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Original Article |
Receptor III–Mediated Systemic Anaphylaxis but Not for the Arthus Reaction
tostakai{at}idac.tohoku.ac.jp
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RI) on mast cells. Involvement of Lyn in the IgE-mediated immediate-type hypersensitivity is well documented, but the physiological significance of Lyn in IgG-dependent, type III low-affinity FcR for IgG (Fc
RIII)-mediated responses is largely unknown. In this study, we generated a double-mutant mouse strain deficient in both type II FcR for IgG (FcRIIB) and Lyn to exclude any involvement of inhibitory signaling by FcRIIB, which otherwise downregulates FcRIII-mediated cellular responses. FcRIIB-deficient but Lyn-sufficient mice served as controls. The Lyn deficiency attenuated IgG-mediated systemic anaphylaxis in vivo, and significantly reduced calcium mobilization and degranulation responses of bone marrow–derived mast cells (BMMCs) in vitro. However, we found that either interleukin 4 or tumor necrosis factor 
release by BMMCs was comparable to that from Lyn-deficient and control mice, and the reverse-passive Arthus reaction was equally induced in both mutant mice, indicating that Lyn is not involved in the onset of the IgG-mediated, FcRIII-dependent late phase responses of mast cells. These findings provide us with insight into distinct signaling mechanisms in mast cells underlying the development of diverse pathologies as well as a therapeutic potential for selective treatment of allergic disorders.
Key Words: Lyn • Fc receptor • hypersensitivity • mast cells • Arthus reaction
As notable findings in association with our current study, previous studies have defined the central role of low-affinity stimulatory FcR for IgG, Fc
Lyn is a Src family tyrosine kinase which functions to initiate intracellular signal transduction by associating with a variety of immune receptors bearing the cytoplasmic amino acid motif termed immunoreceptor tyrosine–based activation motif (ITAM), which serves as the binding sequence recognized by the Src homology 2 domain of cytoplasmic tyrosine kinase 2122. A recent study using Lyn-deficient mice demonstrated the essential role of Lyn in normal functions of B cells and mast cells in vivo 232425. In fact, Lyn-deficient mice displayed markedly impaired anaphylactic response to IgE plus antigen challenge in skin, suggesting a critical role of Lyn in Fc
In this study, we examined whether Lyn-deficient mice could display the intact function of Fc
Cells and Antibodies.
Induction of Passive Systemic Anaphylaxis.
Measurements of Degranulation and Cytokine Release.
Analysis of Cytoplasmic Calcium Mobilization.
Immunoblot Analyses.
Flow Cytometric Analysis.
Histologic and Cytologic Examinations.
Reverse Cutaneous Arthus Reaction.
Introduction
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Abstract
Introduction
Materials and Methods
Results
Discussion
References
Fc receptors (FcRs) expressed on immune effector cells are capable of initiating a variety of immune and inflammatory responses in an antibody-dependent manner. Because of the complexity stemming from overlapped FcR expression on diverse cell types, the defined role of each class of FcR had not been assigned until recent efforts to generate several strains of mice genetically deficient in FcR expression. Currently, their roles are implicated not only in host defense but also in the development of such diverse diseases as allergy 12, Arthus reaction 34, rheumatoid arthritis 56, immune glomerulonephritis 78, autoimmune vasculitis 9, systemic lupus erythematosus 10, and Goodpasture's syndrome 11. The findings obtained from these mutant mice have promoted an understanding of the indispensable role of each FcR in a variety of immune processes (for reviews, see references 121314). RIII, on mast cells in initiating two distinct classes of immune responses, that is, the IgG-dependent anaphylaxis 151617 and the reverse-passive Arthus reaction 34181920. These in vivo experimental models of inflammation are mutually distinguishable by the time of disease onset and their histological features. Anaphylaxis displays edematous lesions in skin or systemic insufficiency of blood supply (shock) immediately after antigen challenge, whereas the Arthus reaction appears as bleeding and tissue-damaged lesions and takes several hours for their development after antigen challenge. To date, pathogenesis of these distinctive models has been interpreted as a consequence of time-constrained releases of proinflammatory mediators, for example, prestored factors such as histamine and serotonin, or de novo synthesized factors such as arachidonic acid metabolites and cytokines. However, an intracellular mechanism underlying the pathogenesis of these models remains unclear. RI-mediated signal transduction 26. RIII, which associates with FcRβ and FcR, the same ITAM-bearing subunits as FcRI, and which serves as the main initiator of IgG-mediated immune responses in mice (for a review, see reference 12). To achieve this objective, we first prepared double-homozygous mice bearing null mutations for Lyn 24 and FcRIIB 27. Since FcRIIB affects FcRIII-mediated signaling by its inhibitory nature when these two FcRs are present on a cell, as in the case of mast cells 1727, the removal of FcRIIB makes it possible to assess the net effect of FcRIII-mediated stimulation on the onset of diseases. Using these double-mutant mice, we obtained results that demonstrated the dispensable role of Lyn in cytokine production in mast cells and in the onset of reverse-passive Arthus reaction in contrast to its indispensable role in IgG-mediated anaphylactic response. Current findings provide an insight into distinct signaling mechanisms in mast cells underlying the development of diverse pathologies and suggest a way for selective treatment of hypersensitivities.
Materials and Methods
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Abstract
Introduction
Materials and Methods
Results
Discussion
References
Mice.
All experiments were performed using 7–12-wk-old mice housed under conditions monthly certified as being specific-pathogen free. The mice homozygous of null mutations in both Lyn and FcRIIB (Lyn–IIB–) were generated by serial crossbreeding between Lyn–/– 24 and FcRIIB–/– 27 strains of mice. Their littermates of Lyn+/–FcRIIB–/– (IIB–) were used as control mice.
Bone marrow–derived mast cells (BMMCs) were obtained from a culture of bone marrow cells in RPMI 1640 supplemented with 5 ng/ml murine IL-3 (R&D Systems), 10% FCS, nonessential amino acids (GIBCO BRL), 100 IU/ml penicillin, 100 µg/ml streptomycin, and 10 µM 2-ME. To obtain the different type of cultured mast cells, BMMCs were further cultured on confluent monolayer of Swiss 3T3 fibroblasts (American Type Culture Collection) in the same medium for 2 wk. We used the BMMCs tightly adhered to monolayer cells (3T3-BMMCs) for our assays. Peritoneal resident mast cells (PMCs) were collected by peritoneal washings with Tyrode's solution supplemented with heparin (5 U/ml). Positive cells for mouse c-kit staining were analyzed as PMCs. Mouse anti-trinitrophenyl hapten (TNP) IgE (IGELa2; American Type Culture Collection) and mouse anti-TNP IgG1 (G1; reference 28) were prepared with DEAE-cellulose column chromatography from hybridoma culture supernatants. Rat anti–mouse FcRII/III (2.4G2; BD PharMingen), anti–mouse c-kit (2B8; BD PharMingen), rabbit IgG anti-OVA (Sigma-Aldrich), F(ab')2 fragment of goat anti–rat IgG (Immunotech), and mouse antiphosphotyrosine antibody (4G10; Upstate Biotechnology) were purchased.
Each mouse was sensitized by intravenous administration of 200 µg anti-TNP IgG or 20 µg anti-TNP IgE. At 30 min (IgG sensitization) or 24 h (IgE sensitization) after the sensitization, anaphylaxis was induced by intravenous administration of 1 mg TNP-conjugated OVA (Sigma-Aldrich) in 100 µl PBS per mouse. Control mice received PBS in place of antibody for sensitization. Rectal temperature was monitored at various time points after induction using a rectal probe coupled to a digital thermometer (Natsume Seisakusyo Co.).
BMMCs (5 x 105/ml) were labeled with 6.6 µCi/ml of 5-[1,2-3H]-hydroxytryptamine creatinine sulfate (American Radiolabeled Chemicals, Inc.) for 16 h, and sensitized with 5 µg/ml 2.4G2 or 1 µg/ml of mouse anti-TNP IgE for 30 min of the labeling period. After unbound antibodies were washed out, the receptor of interest was aggregated with 0.3–10 µg/ml F(ab')2 fragment of goat anti–rat IgG or 0.03–30 ng/ml TNP-OVA for 1 h. The percentage of serotonin release (percent degranulation) was calculated as described previously. For cytokine measurements, BMMCs (5 x 104 per sample) and 3T3-BMMCs (105 per sample) without the labeling process were stimulated as described above, and culture supernatant was harvested at 3–12 h after induction for TNF- or IL-4 measurement, respectively. The amount of released cytokine was measured by ELISA kit (BD PharMingen). Tissue extract samples were prepared from punched-out skin specimens (12.5 mm2) at 3 h after induction of reverse-passive Arthus reaction. Tissue specimens were homogenized in 400 µl PBS containing 2 mM EDTA, 1 mM PMSF, 10 µg/ml aprotinin, 5 µg/ml leupeptin, and 2 µg/ml pepstatin. The amount of TNF- in supernatant was measured with ELISA.
BMMCs labeled with 2 µM Fura-2/acetoxymethyl ester (Molecular Probes) were sensitized with 2 µg/ml biotinylated mouse anti-TNP IgE or 5 µg/ml biotinylated 2.4G2 for 10 min at 25°C. Free antibody was washed out, after which the cells were stimulated with 10 µg of streptavidin (Wako Pure Chemicals) in 2 ml PBS containing 1 mM CaCl2 and 1 mM MgCl2. Cytoplasmic calcium mobilization was monitored at a 510-nm emission wavelength excited by 340 and 360 nm with a fluorescence spectrophotometer (model F4500; Hitachi Ltd.). Calibration and calculation of calcium concentration were performed as described 29.
BMMCs (106) sensitized with 2.4G2 or biotinylated mouse IgE were treated with 30 µg/ml F(ab')2 fragment of goat anti–rat IgG or 5 µg/ml streptavidin for 0.5, 1, and 5 min at 37°C in 100 µl PBS supplemented with 1 mM CaCl2 and 1 mM MgCl2. The treatment was terminated by adding an equal volume of ice-chilled lysis buffer (50 mM Tris-HCl, pH 7.4, 1% NP-40, 137 mM NaCl, 2 mM EDTA, 50 mM NaF, 2 mM NaVO4, 1 mM PMSF, 10 µg/ml aprotinin, 5 µg/ml leupeptin, 2 µg/ml pepstatin). The cell extract cleared of nuclear fraction was used for the detection of protein phosphorylation. Immunoblotting was performed with antiphosphotyrosine monoclonal antibody (4G10).
Expression level of FcRI and FcRIII on mast cells was measured by staining with mouse IgE plus FITC-conjugated anti–mouse IgE and R-phycoerythrin (R-PE)–conjugated anti–mouse FcRII/III (2.4G2), respectively. Background levels of FcRI and FcRIII stainings for the cultured mast cells were shown by single staining of FITC–anti-IgE and R-PE–conjugated rat IgG2b isotype control antibody, respectively. In the case of PMCs, we used the PMC from FcRIIB-FcR double deficient mice, in which cell surface expression of FcRI and FcRIII is diminished, as a negative control to determine the level of background signal. Increased expression of FcRI on BMMCs was observed after the culture for 24 h in the presence of 1 µg/ml of IgE. Flow cytometric analyses were performed with a FACSCaliburTM (Becton Dickinson), and c-kit–positive cells in 3T3-BMMCs and PMCs were analyzed as mast cells.
Paraffin-embedded skin sections were prepared after fixation in 10% (vol/vol) neutral-buffered formalin. Peritoneal cells were placed onto slide glass plate by cytospin centrifugation and fixed as above. Specimens were stained with toluidine blue dye, pH 2.5, or hematoxylin and eosin.
Mice intradermally received 20 µl of saline containing 0, 16, and 80 µg of rabbit anti-OVA in a discrete spot on the shaved back of the trunk, and immediately thereafter received 200 µl of saline containing 1 mg of OVA intravenously. Mice were killed at 8 h, and the dorsal skins were harvested. Myeloperoxidase (MPO) assay was performed as described by Bradley et al. 30. In brief, the punched-out area (12.5 mm2) of lesion of interest was homogenized in 400 µl of 50 mM phosphate buffer, pH 6.0, and further extracted by adding hexadecyltrimethylammonium bromide (HTAB; Sigma-Aldrich) to 0.5%, followed by sonication for 20 s and three cycles of freezing and thawing. The supernatant of extract obtained by centrifugation at 14,000 rpm for 15 min was used for measurement of MPO activity. 20 µl of the supernatant was mixed with 200 µl of 50 mM phosphate buffer, pH 6.0, containing 0.167 mg/ml o-dianisidine dihydrochloride (Sigma-Aldrich) and 0.0005% hydrogen peroxide (Wako Pure Chemicals), and color change was measured with light absorbance at 460 nm. 1 U of MPO activity was arbitrarily defined as the activity given by 0.25 µl of mouse whole blood.
Results
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Abstract
Introduction
Materials and Methods
Results
Discussion
References
Impaired FcRIII Function for Passive Systemic Anaphylaxis Induction in Lyn-deficient Mice.
Previous studies have shown that Lyn-deficient mice failed to display IgE-dependent passive cutaneous anaphylaxis, suggesting a critical role of Lyn in triggering the signal downstream of FcRI on mast cells 23. We further examined the role of Lyn in triggering the signal downstream of FcRIII by inducing passive systemic anaphylaxis with IgG immune complexes. In all experiments in this report, we used a double-mutant mouse strain of Lyn and FcRIIB (Lyn–IIB–) to eliminate involvement of FcRIIB, which exerts an inhibitory function on FcRIII-mediated responses 131727. We induced systemic anaphylaxis in Lyn-deficient and control mice by challenging with hapten-specific antibody (anti-TNP IgG or anti-TNP IgE) and antigen (TNP-OVA) through the tail vein. Decrease in rectal temperature was monitored as a measure of systemic anaphylactic response. Both in IgG- and IgE-based stimulations, Lyn-deficient mice displayed markedly reduced responses, whereas the control mice showed substantial responses (Fig. 1). The finding of impaired responsiveness in Lyn-deficient mice indicates that activation of Lyn in mast cells is necessary for intact anaphylactic response triggered by FcRIII as well as by FcRI.
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RIII Functions Detectable in BMMCs from Lyn-deficient Mice.RIII or FcRI, and measured radiolabeled serotonin released into the culture medium (Fig. 2). Upon either FcRIII- or FcRI-mediated stimulation, degranulation responses of Lyn-deficient BMMCs were significantly low within the range of low grade stimulation, that is, 1–3 µg/ml for anti–rat IgG or 0.3–3 ng/ml for TNP-OVA, although comparable degranulation was achieved within the range of high grade stimulation in Lyn-deficient BMMCs. These differences between Lyn-deficient and control mice were further confirmed in three experiments using two independently established mast cell cultures. We next examined intracellular defective traits in Lyn-deficient BMMCs by detecting cytoplasmic calcium mobilization and tyrosine phosphorylation of whole cellular proteins (Fig. 3A and Fig. B). We used biotin-conjugated antibodies and streptavidin for BMMC stimulation. This mode of stimulation had been determined to be equivalent to the high grade stimulation for degranulation assay. To either FcRIII- or FcRI-mediated stimulation, the Lyn-deficient BMMCs displayed a reduced calcium mobilization. This response was especially affected in the early phase (<150 s) of induction, but substantially induced in the late phase (>300 s; Fig. 3 A). As long as it was observed at 5 min after stimulation, induction of tyrosine phosphorylation was markedly affected in Lyn-deficient BMMCs (Fig. 3 B).
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RI, and FcRIII (Fig. 4 A). We also observed normal increase of FcRI expression on Lyn-deficient BMMC by monomeric IgE binding (Fig. 4 A). Importantly, resident mast cells in skin and PMCs from Lyn-deficient and control mice were mutually indistinguishable in cell number, cell shape, cell size, and intracellular granule density (Fig. 4 B). These findings indicate the normal development of mast cells in Lyn-deficient mice. Accordingly, we concluded that defective phenotypes in Lyn-deficient mast cells and mice are not because of lowered expression of FcRs and developmental abnormality, and thus Lyn is central to the activation of FcR-mediated signal transduction for the immediate phase of mast cell activation.
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RIII Function for Cytokine Production in BMMCs from Lyn-deficient Mice. and IL-4, well-analyzed cytokines in association with mast cell activation, are known to be released at a few and several hours, respectively, after FcR-mediated stimulation. The cytokine releases of mast cells have been shown to be important for development of mast cell–related tissue injuries 94041 and allergic phenotypes 42. In this respect, we further examined the effect of Lyn depletion on TNF- and IL-4 production as a downstream event of FcR-mediated stimulation. The 3T3-BMMCs and BMMCs were stimulated for several hours in the presence of anti-FcRII/III (2.4G2) and graded amounts of secondary antibody for FcRIII cross-linking. We measured the amount of IL-4 and TNF- in culture medium with ELISA at 12 and 3 h, respectively, after cross-linking. The results clearly demonstrated no defects in TNF- and IL-4 induction in Lyn-deficient 3T3-BMMCs (Fig. 5) as well as in BMMCs (data not shown), indicating that the signaling pathway downstream of FcRIII is linked to cytokine production independently of Lyn activation in mast cells. The paralleled experiments using 3T3-BMMCs and BMMCs with FcRI cross-linking also gave rise to the results indicating no defect in cytokine induction (data not shown). These findings sharply contrast with the attenuated induction of immediate phase responses in Lyn-deficient mice and BMMCs as shown in Fig. 2 and Fig. 3, suggesting the distinctive signaling pathways associated with immediate and late phase responses of mast cells.
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RIII Function for Reverse Cutaneous Arthus Reaction in Lyn-deficient Mice.RIII-mediated mast cell activation 34151619. TNF- is known to play a pivotal role in recruitment of neutrophils in mast cell–dependent cutaneous injury 4344. We examined the onset of reverse-passive Arthus reaction in Lyn-deficient mice after the treatment with intradermal injections of anti-OVA rabbit IgG followed by OVA challenge through the tail vein. Diseased reaction was evaluated by these three means: (a) histopathological feature; (b) MPO activity in situ at the late inflamed phase (8 h), which paralleled the extent of PMN infiltration; and (c) TNF- release at the initial phase (3 h). We first showed that Lyn-deficient mice as well as control mice display inflammatory tissue damage with massive neutrophil infiltration in the challenged sites (Fig. 6 A). Consistently, comparable induction of MPO activity in situ was detected in these two strains of mice (Fig. 6 B). We next examined increase of TNF- production at the initial phase of the Arthus reaction in the challenged sites (dorsal skin and ear). Although the results from two different lesions are somewhat unparallel, there was found to be no statistic significance in the TNF- production between Lyn-deficient and control mice (Fig. 6 C). This finding cannot affirm the intact TNF- production in Lyn-deficient mice; however, it may mean that in vivo mechanisms for TNF- production are not affected as much as mechanisms for the immediate phase reaction in Lyn-deficient mice. Collectively, these findings indicate that activation of the Lyn-independent signaling pathway downstream of FcRIII is sufficient for initiating the reverse-passive Arthus reaction, suggesting that Lyn is not necessary for the onset of late phase responses of mast cells.
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RIIB deficiency made it possible to examine FcRIII function in mast cell activation, whereas Lyn deficiency provided us with an opportunity to reevaluate the nature of signaling mechanisms leading to various types of immune responses in vivo. By introducing both deficiencies in mice, we investigated the nature of FcRIII function in relation to mast cell–dependent pathogenesis. The notable points of the present findings are summarized as follows. (a) Lyn is required for intact induction of immediate phase responses as revealed in the degranulation response and systemic anaphylaxis (Fig. 1Fig. 2Fig. 3). Since Lyn is unlikely to be involved in mechanisms for FcR expression and maturation of mast cell in vivo (Fig. 4), the defect in immediate phase responses in Lyn-deficient mice can be interpreted as a consequence of the defect in signal transduction downstream of FcRs. (b) In contrast, Lyn is dispensable for late phase responses as revealed in cytokine induction and the reverse-passive Arthus reaction (Fig. 5 and Fig. 6). These contrasting results imply that Lyn-dependent and -independent signaling pathways downstream of FcRIII underlie the onset of the anaphylactic response and the Arthus reaction, respectively. Consistent with our present results, two independent studies have demonstrated that Lyn-deficient mice do not display passive cutaneous anaphylaxis triggered by IgE plus antigen 23, while Lyn-deficient BMMCs were capable of activating such cytokine genes as IL-4, IL-5, IL-6, and TNF- in response to FcRI aggregation 26. Thus, it is suggested that FcRIII and FcRI commonly involve Lyn-dependent and -independent modes of signal transduction in triggering immediate and late phase responses of mast cells in vivo, respectively.
It has been well documented that Lyn is physically and functionally associated with cell surface receptors such as B cell receptor 224546, FcRI, FcRIII on mast cells 47, IL-2 receptor 48, and GM-CSF receptor 4950. However, current findings have directed our interest towards molecular mechanisms for a Lyn-independent signaling pathway in mast cells. Previous studies have delineated signaling events required for cytokine gene activation upon FcRI aggregation. In those studies, inactivation of Btk 51, cyclosporin A–sensitive calcium-dependent pathway 52, phosphatidylinositol 3-kinase 5354, protein kinase Cβ 55, or c-Jun NH2-terminal kinase (JNK)-related pathway 5657, respectively, caused attenuation of cytokine gene activation. Accordingly, the Lyn-independent pathway may involve activation of these diverse signaling molecules in mast cells as well as the Lyn-dependent pathway. Notably, the requirement of Btk for cytokine induction suggests the presence of a tyrosine kinase other than Lyn upstream of Btk, because activation of Btk requires another tyrosine kinase such as Lyn to phosphorylate Btk 585960. In fact, Nishizumi and Yamamoto have demonstrated the activation of c-Src kinase on FcRI aggregation in Lyn-deficient mast cells, and suggested a compensatory mechanism for cytokine induction in place of Lyn 26. However, it remains to be determined whether c-Src is functionally sufficient for cytokine induction or not. Here, we again support the presence of an undetermined tyrosine kinase as a mechanism of Lyn-independent signal transduction that sufficiently functions for cytokine induction. The mechanisms for time-constrained mast cell activation, which leads to immediate and late phase responses, may be attributed to the differential natures of Lyn and this putative tyrosine kinase.
There have been two conflicting results reported regarding IgE-dependent anaphylaxis in Lyn-deficient mice. Hibbs and Dunn have shown that Lyn-deficient mice displayed a defect in the induction of passive cutaneous anaphylaxis by IgE 21. On the other hand, Nishizumi and Yamamoto have mentioned that Lyn-deficient mice were capable of developing passive cutaneous anaphylaxis by IgE, and that Lyn-deficient BMMCs indeed displayed no defect in degranulation in response to FcRI aggregation 26. In our current results, Lyn-deficient mice failed to exhibit passive systemic anaphylaxis, whereas Lyn-deficient BMMCs were found to be responsive to high dose stimulation for FcRI. In conclusion, the Lyn-dependent pathway serves as the immediate type of mast cell activation in vivo in response to low dose, probably biologically feasible, FcR-mediated stimulation.
Our findings indicate the presence of a Lyn-independent signaling mechanism in mast cells, and its involvement in cytokine induction and immune complex–triggered immunity represented by the Arthus reaction. As a possible mechanism for Lyn-independent signal transduction, a tyrosine kinase other than Lyn might be postulated for the signaling events. This notion may provide a novel therapeutic approach to allergy, in which targeted blocking of Lyn in mast cells can selectively suppress immediate-type hypersensitivities without affecting a common, immune complex–triggered immunity.
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Acknowledgments |
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This work is supported by research grants from the Ministry of Education, Science, Sports, and Culture of Japan and from the Core Research for Evolutional Science and Technology (CREST) program of Japan Science and Technology Corporation (to T. Takai).
Submitted: 31 May 2000
Revised: 28 December 2000
Accepted: 24 January 2001
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References |
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