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Rhee SG. A catalytic career: Studies spanning glutamine synthetase, phospholipase C, peroxiredoxin, and the intracellular messenger role of hydrogen peroxide. J Biol Chem 2019; 294:5169-5180. [PMID: 30926755 DOI: 10.1074/jbc.x119.007975] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
I learned biochemistry from P. Boon Chock and Earl Stadtman while working on the regulation of Escherichia coli glutamine synthetase as a postdoctoral fellow at the National Institutes of Health. After becoming a tenured scientist at the same institute, my group discovered, purified, and cloned the first three prototypical members of the phospholipase C family and uncovered the mechanisms by which various cell-surface receptors activate these enzymes to generate diacylglycerol and inositol 1,4,5-trisphosphate. We also discovered the family of peroxiredoxin (Prx) enzymes that catalyze the reduction of H2O2, and we established that mammalian cells express six Prx isoforms that not only protect against oxidative damage but also mediate cell signaling by modulating intracellular H2O2 levels. To validate the signaling role of H2O2, we showed that epidermal growth factor induces a transient increase in intracellular H2O2 levels, and the essential cysteine residue of protein-tyrosine phosphatases is a target for specific and reversible oxidation by the H2O2 produced in such cells. These observations led to a new paradigm in receptor signaling, in which protein tyrosine phosphorylation is achieved not via activation of receptor tyrosine kinases alone but also through concurrent inhibition of protein-tyrosine phosphatases by H2O2 Our studies revealed that Prx isozymes are extensively regulated via phosphorylation as well as by hyperoxidation of the active-site cysteine to cysteine sulfinic acid, with the reverse reaction being catalyzed by sulfiredoxin. This reversible hyperoxidation of Prx was further shown to constitute a universal marker for circadian rhythms in all domains of life.
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Affiliation(s)
- Sue Goo Rhee
- From the Yonsei Biomedical Research Institute, Yonsei University College of Medicine, Seoul 120-752, Korea and the Biochemistry and Biophysics Center, NHLBI, National Institutes of Health, Bethesda, Maryland 20892
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2
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Rhee SG. Reflections on the days of phospholipase C. Adv Biol Regul 2013; 53:223-231. [PMID: 24054839 DOI: 10.1016/j.jbior.2013.08.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 08/20/2013] [Accepted: 08/20/2013] [Indexed: 06/02/2023]
Affiliation(s)
- Sue Goo Rhee
- Yonsei Biomedical Research Institute, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-752, South Korea.
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Shimazaki Y. Hydrolytic activity of lipase on anion-exchange solid phase column after separation and electrotransfer by non-denaturing electrophoresis. JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS 2007; 70:487-91. [PMID: 17239955 DOI: 10.1016/j.jbbm.2006.11.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2006] [Revised: 10/21/2006] [Accepted: 11/29/2006] [Indexed: 05/13/2023]
Abstract
This study reports the initial separation of phospholipase C-alpha from porcine retina using non-denaturing two-dimensional gel electrophoresis (2-DE). Detection was by negative staining and then its hydrolytic activity was estimated using alpha-naphthyl acetate in a 2-DE gel. A spot of phospholipase C-alpha separated by 2-DE was excised. It was then electrophoretically transferred to an anion-exchange solid phase column after 40 mg, equal to dry weight of the solid resin from the cartridge (Accell Plus QMA, Waters Corporation), was packed into a disposable 1 ml syringe to make an anion-exchange solid phase column. Phosphatidylcholine was hydrolyzed in the anion-exchange solid phase column containing phospholipase C-alpha. The results indicated that a column with hydrolytic activity could be produced once lipases separated by non-denaturing 2-DE were transferred to the solid phase column.
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Affiliation(s)
- Youji Shimazaki
- Graduate School of Science and Engineering (Science Section) and Venture Business Laboratory, Ehime University, Matsuyama City, 790-8577, Japan.
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Chapter 3: Interactions of Al and Related Metals with Membrane Phospholipids: Consequences on Membrane Physical Properties. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/s1554-4516(06)04003-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
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McCormack K. A New Perspective on Signal Transduction in Neuropathic Pain The Emerging Role of the G Protein By Dimer in Transducing and Modulating Opioid Signaling. Pain 2003. [DOI: 10.1201/9780203911259.ch5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Verstraeten SV, Oteiza PI. Al(3+)-mediated changes in membrane physical properties participate in the inhibition of polyphosphoinositide hydrolysis. Arch Biochem Biophys 2002; 408:263-71. [PMID: 12464280 DOI: 10.1016/s0003-9861(02)00557-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We investigated the possible involvement of Al(3+)-induced alterations in membrane physical properties in Al(3+)-mediated inhibition of polyphosphoinositide (PPI) hydrolysis by the enzyme phosphatidylinositol-specific phospholipase C (PI-PLC). Liposomes composed of brain phosphatidylcholine (PC) or of PC and a mixture of brain PPI (PC:PPI) were incubated in the presence of Al(3+) (1-100 microM). We evaluated: (1) the amount of membrane-bound Al(3+), (2) the effects of Al(3+) on key membrane physical properties (surface potential, lipid fluidity, and lipid arrangement), and (3) the hydrolysis of PPI. Al(3+) binding to PC:PPI (60:40 mol/mol) liposomes was 1.3 times higher than to PC:PPI (90:10 mol/mol) liposomes and did not change after treatment with Triton X-100. Al(3+) increased membrane surface potential, promoted the loss of membrane fluidity, and caused lateral phase separation in PC:PPI liposomes. Phosphatidylinositol and phosphatidylinositol monophosphate hydrolysis in the presence of PI-PLC was not affected by Al(3+), but a significant and concentration-dependent inhibition of PIP(2) hydrolysis was observed, an effect that was prevented by previous bilayer disruption with Triton X-100. The obtained results support the hypothesis that Al(3+) binding to liposomes promotes the formation of rigid clusters enriched in PPI, restricting the accessibility of the enzyme to the substrate and subsequently inhibiting PIP(2) hydrolysis by PI-PLC.
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Affiliation(s)
- Sandra V Verstraeten
- Department of Biological Chemistry, IQUIFIB (UBA-CONICET), School of Pharmacy and Biochemistry, University of Buenos Aires, Argentina
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Hodson EA, Ashley CC, Lymn JS. Association of heterotrimeric G-proteins with bovine aortic phospholipase C gamma. Biochem Biophys Res Commun 1999; 258:425-30. [PMID: 10329403 DOI: 10.1006/bbrc.1999.0657] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The widely expressed phospholipase C gamma1 (PLCgamma1) isoform has been implicated in the signalling of cell growth through its ability to hydrolyse phosphatidylinositol 4,5-bisphosphate to give inositol 1,4,5-trisphosphate and 1,2-diacylglycerol. Stimulation of PLCgamma1 activity occurs upon phosphorylation of specific tyrosine residues, although it is unclear how this phosphorylation actually stimulates catalytic activity. Indeed recent reports suggest that accessory factors such as GTP-binding proteins may also be required for complete activation of PLCgamma1 in some cells. This may be of importance in vascular smooth muscle where traditionally G-protein linked PLCbeta isoforms are often absent. Here, we show that bovine aortic PLCgamma1 activity is substantially enhanced by both GTPgammaS and sodium fluoride. Similarly, immunoprecipitated PLCgamma1 is associated with an approximately 40kDa GTPgammaS-binding protein and both Galphai and Galphaq were detected in this immunoprecipitate. This data suggests that bovine aortic PLCgamma1 is both associated with, and may be activated by, heterotrimeric G-proteins.
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Affiliation(s)
- E A Hodson
- Physiology Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PT, United Kingdom
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Hodson EA, Ashley CC, Hughes AD, Lymn JS. Regulation of phospholipase C-delta by GTP-binding proteins-rhoA as an inhibitory modulator. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1403:97-101. [PMID: 9622602 DOI: 10.1016/s0167-4889(98)00028-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The regulation of Phospholipase C (PLC)delta activity remains obscure. These studies show that PLCdelta1 activity is significantly enhanced by both guanosine thiotriphosphate (GTPgammaS) and Clostridium botulinum exoenzyme C3 (C3) but not by aluminium fluoride. C3 ADP ribosylated a 21-kDa protein in the PLCdelta1 preparation and Western blotting identified rhoA in these samples. RhoA acts as an inhibitory modulator of PLCdelta activity.
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Affiliation(s)
- E A Hodson
- Physiology Laboratory, University of Oxford, Parks Road, Oxford OX1 3PT, UK
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Munnik T, Irvine RF, Musgrave A. Phospholipid signalling in plants. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1389:222-72. [PMID: 9512651 DOI: 10.1016/s0005-2760(97)00158-6] [Citation(s) in RCA: 257] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- T Munnik
- Institute for Molecular Cell Biology, BioCentrum Amsterdam, University of Amsterdam, The Netherlands.
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Singer WD, Brown HA, Sternweis PC. Regulation of eukaryotic phosphatidylinositol-specific phospholipase C and phospholipase D. Annu Rev Biochem 1997; 66:475-509. [PMID: 9242915 DOI: 10.1146/annurev.biochem.66.1.475] [Citation(s) in RCA: 335] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
This review focuses on two phospholipase activities involved in eukaryotic signal transduction. The action of the phosphatidylinositol-specific phospholipase C enzymes produces two well-characterized second messengers, inositol 1,4,5-trisphosphate and diacylglycerol. This discussion emphasizes recent advances in elucidation of the mechanisms of regulation and catalysis of the various isoforms of these enzymes. These are especially related to structural information now available for a phospholipase C delta isozyme. Phospholipase D hydrolyzes phospholipids to produce phosphatidic acid and the respective head group. A perspective of selected past studies is related to emerging molecular characterization of purified and cloned phospholipases D. Evidence for various stimulatory agents (two small G protein families, protein kinase C, and phosphoinositides) suggests complex regulatory mechanisms, and some studies suggest a role for this enzyme activity in intracellular membrane traffic.
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Affiliation(s)
- W D Singer
- Department of Pharmacology, University of Texas-Southwestern Medical Center, DaHas 75235-9041, USA
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Hwang SC, Jhon DY, Bae YS, Kim JH, Rhee SG. Activation of phospholipase C-gamma by the concerted action of tau proteins and arachidonic acid. J Biol Chem 1996; 271:18342-9. [PMID: 8702475 DOI: 10.1074/jbc.271.31.18342] [Citation(s) in RCA: 121] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Phospholipase C-gamma (PLC-gamma) isozymes are thought to be activated by receptor-induced tyrosine phosphorylation. Proteins that activate PLC-gamma1 have now been purified from bovine brain and identified as members of the tau family of microtubule-associated proteins. Activation of PLC-gamma by tau was enhanced in the presence of unsaturated fatty acids such as arachidonic acid, saturated fatty acids being ineffective. Maximal (15-20-fold) activation was apparent in the presence of 0.15 microM tau and 25 microM arachidonic acid (AA). The effect of tau and AA was specific to PLC-gamma isozymes in the presence of submicromolar concentrations of Ca2+ and was markedly inhibited by phosphatidylcholine. These results suggest that in cells that express tau, receptors coupled to cytosolic phospholipase A2 may activate PLC-gamma isozymes indirectly in the absence of tyrosine phosphorylation through the hydrolysis of phosphatidylcholine to generate AA.
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Affiliation(s)
- S C Hwang
- Laboratory of Cell Signaling, NHLBI, National Institutes of Health, Bethesda, Maryland 20892, USA
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Feng JF, Rhee SG, Im MJ. Evidence that phospholipase delta1 is the effector in the Gh (transglutaminase II)-mediated signaling. J Biol Chem 1996; 271:16451-4. [PMID: 8663582 DOI: 10.1074/jbc.271.28.16451] [Citation(s) in RCA: 139] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
A new class of GTP-binding protein transglutaminase II (Gh) couples to a 69-kDa phospholipase C (PLC). An 8-amino acid region (Leu665-Lys672) of the alpha-subunit of Gh (Galphah) is involved in interaction and activation of PLC, an observation that has now been used to characterize the 69-kDa PLC further. A 20-amino acid peptide corresponding to Leu654-Leu673 of Galphah was used to prepare an affinity resin. On incubation with a partially purified PLC preparation from rat liver membranes, the affinity resin-bound approximately69- and 85-kDa proteins were recognized by an antibody to the 69-kDa PLC. Both purified 69-kDa PLC and PLC-delta1 bound to the affinity resin; moreover, antibodies to PLC-delta1 recognized the 69-kDa PLC, and antibodies to the 69-kDa PLC recognized PLC-delta1. A synthetic peptide corresponding to Leu661-Lys672 of Galphah inhibited the binding of PLC-delta1 to the affinity resin and also stimulated PLC-delta1. Reconstitution of PLC-delta1 with GTPgammaS (guanosine 5'-3-O-(thio)triphosphate)-activated Gh resulted in activation of PLC-delta1. Antibodies to Galphah also coimmunoprecipitated PLC-delta1 upon activation of Gh. These findings indicate that PLC-delta1 is the effector of Gh-mediated signaling.
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Affiliation(s)
- J F Feng
- Department of Molecular Cardiology, Research Institute, The Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA
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McKay RR, Zhu L, Shortridge RD. A Drosophila gene that encodes a member of the protein disulfide isomerase/phospholipase C-alpha family. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 1995; 25:647-654. [PMID: 7787847 DOI: 10.1016/0965-1748(95)00001-c] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Screening of a Drosophila genomic DNA library at reduced stringency hybridization conditions using a rat PLC alpha cDNA probe yielded a gene which encodes a member of the protein disulfide isomerase/PLC alpha family. The gene has been localized to band 74C on the left arm of the third chromosome and has been designated dpdi. Northern analysis shows that the dpdi gene encodes a transcript that is 2.3 kb in length and is present throughout development as well as in both heads and bodies of adults. The deduced dpdi protein is 496 amino acids in length and contains two domains exhibiting high similarity to thioredoxin, two regions that are similar to the hormone binding domain of human estrogen receptor, and a sequence of four amino acids (KDEL) at the C-terminus which has been described by others as being responsible for retention of proteins in the endoplasmic reticulum. Overall, dpdi contains a higher similarity to rat protein disulfide isomerase (53% identical) than to rat PLC alpha (30% identical). However, it is unclear whether dpdi functions in vivo as a PDI or as a PLC, or both. Drosophila, with its well characterized genetics and the ability to generate mutants in a gene that has been cloned, provides an excellent system in which to resolve this issue.
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Affiliation(s)
- R R McKay
- Department of Biological Sciences, University of New York, Buffalo 14260, USA
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Medvedeva ND, Tsupkina NV, Nikolsky NN. A 66-kDa protein associated with epidermal growth factor receptor is a proteolytic fragment of phosphoinositide-specific phospholipase C. FEBS Lett 1994; 356:299-301. [PMID: 7805859 DOI: 10.1016/0014-5793(94)01276-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
It is shown that in the A431 cells, EGFR is co-immunoprecipitated with a group of proteins recognized by antibodies to phospholipase C gamma. These are 145- and 47-kDa proteins corresponding to phospholipase C gamma and Nck, respectively, and an unidentified 66-kDa protein. The association of phosphoinositide-specific phospholipase C gamma and 66-kDa protein to EGFR was observed in the A431 cells with or without the EGF treatment. Trypsin peptide maps of these two proteins are similar so it is assumed that the 66-kDa protein is related to phospholipase C gamma.
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Affiliation(s)
- N D Medvedeva
- Institute of Cytology, St. Petersburg, Russian Federation
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Expression and characterization of an inositol 1,4,5-trisphosphate binding domain of phosphatidylinositol-specific phospholipase C-delta 1. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)32143-9] [Citation(s) in RCA: 109] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Tompkins TA, Moscarello MA. The mechanism of stimulation of brain phospholipase C-alpha by myelin basic protein involves specific interactions. BIOCHIMICA ET BIOPHYSICA ACTA 1994; 1206:208-14. [PMID: 7516186 DOI: 10.1016/0167-4838(94)90210-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The modulation of a brain phosphoinositide-specific phospholipase C-alpha activity was studied using a variety of compounds of different charge. Detergents such as sodium deoxycholate and cetyltrimethylammonium bromide stimulated the phospholipase C activity when used alone but when used together the effects were not additive. Spermine was an effective inhibitor of the enzyme activity while the cationic peptide, Melittin, had no effect. The inositol phosphates produced by hydrolysis with phosphoinositide-specific phospholipase C were inhibitory while diacylglycerol and inositol did not affect the phospholipase activity. Myelin basic protein, which was previously shown to stimulate phospholipase C activity by 2.5-fold, did not interact with the anionic inositol phosphatases to any significant extent. Thus we concluded that the mechanism of stimulation was not due to relief of product inhibition. Crosslinking studies with the photoactivatable reagent, N-hydroxysuccinimidyl-4-azidosalicylic acid, showed that peptide 24-33 of myelin basic protein, which stimulated the activity almost as much as the native protein, interacted specifically with the phospholipase C. Thus the mechanism by which myelin basic protein stimulated the enzyme appeared to be through specific protein-protein interaction.
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Affiliation(s)
- T A Tompkins
- Department of Molecular Biology and Genetics, University of Guelph, Ont., Canada
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Wu CY, Chen CF, Chiang CF. Purification of phospholipase C from rat cerebral cortex. PREPARATIVE BIOCHEMISTRY 1994; 24:99-111. [PMID: 8072959 DOI: 10.1080/10826069408010085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Phospholipase C from rat cerebral cortex was purified to homogeneity by use of DEAE Bio-Gel A agarose, hydroxyapatite, and heparin agarose chromatography. The purified phospholipase C (PLC) was purified 622.4-fold and its molecular weight is estimated to be 97,500. We obtained a final specific activity of 3.112 mumol of phosphatidylinositol hydrolyzed/min/mg of protein. It is specific for inositol phospholipids. The purified enzyme has an apparent optimum pH 7.0. Calcium is required for its activity. Western blotting analysis showed that two proteins were recognized by anti-PLC antiserum.
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Affiliation(s)
- C Y Wu
- Department of Pharmacology, National Yang-Ming Medical College, Taipei, Taiwan, Republic of China
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Marrero M, Paxton W, Duff J, Berk B, Bernstein K. Angiotensin II stimulates tyrosine phosphorylation of phospholipase C-gamma 1 in vascular smooth muscle cells. J Biol Chem 1994. [DOI: 10.1016/s0021-9258(17)34147-9] [Citation(s) in RCA: 166] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Bolander FF. Calcium, Calmodulin, and Phospholipids. Mol Endocrinol 1994. [DOI: 10.1016/b978-0-12-111231-8.50014-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Das T, Baek KJ, Gray C, Im MJ. Evidence that the Gh protein is a signal mediator from alpha 1-adrenoceptor to a phospholipase C. II. Purification and characterization of a Gh-coupled 69-kDa phospholipase C and reconstitution of alpha 1-adrenoceptor, Gh family, and phospholipase C. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(19)74262-8] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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Martin JL, Reed GF, Pohl LR. Association of anti-58 kDa endoplasmic reticulum antibodies with halothane hepatitis. Biochem Pharmacol 1993; 46:1247-50. [PMID: 8216376 DOI: 10.1016/0006-2952(93)90474-b] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We recently showed that when rats were administered the inhalation anesthetic halothane, a 58 kDa liver endoplasmic reticulum protein became covalently trifluoroacetylated by the trifluoroacetyl chloride metabolite of halothane. Although the 58 kDa protein showed 99% identity to that of the deduced amino acid sequence of a cDNA reported to correspond to phosphatidylinositol-specific phospholipase C-alpha, it did not have phosphatidylinositol-specific phospholipase C activity. It was concluded that the reported cDNA of phosphatidylinositol-specific phospholipase C-alpha actually encoded for the 58 kDa endoplasmic reticulum protein of unknown function. Other researchers have come to the same conclusion and have shown that the 58 kDa protein has protein disulfide-isomerase and protease activities. We now report that patients with halothane hepatitis have serum antibodies that react with both purified trifluoroacetylated and native rat liver 58 kDa proteins. These results suggest that when patients are exposed to halothane a human liver orthologue of the rat liver trifluoroacetylated-58 kDa protein is formed. In certain patients, this protein may become immunogenic and lead to the formation of specific antibodies and or specific T-cells, which may react with both trifluoroacetylated and native 58 kDa proteins, and ultimately be responsible, at least in part, for the hepatitis caused by halothane.
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Affiliation(s)
- J L Martin
- Laboratory of Chemical Pharmacology, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892
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Leonis M, Silbert D. Characterization of a second hamster lung fibroblast mutant with defects in phosphatidylinositol-specific phospholipase C. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(18)98367-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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