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Zec K, Schonfeldova B, Ai Z, Van Grinsven E, Pirgova G, Eames HL, Berthold DL, Attar M, Compeer EB, Arnon TI, Udalova IA. Macrophages in the synovial lining niche initiate neutrophil recruitment and articular inflammation. J Exp Med 2023; 220:e20220595. [PMID: 37115585 PMCID: PMC10148166 DOI: 10.1084/jem.20220595] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 02/08/2023] [Accepted: 04/17/2023] [Indexed: 04/29/2023] Open
Abstract
The first immune-activating changes within joint resident cells that lead to pathogenic leukocyte recruitment during articular inflammation remain largely unknown. In this study, we employ state-of-the-art confocal microscopy and image analysis in a systemic, whole-organ, and quantitative way to present evidence that synovial inflammation begins with the activation of lining macrophages. We show that lining, but not sublining macrophages phagocytose immune complexes containing the model antigen. Using the antigen-induced arthritis (AIA) model, we demonstrate that on recognition of antigen-antibody complexes, lining macrophages undergo significant activation, which is dependent on interferon regulatory factor 5 (IRF5), and produce chemokines, most notably CXCL1. Consequently, at the onset of inflammation, neutrophils are preferentially recruited in the vicinity of antigen-laden macrophages in the synovial lining niche. As inflammation progresses, neutrophils disperse across the whole synovium and form swarms in synovial sublining during resolution. Our study alters the paradigm of lining macrophages as immunosuppressive cells to important instigators of synovial inflammation.
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Affiliation(s)
- Kristina Zec
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, UK
| | | | - Zhichao Ai
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, UK
| | | | - Gabriela Pirgova
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, UK
| | - Hayley L. Eames
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, UK
| | | | - Moustafa Attar
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, UK
| | - Ewoud B. Compeer
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, UK
| | - Tal I. Arnon
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, UK
| | - Irina A. Udalova
- Kennedy Institute of Rheumatology, University of Oxford, Oxford, UK
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2
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Mustonen AM, Capra J, Rilla K, Lehenkari P, Oikari S, Kääriäinen T, Joukainen A, Kröger H, Paakkonen T, Matilainen J, Nieminen P. Characterization of hyaluronan-coated extracellular vesicles in synovial fluid of patients with osteoarthritis and rheumatoid arthritis. BMC Musculoskelet Disord 2021; 22:247. [PMID: 33676459 PMCID: PMC7937210 DOI: 10.1186/s12891-021-04115-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 02/24/2021] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Hyaluronic acid (HA) is the major extracellular matrix glycosaminoglycan with a reduced synovial fluid (SF) concentration in arthropathies. Cell-derived extracellular vesicles (EV) have also been proposed to contribute to pathogenesis in joint diseases. It has recently been shown that human SF contains HA-coated EV (HA-EV), but their concentration and function in joint pathologies remain unknown. METHODS The aim of the present study was to develop an applicable method based on confocal laser scanning microscopy (CLSM) and image analysis for the quantification of EV, HA-particles, and HA-EV in the SF of the human knee joint. Samples were collected during total knee replacement surgery from patients with end-stage rheumatoid arthritis (RA, n = 8) and osteoarthritis (OA, n = 8), or during diagnostic/therapeutic arthroscopy unrelated to OA/RA (control, n = 7). To characterize and quantify EV, HA-particles, and HA-EV, SF was double-stained with plasma membrane and HA probes and visualized by CLSM. Comparisons between the patient groups were performed with the Kruskal-Wallis analysis of variance. RESULTS The size distribution of EV and HA-particles was mostly similar in the study groups. Approximately 66% of EV fluorescence was co-localized with HA verifying that a significant proportion of EV carry HA. The study groups were clearly separated by the discriminant analysis based on the CLSM data. The intensities of EV and HA-particle fluorescences were lower in the RA than in the control and OA groups. CONCLUSIONS CLSM analysis offers a useful tool to assess HA-EV in SF samples. The altered EV and HA intensities in the RA SF could have possible implications for diagnostics and therapy.
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Affiliation(s)
- Anne-Mari Mustonen
- Faculty of Health Sciences, School of Medicine, Institute of Biomedicine, University of Eastern Finland, P.O. Box 1627, FI-70211, Kuopio, Finland. .,Faculty of Science and Forestry, Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 111, FI-80101, Joensuu, Finland.
| | - Janne Capra
- Faculty of Health Sciences, School of Medicine, Institute of Biomedicine, Cell and Tissue Imaging Unit, University of Eastern Finland, P.O. Box 1627, FI-70211, Kuopio, Finland
| | - Kirsi Rilla
- Faculty of Health Sciences, School of Medicine, Institute of Biomedicine, University of Eastern Finland, P.O. Box 1627, FI-70211, Kuopio, Finland
| | - Petri Lehenkari
- Faculty of Medicine, Cancer and Translational Medicine Research Unit, University of Oulu, P.O. Box 5000, FI-90014, Oulu, Finland.,Department of Surgery and Medical Research Center, Oulu University Hospital, P.O. Box 21, FI-90029, Oulu, OYS, Finland
| | - Sanna Oikari
- Faculty of Health Sciences, School of Medicine, Institute of Biomedicine, University of Eastern Finland, P.O. Box 1627, FI-70211, Kuopio, Finland
| | - Tommi Kääriäinen
- Department of Orthopaedics, Traumatology and Hand Surgery, Kuopio University Hospital, P.O. Box 100, FI-70029, Kuopio, KYS, Finland
| | - Antti Joukainen
- Department of Orthopaedics, Traumatology and Hand Surgery, Kuopio University Hospital, P.O. Box 100, FI-70029, Kuopio, KYS, Finland
| | - Heikki Kröger
- Department of Orthopaedics, Traumatology and Hand Surgery, Kuopio University Hospital, P.O. Box 100, FI-70029, Kuopio, KYS, Finland
| | - Tommi Paakkonen
- Faculty of Health Sciences, School of Medicine, Institute of Biomedicine, University of Eastern Finland, P.O. Box 1627, FI-70211, Kuopio, Finland
| | - Johanna Matilainen
- Faculty of Health Sciences, School of Medicine, Institute of Biomedicine, University of Eastern Finland, P.O. Box 1627, FI-70211, Kuopio, Finland
| | - Petteri Nieminen
- Faculty of Health Sciences, School of Medicine, Institute of Biomedicine, University of Eastern Finland, P.O. Box 1627, FI-70211, Kuopio, Finland.,Faculty of Science and Forestry, Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 111, FI-80101, Joensuu, Finland
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3
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Agostinis C, Vidergar R, Belmonte B, Mangogna A, Amadio L, Geri P, Borelli V, Zanconati F, Tedesco F, Confalonieri M, Tripodo C, Kishore U, Bulla R. Complement Protein C1q Binds to Hyaluronic Acid in the Malignant Pleural Mesothelioma Microenvironment and Promotes Tumor Growth. Front Immunol 2017; 8:1559. [PMID: 29209316 PMCID: PMC5701913 DOI: 10.3389/fimmu.2017.01559] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Accepted: 10/31/2017] [Indexed: 01/08/2023] Open
Abstract
C1q is the first recognition subcomponent of the complement classical pathway, which acts toward the clearance of pathogens and apoptotic cells. C1q is also known to modulate a range of functions of immune and non-immune cells, and has been shown to be involved in placental development and sensorial synaptic pruning. We have recently shown that C1q can promote tumor by encouraging their adhesion, migration, and proliferation in addition to angiogenesis and metastasis. In this study, we have examined the role of human C1q in the microenvironment of malignant pleural mesothelioma (MPM), a rare form of cancer commonly associated with exposure to asbestos. We found that C1q was highly expressed in all MPM histotypes, particularly in epithelioid rather than in sarcomatoid histotype. C1q avidly bound high and low molecular weight hyaluronic acid (HA) via its globular domain. C1q bound to HA was able to induce adhesion and proliferation of mesothelioma cells (MES) via enhancement of ERK1/2, SAPK/JNK, and p38 phosphorylation; however, it did not activate the complement cascade. Consistent with the modular organization of the globular domain, we demonstrated that C1q may bind to HA through ghA module, whereas it may interact with human MES through the ghC. In conclusion, C1q highly expressed in MPM binds to HA and enhances the tumor growth promoting cell adhesion and proliferation. These data can help develop novel diagnostic markers and molecular targets for MPM.
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Affiliation(s)
- Chiara Agostinis
- Institute for Maternal and Child Health, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Burlo Garofolo, Trieste, Italy
| | - Romana Vidergar
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Beatrice Belmonte
- Department of Human Pathology, University of Palermo, Palermo, Italy
| | | | - Leonardo Amadio
- Institute for Maternal and Child Health, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Burlo Garofolo, Trieste, Italy
| | - Pietro Geri
- Department of Medical, Surgical and Health Science, University of Trieste, Trieste, Italy
| | - Violetta Borelli
- Department of Life Sciences, University of Trieste, Trieste, Italy
| | - Fabrizio Zanconati
- Department of Medical, Surgical and Health Science, University of Trieste, Trieste, Italy
| | - Francesco Tedesco
- Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Istituto Auxologico Italiano, Milan, Italy
| | - Marco Confalonieri
- Department of Medical, Surgical and Health Science, University of Trieste, Trieste, Italy
| | - Claudio Tripodo
- Department of Human Pathology, University of Palermo, Palermo, Italy
| | - Uday Kishore
- Biosciences, College of Health and Life Sciences, Brunel University London, Uxbridge, United Kingdom
| | - Roberta Bulla
- Department of Life Sciences, University of Trieste, Trieste, Italy
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4
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Mustonen AM, Nieminen P, Joukainen A, Jaroma A, Kääriäinen T, Kröger H, Lázaro-Ibáñez E, Siljander PRM, Kärjä V, Härkönen K, Koistinen A, Rilla K. First in vivo detection and characterization of hyaluronan-coated extracellular vesicles in human synovial fluid. J Orthop Res 2016; 34:1960-1968. [PMID: 26919117 DOI: 10.1002/jor.23212] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Accepted: 02/17/2016] [Indexed: 02/04/2023]
Abstract
Extracellular vesicles (EVs) function in intercellular signaling by transporting different membrane and cytosolic molecules, including hyaluronan (HA) and its synthesis machinery. As both EVs and HA are abundant in synovial fluid, we hypothesized that HA synthesized in synovial membrane would be carried on the surface of EVs. Synovial fluid (n = 15) and membrane samples (n = 5) were obtained from knee surgery patients. HA concentrations were analyzed in synovial fluid and HA and its synthesis machinery were examined with histochemical stainings in synovial membrane. To assess the size distribution of EVs in synovial fluid and to visualize HA on EVs, nanoparticle tracking analysis (NTA), confocal laser scanning microscopy (CLSM) and transmission electron microscopy (TEM) were utilized. The average HA concentration in synovial fluid was 2.0 ± 0.21 mg/ml without significant differences between the patients with trauma/diagnostic arthroscopy and primary or post-traumatic osteoarthritis. Positive stainings of HA synthases (HAS1-3), HA and its receptor CD44 in synovial cells indicated active HA secretion in synovial membrane. According to NTA, EVs were abundant in synovial fluid and their main populations were ≤300 nm in diameter after differential centrifugation. There were no significant differences in the EV counts between the patients with primary or post-traumatic osteoarthritis. TEM verified that HA-positive particles detected by CLSM were lipid membrane vesicles surrounded by a HA coat. Our results provide the first in vivo evidence that human synovial fluid contains HA-positive EVs, one source of which presumably is the long HAS-positive protrusions of synovial fibroblasts. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 34:1960-1968, 2016.
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Affiliation(s)
- Anne-Mari Mustonen
- Faculty of Health Sciences, Institute of Biomedicine/Anatomy, University of Eastern Finland, School of Medicine, P.O. Box 1627, FI-70211 Kuopio, Finland.,Faculty of Science and Forestry, Department of Biology, University of Eastern Finland, P.O. Box 111, FI-80101 Joensuu, Finland
| | - Petteri Nieminen
- Faculty of Health Sciences, Institute of Biomedicine/Anatomy, University of Eastern Finland, School of Medicine, P.O. Box 1627, FI-70211 Kuopio, Finland.,Faculty of Science and Forestry, Department of Biology, University of Eastern Finland, P.O. Box 111, FI-80101 Joensuu, Finland
| | - Antti Joukainen
- Department of Orthopaedics, Traumatology and Hand Surgery, Kuopio University Hospital, P.O. Box 100, FI-70290 Kuopio, Finland
| | - Antti Jaroma
- Department of Orthopaedics, Traumatology and Hand Surgery, Kuopio University Hospital, P.O. Box 100, FI-70290 Kuopio, Finland
| | - Tommi Kääriäinen
- Department of Orthopaedics, Traumatology and Hand Surgery, Kuopio University Hospital, P.O. Box 100, FI-70290 Kuopio, Finland
| | - Heikki Kröger
- Department of Orthopaedics, Traumatology and Hand Surgery, Kuopio University Hospital, P.O. Box 100, FI-70290 Kuopio, Finland
| | - Elisa Lázaro-Ibáñez
- Faculty of Biological and Environmental Sciences, Division of Biochemistry and Biotechnology, Department of Biosciences, University of Helsinki, P.O. Box 56 (Viikinkaari 4), FI-00014 Helsinki, Finland.,Faculty of Pharmacy, Division of Pharmaceutical Biosciences, Centre for Drug Research, University of Helsinki, P.O. Box 56 (Viikinkaari 4), FI-00014 Helsinki, Finland
| | - Pia R-M Siljander
- Faculty of Biological and Environmental Sciences, Division of Biochemistry and Biotechnology, Department of Biosciences, University of Helsinki, P.O. Box 56 (Viikinkaari 4), FI-00014 Helsinki, Finland.,Faculty of Pharmacy, Division of Pharmaceutical Biosciences, Centre for Drug Research, University of Helsinki, P.O. Box 56 (Viikinkaari 4), FI-00014 Helsinki, Finland
| | - Vesa Kärjä
- Department of Pathology, Kuopio University Hospital, P.O. Box 1777, FI-70211 Kuopio, Finland
| | - Kai Härkönen
- Faculty of Health Sciences, Institute of Biomedicine/Anatomy, University of Eastern Finland, School of Medicine, P.O. Box 1627, FI-70211 Kuopio, Finland
| | - Arto Koistinen
- University of Eastern Finland, SIB Labs, P.O. Box 1627, FI-70211 Kuopio, Finland
| | - Kirsi Rilla
- Faculty of Health Sciences, Institute of Biomedicine/Anatomy, University of Eastern Finland, School of Medicine, P.O. Box 1627, FI-70211 Kuopio, Finland
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5
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Yung S, Tsang RCW, Leung JKH, Chan TM. Increased mesangial cell hyaluronan expression in lupus nephritis is mediated by anti-DNA antibody-induced IL-1beta. Kidney Int 2006; 69:272-80. [PMID: 16408116 DOI: 10.1038/sj.ki.5000042] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The mechanism by which anti-DNA antibodies contribute to the pathogenesis of lupus nephritis (LN) remains to be fully elucidated. Hyaluronan (HA) is an important extracellular matrix constituent that accumulates during tissue injury, and participates in lymphocyte recruitment to sites of inflammation. The role of HA in the pathogenesis of LN has not been defined. We investigated the expression of HA in renal biopsies and circulating HA levels in patients with diffuse proliferative LN, and the effect of human anti-DNA antibodies on HA synthesis in cultured human mesangial cells (HMC). HA expression was increased in the mesangium, and in the periglomerular and tubular distribution in LN kidney biopsies. LN patients showed increased levels of circulating HA, especially during active disease, which correlated with anti-DNA antibody titers (r=0.35, P=0.0234). Anti-DNA antibodies isolated during active LN but not remission increased de novo synthesis of (3)H-labeled HA, which was accompanied by induction of HA synthase (HAS) II transcription, and enhanced IL-1beta, IL-6, and tumor necrosis factor-alpha secretion in HMC (P<0.001 for all). Only anti-DNA antibody induction of IL-1beta enhanced HA synthesis, which was abrogated by inhibitors of de novo mRNA or protein synthesis. Our findings demonstrate that HA expression is significantly increased within the mesangium in diffuse proliferative LN mediated through anti-DNA antibody-induced IL-1beta. Given that HA plays a pivotal role during inflammatory responses, influences cellular behavior and assists in the recruitment of lymphocytes to sites of injury, it is likely that HA contributes to the pathogenesis of LN.
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Affiliation(s)
- S Yung
- Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong, China
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6
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Schönherr E, Zhao B, Hausser H, Müller M, Langer C, Wagner WD, Goldberg IJ, Kresse H. Lipoprotein lipase-mediated interactions of small proteoglycans and low-density lipoproteins. Eur J Cell Biol 2000; 79:689-96. [PMID: 11089917 DOI: 10.1078/0171-9335-00103] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
According to numerous studies low-density lipoproteins (LDL) are supposed to interact with the glycosaminoglycan chain(s) of proteoglycans, e.g. with decorin and biglycan, which themselves are subject to receptor-mediated endocytosis. We tested, therefore, whether complexes of LDL and small proteoglycans can be endocytosed by either the LDL- or the small proteoglycan uptake mechanism. However, neither was the endocytosis of LDL significantly influenced by proteoglycans nor that of proteoglycans by LDL. This negative result could be explained by the observation that in vitro complex formation takes place only in buffers of low ionic strength. Under physiological conditions additional molecules may be necessary for complex stabilization. Lipoprotein lipase (LpL) which binds LDL was also able to interact with high affinity with decorin and its glycosaminoglycan-free core protein, both interactions being heparin-sensitive. Regardless of the presence or absence of LDL, LpL stimulated the endocytosis of decorin 1.5-fold, whereas LpL mediated a 4-fold stimulation of LDL uptake in the absence of decorin. No significant additional effect was seen in the presence of small concentrations of proteoglycans whereas in the presence of 1 microM decorin the endocytosis of [125I]LDL was reduced in normal as well as in LDL receptor-deficient fibroblasts. These observations could best be explained by assuming that LpL/LDL complexes are internalized upon binding to membrane-associated heparan sulphate and that small proteoglycans interfere with this process. It could not be ruled out, however, that a small proportion of the complexes is also taken up by the small proteoglycan receptor.
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Affiliation(s)
- E Schönherr
- Institutes of Physiological Chemistry and Pathobiochemistry, University of Münster, Germany.
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7
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Levick JR. A method for estimating macromolecular reflection by human synovium, using measurements of intra-articular half lives. Ann Rheum Dis 1998; 57:339-44. [PMID: 9771207 PMCID: PMC1752616 DOI: 10.1136/ard.57.6.339] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Recent studies show that very large macromolecules in synovial fluid, such as hyaluronan and large proteoglycans, are partially reflected by the synovial lining during fluid drainage, and thus selectively retained within the cavity. Size selective molecular reflection is a fundamental property of membranes, and a method for quantifying the reflective behaviour of human synovium could be of value in several pathophysiological areas. The method proposed here is based on the intra-articular half lives of the macromolecule of interest and of a smaller, easily cleared protein such as albumin. The key relation is derived from the law of conservation of mass, using simple algebra. It is found that, when the intra-articular half lives of albumin and a macromolecular test solute are determined simultaneously, the reflected fraction of the test solute is given by the complement of the half life ratio. Examples are given. Intra-articular half lives can thus be used to consider such questions as whether immune complexes are significantly reflected by the synovial surface, how the reflective property changes in arthritides or with treatment, and how significantly reflection might influence the intra-articular concentration of large "markers" of joint disease activity.
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Affiliation(s)
- J R Levick
- Department of Physiology, St George's Hospital Medical School, Tooting, London
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8
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Coleman PJ, Scott D, Ray J, Mason RM, Levick JR. Hyaluronan secretion into the synovial cavity of rabbit knees and comparison with albumin turnover. J Physiol 1997; 503 ( Pt 3):645-56. [PMID: 9379418 PMCID: PMC1159848 DOI: 10.1111/j.1469-7793.1997.645bg.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
1. Hyaluronan is not only a lubricant but also enhances the synovial lining's resistance to fluid outflow. This finding led to the proposal that hyaluronan (> 2 x 10(6) Da, approximately 210 nm radius) may escape across the synovial lining less freely than smaller solutes (e.g. albumin, 6.7 x 10(4) Da, 3.6 nm radius) or water. Here multiple washouts were used to measure intraarticular hyaluronan mass and secretion rate in rabbit knees, leading to an estimate of hyaluronan turnover time. Plasma albumin permeation into the joint cavity was also measured to enable comparison of turnover times between molecules of very disparate size. 2. Endogenous hyaluronan mass in the joint cavity, analysed by high performance liquid chromatography of joint washes, was 182 +/- 9.9 micrograms (mean +/- S.E.M; n = 21). Since hyaluronan concentration in synovial fluid averages 3.62 +/- 0.19 micrograms microliters-1, the endogenous synovial fluid volume was calculated to be 50 microliters (mass/concentration), about double the aspiratable volume. 3. The hyaluronan secretion rate over 4 h was 4.80 +/- 0.77 micrograms h-1 (n = 5). The rate was significantly higher in contralateral joints expanded by 2 ml Ringer solution (5.80 +/- 0.84 micrograms h-1, n = 5, P = 0.01, Student's paired t test), indicating a stretch/hydration sensitive secretory mechanism. The newly secreted chains ((2.05-2.48) x 10(6) Da) were not significantly different in length from the endogenous chains (2.95 x 10(6) Da). 4. Hyaluronan turnover time, calculated as mass/secretion rate, was 31.4-37.9 h. This is more than an order of magnitude longer than turnover time for intra-articular albumin. The latter, determined from the intra-articular albumin mass and plasma-to-cavity permeation rate was 1.8 h (95% confidence intervals 1.2-3.5 h, n = 9). The big difference in turnover times support the view that, relative to albumin and water, hyaluronan is partially sieved out and retained in the joint cavity by the synovial lining. The lining cell layer is discontinuous, so it appears that interstitial matrix itself acts as a leaky size-selective molecular filter.
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Affiliation(s)
- P J Coleman
- Department of Physiology, St George's Hospital Medical School, London, UK
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9
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Konttinen YT, Ceponis A, Meri S, Vuorikoski A, Kortekangas P, Sorsa T, Sukura A, Santavirta S. Complement in acute and chronic arthritides: assessment of C3c, C9, and protectin (CD59) in synovial membrane. Ann Rheum Dis 1996; 55:888-94. [PMID: 9014582 PMCID: PMC1010340 DOI: 10.1136/ard.55.12.888] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
OBJECTIVES To investigate the role of complement cascade induced damage and protection against it in acute arthritides compared to rheumatoid arthritis and other chronic joint derangements. METHODS C3c, C9, and protectin (CD59) were examined by avidin-biotin-peroxidase complex staining. RESULTS Marked deposits of C3c and C9 were found in synovial vasculature and intercellular matrix of the lining in rheumatoid arthritis and in acute arthritides (including bacterial, reactive, and osteoarthritis flare up). Furthermore, protectin was not visible in synovial lining cells and was relatively weakly expressed in stromal and endothelial cells in rheumatoid arthritis; also in acute arthritides protectin expression was weak. In contrast, C3c and C9 deposits were not found in chronic conditions associated with degenerative diseases (osteoarthritis and osteochondritis dissecans) or mechanical causes (patellar luxation and a ruptured meniscus), in which also the protectin expression was prominent in synovial lining, endothelial and some stromal cells. CONCLUSIONS Activation of the complement in rheumatoid arthritis and in acute arthritides seems to be associated with a decreased protection of synovial cells against cellular effects and lysis mediated by membrane attack complex.
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Affiliation(s)
- Y T Konttinen
- Department of Medicine, Helsinki University of Central Hospital, Finland
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