1
|
Dolan AT, Diamond SL. Systems modeling of Ca(2+) homeostasis and mobilization in platelets mediated by IP3 and store-operated Ca(2+) entry. Biophys J 2014; 106:2049-60. [PMID: 24806937 DOI: 10.1016/j.bpj.2014.03.028] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 03/11/2014] [Accepted: 03/14/2014] [Indexed: 11/17/2022] Open
Abstract
Resting platelets maintain a stable level of low cytoplasmic calcium ([Ca(2+)]cyt) and high dense tubular system calcium ([Ca(2+)]dts). During thrombosis, activators cause a transient rise in inositol trisphosphate (IP3) to trigger calcium mobilization from stores and elevation of [Ca(2+)]cyt. Another major source of [Ca(2+)]cyt elevation is store-operated calcium entry (SOCE) through plasmalemmal calcium channels that open in response to store depletion as [Ca(2+)]dts drops. A 34-species systems model employed kinetics describing IP3-receptor, DTS-plasmalemma puncta formation, SOCE via assembly of STIM1 and Orai1, and the plasmalemma and sarco/endoplasmic reticulum Ca(2+)-ATPases. Four constraints were imposed: calcium homeostasis before activation; stable in zero extracellular calcium; IP3-activatable; and functional SOCE. Using a Monte Carlo method to sample three unknown parameters and nine initial concentrations in a 12-dimensional space near measured or expected values, we found that model configurations that were responsive to stimuli and demonstrated significant SOCE required high inner membrane electric potential (>-70 mV) and low resting IP3 concentrations. The absence of puncta in resting cells was required to prevent spontaneous store depletion in calcium-free media. Ten-fold increases in IP3 caused saturated calcium mobilization. This systems model represents a critical step in being able to predict platelets' phenotypes during hemostasis or thrombosis.
Collapse
Affiliation(s)
- Andrew T Dolan
- Institute for Medicine and Engineering, Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Scott L Diamond
- Institute for Medicine and Engineering, Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania.
| |
Collapse
|
2
|
Abstract
Platelet activation by thrombin and most other agonists appears to require two second messenger systems that are both initiated by phospholipase C-catalysed cleavage of phosphatidylinositol phosphates leading to: 1. formation of inositol phosphates with a subsequent rise in intracellular calcium from intracellular stores and from outside the cell; 2. formation of diacylglycerol with subsequent activation of protein kinase C. This review examines inositol phosphate metabolism in platelets and its involvement in calcium metabolism.
Collapse
Affiliation(s)
- J L Daniel
- Department of Pharmacology and Thrombosis Research Center, Temple University, Medical School, Philadelphia, PA, USA
| |
Collapse
|
3
|
Kawamura M, Huang A, Harada Y, Katori M. Activation of Phospholipase C as a Primary Target of the Thromboxane A2-mediated Amplification Mechanism in Thrombin-induced Rabbit Platelet Activation. Platelets 2009; 5:20-8. [DOI: 10.3109/09537109409006037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
4
|
A molecular signaling model of platelet phosphoinositide and calcium regulation during homeostasis and P2Y1 activation. Blood 2008; 112:4069-79. [PMID: 18596227 DOI: 10.1182/blood-2008-05-157883] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
To quantify how various molecular mechanisms are integrated to maintain platelet homeostasis and allow responsiveness to adenosine diphosphate (ADP), we developed a computational model of the human platelet. Existing kinetic information for 77 reactions, 132 fixed kinetic rate constants, and 70 species was combined with electrochemical calculations, measurements of platelet ultrastructure, novel experimental results, and published single-cell data. The model accurately predicted: (1) steady-state resting concentrations for intracellular calcium, inositol 1,4,5-trisphosphate, diacylglycerol, phosphatidic acid, phosphatidylinositol, phosphatidylinositol phosphate, and phosphatidylinositol 4,5-bisphosphate; (2) transient increases in intracellular calcium, inositol 1,4,5-trisphosphate, and G(q)-GTP in response to ADP; and (3) the volume of the platelet dense tubular system. A more stringent test of the model involved stochastic simulation of individual platelets, which display an asynchronous calcium spiking behavior in response to ADP. Simulations accurately reproduced the broad frequency distribution of measured spiking events and demonstrated that asynchronous spiking was a consequence of stochastic fluctuations resulting from the small volume of the platelet. The model also provided insights into possible mechanisms of negative-feedback signaling, the relative potency of platelet agonists, and cell-to-cell variation across platelet populations. This integrative approach to platelet biology offers a novel and complementary strategy to traditional reductionist methods.
Collapse
|
5
|
Is Intervention in Inositol Phosphate Signaling a Useful Therapeutic Option for Cystic Fibrosis? ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2007. [DOI: 10.1007/0-387-23250-8_8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
6
|
Exton JH. The roles of calcium and phosphoinositides in the mechanisms of alpha 1-adrenergic and other agonists. Rev Physiol Biochem Pharmacol 2005; 111:117-224. [PMID: 2906170 DOI: 10.1007/bfb0033873] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
7
|
Shears SB, Yang L, Qian X. Cell signaling by a physiologically reversible inositol phosphate kinase/phosphatase. ACTA ACUST UNITED AC 2005; 44:265-77. [PMID: 15581495 DOI: 10.1016/j.advenzreg.2004.02.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Stephen B Shears
- Laboratory of Signal Transduction, Inositol Signaling Section, National Institute of Environmental Health Sciences, NIH/DHHS, Research Triangle Park, NC 27709, USA.
| | | | | |
Collapse
|
8
|
Mandal S, Richardson VJ, Banoub J, Church JG. Identification of myo-inositol 1,2-cyclic monophosphate by electrospray tandem mass spectrometry, a major constituent of EGF-stimulated phosphoinositide turnover in MDA 468 cells. Exp Cell Res 2002; 277:131-8. [PMID: 12083795 DOI: 10.1006/excr.2002.5549] [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: 12/31/2022]
Abstract
Epidermal growth factor (EGF) caused an increase in phosphoinositide (PI) turnover in MDA 468 cells. This EGF-stimulated effect was inhibited by the protein tyrosine kinase inhibitor lavendustin A (LA). MDA 468 cells generated an atypical PI turnover profile. Examination and quantitation of the PI metabolite profile showed that even control cells produced a metabolite which was acid-labile and which formed about 60% of the total PI metabolites. By using the technique of electrospray ionization tandem mass spectrometry, we were able to confirm the identity of this acid-labile metabolite through the specific fragmentation as compared with the standard. The precursor molecule fragmented into two distinct productions with molar masses identical to that of the standard myo-inositol 1,2-cyclic monophosphate (cInsP). Changes in the PI turnover profile could be accounted for by the alterations in myo-inositol 1,2-cyclic monophosphate generated in these cells. We thus conclude that, by some as-yet-unidentified mechanism, cyclic inositol monophosphate forms a major constituent of EGF-stimulated PI turnover in MDA 468 cells.
Collapse
Affiliation(s)
- Soma Mandal
- Terry Fox Cancer Research Laboratories, Memorial University of Newfoundland, St. John's, Canada A1B 3V6
| | | | | | | |
Collapse
|
9
|
Ho MW, Shears SB. Regulation of calcium-activated chloride channels by inositol 3,4,5,6 tetrakisphosphate. CURRENT TOPICS IN MEMBRANES 2002. [DOI: 10.1016/s1063-5823(02)53041-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
|
10
|
Shiraishi M, Ikeda M, Fujishiro T, Fukuyama K, Ito K. Characteristics of collagen-induced Ca2+ mobilization in bovine platelets. Cell Calcium 2000; 27:53-60. [PMID: 10726211 DOI: 10.1054/ceca.1999.0089] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We characterized the collagen-induced increase in cytosolic Ca2+ ([Ca2+]i) of bovine platelets loaded with the Ca2+ indicator Fura-PE3/AM. Collagen (10 micrograms/ml)-induced increase in [Ca2+]i was only partially inhibited by aspirin, a cyclooxygenase inhibitor, or adenosine 3'-phosphate 5'-phosphosulfate (A3P5PS, a P2Y1 receptor antagonist), while in human platelets it was almost completely suppressed by aspirin. Collagen-induced increase in [Ca2+]i of bovine platelets was inhibited by U73122 (0.3-5 microM), a phospholipase C inhibitor. Collagen (10 micrograms/ml) increased production of inositol 1,4,5-trisphosphate, which was prevented by pretreatment with U73122 (5 microM). Collagen (10 micrograms/ml) accelerated Mn2+ entry, since the rate of Fura-PE3 quenching by Mn2+ was enhanced by 13-fold following stimulation with collagen. U73122 inhibited the acceleration of Mn2+ entry induced by collagen. PGE1 (2.5 microM) partially inhibited the collagen (50 micrograms/ml)-induced increase in [Ca2+]i in bovine platelets but not in human platelets. The data suggest that collagen-induced Ca2+ mobilization in bovine platelets is mediated by phospholipase C. The Ca2+ mobilization in bovine platelets is different from that in human ones as to the dependency on arachidonic acid metabolites and sensitivity to PGE1.
Collapse
Affiliation(s)
- M Shiraishi
- Department of Veterinary Pharmacology, Miyazaki University, Japan
| | | | | | | | | |
Collapse
|
11
|
Luzzi V, Sims CE, Soughayer JS, Allbritton NL. The physiologic concentration of inositol 1,4,5-trisphosphate in the oocytes of Xenopus laevis. J Biol Chem 1998; 273:28657-62. [PMID: 9786859 DOI: 10.1074/jbc.273.44.28657] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
To measure the concentration of inositol 1,4,5-trisphosphate ([IP3]) in small regions of single Xenopus oocytes, a biological detector cell was combined with capillary electrophoresis. This method is 10, 000 times more sensitive than all existing assays enabling subcellular measurement of [IP3] in Xenopus oocytes. Upon addition of lysophosphatidic acid to an oocyte, [IP3] increased from 40 to 650 nM within 2 min. IP3 concentrations as high as 1.8 microM were measured after activation with lysophosphatidic acid, suggesting that the physiologic concentration of IP3 ranges from the tens of nanomolar to a few micromolar in Xenopus oocytes. Since the IP3 receptor in Xenopus oocytes is nearly identical to the type I receptor of mammalian cells, the range of [IP3] in most mammalian cells is likely to be similar to that in the oocyte. By selecting or engineering the appropriate detector cell, this strategy should be applicable to cyclic adenosine diphosphate ribose and nicotinic acid adenine dinucleotide phosphate, and to the discovery of new Ca2+-releasing second messengers.
Collapse
Affiliation(s)
- V Luzzi
- Department of Physiology and Biophysics University of California, Irvine, California 92697-4560, USA
| | | | | | | |
Collapse
|
12
|
Rivera J, Lozano ML, Gonzalez-Conejero R, Corral J, De Arriba F, Vicente V. A radioreceptor assay for mass measurement of inositol (1,4,5)-trisphosphate using saponin-permeabilized outdated human platelets. Anal Biochem 1998; 256:117-21. [PMID: 9466804 DOI: 10.1006/abio.1997.2488] [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: 02/06/2023]
Abstract
The binding of inositol 1,4,5-trisphosphate [Ins(1,4,5)P3] to saponin-permeabilized blood-bank-outdated human platelets, 6 days old, has been characterized (Kd = 3.8 nM; Bmax = 1.7 pmol/mg protein) and used to develop a novel radioreceptor assay which allows the measurement of the Ins(1,4,5)P3 content in resting or agonist-stimulated cells. This assay is as sensitive (0.25 pmol in a 0.25 ml volume), specific, and reproducible as previously proposed methods. In addition, obtaining large batches of the Ins(1,4,5)P3 binding protein by treating outdated platelets with saponin is simple and quick and uses otherwise discarded material. Moreover, the assay is considerably cheaper than commercially available kits. Using this method we confirmed that thrombin evokes a rapid, transient, and dose-dependent increase in the platelet concentration of Ins(1,4,5)P3.
Collapse
Affiliation(s)
- J Rivera
- Unit of Hematology and Hemotherapy, School of Medicine, Hospital General Universitario, Murcia, Spain
| | | | | | | | | | | |
Collapse
|
13
|
Sekar MC, Scott ED, Sambandam V, Berry RE. Demonstration of the presence of cyclic inositol phosphohydrolase in human urine. BIOCHEMICAL AND MOLECULAR MEDICINE 1997; 62:95-100. [PMID: 9367804 DOI: 10.1006/bmme.1997.2629] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Cyclic inositol phosphohydrolase (cIPH), cleaves the cyclic bond of cyclic inositol monophosphate (cIP) to yield inositol monophosphate. In this communication, we demonstrate the presence of cIPH in human urine. cIPH was measured in the 24-h urine samples of both male and female hospital patients. cIPH released per day ranged from 0 to 243 units in men (n = 16) and from 15 to 346 units in women (n = 18). Release of cIPH activity was not related to renal function as measured by creatinine clearance. HPLC ion-exchange chromatography or HPLC gel filtration of ammonium sulfate precipitate yielded a distinct cIPH peak with an apparent molecular weight of 40 kDa on gel filtration. This is the first demonstration of the presence of this enzyme in human urine. The large variation (over 20-fold) in the excretion of this protein suggests that it may have physiological and/or pathological significance.
Collapse
Affiliation(s)
- M C Sekar
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA
| | | | | | | |
Collapse
|
14
|
Xu X, Zeng W, Muallem S. Regulation of the inositol 1,4,5-trisphosphate-activated Ca2+ channel by activation of G proteins. J Biol Chem 1996; 271:11737-44. [PMID: 8662624 DOI: 10.1074/jbc.271.20.11737] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Streptolysin O-permeable pancreatic acini were used to study the regulation of the inositol 1,4,5-trisphosphate (IP3)-activated Ca2+ channel (IPACC) by agonists and antagonists. Measurements of the apparent affinity for IP3 (KappIP3) showed that the IPACC is dynamically controlled during cell stimulation and inhibition, i.e. agonists decreased and antagonists increased KappIP3. KappIP3 was also independently regulated by thimerosal, Ca2+ content of the stores, the incubation temperature, activation of protein kinases, and inhibition of protein phosphatases, but none of these mechanisms contributed to the regulation by agonists and antagonists. Incubating the cells with low concentration of GTPgammaS or AIF3 reproduced the effect of the agonist on KappIP3. Moreover, low [GTPgammaS] allowed activation of the IPACC by agonists at basal levels of IP3 and markedly impaired channel inactivation by antagonists. Channel sensitization by GTPgammaS also restored the ability of thimerosal to mobilize Ca2+ from internal stores with no change in cellular IP3 levels. The combination of low [GTPgammaS] and thimerosal locked the channel in an open, antagonist-insensitive state. All modulatory effects of GTPgammaS are independent of phospholipase C activation and IP3 production. We propose that the dynamic regulation of the IPACC by a G protein-dependent mechanism can play a major role in triggering and maintaining Ca2+ oscillations at low agonist concentrations when minimal or no changes in IP3 level take place.
Collapse
Affiliation(s)
- X Xu
- Department of Physiology, University of Texas Southwestern Medical School, Dallas 75235, USA
| | | | | |
Collapse
|
15
|
Sekar MC, Sambandam V, Grizzle WE, McDonald JM. Dissociation of cyclic inositol phosphohydrolase activity from annexin III. J Biol Chem 1996; 271:8295-9. [PMID: 8626524 DOI: 10.1074/jbc.271.14.8295] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Cyclic inositol phosphohydrolase is a phosphodiesterase that cleaves the cyclic bond of cyclic inositol monophosphate. In 1990, Ross et al. (Ross, T. S., Tait, J. F., and Majerus, P. W. (1990) Science 248, 605-607) purified this enzyme from human placenta and reported that cyclic inositol phosphohydrolase is identical to annexin III. Independent confirmation of this finding has not been provided. The relative distribution of annexin III and cyclic inositol phosphohydrolase activity in rat kidney and spleen indicated that annexin III can be dissociated from cyclic inositol phosphohydrolase activity. Rat spleen contains large quantities of annexin III, but has very little cyclic inositol phosphohydrolase activity. In contrast, rat kidney, one of the richest sources of cyclic inositol phosphohydrolase activity, possesses very little (immunohistochemistry) or no (Western blot) annexin III. Similar to cytosol of human placenta, cytosol of guinea pig kidney contains both annexin III and cyclic inositol phosphohydrolase. On SDS-gel electrophoresis, guinea pig kidney annexin III has a slightly different mobility than the human placental annexin III. Human placental annexin III co-migrates with cyclic inositol phosphohydrolase on ion exchange chromatography, while guinea pig kidney annexin III is clearly dissociated from cyclic inositol phosphohydrolase on ion exchange chromatography. Both guinea pig kidney annexin III and human placental annexin III pellet with the addition of calcium and centrifugation, while cyclic inositol phosphohydrolase activity in both of these tissues remains in the supernatant. Our studies clearly show that cyclic inositol phosphohydrolase and annexin III are two different proteins.
Collapse
Affiliation(s)
- M C Sekar
- Department of Pathology, University of Alabama at Birmingham, 35294, USA
| | | | | | | |
Collapse
|
16
|
Shears SB. Inositol pentakis- and hexakisphosphate metabolism adds versatility to the actions of inositol polyphosphates. Novel effects on ion channels and protein traffic. Subcell Biochem 1996; 26:187-226. [PMID: 8744266 DOI: 10.1007/978-1-4613-0343-5_7] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- S B Shears
- Inositol Lipid Section, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709, USA
| |
Collapse
|
17
|
Singh AK, Jiang Y. Quantitative chromatographic analysis of inositol phospholipids and related compounds. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL APPLICATIONS 1995; 671:255-80. [PMID: 8520695 DOI: 10.1016/0378-4347(94)00558-m] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The metabolism of phospholipids and the mobilization of second messengers such as inositol-1,4,5-trisphosphate, 1,2-diacylglycerol (DAG) and arachidonic acid (AA) from phospholipids is commonly studied by radiolabelling phospholipids with [3H]myo-inositol or [32P]ATP and measuring the incorporation of radioactivity in different phospholipids or their hydrolysis products. However, for the radiolabelling method to accurately reflect changes in the compound's mass, it is essential that the tissue is labelled to isotopic equilibrium which is difficult to achieve. To circumvent the disadvantages of the radiolabelling method, several analytical procedures have been developed for the mass analysis of phospholipids and inositolphosphates (IPs). Quantitation of the mass or the radiolabelling of phospholipids is a complex multi-step procedure that involves quantitative isolation of phospholipids, fractionation of individual phospholipids and either determination of radioactivity in each component or the measurement of their mass. Phospholipids, DAG and AA are extracted from tissue sample with organic solvents such as chloroform-methanol (2:1) containing HCl or formic acid. The extract is separated by TLC, cartridge-column chromatography or HPLC on a reversed-phase column. Phospholipids are quantitated by measuring inorganic phosphate, absorption at 200 nm or mass spectrometry. Inositol phosphates are extracted with perchloric acid or trichloroacetic acid and separated by ion-exchange cartridge-column or HPLC with an ion-exchange column. IPs are quantitated by measuring inorganic phosphate or by using enzymatic reaction, metal-dye coupling, NMR or mass spectrometry.
Collapse
Affiliation(s)
- A K Singh
- Department of Veterinary Diagnostic Medicine, College of Veterinary Medicine, University of Minnesota, St. Paul 55108, USA
| | | |
Collapse
|
18
|
Thastrup O, Dawson AP, Scharff O, Foder B, Cullen PJ, Drøbak BK, Bjerrum PJ, Christensen SB, Hanley MR. Thapsigargin, a novel molecular probe for studying intracellular calcium release and storage. 1989. AGENTS AND ACTIONS 1994; 43:187-93. [PMID: 7725971 DOI: 10.1007/bf01986687] [Citation(s) in RCA: 69] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
|
19
|
|
20
|
Abstract
By virtue of their biological simplicity and widespread availability, platelets frequently have been used as a model system to study signal transduction. Such studies have revealed that changes in intracellular free calcium concentration are central to platelet functioning. The following article reviews current concepts of platelet structure and function, with particular emphasis on the mechanisms involved in platelet Ca2+ signalling.
Collapse
Affiliation(s)
- P Sargeant
- Physiological Laboratory, Cambridge University, U.K
| | | |
Collapse
|
21
|
Tate BF, Rittenhouse SE. Thrombin activation of human platelets causes tyrosine phosphorylation of PLC-gamma 2. BIOCHIMICA ET BIOPHYSICA ACTA 1993; 1178:281-5. [PMID: 7689859 DOI: 10.1016/0167-4889(93)90205-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Human platelets contain phospholipase C (PLC)-gamma 2, a distinct isoform closely related to PLC-gamma 1. Both inositol phospholipid-specific phospholipases C contain the src-related SH2 regions. Stimulation of platelets with the potent agonist, thrombin, led to a rapid and transient phosphorylation of PLC-gamma 2 on tyrosine residues. Activated platelets lysed in the absence of sodium orthovanadate had levels of tyrosine-phosphorylated PLC-gamma 2 paralleling those seen in unstimulated platelets. Previously, it had been shown that PLC-gamma 1 was phosphorylated on tyrosine residues by the agonist-occupied platelet-derived growth factor (PDGF) receptor and epidermal growth factor (EGF) receptor in cells other than platelets. In addition, more recent data have indicated that PLC-gamma 2 is also capable of being tyrosine-phosphorylated in cells of hematopoietic origin, such as B cells and natural killer (NK) cells. Here we report that PLC-gamma 2 expressed in a terminally-differentiated hematopoietic cell is also tyrosine-phosphorylated in response to an agonist.
Collapse
Affiliation(s)
- B F Tate
- Department of Toxicology, Hoffmann-La Roche Inc., Nutley, NJ
| | | |
Collapse
|
22
|
Ishima Y, Fujimagari M, Masuzawa Y, Waku K. Inositol 1,4,5-trisphosphate accumulation in brain of lithium-treated rats. Lipids 1993; 28:577-81. [PMID: 8394976 DOI: 10.1007/bf02536049] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The mechanism of action of lithium as a drug for patients with affective disorders was investigated. Three-week-old male rats were orally administered 2.7 mEq Li2CO3/kg/d for 1 or 3 wk, and phosphatidylinositol (PI), phosphatidylinositol 4-phosphate (PIP), phosphatidylinositol 4,5-bisphosphate (PIP2), inositol phosphate (IP), inositol diphosphate (IP2) and inositol triphosphate (IP3) levels in brain were measured. The levels of IP were increased 1.7 and 2.4 times after 1 wk and 3 wk of lithium administration, respectively, while PI, PIP, PIP2, IP2 and IP3 levels were not altered. IP3 was further fractionated by high-performance liquid chromatography into I-1,3,4-P3 and I-1,4,5-P3. In the control rat brain, the relative percentages of I-1,3,4-P3 and I-1,4,5-P3 were 95.8 and 4.2, respectively. However, after 3 wk of lithium administration, the values were changed to 69.6 and 30.3%, respectively. This increase in the neurotransducer I-1,4,5-P3 in the brain may be relevant to the mechanism of action in the lithium treatment of patients with manic-depressive disorders.
Collapse
Affiliation(s)
- Y Ishima
- Department of Neuropsychiatry, Ibaraki Prefectural Hospital, Japan
| | | | | | | |
Collapse
|
23
|
Measurement of Inositol 1,4,5-Trisphosphate, Inositol 1,3,4,5-Tetrakisphosphate, and Phosphatidylinositol 4,5-Bisphosphate in Brain. ACTA ACUST UNITED AC 1993. [DOI: 10.1016/b978-0-12-185285-6.50027-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
|
24
|
Authi KS. Ca2+ homeostasis and intracellular pools in human platelets. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1993; 344:83-104. [PMID: 8209795 DOI: 10.1007/978-1-4615-2994-1_7] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- K S Authi
- Platelet Section, Thrombosis Research Institute, London, U.K
| |
Collapse
|
25
|
Baron CB, Pompeo JN, Azim S. Inositol 1,4,5-trisphosphate compartmentalization in tracheal smooth muscle. Arch Biochem Biophys 1992; 292:382-7. [PMID: 1731607 DOI: 10.1016/0003-9861(92)90006-i] [Citation(s) in RCA: 12] [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
Pool sizes of inositol phosphate species in myo-[3H]inositol-labeled porcine tracheal smooth muscle were determined under three conditions: (a) unstimulated; (b) stimulated with carbachol; (c) atropine-relaxed from a carbachol contraction. In unstimulated muscle, the inositol 1,4,5-trisphosphate (Ins(1,4,5)P3) content was 14 pmol/100 nmol lipid P1. This is equivalent to a mean [Ins(1,4,5)P3] of about 3 microM (in total cellular water), a level about 30-fold in excess of that required for Ca2+ release from Ins(1,4,5)P3-sensitive sarcoplasmic reticulum (SR). Pool sizes of breakdown products of Ins(1,4,5)P3 were relatively small or absent in unstimulated muscle, suggesting that, under this condition, Ins(1,4,5)P3 was sequestered and had limited access to Ins(1,4,5)P3 5-phosphatase and/or 3-kinase. During carbachol stimulation, the Ins(1,4,5)P3 pool did not increase while those of other mono-, di-, and trisphosphate isomers increased over 10-fold. Subsequent atropine-induced relaxation resulted in a partial depletion (40%) of total tissue Ins(1,4,5)P3. Decreases in Ins(1,4,5)P3 were paralleled by decreases in Ins(1,4)P2 and Ins(1,3,4)P3. During contraction a portion of total tissue Ins(1,4,5)P3 has access to Ins(1,4,5)P3 3-kinase and 5-phosphatase and to Ins(1,4,5)P3-sensitive SR, though during antagonist-induced relaxation access to Ins(1,4,5)P3-sensitive SR for Ca2+ release is restricted. Data are consistent with a mechanism by which a large pool of Ins(1,4,5)P3 present in the unstimulated state in a sequestered compartment can contribute in activated muscle to increases in [Ins(1,4,5)P3] in a nonsequestered compartment, controlling SR Ca2+ release.
Collapse
Affiliation(s)
- C B Baron
- Department of Physiology, University of Pennsylvania School of Medicine, Philadelphia 19104-6085
| | | | | |
Collapse
|
26
|
Huang R, Sorisky A, Church W, Simons E, Rittenhouse S. “Thrombin” receptor-directed ligand accounts for activation by thrombin of platelet phospholipase C and accumulation of 3-phosphorylated phosphoinositides. J Biol Chem 1991. [DOI: 10.1016/s0021-9258(18)55079-1] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
|
27
|
Kroegel C, Chilvers ER, Giembycz MA, Challiss RA, Barnes PJ. Platelet-activating factor stimulates a rapid accumulation of inositol (1,4,5)trisphosphate in guinea pig eosinophils: relationship to calcium mobilization and degranulation. J Allergy Clin Immunol 1991; 88:114-24. [PMID: 2071775 DOI: 10.1016/0091-6749(91)90308-b] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The effect of platelet-activating factor (PAF) on inositol (1,4,5)trisphosphate (Ins[1,4,5]P3) mass, calcium mobilization, and the release of granule enzymes was studied on guinea pig peritoneal eosinophils (EOSs). PAF evoked a concentration-dependent accumulation of Ins(1,4,5)P3 with a drug concentration that elicits 50% of the maximum attainable response (EC50) of 10 nmol/L; the production of this second messenger was maximal at 1 mumol/L of PAF. Kinetic analysis of PAF (1 mumol/L)-induced Ins(1,4,5)P3 accumulation demonstrated it to be transient with a 3.8-fold increase over resting levels observed at 5 seconds. Thereafter, the level of Ins(1,4,5)P3 declined, returning to vehicle-treated levels 60 seconds after PAF challenge. Lyso-PAF, the inactive precursor and metabolite of PAF, was inactive at all concentrations examined. PAF also induced a rapid, concentration-dependent (EC50, 12 nmol/L) rise in the cytosolic-free calcium concentration ([Ca++]i) in fura 2-AM-loaded EOSs that was transient, peaking after the maximum increase in Ins(1,4,5)P3 mass was observed. A highly significant positive correlation was found between the peak increase in Ins(1,4,5)P3 and the peak rise in [Ca++]i. Functionally, PAF evoked a concentration-dependent release of granule constituents from both the small (arylsulfatase B; EC50, 3 nmol/L) and specific (EOS peroxidase; EC50, 2.7 nmol/L) granules that lagged, temporally, behind both Ins(1,4,5)P3 accumulation and the rise in [Ca++]i. Both the biochemical and functional effects of PAF examined in this study were antagonized by WEB 2086 (300 nmol/L), a selective PAF receptor-blocking drug. It is concluded that stimulus (PAF)-response coupling in guinea pig peritoneal EOSs may involve the receptor-mediated formation of Ins(1,4,5)P3 and subsequent release of intracellularly stored Ca++. This sequence of events may link PAF receptor activation to Ca(++)-dependent cellular responses, such as degranulation.
Collapse
Affiliation(s)
- C Kroegel
- Department of Thoracic Medicine, National Heart & Lung Institute, Royal Brompton and National Heart and Lung Hospital, London, England
| | | | | | | | | |
Collapse
|
28
|
Majerus PW, Bansal VS, Lips DL, Ross TA, Mitchell CA, Caldwell KK, Cunningham TW. The phosphatidylinositol pathway of platelets and vascular cells. Ann N Y Acad Sci 1991; 614:44-50. [PMID: 2024892 DOI: 10.1111/j.1749-6632.1991.tb43690.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- P W Majerus
- Washington University School of Medicine, Division of Hematology-Oncology, St. Louis, Missouri 63110
| | | | | | | | | | | | | |
Collapse
|
29
|
Nahorski SR, John Challiss R. Modulation of receptor-mediated inositol phospholipid breakdown in the brain. Neurochem Int 1991. [DOI: 10.1016/0197-0186(91)90002-u] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
30
|
|
31
|
Shears SB. Regulation of the metabolism of 1,2-diacylglycerols and inositol phosphates that respond to receptor activation. Pharmacol Ther 1991; 49:79-104. [PMID: 1649478 DOI: 10.1016/0163-7258(91)90023-f] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
This review assimilates information on the regulation of the metabolism of those inositol phosphates and diacylglycerols that respond to receptor activation. Particular emphasis is placed on the regulation of specific enzymes, the occurrence of isoenzymes, and metabolic compartmentalization; the overall aim is to demonstrate the significance of these activities in relation to the physiological impact of the various cell signalling processes.
Collapse
Affiliation(s)
- S B Shears
- Inositol Lipid Section, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709
| |
Collapse
|
32
|
Abstract
Inositol 1,4,5-trisphosphate (Ins(1,4,5)P3) is a soluble intracellular messenger formed rapidly after activation of a variety of cell-surface receptors that stimulate phosphoinositidase C activity. The initial response to Ins(1,4,5)P3 is a rapid Ca2+ efflux from nonmitochondrial intracellular stores which are probably specialized subcompartments of the endoplasmic reticulum, although their exact identities remain unknown. This initial response is followed by more complex Ca2+ signals: regenerative Ca2+ waves propagate across the cell, repetitive Ca2+ spikes occur, and stimulated Ca2+ entry across the plasma membrane contributes to the sustained Ca2+ signal. The mechanisms underlying these complex Ca2+ signals are unknown, although Ins(1,4,5)P3 is clearly involved. The intracellular receptor that mediates Ins(1,4,5)P3-stimulated Ca2+ mobilization has been purified and functionally reconstituted, and its amino acid sequence deduced from its cDNA sequence. These studies demonstrate that the Ins(1,4,5)P3 receptor has an integral Ca2+ channel separated from the Ins(1,4,5)P3 binding site by a long stretch of residues some of which form binding sites for allosteric regulators, and some of which are substrates for phosphorylation. In this review, we discuss the ligand recognition characteristics of Ins(1,4,5)P3 receptors, and their functional properties in their native environment and after purification, and we relate these properties to what is known of the structure of the receptor. In addition to regulation by Ins(1,4,5)P3, the Ins(1,4,5)P3 receptor is subject to many additional regulatory influences which include Ca2+, adenine nucleotides, pH and phosphorylation by protein kinases. Many of the functional and structural characteristics of the Ins(1,4,5)P3 receptor show striking similarities to another intracellular Ca2+ channel, the ryanodine receptor. These properties of the Ins(1,4,5)P3 are discussed, and their possible roles in contributing to the complex Ca2+ signals evoked by extracellular stimuli are considered.
Collapse
Affiliation(s)
- C W Taylor
- Department of Pharmacology, Cambridge, U.K
| | | |
Collapse
|
33
|
Zhao H, Khademazad M, Muallem S. Agonist-mediated Ca2+ release in permeabilized UMR-106-01 cells. Transport properties and generation of inositol 1,4,5-trisphosphate. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(18)77188-3] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
|
34
|
Krüger H, Schröder W, Buchner K, Hucho F. Protein kinase C inhibition by calmodulin and its fragments. JOURNAL OF PROTEIN CHEMISTRY 1990; 9:467-73. [PMID: 2275756 DOI: 10.1007/bf01024623] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Inhibition of protein kinase C (PKC) by calmodulin is investigated and we describe the localization of inhibitory sequences within the calmodulin molecule. We present evidence that calmodulin inhibits PKC through an inhibition of the activation of PKC associated with lipid membranes: Binding of PKC to lipid vesicles is not affected, but activation is abolished. The potent calmodulin antagonist R24571 (calmidazol) did not affect the inhibition of PKC by calmodulin at concentrations up to 10(-5) M. Two tryptic fragments of calmodulin were isolated which inhibited PKC. They were only slightly less potent than intact calmodulin with an IC50 of 6 microM compared to 1 microM of intact calmodulin. They were identified as Ser38-Arg74 and His107-Lys148. Each of the inhibiting fragments contains an intact Ca2(+)-binding domain with complete helix-loop-helix structure ("EF hand"). Other calmodulin peptides showed only weak inhibitory activity. Both fragments did not stimulate cAMP phosphodiesterase even at concentrations 100-fold higher than the calmodulin concentration needed for maximal stimulation. None of the fragments acted as a calmodulin antagonist.
Collapse
Affiliation(s)
- H Krüger
- Institut für Biochemie, Freie Universität Berlin, F.R.G
| | | | | | | |
Collapse
|
35
|
Nibbering PH, Zomerdijk TP, van Haastert PJ, van Furth R. A competition binding assay for determination of the inositol (1,4,5)-trisphosphate content of human leucocytes. Biochem Biophys Res Commun 1990; 170:755-62. [PMID: 2383266 DOI: 10.1016/0006-291x(90)92155-s] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We developed a competition binding assay for estimation of the intracellular inositol (1,4,5)-trisphosphate (Ins(1,4,5)P3) and optimalized it for the measurement of the Ins(1,4,5)P3 content of human blood leucocytes. The present method is considerably cheaper and requires five times fewer cells than the commercial Ins(1,4,5)P3 kit. The mean Ins(1,4,5)P3 content of human blood monocytes, granulocytes, and lymphocytes amounted to 3.3 +/- 1.2 microM, 3.1 +/- 1.4 microM, and 4.6 +/- 1.5 microM, respectively. After stimulation with formyl-methionyl-leucyl-phenylalanine (f-MLP) the Ins(1,4,5)P3 content of human granulocytes and monocytes increased 2-3 times within 10 sec and then gradually decreased, returning to basal values at 60 sec. Lymphocytes did not respond to f-MLP with an increase in their Ins(1,4,5)P3 content.
Collapse
Affiliation(s)
- P H Nibbering
- Dept. of Infectious Diseases, University Hospital, Leiden, The Netherlands
| | | | | | | |
Collapse
|
36
|
Kucera GL, Rittenhouse SE. Human platelets form 3-phosphorylated phosphoinositides in response to alpha-thrombin, U46619, or GTP gamma S. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(19)39361-5] [Citation(s) in RCA: 155] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
37
|
Waldenström A, Ronquist G, Carlsson L, Sabler E, Baldesten A, Sirén M. Analysis of free inositol trisphosphate in heart tissue by FPLC and isotachophoresis. BIOCHIMICA ET BIOPHYSICA ACTA 1990; 1051:185-91. [PMID: 2310770 DOI: 10.1016/0167-4889(90)90192-g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Recent, increasing interest in inositol tris(1,4,5)phosphate (IP3) turnover and metabolism has led to a need for a fast and quantitative determination of this compound in various tissues. These requirements are fulfilled by separation in different steps (FPLC and Sephadex G-10) culminating in further separation and quantification by isotachophoresis. Isotachophoresis means a migration of ion species of the same sign in an electrical field with all ions moving with the same velocity. The migration takes place when an electrical field is applied to a system of electrolytes of specific design. Detection was carried out by monitoring conductivity changes. The method is highly sensitive and allows measurements of IP3 in the pmolar range. Linearity was demonstrated over a wide range, 50-4500 pmol. The total imprecision was low with a coefficient of variation of 3%. When determining in biological tissue the recovery was estimated to be close to 100%. The mean content of IP3 in 15 rat heart specimens was 44.3 pmol/mg dry weight corresponding to tissue samples in the order of 4 mg wet weight. By noradrenaline stimulation myocardial content of IP3 increased by 50%.
Collapse
Affiliation(s)
- A Waldenström
- Department of Internal Medicine, University Hospital, Uppsala, Sweden
| | | | | | | | | | | |
Collapse
|
38
|
|
39
|
Putney JW. The integration of receptor-regulated intracellular calcium release and calcium entry across the plasma membrane. CURRENT TOPICS IN CELLULAR REGULATION 1990; 31:111-27. [PMID: 1978823 DOI: 10.1016/b978-0-12-152831-7.50004-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- J W Putney
- Laboratory of Cellular and Molecular Pharmacology, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709
| |
Collapse
|
40
|
Bansal VS, Caldwell KK, Majerus PW. The isolation and characterization of inositol polyphosphate 4-phosphatase. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(19)40089-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
41
|
Abstract
This review summarises the methods available for the mass measurement of inositol phosphates, i.e., use of radioactive inositol lipid precursors, optical techniques, gas chromatography, mass spectrometry, nuclear magnetic resonance, fast atom bombardment and assays specific for Ins(1,4,5)P3. Examples of the use of each method, its sensitivity, advantages and drawbacks are given.
Collapse
Affiliation(s)
- S Palmer
- Department of Biochemistry, University of Glasgow, U.K
| | | |
Collapse
|
42
|
Abstract
Interest in the inositol phospholipids was stimulated by the simultaneous discoveries that the products of hydrolysis of these lipids could serve as messengers to activate to synergistic signaling pathways in hormonally responsive cells, namely, inositol 1,4,5-trisphosphate which causes the release of Ca2+ from intracellular stores and diacylglycerol which promotes the activation of protein kinase C. At the same time, Berridge and co-workers introduced relatively simple approaches to study the inositol phospholipid cycle. These included the use of [3H]inositol to label the inositol metabolites, all of which are confined to this cycle, and of Li+ to decrease the rate of degradation of the inositol phosphates. Water-soluble inositol phosphates and chloroform-soluble inositol phospholipids could then be separated by solvent partition and the inositol phosphates further separated by use of an anion-exchange resin. However, the subsequent application of high-performance liquid chromatography as a separation technique indicated the existence of many isomers of the inositol phosphates formed by different pathways of dephosphorylation and phosphorylation. Mapping of these metabolic pathways may be substantially complete, but novel pathways may still be discovered. We review both old and new methods of analysis of the inositol phosphates for the measurement of mass and radioactivity. Although the complexity of the cycle sometimes demands the use of sophisticated methods of separation and rigorous identification, older and inexpensive methods may still be useful for some purposes.
Collapse
Affiliation(s)
- N M Dean
- Cancer Research Center of Hawaii, University of Hawaii, Honolulu 96813
| | | |
Collapse
|
43
|
Lee CH, Dixon JF, Hokin LE. The partial chemical synthesis of inositol 1,2-cyclic 4,5-trisphosphate. Anal Biochem 1989; 183:26-30. [PMID: 2619046 DOI: 10.1016/0003-2697(89)90166-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Appreciable amounts of inositol 1,2-cyclic 4,5-trisphosphate (cIP3) are formed on agonist stimulation of secretory cells, e.g., pancreas (1,2) and parotid (3,4). However, the physiological role of this compound is unknown. To obtain sufficient amounts of cIP3, we have developed a synthetic method to produce cIP3 from inositol 1,4,5-trisphosphate (I(1,4,5)P3). The method is an adaptation of the dicyclohexylcarbodiimide (DCCD) method of Khorana et al. (5), which was originally developed to synthesize 2',3'-cyclic ribonucleotides. The method involves treatment of the pyridinium salt of I(1,4,5)P3 with DCCD in pyridine water, which cyclizes part of the 1-phosphate on the inositol ring to the 1,2-cyclic phosphate. The compound identified as cIP3 cochromatographed with authentic cIP3 in two HPLC systems and on ionophoresis. It was converted to I(1,4,5)P3 on mild acid treatment--a characteristic of cyclic inositol phosphates. Inositol 1,2-cyclic 4,5-trisphosphate is then purified by HPLC. Sufficient amounts of cIP3 can be prepared by this method to carry out numerous experiments on its possible cellular role.
Collapse
Affiliation(s)
- C H Lee
- Department of Pharmacology, University of Wisconsin Medical School, Madison 53706
| | | | | |
Collapse
|
44
|
The regulation of the phosphorylation of inositol 1,3,4-trisphosphate in cell-free preparations and its relevance to the formation of inositol 1,3,4,6-tetrakisphosphate in agonist-stimulated rat parotid acinar cells. J Biol Chem 1989. [DOI: 10.1016/s0021-9258(19)47191-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
|
45
|
Kim JW, Ryu SH, Rhee SG. Cyclic and noncyclic inositol phosphates are formed at different ratios by phospholipase C isozymes. Biochem Biophys Res Commun 1989; 163:177-82. [PMID: 2549988 DOI: 10.1016/0006-291x(89)92117-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The cyclic inositol phosphate content in the product of PLC-beta, gamma, and delta mediated cleavage of three phosphoinositides, PtdIns, PtdIns(4)p, and PtdIns(4,5)P2, was measured under several different experimental conditions. The ratio of cyclic to noncyclic product generally decreased in the order PLC-beta greater than PLC-delta greater than PLC-gamma. For all three enzymes the ratio decreased in the order PtdIns greater than PtdIns(4)P greater than PtdIns(4,5)P2. For all combinations of the three enzymes and three substrates cyclic product content was always higher at pH 5.5 than at pH 7.0. The effect of Ca2+ on the ratio of cyclic to noncyclic was also measured. The ratio remained constant between 0.5 microM and 2 mM for PtdIns. For PtdIns(4)P and PtdIns(4,5)P2, the ratios were unchanged between 0.5 and 500 microM, but increased abruptly at millimolar Ca2+ concentrations.
Collapse
Affiliation(s)
- J W Kim
- Laboratory of Biochemistry, National Heart, Lung, and Blood Institutes, Bethesda, Maryland 20892
| | | | | |
Collapse
|
46
|
Dixon JF, Hokin LE. Kinetic analysis of the formation of inositol 1:2-cyclic phosphate in carbachol-stimulated pancreatic minilobules. J Biol Chem 1989. [DOI: 10.1016/s0021-9258(18)80124-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
|
47
|
Sulpice JC, Gascard P, Journet E, Rendu F, Renard D, Poggioli J, Giraud F. The separation of [32P]inositol phosphates by ion-pair chromatography: optimization of the method and biological applications. Anal Biochem 1989; 179:90-7. [PMID: 2757204 DOI: 10.1016/0003-2697(89)90206-6] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We have developed an ion-pair reverse-phase HPLC method to measure inositol phosphates in 32P-labeled cells. The different chromatographic parameters were analyzed to optimize the resolution of the 32P-labeled metabolites. Analysis of inositol phosphates in biological samples was improved by a single charcoal pretreatment which eliminated interfering nucleotides without removing inositol phosphates. The kinetics of production of inositol phosphates in calcium-activated erythrocytes, vasopressin-stimulated hepatocytes, and thrombin-activated platelets were analyzed. Original data on the activation of phosphoinositide phospholipase C were obtained in intact erythrocytes by direct measurement of inositol (1,4,5)P3. Data from agonist-stimulated hepatocytes and platelets were consistent with those from previous studies. In conclusion, this technique offers many advantages over the methodologies currently employed involving anion-exchange chromatography and [3H]inositol labeling: (i) 32P labeling is less expensive and more efficient than 3H labeling and can be used with all types of cells without permeabilization treatments and (ii) ion-pair HPLC gives good resolution of inositol phosphates from nucleotides with shorter retention times, and long reequilibration periods are not required.
Collapse
Affiliation(s)
- J C Sulpice
- Physiologie de la Nutrition, CNRS UA 646, Orsay, France
| | | | | | | | | | | | | |
Collapse
|
48
|
Identification and Isolation of a 75-kDa Inositol Polyphosphate-5-phosphatase from Human Platelets. J Biol Chem 1989. [DOI: 10.1016/s0021-9258(18)81874-9] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
|
49
|
King WG, Rittenhouse SE. Inhibition of Protein Kinase C by Staurosporine Promotes Elevated Accumulations of Inositol Trisphosphates and Tetrakisphosphate in Human Platelets Exposed to Thrombin. J Biol Chem 1989. [DOI: 10.1016/s0021-9258(18)83314-2] [Citation(s) in RCA: 81] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
50
|
Thastrup O, Dawson AP, Scharff O, Foder B, Cullen PJ, Drøbak BK, Bjerrum PJ, Christensen SB, Hanley MR. Thapsigargin, a novel molecular probe for studying intracellular calcium release and storage. AGENTS AND ACTIONS 1989; 27:17-23. [PMID: 2787587 DOI: 10.1007/bf02222186] [Citation(s) in RCA: 416] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- O Thastrup
- Department of Clinical Chemistry, University Hospital, Copenhagen, Denmark
| | | | | | | | | | | | | | | | | |
Collapse
|