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McCarthy MK, Weinberg JB. Eicosanoids and respiratory viral infection: coordinators of inflammation and potential therapeutic targets. Mediators Inflamm 2012; 2012:236345. [PMID: 22665949 PMCID: PMC3362132 DOI: 10.1155/2012/236345] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Accepted: 03/12/2012] [Indexed: 12/20/2022] Open
Abstract
Viruses are frequent causes of respiratory infection, and viral respiratory infections are significant causes of hospitalization, morbidity, and sometimes mortality in a variety of patient populations. Lung inflammation induced by infection with common respiratory pathogens such as influenza and respiratory syncytial virus is accompanied by increased lung production of prostaglandins and leukotrienes, lipid mediators with a wide range of effects on host immune function. Deficiency or pharmacologic inhibition of prostaglandin and leukotriene production often results in a dampened inflammatory response to acute infection with a respiratory virus. These mediators may, therefore, serve as appealing therapeutic targets for disease caused by respiratory viral infection.
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Affiliation(s)
- Mary K. McCarthy
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Jason B. Weinberg
- Department of Microbiology and Immunology, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Pediatrics and Communicable Diseases, University of Michigan, Ann Arbor, MI 48109, USA
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2
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Pruimboom WM, van Dijk AP, Tak CJ, Bonta IL, Wilson JH, Zijlstra FJ. Production of inflammatory mediators by human macrophages obtained from ascites. Prostaglandins Leukot Essent Fatty Acids 1994; 50:183-92. [PMID: 8022853 DOI: 10.1016/0952-3278(94)90143-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Ascites is a readily available source of human macrophages (M phi), which can be used to study M phi functions in vitro. We characterized the mediators of inflammation produced by human peritoneal M phi (hp-M phi) obtained from patients with portal hypertension and ascites. The production of the cytokines interleukin-1 beta (IL-1 beta), interleukin-6 (IL-6) and tumor necrosis factor-alpha (TNF-alpha) was found to be lipopolysaccharide (LPS) concentration dependent (0-10 micrograms/ml) with a maximal production at 10 micrograms/ml and also dependent on the time of exposure to the stimulus (0-36 h). IL-1 beta, IL-6 and TNF-alpha production after LPS administration reached a plateau at 24 h. In vitro stimulation for 24 h with LPS does not influence the eicosanoid production from endogenous arachidonate. 13 min of exposure of the cells to the calcium ionophore A23187 gives a significant increase in eicosanoid production from both exogenous and endogenous arachidonate. The main eicosanoids produced are the 5-lipoxgenase products LTB4 and 5-hydroxyeicosatetraenoic acid (HETE). The increase in production of the other eicosanoids is not significant. The eicosanoid production depends on the stimulus concentration. The optimal A23187 concentration is 1 microM. Oxygen radical production was measured in the M phi by a flowcytometric method. The fluorescence intensity of phorbol 12-myristate 13-acetate stimulated and dihydro-rhodamine 123 loaded hp-M phi increases significantly after 15 min. We conclude that LPS stimulation of hp-M phi from liver disease results in similar production of IL-1 beta, IL-6 and TNF-alpha, but that the profile of the eicosanoid production of these M phi stimulated with LPS and A23187 differs from M phi of other origin and species.
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Affiliation(s)
- W M Pruimboom
- Department of Internal Medicine II, University Hospital Dijkzigt Rotterdam, The Netherlands
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3
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Suzuki M, Li J, Asakura T, Arai K. Opposing effects of indomethacin and nordihydroguaiaretic acid on macrophage function and tumor growth. Jpn J Cancer Res 1994; 85:306-14. [PMID: 8188530 PMCID: PMC5919455 DOI: 10.1111/j.1349-7006.1994.tb02098.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
The effects of indomethacin (INDO) and nordihydroguaiaretic acid (NDGA) were compared on macrophage function and tumor growth. Intraperitoneal injections (5 mg/kg/day, 6, 8 or 9 days) of INDO in C57BL/6 mice stimulated the cytotoxicity of peritoneal macrophages and inhibited growth of subcutaneous B16 melanoma, whereas NDGA injections suppressed macrophage cytotoxicity, increased macrophage prostaglandin-E2 (PGE2) release, and enhanced the tumor growth. Further, pretreatment of macrophages in vitro with the INDO group serum increased cytostasis against B16 tumor cells, while the use of NDGA group serum reduced it. Incubation of tumor-bearer's macrophages in vitro with INDO (10(-6) M and 10(-7) M) or 10(-6) M NDGA for 4 h reduced PGE2 release, but 10(-7) M NDGA markedly enhanced the PGE2 release. Our data indicate that INDO and NDGA are able to modulate the macrophage function directly, and produce opposing effects on macrophage function and tumor growth. Inhibitory actions of INDO and NDGA on the cyclooxygenase or lipoxygenase pathway of arachidonic acid metabolism appear to contribute to their effects.
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Affiliation(s)
- M Suzuki
- Department of Surgery, Graduate Hospital, Philadelphia, Pennsylvania
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4
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Role of Acetylsalicylic Acid in Cytokine Stimulation of Macrophages in Antibody-Dependent Cellular Cytotoxicity (ADCC). Mediators Inflamm 1994; 3:419-24. [PMID: 18475590 PMCID: PMC2365582 DOI: 10.1155/s0962935194000591] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
In addition to the spectrum of biological action already known to be
exhibited by acetylsalicylic acid (ASA) as an analgesic,
anti-inflammatory and platelet aggregation inhibitor, there is
growing evidence of a stimulatory effect on the immune system. ASA
has been found to increase the production ofcytokines and to
increase the activity of various leukocytes. The action of ASA on
the activity of mouse peritoneal macrophages was therefore
investigated in the present study. Therapeutically effective
concentrations of ASA, which are known to decrease levels of
prostaglandins, had neither a stimulating nor an inhibiting
influence on antibody-dependent cellular cytotoxicity (ADCC) or on
the binding capacity of macrophages with regard to SW 948 tumour
cells. Likewise ASA had little or no adverse effect on the capacity
of the macrophages for stimulation by interferon-gamma (IFN-gamma)
and interleukin-4 (IL-4). Taken together, the immunostimulant effect
of ASA shown in the literature as an increased production of
interleukin-2 (IL-2) and IFN, could not be confirmed on the basis of
the macrophage cytotoxiclty.
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5
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Uhlenbruck G, Lötzerich H, Bernhardt J, Rogalla K. Acetylsalicylic acid has no effects on various isolated immune cells in vitro. EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY AND OCCUPATIONAL PHYSIOLOGY 1993; 66:473-6. [PMID: 8354243 DOI: 10.1007/bf00634294] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
In addition to the well known biological effects of acetylsalicylic acid (ASA), its stimulating effect on the immune system has recently been described. In the present study, therefore, the influence of ASA on isolated leucocytes was investigated in vitro. Various concentrations of ASA, representing therapeutic concentrations, had neither an inhibitory nor a stimulating influence on the cytotoxicity of CD16-positive cells. The phytohaemagglutinin-induced proliferation of lymphocytes and the phagocytosis activity of monocytes and neutrophilic granulocytes was similarly unaffected. These results would indicate that the immunostimulating effects already described for ASA cannot be examined in isolated leucocytes in vitro and should be attributed to an interaction of various effector cells in vivo.
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Affiliation(s)
- G Uhlenbruck
- Institut für Immunbiologie, Universität Köln, Cologne, Germany
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6
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Elliott GR, Van de Meent D, Van Dijk J. Interleukin-1 alpha-stimulated fibroblast eicosanoid synthesis is not mediated by interleukin-6. Eur J Pharmacol 1992; 214:253-9. [PMID: 1516641 DOI: 10.1016/0014-2999(92)90126-o] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Adherent human dermal fibroblasts secreted interleukin-6, prostaglandin E2, prostaglandin I2 and 15-hydroxyeicosatetraenoic acid (assayed by radioimmunoassay) during a 3 h incubation period. Although human dermal fibroblasts did not secrete interleukin-1 alpha or interleukin-1 beta, human recombinant interleukin-1 alpha stimulated arachidonic acid metabolism and interleukin-6 synthesis. This effect was, at least partly, dependent on de novo protein synthesis. In contrast, human recombinant interleukin-6 had no effect on the synthesis and release of the eicosanoids measured. Human recombinant interleukin-1 alpha also stimulated the metabolism of [14C]arachidonic acid, but only if fibroblast were pre-incubated with the cytokine for three hours. Our data indicate that (a) fibroblasts secrete interleukin-6 but not interleukin-1, (b) interleukin-1 alpha, but not interleukin-6, stimulates fibroblast arachidonic acid metabolism and (c) the mechanisms involved in the metabolism of endogenous arachidonic acid are more sensitive to human recombinant interleukin-1 alpha than those involved in metabolism of the exogenous substrate.
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Affiliation(s)
- G R Elliott
- Department of Pharmacology, Medical Biological Laboratory, T.N.O., Rijswijk, Netherlands
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7
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Non-steroidal anti-inflammatory drugs and the augmented lipoxygenase pathway: conceivable impact on joint conditions. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/978-94-011-2982-4_32] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
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8
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Schenkelaars EJ, Singh HN, Goldberg RL, Doughty JR, Peppard J, DiPasquale G, Quagliata F. Pharmacological modulation of rat monocytes: in vivo effects on Ia expression and interleukin-1 production. AGENTS AND ACTIONS 1991; 34:66-9. [PMID: 1793054 DOI: 10.1007/bf01993240] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We have shown that during the developing phase of adjuvant disease (AD) in rats the expression of MHC class II (Ia) antigens on blood monocytes (BM) was enhanced. The results of a study in established AD are reported now. Four agents were tested: indomethacin and diclofenac-sodium (1 mg/kg/day); levamisole and prinomide (10 mg/kg/day), administered orally from day 18-31 after induction of AD. We assessed the following BM parameters: Ia expression, interleukin-1 (sIL-1) production, and membrane bound IL-1 (mIL-1). In AD Ia expression was enhanced, no changes occurred in mIL-1 or sIL-1. Indomethacin treatment reduced sIL-1 production, levamisole Ia expression and mIL-1 activity, prinomide all three parameters measured and diclofenac, though clinically effective, none.
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Affiliation(s)
- E J Schenkelaars
- CIBA-GEIGY Corporation, Pharmaceuticals Division, Summit, NJ 07901
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9
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Elliott GR, Lauwen AP, Bonta IL. Acute administration of carnitine to rats modified the basal and A23187-stimulated release of eicosanoids from 4 day carrageenin-elicited peritoneal macrophages. AGENTS AND ACTIONS 1991; 32:88-9. [PMID: 1647652 DOI: 10.1007/bf01983322] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- G R Elliott
- Pharmacology Department, Medical Biological Laboratory, TNO, The Netherlands
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Elliott GR, Lauwen AP, Bonta IL. Leukotriene B4 stimulation of macrophage cyclooxygenase metabolite synthesis. AGENTS AND ACTIONS 1991; 32:73-4. [PMID: 1647649 DOI: 10.1007/bf01983316] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- G R Elliott
- Pharmacology Dept., M.B.L., Rijswijk, The Netherlands
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11
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Elliott GR, Lauwen AP, Bonta IL. The effect of acute feeding of carnitine, acetyl carnitine and propionyl carnitine on basal and A23187-stimulated eicosanoid release from rat carrageenan-elicited peritoneal macrophages. Br J Nutr 1990; 64:497-503. [PMID: 2171633 DOI: 10.1079/bjn19900049] [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: 12/30/2022]
Abstract
Little is known about the ability of carnitine to modulate cell functions. As carnitine plays an important role in lipid metabolism we investigated the acute effect of L-carnitine, L-acetyl carnitine and L-propionyl carnitine (300 mg/kg per d; 4 d) on the basal and calcium-ionophore (A23187)-stimulated release of arachidonic acid metabolites from rat carrageenan-elicited peritoneal macrophages. A decrease in the number of peritoneal carrageenan-elicited macrophages was observed after feeding all three compounds. The basal release of prostaglandin E2, 6 keto-prostaglandin F1 alpha and leukotriene B4 was stimulated by all treatments. In contrast, thromboxane B2 production was diminished by feeding carnitine and acetyl carnitine. A23187-stimulated synthesis of 6 keto-prostaglandin F1 alpha and leukotriene B4 was further enhanced by all three compounds. Acetyl carnitine and propionyl carnitine also enhanced thromboxane B2 synthesis. However, no effects on prostaglandin E2 formation were detected. The 6 keto-prostaglandin F1 alpha:thromboxane B2 ratio, calculated from the basal and A23187-stimulated values, was increased by carnitine treatment. In the presence of A23187 there was also an increase in the 6 keto-prostaglandin F1 alpha:leukotriene B4 ratio. We conclude that carnitine, and possibly some of its derivatives, could modify the macrophage component of an inflammation in vivo.
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Affiliation(s)
- G R Elliott
- Pharmacology Department, Erasmus University Rotterdam, The Netherlands
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12
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Bonta IL, Ben-Efraim S. Interactions between inflammatory mediators in expression of antitumor cytostatic activity of macrophages. Immunol Lett 1990; 25:295-301. [PMID: 2123474 DOI: 10.1016/0165-2478(90)90199-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Antitumor properties and participation in inflammatory events are important characteristics of activated macrophages. We show here that both antitumor cytostatic function of macrophages and participation of these cells at inflammatory sites are controlled by two main groups of mediators: cytokines (IL-1, TNF alpha) and eicosanoids (prostanoids and leukotrienes). These two groups of mediators represent a complex system of mutual interactions in regulation of their production and activities. Multiple sets of experiments with murine macrophages are discussed in favor of the views that PGE2 and lipoxygenase products oppose each other's actions, and that the regulating role of PGE2 in the secretions of cytokines are of pivotal importance in antitumor cytostasis of macrophages in vitro. Such observations can be extended to a situation ex vivo, showing that human macrophages harvested from inflammatory sites have markedly augmented cytostatic expression. It thus appears that the antitumor cytostatic function of macrophages is related to the production of inflammatory mediators by these cells. Accordingly, it might be that occurrence of inflammation in tumor-bearing individuals plays a role in the promotion of antitumor activity of macrophages.
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Affiliation(s)
- I L Bonta
- Department of Pharmacology, Faculty of Medicine, Erasmus University, Rotterdam, The Netherlands
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13
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Schenkelaars EJ, Bonta IL, Ferrone S, Quagliata F. Macrophage function during the development of adjuvant disease. AGENTS AND ACTIONS 1990; 29:111-3. [PMID: 2327311 DOI: 10.1007/bf01964735] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Using rat peritoneal macrophages and blood monocytes we examined the relationship of developing adjuvant disease (AD) with the expression of class I and II antigens, release of interleukin-1 (IL-1) and production of prostaglandin E2 (PGE2). We observed that class I and II antigens initially decreased; class II remained low throughout, whereas class I returned to normal. PGE2 and IL-1 gradually increased. Treatment in vivo with the NSAID Na-diclofenac lowered PGE2 and IL-1 release and partly reversed the observed reduction of class I and II antigens. Also, exposure of the cells in vitro to lipopolysaccharide increased class I antigen expression.
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14
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Elliott GR, Lauwen AP, Bonta IL. Prostaglandin E2 inhibits and indomethacin and aspirin enhance, A23187-stimulated leukotriene B4 synthesis by rat peritoneal macrophages. Br J Pharmacol 1989; 96:265-70. [PMID: 2538186 PMCID: PMC1854358 DOI: 10.1111/j.1476-5381.1989.tb11812.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
1. The calcium ionophore, A23187, stimulated leukotriene B4 (LTB4), thromboxane B2 (TxB2) and prostaglandin E2 (PGE2) synthesis by 4 day carrageenin-elicited rat peritoneal macrophages. 2. At concentrations of 2 x 10(-7)-2 x 10(-5) M indomethacin and aspirin enhanced A23187-stimulated LTB4 synthesis and inhibited PGE2 and TXB2 formation. 3. PGE2 inhibited A23187-stimulated LTB4 and TXB2 formation as well as the augmentation of LTB4 release caused by aspirin and indomethacin. However, PGE2 was ineffective when the cells were challenged with arachidonic acid (AA). 4. Dibutyryl adenosine 3':5'-cyclic monophosphate (db-cyclic AMP) partially inhibited A23187-stimulated LTB4 production. 5. Our results suggest that PGE2 inhibits macrophage LTB4 synthesis by limiting the availability of AA. Indomethacin and aspirin, possibly by removing the regulatory effect of PGE2, promote the synthesis of the pro-inflammatory LTB4.
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Affiliation(s)
- G R Elliott
- Department of Pharmacology, Medical Faculty, Erasmus University, Rotterdam, The Netherlands
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Bonta IL, Elliott GR, Tak C, Ben-Efraim S. Indomethacin stimulation of macrophage cytostasis against MOPC-315 tumor cells is enhanced by endogenous metabolites of lipoxygenase and counteracted by prostaglandin E2. AGENTS AND ACTIONS 1989; 26:167-9. [PMID: 2496587 DOI: 10.1007/bf02126596] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- I L Bonta
- Department of Pharmacology, Medical Faculty, Erasmus University, Rotterdam, The Netherlands
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16
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Elliott GR, Schenkelaars EJ, Lauwen AP, Bonta IL. Eicosanoids as modulators of macrophage eicosanoid release. AGENTS AND ACTIONS 1989; 26:163-4. [PMID: 2540637 DOI: 10.1007/bf02126594] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- G R Elliott
- Department of Pharmacology, Erasmus University, Rotterdam, The Netherlands
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Gagnon L, Filion LG, Dubois C, Rola-Pleszczynski M. Leukotrienes and macrophage activation: augmented cytotoxic activity and enhanced interleukin 1, tumor necrosis factor and hydrogen peroxide production. AGENTS AND ACTIONS 1989; 26:141-7. [PMID: 2540636 DOI: 10.1007/bf02126587] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Leukotrienes (LT), and in particular LTB4, are potent inflammatory mediators and immunomodulators. In its interactions with leukocytes, LTB4 can activate numerous functions of neutrophils and modulate the activities of various lymphocyte subsets. LTB4 can also augment macrophage and monocyte cytotoxic activities and enhance their production of hydrogen peroxide and the monokines interleukin 1 and tumor necrosis factor. These observations allow a more detailed understanding of the effects of LTB4 on cellular immune and inflammatory functions.
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Affiliation(s)
- L Gagnon
- Immunology Division, Faculty of Medicine, University of Sherbrooke, QC, Canada
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18
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Van Hilten JA, Elliott GR, Bonta IL. Specific lipoxygenase inhibition reverses macrophage cytotasis towards P815 tumor cells in vitro induced by the calcium ionophore A23187. Prostaglandins Leukot Essent Fatty Acids 1988; 34:187-92. [PMID: 3146755 DOI: 10.1016/0952-3278(88)90144-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A23187-stimulated cytostatic activity of peritoneal macrophages towards P815 tumor cells served as a model for macrophage activation: a macrophage enriched preparation, separated on the basis of cell size in a discontinuous FCS gradient column, expressed cytostatic activity when stimulated by A23187. This was inhibited dose-dependently, by AA-861 but not by nordihydroguaiaretic acid (NDGA). AA-861 inhibited 5-lipoxygenase specifically, NDGA inhibited both 5-lipoxygenase- and cyclooxygenase activity. The ratio cyclooxygenase/lipoxygenase products increased with AA-861 but not with NDGA. These results show that lipoxygenase products are necessary for expression of cytostatic activity of these arachidonic acid metabolite-producing macrophages and that the ratio cyclooxygenase/lipoxygenase metabolites plays an important role in macrophage activation.
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Affiliation(s)
- J A Van Hilten
- Institute of Pharmacology, Faculty of Medicine, Erasmus University Rotterdam, The Netherlands
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Dibutyryl Cytidine and Adenosine 3':5'-Cyclic Monophosphates Inhibit A23187-Stimulated Rat Peritoneal Macrophage Leukotriene B4 Synthesis. Int J Immunopathol Pharmacol 1988. [DOI: 10.1177/039463208800100202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Dibutyryl cytidine and adenosine 3':5'-cyclic monophosphates (db-cCMP and db-cAMP respectively) inhibited the synthesis of thromboxane (TX) B2, the stable product of TXA2, and leukotriene (LT) B4 by 4-day carrageenin-elicited rat peritoneal macrophages stimulated by the calcium ionophore A23187. Incubation of macrophages with dbcAMP, at concentrations inhibiting eicosanoid release, was associated with an increase in intracellular cAMP concentrations. No such increase was seen when db-cCMP was used.
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Bachelet M, Adolfs MJ, Masliah J, Bereziat G, Vargaftig BB, Bonta IL. Interaction between PAF-acether and drugs that stimulate cyclic AMP in guinea-pig alveolar macrophages. Eur J Pharmacol 1988; 149:73-8. [PMID: 2840303 DOI: 10.1016/0014-2999(88)90044-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The PAF-acether (1-alkyl-2-acetyl-sn-glycero-3-phosphocholine)-induced arachidonate release from alveolar macrophages was significantly reduced by prostaglandin E2 (PGE2) and by the beta-adrenoceptor agonist salbutamol. In addition, PAF-acether markedly reduced the increase in intracellular cyclic AMP (cAMP) concentrations induced by PGE2 and salbutamol. Our data indicate an inverse relationship between intracellular cAMP levels and free arachidonate availability in alveolar macrophages treated with PAF-acether. A rise in intracellular cAMP therefore represents an important alternative route for controlling the effects of PAF-acether and the resulting inflammatory alterations in the respiratory system.
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Affiliation(s)
- M Bachelet
- Unité de Pharmacologie Cellulaire, INSERM 285, Paris, France
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Elliott GR, van Batenburg MJ, Bonta IL. Copper modulation of macrophage cyclooxygenase metabolite synthesis. PROSTAGLANDINS 1987; 34:657-67. [PMID: 3124217 DOI: 10.1016/0090-6980(87)90290-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The effect of copper on the release of cyclooxygenase metabolites from starch elicited, rat, peritoneal macrophages was investigated. Copper sulphate, in the range 10(-6)-10(-5) M, inhibited the formation of prostaglandin (PG) E2 and thromboxane (Tx) B2, the stable metabolite of TxA2, in a dose dependent manner but had no effect on the production of 6-keto-PGF1 alpha, the stable product of prostacyclin. At higher concentrations (5 x 10(-5) and 10(-4) M) the synthesis of all three metabolites of arachidonic acid (AA) was stimulated as was the release of radioactivity from macrophages prelabelled with 14C AA. Copper had no effect on the metabolism of exogenous AA however. At 10(-4) M copper also stimulated secretion of the lysosomal enzyme, beta-glucuronidase (GUR). Copper nitrate (10(-4) M), but not zinc sulphate, also stimulated eicosanoid formation and lysosomal enzyme release. Our results are consistent with the idea that copper stimulates eicosanoid formation via an effect on PL activity.
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Affiliation(s)
- G R Elliott
- Pharmacology Dept., Medical Faculty, Erasmus University, Rotterdam, The Netherlands
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Elliott GR, van Batenburg MJ, Dzoljic MR. Enhanced prostaglandin E2 and thromboxane B2 release from resident peritoneal macrophages isolated from morphine-dependent rats. FEBS Lett 1987; 217:6-10. [PMID: 3036576 DOI: 10.1016/0014-5793(87)81231-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Resident peritoneal macrophages from morphine-addicted rats (4 days) released more prostaglandin (PG) E2 and thromboxane (Tx) B2, but not 6-keto-PGF1 alpha, than cells from control animals. This effect, which was due to an enhancement of endogenous AA turnover, was not related to any changes in cAMP synthesis or lysosomal enzyme secretion. [D-Ala2]-Met-enkephalin had no effect on eicosanoid release in vitro. Both morphine and PGE2 have been shown to depress macrophage functions. We suggest that morphine-stimulated macrophage PGE2 synthesis, and the consequent inhibition of phagocytosis, could contribute to the decreased resistance to infections associated with opiate addiction.
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