murine T-helper (type II) lymphocyte clone. Biochem J 1991; 275 ( Pt 3):689-96. [PMID: 1645519 PMCID: PMC1150204 DOI: 10.1042/bj2750689] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Perturbation of the T-cell receptor (TCR) complex is followed by the rapid hydrolysis of inositol phospholipids (InsPL) by phospholipase C (PLC), producing diacylglycerol and inositol phosphates, which act as second messengers in signal transduction. The mechanism coupling the TCR to InsPL hydrolysis is not clearly defined, and no information is available on this mechanism in the CD4+ helper subset of T-lymphocytes (Th). We have tested the hypothesis that guanine-nucleotide-binding proteins (G-proteins) may couple the TCR to PLC in a murine Th type II (Th2) cell clone. Cell permeabilization with streptolysin O (SLO) or tetanolysin (TL) was used to allow membrane-impermeable nucleotides access to intracellular sites of action. Exposure of permeabilized Th2 cells to guanosine 5'-[gamma-thio]triphosphate (GTP gamma S), a non-hydrolysable GTP analogue, resulted in a 2.1-2.5-fold increase in inositol phosphate generation. Similarly, perturbation of the TCR with the monoclonal antibody 145.2C11 (directed against the epsilon-chain of the CD3 component of the TCR) resulted in a 3.1-4.2-fold increase in InsPL hydrolysis by permeabilized cells. Both lysins were similarly effective in allowing GTP gamma S induction of InsPL hydrolysis, but TL-permeabilized cells responded better to TCR perturbation than SLO-treated cells. A role for G-proteins in TCR coupling to PLC was further supported by the inhibition of TCR-induced InsPL hydrolysis by guanosine 5'-[beta-thio]diphosphate (GDP beta S), a guanine nucleotide analogue that inhibits G-protein function. ATP was required for TCR-mediated InsPL hydrolysis, and potentiated GTP gamma S-induced hydrolysis. Other nucleotides (i.e. CTP, GDP, GTP, ITP) did not affect the response. These data indicate that G-proteins may contribute to the regulation of PLC activation in Th2 cells, coupling it to the TCR.
Collapse
Affiliation(s)
- E Bonvini
- Laboratory of Cell Biology, U.S. Food and Drug Administration, Bethesda, MD 20892
| | | | | | | | | | | | | |
Collapse
|
153
|
Cell cycle tyrosine phosphorylation of p34cdc2 and a microtubule-associated protein kinase homolog in Xenopus oocytes and eggs. Mol Cell Biol 1991. [PMID: 2005892 DOI: 10.1128/mcb.11.4.1965] [Citation(s) in RCA: 232] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We have examined the time course of protein tyrosine phosphorylation in the meiotic cell cycles of Xenopus laevis oocytes and the mitotic cell cycles of Xenopus eggs. We have identified two proteins that undergo marked changes in tyrosine phosphorylation during these processes: a 42-kDa protein related to mitogen-activated protein kinase or microtubule-associated protein-2 kinase (MAP kinase) and a 34-kDa protein identical or related to p34cdc2. p42 undergoes an abrupt increase in its tyrosine phosphorylation at the onset of meiosis 1 and remains tyrosine phosphorylated until 30 min after fertilization, at which point it is dephosphorylated. p42 also becomes tyrosine phosphorylated after microinjection of oocytes with partially purified M-phase-promoting factor, even in the presence of cycloheximide. These findings suggest that MAP kinase, previously implicated in the early responses of somatic cells to mitogens, is also activated at the onset of meiotic M phase and that MAP kinase can become tyrosine phosphorylated downstream from M-phase-promoting factor activation. We have also found that p34 goes through a cycle of tyrosine phosphorylation and dephosphorylation prior to meiosis 1 and mitosis 1 but is not detectable as a phosphotyrosyl protein during the 2nd through 12th mitotic cell cycles. It may be that the delay between assembly and activation of the cyclin-p34cdc2 complex that p34cdc2 tyrosine phosphorylation provides is not needed in cell cycles that lack G2 phases. Finally, an unidentified protein or group of proteins migrating at 100 to 116 kDa increase in tyrosine phosphorylation throughout maturation, are dephosphorylated or degraded within 10 min of fertilization, and appear to cycle between low-molecular-weight forms and high-molecular-weight forms during early embryogenesis.
Collapse
|
154
|
Cooke MP, Abraham KM, Forbush KA, Perlmutter RM. Regulation of T cell receptor signaling by a src family protein-tyrosine kinase (p59fyn). Cell 1991; 65:281-91. [PMID: 2015626 DOI: 10.1016/0092-8674(91)90162-r] [Citation(s) in RCA: 325] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Engagement of the clonotypic antigen receptor (TCR) on T lymphocytes provokes an activation response leading to cell proliferation and lymphokine secretion. To examine the molecular basis of T cell signaling, we generated transgenic animals in which a lymphocyte-specific nonreceptor protein-tyrosine kinase p59fyn(T) is 20-fold overexpressed in developing T lineage cells. Thymocytes from these mice, analyzed using both cellular and biochemical assays, were remarkably hyperstimulable. Moreover, the responsiveness of normal thymocytes to TCR-derived signals correlated well with the extent to which p59fyn was expressed in these cells. Overexpression of a catalytically inactive form of p59fyn substantially inhibited TCR-mediated activation in otherwise normal thymocytes. These effects are unique to p59fyn; overexpression of a closely related T cell-specific tyrosine kinase, p56lck, elicits dramatically different phenotypes. Our results suggest that p59fyn is a critically important component of the TCR signal transduction apparatus.
Collapse
Affiliation(s)
- M P Cooke
- Howard Hughes Medical Institute, University of Washington, Seattle 98195
| | | | | | | |
Collapse
|
155
|
Stoker M, Gherardi E. Regulation of cell movement: the motogenic cytokines. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1072:81-102. [PMID: 2018780 DOI: 10.1016/0304-419x(91)90008-9] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- M Stoker
- Department of Medicine, University of Cambridge, U.K
| | | |
Collapse
|
156
|
Otsu M, Hiles I, Gout I, Fry MJ, Ruiz-Larrea F, Panayotou G, Thompson A, Dhand R, Hsuan J, Totty N. Characterization of two 85 kd proteins that associate with receptor tyrosine kinases, middle-T/pp60c-src complexes, and PI3-kinase. Cell 1991; 65:91-104. [PMID: 1707345 DOI: 10.1016/0092-8674(91)90411-q] [Citation(s) in RCA: 644] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Affinity-purified bovine brain phosphatidylinositol 3-kinase (PI3-kinase) contains two major proteins of 85 and 110 kd. Amino acid sequence analysis and cDNA cloning reveals two related 85 kd proteins (p85 alpha and p85 beta), which both contain one SH3 and two SH2 regions (src homology regions). When expressed, these 85 kd proteins bind to and are substrates for tyrosine-phosphorylated receptor kinases and the polyoma virus middle-T antigen/pp60c-src complex, but lack PI3-kinase activity. However, an antiserum raised against p85 beta immunoprecipitates PI3-kinase activity. The active PI3-kinase complex containing p85 alpha or p85 beta and the 110 kd protein binds to PDGF but not EGF receptors. p85 alpha and p85 beta may mediate specific PI3-kinase interactions with a subset of tyrosine kinases.
Collapse
Affiliation(s)
- M Otsu
- Ludwig Institute for Cancer Research, London, England
| | | | | | | | | | | | | | | | | | | |
Collapse
|
157
|
Ferrell JE, Wu M, Gerhart JC, Martin GS. Cell cycle tyrosine phosphorylation of p34cdc2 and a microtubule-associated protein kinase homolog in Xenopus oocytes and eggs. Mol Cell Biol 1991; 11:1965-71. [PMID: 2005892 PMCID: PMC359881 DOI: 10.1128/mcb.11.4.1965-1971.1991] [Citation(s) in RCA: 99] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
We have examined the time course of protein tyrosine phosphorylation in the meiotic cell cycles of Xenopus laevis oocytes and the mitotic cell cycles of Xenopus eggs. We have identified two proteins that undergo marked changes in tyrosine phosphorylation during these processes: a 42-kDa protein related to mitogen-activated protein kinase or microtubule-associated protein-2 kinase (MAP kinase) and a 34-kDa protein identical or related to p34cdc2. p42 undergoes an abrupt increase in its tyrosine phosphorylation at the onset of meiosis 1 and remains tyrosine phosphorylated until 30 min after fertilization, at which point it is dephosphorylated. p42 also becomes tyrosine phosphorylated after microinjection of oocytes with partially purified M-phase-promoting factor, even in the presence of cycloheximide. These findings suggest that MAP kinase, previously implicated in the early responses of somatic cells to mitogens, is also activated at the onset of meiotic M phase and that MAP kinase can become tyrosine phosphorylated downstream from M-phase-promoting factor activation. We have also found that p34 goes through a cycle of tyrosine phosphorylation and dephosphorylation prior to meiosis 1 and mitosis 1 but is not detectable as a phosphotyrosyl protein during the 2nd through 12th mitotic cell cycles. It may be that the delay between assembly and activation of the cyclin-p34cdc2 complex that p34cdc2 tyrosine phosphorylation provides is not needed in cell cycles that lack G2 phases. Finally, an unidentified protein or group of proteins migrating at 100 to 116 kDa increase in tyrosine phosphorylation throughout maturation, are dephosphorylated or degraded within 10 min of fertilization, and appear to cycle between low-molecular-weight forms and high-molecular-weight forms during early embryogenesis.
Collapse
Affiliation(s)
- J E Ferrell
- Department of Zoology, University of Wisconsin-Madison 53706
| | | | | | | |
Collapse
|
158
|
Carter RH, Park DJ, Rhee SG, Fearon DT. Tyrosine phosphorylation of phospholipase C induced by membrane immunoglobulin in B lymphocytes. Proc Natl Acad Sci U S A 1991; 88:2745-9. [PMID: 2011584 PMCID: PMC51315 DOI: 10.1073/pnas.88.7.2745] [Citation(s) in RCA: 138] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Ligation of membrane IgM on B lymphocytes causes activation of a protein-tyrosine kinase(s) (PTK) and of phospholipase C (PLC). To determine whether these are elements of a common signal-transduction pathway, the effect of three PTK inhibitors on the rise in intracellular free Ca2+ concentration [( Ca2+]i) in human B-lymphoblastoid cell lines was assessed. Tyrphostin completely suppressed the increase in [Ca2+]i and the generation of inositol phosphates induced by ligation of membrane immunoglobulin (mIg) M. Herbimycin and genistein reduced by 30% and 50%, respectively, the rise in [Ca2+]i caused by optimal ligation of mIgM, and they abolished it in cells activated by suboptimal ligation of mIgM. Tyrphostin had no effect on the capacity of aluminum fluoride to increase [Ca2+]i. To determine whether a function of PTK is the phosphorylation of PLC, immunoprecipitates obtained with anti-phosphotyrosine from detergent lysates of B-lymphoblastoid cells were assayed for PLC activity. Ligation of mIgM increased immunoprecipitable PLC activity 2-fold by 90 sec and 4-fold by 30 min. Specific immunoprecipitation and Western blot analysis identified tyrosine phosphorylation of the gamma 1 isoform of PLC after 60 sec of stimulation. Activation of PLC in B cells by mIgM requires PTK function and is associated with tyrosine phosphorylation of PLC-gamma 1, suggesting a mechanism of PLC activation similar to that described for certain receptor PTKs.
Collapse
Affiliation(s)
- R H Carter
- Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205
| | | | | | | |
Collapse
|
159
|
Ionic events induced by epidermal growth factor. Evidence that hyperpolarization and stimulated cation influx play a role in the stimulation of cell growth. J Biol Chem 1991. [DOI: 10.1016/s0021-9258(18)38122-5] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
|
160
|
Force T, Kyriakis JM, Avruch J, Bonventre JV. Endothelin, vasopressin, and angiotensin II enhance tyrosine phosphorylation by protein kinase C-dependent and -independent pathways in glomerular mesangial cells. J Biol Chem 1991. [DOI: 10.1016/s0021-9258(18)38166-3] [Citation(s) in RCA: 94] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
161
|
Meldrum E, Parker PJ, Carozzi A. The PtdIns-PLC superfamily and signal transduction. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1092:49-71. [PMID: 1849017 DOI: 10.1016/0167-4889(91)90177-y] [Citation(s) in RCA: 165] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- E Meldrum
- Protein Phosphorylation Laboratory, Imperial Cancer Research Fund, London, U.K
| | | | | |
Collapse
|
162
|
Goldschmidt-Clermont PJ, Kim JW, Machesky LM, Rhee SG, Pollard TD. Regulation of phospholipase C-gamma 1 by profilin and tyrosine phosphorylation. Science 1991; 251:1231-3. [PMID: 1848725 DOI: 10.1126/science.1848725] [Citation(s) in RCA: 432] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Epidermal growth factor and platelet-derived growth factor can stimulate the production of the second messenger inositol trisphosphate in responsive cells, but the biochemical pathway for these signaling events has been uncertain because the reactions have not been reconstituted with purified molecules in vitro. A reconstitution is described that requires not only the growth factor, its receptor with tyrosine kinase activity, and the soluble phospholipase C-gamma 1, but also the small soluble actin-binding protein profilin. Profilin binds to the substrate phosphatidylinositol 4,5-bisphosphate and inhibits its hydrolysis by unphosphorylated phospholipase C-gamma 1. Phosphorylation of phospholipase C-gamma 1 by the epidermal growth factor receptor tyrosine kinase overcomes the inhibitory effect of profilin and results in an effective activation of phospholipase C-gamma 1.
Collapse
Affiliation(s)
- P J Goldschmidt-Clermont
- Department of Cell Biology and Anatomy, Johns Hopkins University School of Medicine, Baltimore, MD 21205
| | | | | | | | | |
Collapse
|
163
|
Abstract
A phosphoinositide kinase specific for the D-3 position of the inositol ring, phosphatidylinositol (PI) 3-kinase, associates with activated receptors for platelet-derived growth factor, insulin, and colony-stimulating factor 1, with products of the oncogenes src, fms, yes, crk, and with polyomavirus middle T antigen. Efficient fibroblast transformation by proteins of the abl and src oncogene families requires activation of their protein-tyrosine kinase activity and membrane association via an amino-terminal myristoylation. We have demonstrated that the PI 3-kinase directly associates with autophosphorylated, activated protein-tyrosine kinase variants of the abl protein. In vivo, this association leads to accumulation of the highly phosphorylated products of PI 3-kinase, PI-3,4-bisphosphate and PI-3,4,5-trisphosphate, only in myristoylated, transforming abl protein variants. Myristoylation thus appears to be required to recruit PI 3-kinase activity to the plasma membrane for in vivo activation and correlates with the mitogenicity of the abl protein variants.
Collapse
|
164
|
Abstract
Phospholipase C is a family of cellular proteins believed to play a significant role in the intracellular signaling mechanisms utilized by diverse hormones. One class of hormones, polypeptide growth factors, elicits its influence on cellular function through stimulation of cell surface receptor tyrosine kinase activity. Certain growth factors appear to stimulate cellular phospholipase C activity by selective, receptor-mediated tyrosine phosphorylation of the phospholipase C-gamma 1 isozyme. While the role of phospholipase C activity in growth factor regulation of cell proliferation remains to be clarified, the selective growth factor-stimulated tyrosine phosphorylation and activation of phospholipase C-gamma 1 is an interesting example of enzyme-substrate interaction at the crossroads of two important intracellular signaling pathways.
Collapse
Affiliation(s)
- M Wahl
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232-0146
| | | |
Collapse
|
165
|
Smrcka AV, Hepler JR, Brown KO, Sternweis PC. Regulation of polyphosphoinositide-specific phospholipase C activity by purified Gq. Science 1991; 251:804-7. [PMID: 1846707 DOI: 10.1126/science.1846707] [Citation(s) in RCA: 695] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2) by phospholipase C yields the second messengers inositol 1,4,5-trisphosphate (InsP3) and 1,2-diacylglycerol. This activity is regulated by a variety of hormones through G protein pathways. However, the specific G protein or proteins involved has not been identified. The alpha subunit of a newly discovered pertussis toxin-insensitive G protein (Gq) has recently been isolated and is now shown to stimulate the activity of polyphosphoinositide-specific phospholipase C (PI-PLC) from bovine brain. Both the maximal activity and the affinity of PI-PLC for calcium ion were affected. These results identify Gq as a G protein that regulates PI-PLC.
Collapse
Affiliation(s)
- A V Smrcka
- Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas 75235
| | | | | | | |
Collapse
|
166
|
Phosphorylation and activation of epidermal growth factor receptors in cells transformed by the src oncogene. Mol Cell Biol 1991. [PMID: 1702513 DOI: 10.1128/mcb.11.1.309] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Because functionally significant substrates for the tyrosyl protein kinase activity of pp60v-src are likely to include membrane-associated proteins involved in normal growth control, we have tested the hypothesis that pp60v-src could phosphorylate and alter the signaling activity of transmembrane growth factor receptors. We have found that the epidermal growth factor (EGF) receptor becomes constitutively phosphorylated on tyrosine in cells transformed by the src oncogene and in addition displays elevated levels of phosphoserine and phosphothreonine. High-performance liquid chromatography phosphopeptide mapping revealed two predominant sites of tyrosine phosphorylation, both of which differed from the major sites of receptor autophosphorylation; thus, the src-induced phosphorylation is unlikely to occur via an autocrine mechanism. To determine whether pp60v-src altered the signaling activity of the EGF receptor, we analyzed the tyrosine phosphorylation of phospholipase C-gamma, since phosphorylation of this enzyme occurs in response to activation of the EGF receptor but not in response to pp60v-src alone. We found that in cells coexpressing pp60v-src and the EGF receptor, phospholipase C-gamma was constitutively phosphorylated, a result we interpret as indicating that the signaling activity of the EGF receptor was altered in the src-transformed cells. These findings suggest that pp60v-src-induced alterations in phosphorylation and function of growth regulatory receptors could play an important role in generating the phenotypic changes associated with malignant transformation.
Collapse
|
167
|
Abstract
Many hormones, growth factors, and neurotransmitters stimulate their target cells by promoting the hydrolysis of plasma-membrane phosphoinositides to form the two second messengers, diacylglycerol and inositol 1,4,5-trisphosphate [Ins(1,4,5)P3]. In such cells, ligand-receptor interaction stimulates specific phospholipases that are activated by guanyl nucleotide regulatory G proteins or tyrosine phosphorylation. In many cells, the initial rise in cytoplasmic calcium due to Ins(1,4,5)P3-induced mobilization of calcium from agonist-sensitive stores is followed by a sustained phase of cytoplasmic calcium elevation that maintains the target-cell response, and is dependent on influx of extracellular calcium. Numerous inositol phosphates are formed during metabolism of the calcium-mobilizing messenger, inositol 1,4,5-trisphosphate [Ins(1,4,5)P3], to lower and higher phosphorylated derivatives. The cloning of several phospholipase-C isozymes, as well as the Ins(1,4,5)P3-5 kinase and the Ins(1,4,5)P3 receptor, have clarified several aspects of the diversity and complexity of the phosphoinositide-calcium signaling system. In addition to their well-established roles in hormonal activation of cellular responses such as secretion and contraction, phospholipids and their hydrolysis products have been increasingly implicated in the actions of growth factors and oncogenes on cellular growth and proliferation.
Collapse
Affiliation(s)
- K J Catt
- Endocrinology and Reproduction Research Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland
| | | | | |
Collapse
|
168
|
Varticovski L, Daley GQ, Jackson P, Baltimore D, Cantley LC. Activation of phosphatidylinositol 3-kinase in cells expressing abl oncogene variants. Mol Cell Biol 1991; 11:1107-13. [PMID: 1846663 PMCID: PMC359788 DOI: 10.1128/mcb.11.2.1107-1113.1991] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
A phosphoinositide kinase specific for the D-3 position of the inositol ring, phosphatidylinositol (PI) 3-kinase, associates with activated receptors for platelet-derived growth factor, insulin, and colony-stimulating factor 1, with products of the oncogenes src, fms, yes, crk, and with polyomavirus middle T antigen. Efficient fibroblast transformation by proteins of the abl and src oncogene families requires activation of their protein-tyrosine kinase activity and membrane association via an amino-terminal myristoylation. We have demonstrated that the PI 3-kinase directly associates with autophosphorylated, activated protein-tyrosine kinase variants of the abl protein. In vivo, this association leads to accumulation of the highly phosphorylated products of PI 3-kinase, PI-3,4-bisphosphate and PI-3,4,5-trisphosphate, only in myristoylated, transforming abl protein variants. Myristoylation thus appears to be required to recruit PI 3-kinase activity to the plasma membrane for in vivo activation and correlates with the mitogenicity of the abl protein variants.
Collapse
Affiliation(s)
- L Varticovski
- Department of Biomedical Research, St. Elizabeth's Hospital, Boston, Massachusetts 02135
| | | | | | | | | |
Collapse
|
169
|
Anders F. Contributions of the Gordon-Kosswig melanoma system to the present concept of neoplasia. PIGMENT CELL RESEARCH 1991; 4:7-29. [PMID: 1924175 DOI: 10.1111/j.1600-0749.1991.tb00309.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Modern cancerology is based on the oncogene concept. This is rather new. The idea of the oncogene, however, is old, and can be traced back to two sources, namely to "cancer families," reported in 1866 by P. Broka, and to "virus induced" neoplasia, detected by P. Rous in 1911. A gene which is--to my knowledge--the first reported oncogene by definition was detected in the little ornamental Mexican fish Xiphophorus by Myron Gordon, Curt Kosswig, and Georg Häussler in 1928 when they observed the terrible hereditary melanomas that we are now coming to understand and to compare with other kinds of neoplasms in Xiphophorus and in mammals, including humans. Although the Xiphophorus model was always modest in its claims, it has--sometimes too early in its history--contributed many facts to the present concept of neoplasia.
Collapse
Affiliation(s)
- F Anders
- Genetisches Institut, Justus-Liebig-Universität Giessen, Germany
| |
Collapse
|
170
|
Perrella FW, Jankewicz R, Dandrow EA. Phospholipase C from human melanoma: purification and characterization of a phosphatidylinositol-selective enzyme. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1076:209-14. [PMID: 1847829 DOI: 10.1016/0167-4838(91)90268-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Phospholipase C was purified from human melanoma grown as solid tumors in nude mice. The specific activity of the pure enzyme was approx. 100 mumol/min per mg; its apparent molecular mass was determined by sodium dodecyl sulfate polyacrylamide gel electrophoresis to be 150 kDa. The enzyme required calcium for activity and was activated by deoxycholate in the presence of the substrate phosphatidylinositol. The melanoma phospholipase C has a distinctly different substrate preference than those identified from normal tissues; it prefers phosphatidylinositol to phosphatidylinositol bisphosphate. The tumor enzyme was approx. 4-5-fold more active using phosphatidylinositol than phosphatidylinositol bisphosphate as the substrate.
Collapse
Affiliation(s)
- F W Perrella
- Medical Products Department, E.I. DuPont de Nemours and Company, Glenolden, PA 19036
| | | | | |
Collapse
|
171
|
Cantley LC, Auger KR, Carpenter C, Duckworth B, Graziani A, Kapeller R, Soltoff S. Oncogenes and signal transduction. Cell 1991; 64:281-302. [PMID: 1846320 DOI: 10.1016/0092-8674(91)90639-g] [Citation(s) in RCA: 2149] [Impact Index Per Article: 65.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- L C Cantley
- Department of Physiology, Tufts University School of Medicine, Boston, Massachusetts 02111
| | | | | | | | | | | | | |
Collapse
|
172
|
Payrastre B, Plantavid M, Chap H. Stimulation by epidermal growth factor of inositol phosphate production in plasma membranes from A431 cells. BIOCHIMICA ET BIOPHYSICA ACTA 1991; 1056:19-26. [PMID: 1984783 DOI: 10.1016/s0005-2728(05)80068-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Plasma membranes were isolated from A431 cells previously labelled with myo-[3H]inositol during exponential growth, using a rapid procedure on Percoll gradients. They displayed a significant phospholipase (PLC) activity against phosphoinositides, which was stimulated by guanosine 5'-O-(3-thiotriphosphate) (GTP gamma S), epidermal growth factor (EGF) and fetal calf serum (FCS) (24%, 11% and 97% over controls, respectively). The effect of EGF was not significantly increased by GTP gamma S. Upon addition of cytosol, EGF promoted an almost 100% stimulation of inositol 1,4,5-trisphosphate and inositol bisphosphate generation, which displayed an absolute requirement for GTP gamma S. This dose-dependent effect of cytosol was linear until 60 micrograms/ml of cytosolic protein and decreased afterwards; it was abolished by heat treatment and trypsin hydrolysis, and it was not reproduced by an identical amount of bovine serum albumin. The same biphasic stimulation was observed with phosphotyrosyl proteins immunopurified from cytosol of A431 cells previously stimulated by EGF. Since phosphotyrosyl proteins displayed PLC activity, our data suggest that soluble protein substrates of EGF receptor tyrosine kinase, including PLC, could be involved in the regulation of phosphoinositide hydrolysis in response to EGF. Using phosphatidyl[3H]inositol 4,5-bisphosphate (PIP2) dispersed with unlabelled phosphatidylethanolamine and phosphatidylserine as an exogenous substrate, no stimulation of PLC activity by EGF could be detected, either with membranes or with membranes plus cytosol. It is concluded that EGF might stimulate hydrolysis of phosphoinositides by PLC through complex interactions between plasma membrane and cytosolic factors which still remain to be identified.
Collapse
Affiliation(s)
- B Payrastre
- INSERM Unité 326, Hôpital Purpan, Toulouse, France
| | | | | |
Collapse
|
173
|
|
174
|
Abstract
The techniques of detecting phosphotyrosine-containing proteins by AIA and purifying these proteins by affinity chromatography with anti-phosphotyrosine monoclonal antibodies are both reliable and consistent. Although not every tyrosine-phosphorylated protein can be detected and purified by using these techniques, a majority can. No doubt future studies will employ these approaches both for analyzing the specific role that tyrosine protein phosphorylation plays in regulating cell division and for investigating the properties of heretofore uncharacterized proteins that contain phosphotyrosine.
Collapse
|
175
|
Salomon DS, Ciardiello F, Valverius EM, Kim N. The role of ras gene expression and transforming growth factor alpha production in the etiology and progression of rodent and human breast cancer. Cancer Treat Res 1991; 53:107-57. [PMID: 1672074 DOI: 10.1007/978-1-4615-3940-7_6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
176
|
Abstract
Numerous hormones, neurotransmitters and growth factors regulate intracellular events by acting at cell surface receptors which are coupled to the generation of inositol phospholipid-derived intracellular messengers. Receptors trigger the hydrolysis of inositol phospholipids by activating phosphoinositidase C (PIC) enzymes. At least four families of genes encode structurally distinct PIC enzymes and it is likely that distinct PIC isoenzymes participate in different pathways of signal transduction. Two different modes of receptor regulation have been identified and these involve distinct PIC isoenzymes. In the first of these, PIC-gamma is a substrate for growth factor receptor protein-tyrosine kinases. The second of these pathways involves PIC-beta plus other isoenzymes whose activities are regulated by G proteins in response to agonist binding to G protein-linked receptors. At least two types of G proteins regulate PIC activity and each may control the activity of different PIC isoenzymes.
Collapse
Affiliation(s)
- T F Martin
- Zoology Department, University of Wisconsin, Madison 53706
| |
Collapse
|
177
|
|
178
|
Wasilenko WJ, Payne DM, Fitzgerald DL, Weber MJ. Phosphorylation and activation of epidermal growth factor receptors in cells transformed by the src oncogene. Mol Cell Biol 1991; 11:309-21. [PMID: 1702513 PMCID: PMC359621 DOI: 10.1128/mcb.11.1.309-321.1991] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Because functionally significant substrates for the tyrosyl protein kinase activity of pp60v-src are likely to include membrane-associated proteins involved in normal growth control, we have tested the hypothesis that pp60v-src could phosphorylate and alter the signaling activity of transmembrane growth factor receptors. We have found that the epidermal growth factor (EGF) receptor becomes constitutively phosphorylated on tyrosine in cells transformed by the src oncogene and in addition displays elevated levels of phosphoserine and phosphothreonine. High-performance liquid chromatography phosphopeptide mapping revealed two predominant sites of tyrosine phosphorylation, both of which differed from the major sites of receptor autophosphorylation; thus, the src-induced phosphorylation is unlikely to occur via an autocrine mechanism. To determine whether pp60v-src altered the signaling activity of the EGF receptor, we analyzed the tyrosine phosphorylation of phospholipase C-gamma, since phosphorylation of this enzyme occurs in response to activation of the EGF receptor but not in response to pp60v-src alone. We found that in cells coexpressing pp60v-src and the EGF receptor, phospholipase C-gamma was constitutively phosphorylated, a result we interpret as indicating that the signaling activity of the EGF receptor was altered in the src-transformed cells. These findings suggest that pp60v-src-induced alterations in phosphorylation and function of growth regulatory receptors could play an important role in generating the phenotypic changes associated with malignant transformation.
Collapse
Affiliation(s)
- W J Wasilenko
- Department of Microbiology, University of Virginia School of Medicine, Charlottesville 22908
| | | | | | | |
Collapse
|
179
|
Buick RN, Filmus J, Church JG. The role of epidermal growth factor receptors in breast cancer. Cancer Treat Res 1991; 53:159-70. [PMID: 1672075 DOI: 10.1007/978-1-4615-3940-7_7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
180
|
Marvel J, Rimon G, Tatham P, Cockcroft S. Evidence that the CD45 phosphatase regulates the activity of the phospholipase C in mouse T lymphocytes. Eur J Immunol 1991; 21:195-201. [PMID: 1846815 DOI: 10.1002/eji.1830210129] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The importance of the tyrosine phosphatase CD45 in the regulation of lymphocyte activation was first demonstrated using antibodies against the extracellular domain of CD45 in functional assays. More recently it was reported that CD45-negative mutants were nonresponsive to stimulation through the T cell receptor-CD3 complex. We have studied the effect of CD45 cross-linking on the early signals induced by CD3 in mouse T cells. We show that CD45 cross-linking inhibits the increase in inositol phosphates and cytoplasmic Ca2+ induced by cross-linking of CD3. This indicates that CD45 is involved in the regulation of phospholipase C.
Collapse
Affiliation(s)
- J Marvel
- Department of Biology, University College School of Medicine, London
| | | | | | | |
Collapse
|
181
|
Yonezawa K, Pierce S, Stover C, Aggerbeck M, Rutter WJ, Roth RA. Endogenous substrates of the insulin receptor: studies with cells expressing wild-type and mutant receptors. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1991; 293:227-38. [PMID: 1767733 DOI: 10.1007/978-1-4684-5949-4_21] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- K Yonezawa
- Department of Pharmacology, Stanford University School of Medicine, CA 94305
| | | | | | | | | | | |
Collapse
|
182
|
Stimulation of the T-cell receptors CD3 and CD2 with OKT3 and OKT11 antibodies activates a common pertussis toxin-insensitive G-protein. Eur J Pharmacol 1990; 189:363-72. [PMID: 1981560 DOI: 10.1016/0922-4106(90)90033-t] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The association of G-proteins with the T-cell-specific receptor structures CD3 and CD2 was investigated. High-affinity GTPase activity in membrane preparations of the human leukemic T-cell line Jurkat could be induced by the monoclonal antibodies OKT3 (anti-CD3) and OKT11 (anti-CD2). When combining maximally active concentrations of OKT3 and OKT11, no additive effect was seen on GTPase activity. In mutant Jurkat cells lacking the CD3 complex but with an intact CD2 receptor, neither OKT3 nor OKT11 could stimulate GTPase activity. Activation of CD3 and CD2 by monoclonal antibodies also stimulated phospholipase C activity as measured by breakdown of membrane phosphoinositides in wild-type but not in mutant Jurkat cells. Neither GTPase nor phospholipase C activation was sensitive to pretreatment with doses of pertussis toxin (PTX) that caused ADP ribosylation of a sensitive G-protein. Our data show that the CD3 complex and the CD2 receptor may activate a common PTX-insensitive G-protein. The CD2 receptor appears to stimulate the G-protein by interacting with the CD3 complex. The data are compatible with, but do not prove, that this G-protein is involved in the activation of phospholipase C by the two receptors.
Collapse
|
183
|
Interactions of phosphatidylinositol kinase, GTPase-activating protein (GAP), and GAP-associated proteins with the colony-stimulating factor 1 receptor. Mol Cell Biol 1990. [PMID: 2172781 DOI: 10.1128/mcb.10.11.5601] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The interactions of the macrophage colony-stimulating factor 1 (CSF-1) receptor with potential targets were investigated after ligand stimulation either of mouse macrophages or of fibroblasts that ectopically express mouse CSF-1 receptors. In Rat-2 cells expressing the mouse CSF-1 receptor, full activation of the receptor and cellular transformation require exogenous CSF-1, whereas NIH 3T3 cells expressing mouse c-fms are transformed by autocrine stimulation. Activated CSF-1 receptors physically associate with a phosphatidylinositol (PI) 3'-kinase. A mutant CSF-1 receptor with a deletion of the kinase insert region was deficient in its ability to bind functional PI 3'-kinase and to induce PI 3'-kinase activity precipitable with antiphosphotyrosine antibodies. In fibroblasts, CSF-1 stimulation also induced the phosphorylation of the GTPase-activating protein (GAP)-associated protein p62 on tyrosine, although GAP itself was a relatively poor substrate. In contrast to PI 3'-kinase association, phosphorylation of p62 and GAP was not markedly affected by deletion of the kinase insert region. These results indicate that the kinase insert region selectively enhances the CSF-1-dependent association of the CSF-1 receptor with active PI 3'-kinase. The insert deletion mutant retains considerable transforming activity in NIH 3T3 cells (G. Taylor, M. Reedijk, V. Rothwell, L. Rohrschneider, and T. Pawson, EMBO J. 8:2029-2037, 1989). This mutant was more seriously impaired in Rat-2 cell transformation, although mutant-expressing Rat-2 cells still formed small colonies in soft agar in the presence of CSF-1. Therefore, phosphorylation of GAP and p62 through activation of the CSF-1 receptor does not result in full fibroblast transformation. The interaction between the CSF-1 receptor and PI 3'-kinase may contribute to c-fms fibroblast transformation and play a role in CSF-1-stimulated macrophages.
Collapse
|
184
|
Overexpression of phospholipase C-gamma in NIH 3T3 fibroblasts results in increased phosphatidylinositol hydrolysis in response to platelet-derived growth factor and basic fibroblast growth factor. Mol Cell Biol 1990. [PMID: 2172791 DOI: 10.1128/mcb.10.11.6069] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Overexpression of phospholipase C-gamma in fibroblasts led to increased tyrosine phosphorylation of this enzyme in response to platelet-derived growth factor and basic fibroblast growth factor. This correlated with increased phosphoinositide release but not with enhanced mitogenicity. Thus, phospholipase C-gamma-mediated phosphoinositide metabolism may not be limiting in the signaling pathways initiated by these growth factors.
Collapse
|
185
|
Nair BG, Parikh B, Milligan G, Patel TB. Gs alpha mediates epidermal growth factor-elicited stimulation of rat cardiac adenylate cyclase. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(17)45362-2] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
186
|
Olashaw NE, Rhee SG, Pledger WJ. Cyclic AMP agonists induce the phosphorylation of phospholipase C-tau and of a 76 kDa protein co-precipitated by anti-(phospholipase C-tau) monoclonal antibodies in BALB/c-3T3 cells. Relationship to inositol phosphate formation. Biochem J 1990; 272:297-303. [PMID: 1702622 PMCID: PMC1149698 DOI: 10.1042/bj2720297] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Previous studies have demonstrated enhanced phosphorylation of phospholipase C-tau (PLC-tau), a key regulatory enzyme in phosphoinositide metabolism, in cells treated with platelet-derived growth factor (PDGF) and epidermal growth factor, both of which act via specific receptor tyrosine kinases. Our studies on BALB/c-3T3 cells show that agents that promote cellular cyclic AMP accumulation also increase the phosphorylation, specifically the serine phosphorylation, of this enzyme. Increased phosphorylation of PLC-t (2-3-fold) was evident within 5-10 min of addition of isobutylmethylxanthine (IBMX) and either cholera toxin or forskolin to cells, and persisted for at least 3 h. Treatment of cells with cyclic AMP agonists also enhanced, with similar kinetics, the phosphorylation of a 76 kDa protein co-precipitated by anti-PLC-tau monoclonal antibodies. Brief exposure of cells to cholera toxin/IBMX or forskolin/IBMX decreased inositol phosphate formation induced by the GTP-binding protein (G-protein) activator aluminium fluoride by approx. 50%, but was without effect on PDGF-stimulated inositol phosphate formation. These findings suggest that PLC-tau, and perhaps the 76 kDa co-precipitated protein, are substrates of cyclic AMP-dependent protein kinase in BALB/c-3T3 cells: however, the lack of effect of cyclic AMP elevation on PDGF-stimulated inositol phosphate formation indicates that the intrinsic activity of PLC-tau is unaltered by cyclic AMP-mediated phosphorylation.
Collapse
Affiliation(s)
- N E Olashaw
- Department of Cell Biology, Vanderbilt University School of Medicine, Nashville, TN 37232
| | | | | |
Collapse
|
187
|
Tissue-specific transformation by epidermal growth factor receptor: a single point mutation within the ATP-binding pocket of the erbB product increases its intrinsic kinase activity and activates its sarcomagenic potential. Proc Natl Acad Sci U S A 1990; 87:9103-7. [PMID: 1979168 PMCID: PMC55112 DOI: 10.1073/pnas.87.23.9103] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Avian c-erbB is activated to a leukemia oncogene following truncation of its amino-terminal, ligand-binding domain by retroviral insertion. The insertionally activated transcripts encode protein products that have constitutive tyrosine kinase activity and that can induce erythro-leukemia but not sarcomas. We have found that a single point mutation within the ATP-binding pocket of the tyrosine kinase domain in this truncated molecule can increase the ability of this oncogene to induce anchorage-independent growth of fibroblasts in vitro and fibrosarcoma formation in vivo. Associated with this increased transforming potential is a corresponding increase in the kinase activity of the mutant erbB protein product. The mutation, which converts a valine to isoleucine at position 157 of the insertionally activated c-erbB product, is at a residue that is highly conserved within the protein kinase family. To our knowledge, this is the first demonstration of a point mutation in the ATP-binding pocket that activates a tyrosine kinase.
Collapse
|
188
|
Nishibe S, Wahl MI, Hernández-Sotomayor SM, Tonks NK, Rhee SG, Carpenter G. Increase of the catalytic activity of phospholipase C-gamma 1 by tyrosine phosphorylation. Science 1990; 250:1253-6. [PMID: 1700866 DOI: 10.1126/science.1700866] [Citation(s) in RCA: 571] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Phospholipase C-gamma 1 (PLC-gamma 1), an isozyme of the phosphoinositide-specific phospholipase C family, which occupies a central role in hormonal signal transduction pathways, is an excellent substrate for the epidermal growth factor (EGF) receptor tyrosine kinase. Epidermal growth factor elicits tyrosine phosphorylation of PLC-gamma 1 and phosphatidylinositol 4,5-bisphosphate hydrolysis in various cell lines. The ability of tyrosine phosphorylation to activate the catalytic activity of PLC-gamma 1 was tested. Tyrosine phosphorylation in intact cells or in vitro increased the catalytic activity of PLC-gamma 1. Also, treatment of EGF-activated PLC-gamma 1 with a tyrosine-specific phosphatase substantially decreased the catalytic activity of PLC-gamma 1. These results suggest that the EGF-stimulated formation of inositol 1,4,5-trisphosphate and diacylglycerol in intact cells results, at least in part, from catalytic activation of PLC-gamma 1 through tyrosine phosphorylation.
Collapse
Affiliation(s)
- S Nishibe
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, TN 37232-0146
| | | | | | | | | | | |
Collapse
|
189
|
Imoto M, Shimura N, Ui H, Umezawa K. Inhibition of EGF-induced phospholipase C activation in A431 cells by erbstatin, a tyrosine kinase inhibitor. Biochem Biophys Res Commun 1990; 173:208-11. [PMID: 2256916 DOI: 10.1016/s0006-291x(05)81042-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Erbstatin, a tyrosine kinase inhibitor, inhibited epidermal growth factor (EGF)-induced inositol phosphate production in cultured A431 cells. However, it did not inhibit ATP-induced inositol phosphate production. Cytosolic but not membrane-associated phospholipase C was activated by EGF, and erbstatin inhibited enhancement of the phospholipase C activity in EGF-treated cells. Thus, tyrosine kinase of A431 cells is suggested to be functionally involved in phospholipase C activation.
Collapse
Affiliation(s)
- M Imoto
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Yokohama, Japan
| | | | | | | |
Collapse
|
190
|
Reedijk M, Liu XQ, Pawson T. Interactions of phosphatidylinositol kinase, GTPase-activating protein (GAP), and GAP-associated proteins with the colony-stimulating factor 1 receptor. Mol Cell Biol 1990; 10:5601-8. [PMID: 2172781 PMCID: PMC361316 DOI: 10.1128/mcb.10.11.5601-5608.1990] [Citation(s) in RCA: 66] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The interactions of the macrophage colony-stimulating factor 1 (CSF-1) receptor with potential targets were investigated after ligand stimulation either of mouse macrophages or of fibroblasts that ectopically express mouse CSF-1 receptors. In Rat-2 cells expressing the mouse CSF-1 receptor, full activation of the receptor and cellular transformation require exogenous CSF-1, whereas NIH 3T3 cells expressing mouse c-fms are transformed by autocrine stimulation. Activated CSF-1 receptors physically associate with a phosphatidylinositol (PI) 3'-kinase. A mutant CSF-1 receptor with a deletion of the kinase insert region was deficient in its ability to bind functional PI 3'-kinase and to induce PI 3'-kinase activity precipitable with antiphosphotyrosine antibodies. In fibroblasts, CSF-1 stimulation also induced the phosphorylation of the GTPase-activating protein (GAP)-associated protein p62 on tyrosine, although GAP itself was a relatively poor substrate. In contrast to PI 3'-kinase association, phosphorylation of p62 and GAP was not markedly affected by deletion of the kinase insert region. These results indicate that the kinase insert region selectively enhances the CSF-1-dependent association of the CSF-1 receptor with active PI 3'-kinase. The insert deletion mutant retains considerable transforming activity in NIH 3T3 cells (G. Taylor, M. Reedijk, V. Rothwell, L. Rohrschneider, and T. Pawson, EMBO J. 8:2029-2037, 1989). This mutant was more seriously impaired in Rat-2 cell transformation, although mutant-expressing Rat-2 cells still formed small colonies in soft agar in the presence of CSF-1. Therefore, phosphorylation of GAP and p62 through activation of the CSF-1 receptor does not result in full fibroblast transformation. The interaction between the CSF-1 receptor and PI 3'-kinase may contribute to c-fms fibroblast transformation and play a role in CSF-1-stimulated macrophages.
Collapse
Affiliation(s)
- M Reedijk
- Division of Molecular and Developmental Biology, Samuel Lunenfeld Research Institute, Mt. Sinai Hospital, Toronto, Ontario, Canada
| | | | | |
Collapse
|
191
|
Preferential inhibition of the platelet-derived growth factor receptor tyrosine kinase by staurosporine. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(17)30517-3] [Citation(s) in RCA: 63] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
|
192
|
Lund KA, Lazar CS, Chen WS, Walsh BJ, Welsh JB, Herbst JJ, Walton GM, Rosenfeld MG, Gill GN, Wiley HS. Phosphorylation of the epidermal growth factor receptor at threonine 654 inhibits ligand-induced internalization and down-regulation. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(17)30533-1] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
193
|
Cuadrado A, Molloy CJ. Overexpression of phospholipase C-gamma in NIH 3T3 fibroblasts results in increased phosphatidylinositol hydrolysis in response to platelet-derived growth factor and basic fibroblast growth factor. Mol Cell Biol 1990; 10:6069-72. [PMID: 2172791 PMCID: PMC361408 DOI: 10.1128/mcb.10.11.6069-6072.1990] [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: 12/30/2022] Open
Abstract
Overexpression of phospholipase C-gamma in fibroblasts led to increased tyrosine phosphorylation of this enzyme in response to platelet-derived growth factor and basic fibroblast growth factor. This correlated with increased phosphoinositide release but not with enhanced mitogenicity. Thus, phospholipase C-gamma-mediated phosphoinositide metabolism may not be limiting in the signaling pathways initiated by these growth factors.
Collapse
Affiliation(s)
- A Cuadrado
- Laboratory of Cellular and Molecular Biology, National Cancer Institute, Bethesda, Maryland 20892
| | | |
Collapse
|
194
|
Serunian LA, Auger KR, Roberts TM, Cantley LC. Production of novel polyphosphoinositides in vivo is linked to cell transformation by polyomavirus middle T antigen. J Virol 1990; 64:4718-25. [PMID: 2168961 PMCID: PMC247958 DOI: 10.1128/jvi.64.10.4718-4725.1990] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Phosphatidylinositol 3-kinase associates with the polyomavirus middle T antigen (PyMTAg)-pp60c-src complex in polyomavirus-transformed cells. Here we show that anti-PyMTAg immunoprecipitates from PyMTAg-transformed NIH 3T3 cells have lipid kinase activities that phosphorylate phosphatidylinositol, phosphatidylinositol-4-bisphosphate, and phosphatidylinositol-4,5-bisphosphate at the D-3 position of the inositol ring to produce three new polyphosphoinositides: phosphatidylinositol-3-phosphate (PI-3-P), phosphatidylinositol-3,4-bisphosphate (PI-3,4-P2), and phosphatidylinositol trisphosphate (PIP3), respectively. PI-3-P was detected in intact parental and PyMTAg-transformed NIH 3T3 fibroblasts at both low and high cell densities. However, parental NIH 3T3 fibroblasts produced no detectable PI-3,4-P2 or PIP3 at high density. In contrast, growing, subconfluent cells and wild-type PyMTAg-transformed cells at high density had greatly enhanced incorporation of [3H]-inositol into these highly phosphorylated lipids. Cells transfected with a transformation-defective mutant of PyMTAg had undetectable levels of PI-3,4-P2 and PIP3 at high density. Thus, the synthesis of novel polyphosphoinositides by lipid kinase activity associated with PyMTAg correlates with cell growth and transformation.
Collapse
Affiliation(s)
- L A Serunian
- Department of Physiology, Tufts University School of Medicine, Boston, Massachusetts 02111
| | | | | | | |
Collapse
|
195
|
Agonist stimulation of Na+/K+/Cl- cotransport in rat glomerular mesangial cells. Evidence for protein kinase C-dependent and Ca2+/calmodulin-dependent pathways. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(18)38208-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
|
196
|
Wheeler LA, Goodrum DD, Sachs G. Role of protein kinase C in the regulation of cytosolic Ca2+ in A431 cells: separation of growth factor and bradykinin pathways. J Membr Biol 1990; 118:77-91. [PMID: 2283681 DOI: 10.1007/bf01872206] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Calcium signaling systems in nonexcitable cells involve activation of Ca2+ entry across the plasma membrane and release from intracellular stores as well as activation of Ca2+ pumps and inhibition of passive Ca2+ pathways to ensure exact regulation of free cytosolic Ca2+ concentration [( Ca2+]i). A431 cells loaded with fura-2 cells were used as a model system to examine regulation of Ca2+ entry and intracellular release. Epidermal growth factor (EGF) and transforming growth factor alpha (TGF-alpha) both stimulated Ca2+ entry and release while bradykinin appeared only to release Ca2+ from intracellular stores. The possible role of protein kinase C (PKC) in modulating the [Ca2+]i response to these agonists was examined by four methods. Low concentrations of TPA (2 x 10(-10) M) had no effect on Ca2+ release due to EGF, TGR-alpha or bradykinin but resulted in a rapid return of [Ca2+]i to baseline levels for EGF or TGF-alpha. Addition of the PKC inhibitor staurosporine (1 and 10 nM) completely inhibited the action of TPA on EGF-induced [Ca2+]i changes. An inhibitor of diglyceride kinase (R59022) mimicked the action of TPA. Down-regulation of PKC by overnight incubation with 0.1 or 1 microM TPA produced the converse effect, namely prolonged Ca2+ entry following stimulation with EGF or TGF-alpha. To show that one effect of TPA was on Ca2+ entry, fura-2 loaded cells were suspended in Mn2+ rather than Ca2+ buffers. Addition of EGF or TGF-alpha resulted in Ca2+ release and Mn2+ entry. TPA but not the inactive phorbol ester, 4-alpha-phorbol-12,13-didecanoate, inhibited the Mn2+ influx. Thus, PKC is able to regulate Ca2+ entry due to EGF or TGF-alpha in this cell type. A431 cells treated with higher concentrations of TPA (5 x 10(-8) M) inhibited not only Ca2+ entry but also Ca2+ release due to EGF/TGF-alpha but had no effect on bradykinin-mediated Ca2+ release, suggesting differences in the regulation of the intracellular stores responsive to these two classes of agonists. Furthermore, sequential addition of EGF or TGF-alpha gave a single transient of [Ca2+]i, showing a common pool of Ca2+ for these agonists. In contrast, sequential addition of EGF (or TGF-alpha) and bradykinin resulted in two [Ca2+]i transients equal in size to those obtained with a single agonist.(ABSTRACT TRUNCATED AT 400 WORDS)
Collapse
Affiliation(s)
- L A Wheeler
- Department of Biological Sciences, Discovery Research Allegan, Inc./Herbert Labs, Irvine, California 92715
| | | | | |
Collapse
|
197
|
T cell antigen receptor engagement stimulates c-raf phosphorylation and induces c-raf-associated kinase activity via a protein kinase C-dependent pathway. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(17)44776-4] [Citation(s) in RCA: 89] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
|
198
|
Characterization and cDNA cloning of phospholipase C-gamma, a major substrate for heparin-binding growth factor 1 (acidic fibroblast growth factor)-activated tyrosine kinase. Mol Cell Biol 1990. [PMID: 2167438 DOI: 10.1128/mcb.10.9.4770] [Citation(s) in RCA: 138] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Heparin-binding growth factors (HBGFs) bind to high-affinity cell surface receptors which possess intrinsic tyrosine kinase activity. A Mr 150,000 protein phosphorylated on tyrosine in response to class 1 HBGF (HBGF-1) was purified and partially sequenced. On the basis of this sequence, cDNA clones were isolated from a human endothelial cell library and identified as encoding phospholipase C-gamma. Phosphorylation of phospholipase C-gamma in intact cells treated with HBGF-1 was directly demonstrated by using antiphospholipase C-gamma antibodies. Thus, HBGF-1 joins epidermal growth factor and platelet-derived growth factor, whose receptor activation leads to tyrosine phosphorylation and probable activation of phospholipase C-gamma.
Collapse
|
199
|
Hepler JR, Jeffs RA, Huckle WR, Outlaw HE, Rhee SG, Earp HS, Harden TK. Evidence that the epidermal growth factor receptor and non-tyrosine kinase hormone receptors stimulate phosphoinositide hydrolysis by independent pathways. Biochem J 1990; 270:337-44. [PMID: 1698055 PMCID: PMC1131726 DOI: 10.1042/bj2700337] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We have shown previously that exposure of a non-transformed continuous line of rat liver epithelial (WB) cells to epidermal growth factor (EGF), adrenaline, angiotensin II or [Arg8]vasopressin results in an accumulation of the inositol phosphates InsP1, InsP2 and InsP3 [Hepler, Earp & Harden (1988) J. Biol. Chem. 263, 7610-7619]. Studies were carried out with WB cells to determine whether the EGF receptor and other, non-tyrosine kinase, hormone receptors stimulate phosphoinositide hydrolysis by common, overlapping or separate pathways. The time courses for accumulation of inositol phosphates in response to angiotensin II and EGF were markedly different. Whereas angiotensin II stimulated a very rapid accumulation of inositol phosphates (maximal by 30 s), increases in the levels of inositol phosphates in response to EGF were measurable only following a 30 s lag period; maximal levels were attained by 7-8 min. Chelation of extracellular Ca2+ with EGTA did not modify this relative difference between angiotensin II and EGF in the time required to attain maximal phospholipase C activation. Under experimental conditions in which agonist-induced desensitization no longer occurred in these cells, the inositol phosphate responses to EGF and angiotensin II were additive, whereas those to angiotensin II and [Arg8]vasopressin were not additive. In crude WB lysates, angiotensin II, [Arg8]vasopressin and adrenaline each stimulated inositol phosphate formation in a guanine-nucleotide-dependent manner. In contrast, EGF failed to stimulate inositol phosphate formation in WB lysates in the presence or absence of guanosine 5'-[gamma-thio]triphosphate (GTP[S]), even though EGF retained the capacity to bind to and stimulate tyrosine phosphorylation of its own receptor. Pertussis toxin, at concentrations that fully ADP-ribosylate and functionally inactivate the inhibitory guanine-nucleotide regulatory protein of adenylate cyclase (Gi), had no effect on the capacity of EGF or hormones to stimulate inositol phosphate accumulation. In intact WB cells, the capacity of EGF, but not angiotensin II, to stimulate inositol phosphate accumulation was correlated with its capacity to stimulate tyrosine phosphorylation of the 148 kDa isoenzyme of phospholipase C. Taken together, these findings suggest that, whereas angiotensin II, [Arg8]vasopressin and alpha 1-adrenergic receptors are linked to activation of one or more phospholipase(s) C by an unidentified G-protein(s), the EGF receptor stimulates phosphoinositide hydrolysis by a different pathway, perhaps as a result of its capacity to stimulate tyrosine phosphorylation of phospholipase C-gamma.
Collapse
Affiliation(s)
- J R Hepler
- Department of Pharmacology, School of Medicine, University of North Carolina, Chapel Hill 27599
| | | | | | | | | | | | | |
Collapse
|
200
|
Burgess WH, Dionne CA, Kaplow J, Mudd R, Friesel R, Zilberstein A, Schlessinger J, Jaye M. Characterization and cDNA cloning of phospholipase C-gamma, a major substrate for heparin-binding growth factor 1 (acidic fibroblast growth factor)-activated tyrosine kinase. Mol Cell Biol 1990; 10:4770-7. [PMID: 2167438 PMCID: PMC361079 DOI: 10.1128/mcb.10.9.4770-4777.1990] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Heparin-binding growth factors (HBGFs) bind to high-affinity cell surface receptors which possess intrinsic tyrosine kinase activity. A Mr 150,000 protein phosphorylated on tyrosine in response to class 1 HBGF (HBGF-1) was purified and partially sequenced. On the basis of this sequence, cDNA clones were isolated from a human endothelial cell library and identified as encoding phospholipase C-gamma. Phosphorylation of phospholipase C-gamma in intact cells treated with HBGF-1 was directly demonstrated by using antiphospholipase C-gamma antibodies. Thus, HBGF-1 joins epidermal growth factor and platelet-derived growth factor, whose receptor activation leads to tyrosine phosphorylation and probable activation of phospholipase C-gamma.
Collapse
Affiliation(s)
- W H Burgess
- American Red Cross, Rockville, Maryland 20855
| | | | | | | | | | | | | | | |
Collapse
|