Hostname: page-component-76fb5796d-5g6vh Total loading time: 0 Render date: 2024-04-25T12:43:28.884Z Has data issue: false hasContentIssue false

Osteopontin in macrophage function

Published online by Cambridge University Press:  26 April 2011

Susan R. Rittling
Affiliation:
The Forsyth Institute, 245 First St, Cambridge, MA 02142, USA. E-mail: srittling@forsyth.org

Abstract

The secreted phosphorylated protein osteopontin (OPN) is expressed in a variety of tissues and bodily fluids, and is associated with pathologies including tissue injury, infection, autoimmune disease and cancer. Macrophages are ubiquitous, heterogeneous cells that mediate aspects of cell and tissue damage in all these pathologies. Here, the role of OPN in macrophage function is reviewed. OPN is expressed in macrophage cells in multiple pathologies, and the regulation of its expression in these cells has been described in vitro. The protein has been implicated in multiple functions of macrophages, including cytokine expression, expression of inducible nitric oxide synthase, phagocytosis and migration. Indeed, the role of OPN in cells of the macrophage lineage might underlie its physiological role in many pathologies. However, there are numerous instances where the published literature is inconsistent, especially in terms of OPN function in vitro. Although the heterogeneity of OPN and its receptors, or of macrophages themselves, might underlie some of these inconsistencies, it is important to understand the role of OPN in macrophage biology in order to exploit its function therapeutically.

Type
Review Article
Copyright
Copyright © Cambridge University Press 2011

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

References

1Senger, D.R. et al. (1989) Purification of a human milk protein closely similar to tumor-secreted phosphoproteins and osteopontin. Biochimica Biophysica Acta 966, 43-48CrossRefGoogle Scholar
2Oldberg, A., Franzen, A. and Heinegard, D. (1986) Cloning and sequence analysis of rat bone sialoprotein (osteopontin) cDNA reveals an Arg-Gly-Asp cell-binding sequence. Proceedings of the National Academy of Sciences of the United States of America 83, 8819-8823Google Scholar
3Brown, L.F. et al. (1992) Expression and distribution of osteopontin in human tissues: widespread association with luminal epithelial surfaces. Molecular Biology of the Cell 3, 1169-1180Google Scholar
4Rittling, S.R. et al. (2003) Osteopontin, a surprisingly flexible cytokine: functions revealed from knockout mice. In Contemporary Immunology: Cytokine Knockouts (2nd edn) (Fantuzzi, G., ed.), pp. 379-393, Humana Press Inc., Totowa, NJCrossRefGoogle Scholar
5Weber, G.F. and Cantor, H. (1996) The immunology of Eta-1/osteopontin. Cytokine and Growth Factor Reviews 7, 241-248CrossRefGoogle ScholarPubMed
6Rittling, S.R. and Chambers, A.F. (2004) Role of osteopontin in tumour progression. British Journal of Cancer 90, 1877-1881CrossRefGoogle ScholarPubMed
7Ramaiah, S.K. and Rittling, S. (2007) Role of osteopontin in regulating hepatic inflammatory responses and toxic liver injury. Expert Opinion on Drug Metabolism and Toxicology 3, 519-526CrossRefGoogle ScholarPubMed
8Giachelli, C. (2005) Inducers and inhibitors of biomineralization: lessons from pathological calcification. Orthodontics and Craniofacial Research 8, 229-231CrossRefGoogle ScholarPubMed
9Scatena, M., Liaw, L. and Giachelli, C.M. (2007) Osteopontin: a multifunctional molecule regulating chronic inflammation and vascular disease. Arteriosclerosis, Thrombosis, and Vascular Biology 27, 2302-2309Google Scholar
10Christensen, B. et al. (2007) Cell type-specific post-translational modifications of mouse osteopontin are associated with different adhesive properties. Journal of Biological Chemistry 282, 19463-19472CrossRefGoogle ScholarPubMed
11Cao, Z. et al. (2008) A novel functional motif of osteopontin for human lymphocyte migration and survival. Molecular Immunology 45, 3683-3692Google Scholar
12Zheng, W. et al. (2009) Role of osteopontin in induction of monocyte chemoattractant protein 1 and macrophage inflammatory protein 1beta through the NF-kappaB and MAPK pathways in rheumatoid arthritis. Arthritis and Rheumatism 60, 1957-1965CrossRefGoogle ScholarPubMed
13Hu, D.D. et al. (1995) A biochemical characterization of the binding of osteopontin to integrins αvβ1 and αvβ5. Journal of Biological Chemistry 270, 26232-26238Google Scholar
14Hu, D.D., Hoyer, J.R. and Smith, J.W. (1995) Calcium suppresses cell adhesion to osteopontin by attenuating binding affinity for integrin αvβ3. Journal of Biological Chemistry 270, 9917-9925CrossRefGoogle Scholar
15Bayless, K.J. et al. (1998) Osteopontin is a ligand for the α4β1 integrin. Journal of Cell Science 111, 1165-1174CrossRefGoogle ScholarPubMed
16Barry, S.T. et al. (2000) Analysis of the alpha4beta1 integrin–osteopontin interaction. Experimental Cell Research 258, 342-351Google Scholar
17Yokosaki, Y. et al. (1999) The integrin alpha(9)beta(1) binds to a novel recognition sequence (SVVYGLR) in the thrombin-cleaved amino-terminal fragment of osteopontin. Journal of Biological Chemistry 274, 36328-36334CrossRefGoogle Scholar
18Barry, S.T. et al. (2000) A regulated interaction between alpha5beta1 integrin and osteopontin. Biochemical and Biophysical Research Communications 267, 764-769CrossRefGoogle ScholarPubMed
19Yokosaki, Y. et al. (2005) Distinct structural requirements for binding of the integrins alphavbeta6, alphavbeta3, alphavbeta5, alpha5beta1 and alpha9beta1 to osteopontin. Matrix Biology 24, 418-427Google Scholar
20Denda, S., Reichardt, L.F. and Müller, U. (1998) Identification of osteopontin as a novel ligand for the integrin α8β1 and potential roles for this integrin–ligand interaction in kidney morphogenesis. Molecular Biology of the Cell 9, 1425-1435CrossRefGoogle ScholarPubMed
21Schack, L. et al. (2009) Osteopontin enhances phagocytosis through a novel osteopontin receptor, the {alpha}X{beta}2 integrin. Journal of Immunology 182, 6943-6950CrossRefGoogle Scholar
22Weber, G.F. et al. (1996) Receptor-ligand interaction between CD44 and osteopontin (ETA-1). Science 271, 509-512CrossRefGoogle Scholar
23Smith, L.L. et al. (1999) CD44 is not an adhesive receptor for osteopontin. Journal of Cellular Biochemistry 73, 20-303.0.CO;2-3>CrossRefGoogle Scholar
24Katagiri, Y.U. et al. (1999) CD44 variants but not CD44s cooperate with beta1-containing integrins to permit cells to bind to osteopontin independently of arginine–glycine–aspartic acid, thereby stimulating cell motility and chemotaxis. Cancer Research 59, 219-226Google Scholar
25Weber, G.F. et al. (2002) Phosphorylation-dependent interaction of osteopontin with its receptors regulates macrophage migration and activation. Journal of Leukocyte Biology 72, 752-761Google Scholar
26Jain, A. et al. (2002) Three SIBLINGs (SmallIntegrin-Binding LIgand, N-linked Glycoproteins) enhance factor H's cofactor activity enabling MCP-like cellular evasion of complement-mediated attack. Journal of Biological Chemistry 277, 13700-13708Google Scholar
27Rittling, S.R. et al. (2002) Tumor-derived osteopontin is soluble, not matrix associated. Journal of Biological Chemistry 277, 9175-9182CrossRefGoogle Scholar
28Christensen, B. et al. (2010) Osteopontin is cleaved at multiple sites close to its integrin-binding motifs in milk and is a novel substrate for plasmin and cathepsin D. Journal of Biological Chemistry 285, 7929-7937Google Scholar
29Agnihotri, R. et al. (2001) Osteopontin, a novel substrate for matrix metalloproteinase-3 (stromelysin-1) and matrix metalloproteinase-7 (matrilysin). Journal of Biological Chemistry 276, 28261-28267Google Scholar
30Sharif, S.A. et al. (2009) Thrombin-activatable carboxypeptidase B cleavage of osteopontin regulates neutrophil survival and synoviocyte binding in rheumatoid arthritis. Arthritis and Rheumatism 60, 2902-2912Google Scholar
31Zohar, R. et al. (2000) Intracellular osteopontin is an integral component of the CD44-ERM complex involved in cell migration. Journal of Cellular Physiology 184, 118-1303.0.CO;2-Y>CrossRefGoogle ScholarPubMed
32Zhu, B. et al. (2004) Osteopontin modulates CD44-dependent chemotaxis of peritoneal macrophages through G-protein-coupled receptors: evidence of a role for an intracellular form of osteopontin. Journal of Cellular Physiology 198, 155-167Google Scholar
33Cantor, H. and Shinohara, M.L. (2009) Regulation of T-helper-cell lineage development by osteopontin: the inside story. Nature Reviews. Immunology 9, 137-141CrossRefGoogle ScholarPubMed
34Inoue, M. et al. (2010) Cutting edge: critical role of intracellular osteopontin in antifungal innate immune responses. Journal of Immunology 186, 19-23Google Scholar
35Rittling, S.R. et al. (1998) Mice lacking osteopontin show normal development and bone structure but display altered osteoclast formation in vitro. Journal of Bone amd Mineral Research 13, 1101-1111CrossRefGoogle ScholarPubMed
36Liaw, L. et al. (1998) Altered wound healing in mice lacking a functional osteopontin gene (spp1). Journal of Clinical Investigation 101, 1468-1478CrossRefGoogle ScholarPubMed
37Lund, S., Giachelli, C. and Scatena, M. (2009) The role of osteopontin in inflammatory processes. Journal of Cell Communication and Signaling 3, 311-322CrossRefGoogle ScholarPubMed
38Wang, K.X. and Denhardt, D.T. (2008) Osteopontin: role in immune regulation and stress responses. Cytokine and Growth Factor Reviews 19, 333-345Google Scholar
39Buback, F. et al. (2009) Osteopontin and the skin: multiple emerging roles in cutaneous biology and pathology. Experimental Dermatology 18, 750-759CrossRefGoogle Scholar
40Bellahcene, A. et al. (2008) Small integrin-binding ligand N-linked glycoproteins (SIBLINGs): multifunctional proteins in cancer. Nature Reviews. Cancer 8, 212-226CrossRefGoogle ScholarPubMed
41Atkins, K. et al. (1998) Coordinate expression of OPN and associated receptors during monocyte/macrophage differentiation of HL-60 cells. Journal of Cellular Physiology 175, 229-2373.0.CO;2-3>CrossRefGoogle ScholarPubMed
42Oyama, Y. et al. (2002) PPARgamma ligand inhibits osteopontin gene expression through interference with binding of nuclear factors to A/T-rich sequence in THP-1 cells. Circulation Research 90, 348-355Google Scholar
43Suzuki, H. et al. (2009) The transcriptional network that controls growth arrest and differentiation in a human myeloid leukemia cell line. Nature Genetics 41, 553-562Google Scholar
44Atkins, K.B., Simpson, R.U. and Somerman, M.J. (1997) Stimulation of osteopontin mRNA expression in HL-60 cells is independent of differentiation. Archives of Biochemistry and Biophysics 343, 157-163CrossRefGoogle ScholarPubMed
45Nakamachi, T. et al. (2007) PPARalpha agonists suppress osteopontin expression in macrophages and decrease plasma levels in patients with type 2 diabetes. Diabetes 56, 1662-1670CrossRefGoogle ScholarPubMed
46Li, X., O'Regan, A.W. and Berman, J.S. (2003) IFN-gamma induction of osteopontin expression in human monocytoid cells. Journal of Interferon and Cytokine Research 23, 259-265CrossRefGoogle ScholarPubMed
47Miyazaki, Y. et al. (1995) Expression of osteopontin in a macrophage cell line and in transgenic mice with pulmonary fibrosis resulting from the lung expression of a tumor necrosis factor-alpha transgene. Annals of the New York Academy of Sciences 760, 334-341CrossRefGoogle Scholar
48Wuthrich, R.P. et al. (1998) Enhanced osteopontin expression and macrophage infiltration in MRL-Fas(lpr) mice with lupus nephritis. Autoimmunity 28, 139-150CrossRefGoogle ScholarPubMed
49Konno, S. et al. (2006) Interleukin-10 and Th2 cytokines differentially regulate osteopontin expression in human monocytes and dendritic cells. Journal of Interferon and Cytokine Research 26, 562-567CrossRefGoogle ScholarPubMed
50Samuvel, D.J. et al. (2010) Adipocyte-mononuclear cell interaction, Toll-like receptor 4 activation, and high glucose synergistically up-regulate osteopontin expression via an interleukin 6-mediated mechanism. Journal of Biological Chemistry 285, 3916-3927CrossRefGoogle ScholarPubMed
51Rollo, E.E. and Denhardt, D.T. (1996) Differential effects of osteopontin on the cytotoxic activity of macrophages from young and old mice. Immunology 88, 642-647CrossRefGoogle ScholarPubMed
52Solinas, G. et al. (2010) Tumor-conditioned macrophages secrete migration-stimulating factor: a new marker for m2-polarization, influencing tumor cell motility. Journal of Immunology 185, 642-652CrossRefGoogle ScholarPubMed
53Ogawa, D. et al. (2005) Liver X receptor agonists inhibit cytokine-induced osteopontin expression in macrophages through interference with activator protein-1 signaling pathways. Circulation Research 96, e59-e67Google Scholar
54Guo, H. et al. (2001) Osteopontin is a negative feedback regulator of nitric oxide synthesis in murine macrophages. Journal of Immunology 166, 1079-1086CrossRefGoogle ScholarPubMed
55Gao, C. et al. (2004) S-nitrosylation of heterogeneous nuclear ribonucleoprotein A/B regulates osteopontin transcription in endotoxin-stimulated murine macrophages. Journal of Biological Chemistry 279, 11236-11243Google Scholar
56Takahashi, F. et al. (2000) Osteopontin is induced by nitric oxide in RAW 264.7 cells. IUBMB Life 49, 217-221CrossRefGoogle ScholarPubMed
57Gao, C. et al. (2005) Transcriptional regulatory functions of heterogeneous nuclear ribonucleoprotein-U and -A/B in endotoxin-mediated macrophage expression of osteopontin. Journal of Immunology 175, 523-530CrossRefGoogle Scholar
58Zhao, W. et al. (2010) Differential expression of intracellular and secreted osteopontin isoforms by murine macrophages in response to toll-like receptor agonists. Journal of Biological Chemistry 285, 20452-20461Google Scholar
59Nares, S. et al. (2009) Rapid myeloid cell transcriptional and proteomic responses to periodontopathogenic porphyromonas gingivalis. American Journal of Pathology 174, 1400-1414CrossRefGoogle ScholarPubMed
60Koguchi, Y. et al. (2002) Penicillium marneffei causes osteopontin-mediated production of interleukin-12 by peripheral blood mononuclear cells. Infection and Immunity 70, 1042-1048Google Scholar
61Khajoee, V. et al. (2006) Novel roles of osteopontin and CXC chemokine ligand 7 in the defence against mycobacterial infection. Clinical and Experimental Immunology 143, 260-268Google Scholar
62Wang, Y. et al. (2000) Increased expression of osteopontin in activated Kupffer cells and hepatic macrophages during macrophage migration in Propionibacterium acnes-treated rat liver. Journal of Gastroenterology 35, 696-701Google Scholar
63Ragno, S. et al. (2001) Changes in gene expression in macrophages infected with Mycobacterium tuberculosis: a combined transcriptomic and proteomic approach. Immunology 104, 99-108CrossRefGoogle ScholarPubMed
64van der Windt, G.J. et al. (2009) Osteopontin is not crucial to protective immunity during murine tuberculosis. Immunology 128, e766-e776CrossRefGoogle Scholar
65Kohan, M. et al. (2007) Enhanced osteopontin expression in a murine model of allergen-induced airway remodelling. Clinical and Experimental Allergy 37, 1444-1454Google Scholar
66Prasse, A. et al. (2009) Essential role of osteopontin in smoking-related interstitial lung diseases. American Journal of Pathology 174, 1683-1691Google Scholar
67Nomiyama, T. et al. (2007) Osteopontin mediates obesity-induced adipose tissue macrophage infiltration and insulin resistance in mice. Journal of Clinical Investigation 117, 2877-2888CrossRefGoogle ScholarPubMed
68Kiefer, F.W. et al. (2008) Osteopontin expression in human and murine obesity: extensive local up-regulation in adipose tissue but minimal systemic alterations. Endocrinology 149, 1350-1357Google Scholar
69Brown, L.F. et al. (1994) Osteopontin expression and distribution in human carcinomas. American Journal of Pathology 145, 610-623Google Scholar
70Kim, J. et al. (2006) Elevated plasma osteopontin levels in patients with hepatocellular carcinoma. American Journal of Gastroenterology 101, 2051-2059CrossRefGoogle ScholarPubMed
71O'Brien, E.R. et al. (1994) Osteopontin is synthesized by macrophage, smooth muscle, and endothelial cells in primary and restenotic human coronary atherosclerotic plaques. Arteriosclerosis and Thrombosis 14, 1648-1656Google Scholar
72Speer, M.Y. et al. (2002) Inactivation of the osteopontin gene enhances vascular calcification of matrix Gla protein-deficient mice: evidence for osteopontin as an inducible inhibitor of vascular calcification in vivo. Journal of Experimental Medicine 196, 1047-1055CrossRefGoogle ScholarPubMed
73Hirota, S. et al. (1993) Expression of osteopontin messenger RNA by macrophages in atherosclerotic plaques. A possible association with calcification. American Journal of Pathology 143, 1003-1008Google ScholarPubMed
74Choi, J.S. et al. (2003) Induction and temporal changes of osteopontin mRNA and protein in the brain following systemic lipopolysaccharide injection. Journal of Neuroimmunology 141, 65-73CrossRefGoogle ScholarPubMed
75Iczkiewicz, J., Rose, S. and Jenner, P. (2005) Increased osteopontin expression following intranigral lipopolysaccharide injection in the rat. European Journal of Neuroscience 21, 1911-1920Google Scholar
76Yan, Y.P. et al. (2009) Osteopontin is a mediator of the lateral migration of neuroblasts from the subventricular zone after focal cerebral ischemia. Neurochemistry International 55, 826-832CrossRefGoogle ScholarPubMed
77Fu, Y. et al. (2004) Spinal root avulsion-induced upregulation of osteopontin expression in the adult rat spinal cord. Acta Neuropathologica (Berlin) 107, 8-16CrossRefGoogle ScholarPubMed
78Zhao, C. et al. (2008) Osteopontin is extensively expressed by macrophages following CNS demyelination but has a redundant role in remyelination. Neurobiology of Disease 31, 209-217CrossRefGoogle Scholar
79Harada, K. et al. (2003) Osteopontin is involved in the formation of epithelioid granuloma and bile duct injury in primary biliary cirrhosis. Pathology International 53, 8-17Google Scholar
80Murry, C.E. et al. (1994) Macrophages express osteopontin during repair of myocardial necrosis. American Journal of Pathology 145, 1450-1462Google ScholarPubMed
81Komatsubara, I. et al. (2003) Spatially and temporally different expression of osteonectin and osteopontin in the infarct zone of experimentally induced myocardial infarction in rats. Cardiovascular Pathology 12, 186-194CrossRefGoogle ScholarPubMed
82Szalay, G. et al. (2009) Osteopontin: a fibrosis-related marker molecule in cardiac remodeling of enterovirus myocarditis in the susceptible host. Circulation Research 104, 851-859CrossRefGoogle ScholarPubMed
83Makiishi-Shimobayashi, C. et al. (2004) Localization of osteopontin at calcification sites of cholesteatoma: possible role as a regulator of deposition of calcium phosphate in the middle ear. Auris, Nasus, Larynx 31, 3-9CrossRefGoogle ScholarPubMed
84Hikita, S.T. et al. (2006) Osteopontin is proinflammatory in experimental autoimmune uveitis. Investigative Ophthalmology and Visual Science 47, 4435-4443CrossRefGoogle ScholarPubMed
85Bosco, M.C. et al. (2009) The hypoxic synovial environment regulates expression of vascular endothelial growth factor and osteopontin in juvenile idiopathic arthritis. Journal of Rheumatology 36, 1318-1329CrossRefGoogle ScholarPubMed
86McKee, M.D. and Nanci, A. (1996) Secretion of osteopontin by macrophages and its accumulation at tissue surfaces during wound healing in mineralized tissues: a potential requirement for macrophage adhesion and phagocytosis. Anatomical Record 245, 394-4093.0.CO;2-K>CrossRefGoogle ScholarPubMed
87Mori, R., Shaw, T.J. and Martin, P. (2008) Molecular mechanisms linking wound inflammation and fibrosis: knockdown of osteopontin leads to rapid repair and reduced scarring. Journal of Experimental Medicine 205, 43-51Google Scholar
88Nakamura, M. et al. (2002) Osteopontin expression in chronic pancreatitis. Pancreas 25, 182-187CrossRefGoogle ScholarPubMed
89Sato, T. et al. (2005) Osteopontin/Eta-1 upregulated in Crohn's disease regulates the Th1 immune response. Gut 54, 1254-1262CrossRefGoogle ScholarPubMed
90White, F.J. et al. (2006) Secreted phosphoprotein 1 (osteopontin) is expressed by stromal macrophages in cyclic and pregnant endometrium of mice, but is induced by estrogen in luminal epithelium during conceptus attachment for implantation. Reproduction 132, 919-929Google Scholar
91Ophascharoensuk, V. et al. (1998) Role of intrinsic renal cells versus infiltrating cells in glomerular crescent formation. Kidney International 54, 416-425Google Scholar
92Hudkins, K.L. et al. (2000) Osteopontin expression in human crescentic glomerulonephritis. Kidney International 57, 105-116CrossRefGoogle ScholarPubMed
93Hartner, A. et al. (2001) Glomerular osteopontin expression and macrophage infiltration in glomerulosclerosis of DOCA-salt rats. American Journal of Kidney Diseases 38, 153-164CrossRefGoogle ScholarPubMed
94Hudkins, K.L. et al. (2001) Osteopontin expression in human cyclosporine toxicity. Kidney International 60, 635-640Google Scholar
95Cao, Z., Cox, A. and Bonnet, F. (2002) Increased osteopontin expression following renal ablation is attenuated by angiotensin type 1 receptor antagonism. Experimental Nephrology 10, 19-25CrossRefGoogle ScholarPubMed
96Tian, S. et al. (2006) Tubulointerstitial macrophage accumulation is regulated by sequentially expressed osteopontin and macrophage colony-stimulating factor: implication for the role of atorvastatin. Mediators of Inflammation 2006, 12919Google Scholar
97Peng, X. et al. (2006) Detection of osteopontin in the pericyst of human hepatic Echinococcus granulosus. Acta Tropica 100, 163-171Google Scholar
98Nishikaku, A.S. et al. (2009) Nitric oxide participation in granulomatous response induced by Paracoccidioides brasiliensis infection in mice. Medical Microbiology and Immunology 198, 123-135CrossRefGoogle ScholarPubMed
99Smith, L.L. et al. (1998) Osteopontin N-terminal domain contains a cryptic adhesive sequence recognized by à 9 á 1 integrin. Journal of Biological Chemistry 271, 28485-28491Google Scholar
100Kazanecki, C.C., Uzwiak, D.J. and Denhardt, D.T. (2007) Control of osteopontin signaling and function by post-translational phosphorylation and protein folding. Journal of Cellular Biochemistry 102, 912-924Google Scholar
101Prieto, J., Eklund, A. and Patarroyo, M. (1994) Regulated expression of integrins and other adhesion molecules during differentiation of monocytes into macrophages. Cellular Immunology 156, 191-211Google Scholar
102Ammon, C. et al. (2000) Comparative analysis of integrin expression on monocyte-derived macrophages and monocyte-derived dendritic cells. Immunology 100, 364-369CrossRefGoogle ScholarPubMed
103Shima, M. et al. (1995) Macrophage-colony-stimulating factor regulates expression of the integrins alpha 4 beta 1 and alpha 5 beta 1 by murine bone marrow macrophages. Proceedings of the National Academy of Sciences of the United States of America 92, 5179-5183CrossRefGoogle ScholarPubMed
104De Nichilo, M.O. and Burns, G.F. (1993) Granulocyte-macrophage and macrophage colony-stimulating factors differentially regulate alpha v integrin expression on cultured human macrophages. Proceedings of the National Academy of Sciences of the United States of America 90, 2517-2521Google Scholar
105Lacy-Hulbert, A. et al. (2007) Ulcerative colitis and autoimmunity induced by loss of myeloid alphav integrins. Proceedings of the National Academy of Sciences of the United States of America 104, 15823-15828CrossRefGoogle ScholarPubMed
106Ashkar, S. et al. (2000) Eta-1 (osteopontin): an early component of type-1 (cell-mediated) immunity. Science 287, 860-864Google Scholar
107Potter, M.R. et al. (2002) Role of osteopontin in murine Lyme arthritis and host defense against Borrelia burgdorferi. Infection and Immunity 70, 1372-1381Google Scholar
108Isoda, K. et al. (2003) Osteopontin transgenic mice fed a high-cholesterol diet develop early fatty-streak lesions. Circulation 107, 679-681CrossRefGoogle ScholarPubMed
109Abel, B. et al. (2005) Osteopontin is not required for the development of Th1 responses and viral immunity. Journal of Immunology 175, 6006-6013CrossRefGoogle Scholar
110O'Regan, A.W., Hayden, J.M. and Berman, J.S. (2000) Osteopontin augments CD3-mediated interferon-gamma and CD40 ligand expression by T cells, which results in IL-12 production from peripheral blood mononuclear cells. Journal of Leukocyte Biology 68, 495-502CrossRefGoogle Scholar
111Zhang, S. and Wang, Q. (2008) Factors determining the formation and release of bioactive IL-12: regulatory mechanisms for IL-12p70 synthesis and inhibition. Biochemical and Biophysical Research Communications 372, 509-512CrossRefGoogle ScholarPubMed
112Konno, S. et al. (2005) Endotoxin contamination contributes to the in vitro cytokine-inducing activity of osteopontin preparations. Journal of Interferon and Cytokine Research 25, 277-282Google Scholar
113Aziz, M. et al. (2009) MFG-E8 attenuates intestinal inflammation in murine experimental colitis by modulating osteopontin-dependent {alpha}v{beta}3 integrin signaling. Journal of Immunology 182, 7222-7232Google Scholar
114Shimizu, S. et al. (2010) Osteopontin deficiency impairs wear debris-induced osteolysis via regulation of cytokine secretion from murine macrophages. Arthritis and Rheumatism 62, 1329-1337CrossRefGoogle ScholarPubMed
115Naldini, A. et al. (2006) Cutting edge: IL-1beta mediates the proangiogenic activity of osteopontin-activated human monocytes. Journal of Immunology 177, 4267-4270Google Scholar
116Patarca, R., Saavedra, R.A. and Cantor, H. (1993) Molecular and cellular basis of genetic resistance to bacterial infection: the role of the early T-lymphocyte activation 1/ osteopontin gene. Critical Reviews in Immunology 13, 225-246Google ScholarPubMed
117Ono, M., Yamamoto, T. and Nose, M. (1995) Allelic difference in the nucleotide sequence of the Eta-1/Op gene transcript. Molecular Immunology 32, 447-448Google Scholar
118Miyazaki, T. et al. (2005) Implication of allelic polymorphism of osteopontin in the development of lupus nephritis in MRL/lpr mice. European Journal of Immunology 35, 1510-1520Google Scholar
119Gao, C. et al. (2003) Osteopontin inhibits expression of cytochrome c oxidase in RAW 264.7 murine macrophages. Biochemical and Biophysical Research Communications 309, 120-125Google Scholar
120Marroquin, C.E. et al. (2004) Osteopontin increases CD44 expression and cell adhesion in RAW 264.7 murine leukemia cells. Immunology Letters 95, 109-112CrossRefGoogle ScholarPubMed
121Vaschetto, R. et al. (2008) Serum levels of osteopontin are increased in SIRS and sepsis. Intensive Care Medicine 34, 2176-2184CrossRefGoogle ScholarPubMed
122Steitz, S.A. et al. (2002) Osteopontin inhibits mineral deposition and promotes regression of ectopic calcification. American Journal of Pathology 161, 2035-2046Google Scholar
123Rollo, E.E., Laskin, D.L. and Denhardt, D.T. (1996) Osteopontin inhibits nitric oxide production and cytotoxicity by activated RAW 264.7 macrophages. Journal of Leukocyte Biology 60, 397-404Google Scholar
124Tian, J.Y. et al. (2000) Regulation of NO synthesis induced by inflammatory mdiators in RAW264.7 cells: collagen prevents inhibition by osteopontin. Cytokine 12, 450-457Google Scholar
125Gao, C. et al. (2007) Osteopontin induces ubiquitin-dependent degradation of STAT1 in RAW264.7 murine macrophages. Journal of Immunology 178, 1870-1881CrossRefGoogle ScholarPubMed
126Guo, H. et al. (2008) Osteopontin mediates Stat1 degradation to inhibit iNOS transcription in a cecal ligation and puncture model of sepsis. Surgery 144, 182-188Google Scholar
127Bourassa, B., Monaghan, S. and Rittling, S.R. (2004) Impaired anti-tumor cytotoxicity of macrophages from osteopontin-deficient mice. Cellular Immunology 227, 1-11Google Scholar
128Heilmann, K. et al. (2009) Osteopontin as two-sided mediator of intestinal inflammation. Journal of Cellular and Molecular Medicine 13, 1162-1174Google Scholar
129Nau, G.J. et al. (1999) Attenuated host resistance against Mycobacterium bovis BCG infection in mice lacking osteopontin. Infection and Immunity 67, 4223-4230Google Scholar
130Pedraza, C.E. et al. (2008) Osteopontin functions as an opsonin and facilitates phagocytosis by macrophages of hydroxyapatite-coated microspheres: implications for bone wound healing. Bone 43, 708-716CrossRefGoogle ScholarPubMed
131Singh, R.P. et al. (1990) Definition of a specific interaction between the early T lymphocyte activation 1 (Eta-1) protein and murine macrophages in vitro and its effect upon macrophages in vivo. Journal of Experimental Medicine 171, 1931-1942CrossRefGoogle Scholar
132Giachelli, C.M. et al. (1998) Evidence for a role of osteopontin in macrophage infiltration in response to pathological stimuli in vivo. American Journal of Pathology 152, 353-358Google Scholar
133Marcondes, M.C. et al. (2008) In vivo osteopontin-induced macrophage accumulation is dependent on CD44 expression. Cellular Immunology 254, 56-62Google Scholar
134Bruemmer, D. et al. (2003) Angiotensin II-accelerated atherosclerosis and aneurysm formation is attenuated in osteopontin-deficient mice. Journal of Clinical Investigation 112, 1318-1331Google Scholar
135Duvall, C.L. et al. (2008) The role of osteopontin in recovery from hind limb ischemia. Arteriosclerosis, Thrombosis, and Vascular Biology 28, 290-295CrossRefGoogle ScholarPubMed
136Nystrom, T., Duner, P. and Hultgardh-Nilsson, A. (2007) A constitutive endogenous osteopontin production is important for macrophage function and differentiation. Experimental Cell Research 313, 1149-1160CrossRefGoogle ScholarPubMed
137Panzer, U. et al. (2001) Monocyte chemoattractant protein-1 and osteopontin differentially regulate monocytes recruitment in experimental glomerulonephritis. Kidney International 59, 1762-1769CrossRefGoogle ScholarPubMed
138Okada, H. et al. (2000) Osteopontin expressed by renal tubular epithelium mediates interstitial monocyte infiltration in rats. American Journal of Physiology. Renal Physiology 278, F110-F121Google Scholar
139Mazzali, M. et al. (2002) Effects of cyclosporine in osteopontin null mice. Kidney International 62, 78-85CrossRefGoogle ScholarPubMed
140Ophascharoensuk, V. et al. (1999) Obstructive uropathy in the mouse: role of osteopontin in interstitial fibrosis and apoptosis. Kidney International 56, 571-580Google Scholar
141Yoo, K.H. et al. (2006) Osteopontin regulates renal apoptosis and interstitial fibrosis in neonatal chronic unilateral ureteral obstruction. Kidney International 70, 1735-1741CrossRefGoogle ScholarPubMed
142Persy, V.P. et al. (2003) Reduced postischemic macrophage infiltration and interstitial fibrosis in osteopontin knockout mice. Kidney International 63, 543-553Google Scholar
143Wolak, T. et al. (2009) Osteopontin modulates angiotensin II-induced inflammation, oxidative stress, and fibrosis of the kidney. Kidney International 76, 32-43CrossRefGoogle ScholarPubMed
144Morimoto, J. et al. (2004) Osteopontin affects the persistence of beta-glucan-induced hepatic granuloma formation and tissue injury through two distinct mechanisms. International Immunology 16, 477-488Google Scholar
145O'Regan, A.W. et al. (2001) Abnormal pulmonary granuloma formation in osteopontin-deficient mice. American Journal of Respiratory and Critical Care Medicine 164, 2243-2247Google Scholar
146Crawford, H.C., Matrisian, L.M. and Liaw, L. (1998) Distinct roles of osteopontin in host defense activity and tumor survival during squamous cell carcinoma progression in vivo. Cancer Research 58, 5206-5215Google ScholarPubMed
147Feng, F. and Rittling, S.R. (2000) Mammary tumor development in MMTV-c-myc/MMTV-v-Ha-ras transgenic mice is unaffected by osteopontin deficiency. Breast Cancer Research and Treatment 63, 71-79Google Scholar
148Cheng, J. et al. (2007) Human macrophages promote the motility and invasiveness of osteopontin-knockdown tumor cells. Cancer Research 67, 5141-5147CrossRefGoogle ScholarPubMed
149Kiefer, F.W. et al. (2010) Neutralization of osteopontin inhibits obesity-induced inflammation and insulin resistance. Diabetes 59, 935-946Google Scholar
150Kwon, H.J. et al. (2010) The role of osteopontin in d-galactosamine-induced liver injury in genetically obese mice. Toxicology and Applied Pharmacology 242, 344-351Google Scholar
151da Silva, A.P. et al. (2009) Osteopontin attenuation of dextran sulfate sodium-induced colitis in mice. Lab Investigation 89, 1169-1181CrossRefGoogle ScholarPubMed
152da Silva, A.P. et al. (2006) Exacerbated tissue destruction in DSS-induced acute colitis of OPN-null mice is associated with downregulation of TNF-alpha expression and non-programmed cell death. Journal of Cellular Physiology 208, 629-639CrossRefGoogle ScholarPubMed
153Zhong, J. et al. (2006) Osteopontin deficiency protects mice from Dextran sodium sulfate-induced colitis. Inflammatory Bowel Diseases 12, 790-796CrossRefGoogle ScholarPubMed

Further reading, resources and contacts

Information about past and present conferences focused on OPN, as well as other information about the protein, can be found at the 2010 FASEB osteopontin conference website:

Sodek, J., Ganss, B. and McKee, M.D. (2000) Osteopontin. Critical Reviews in Oral Biology and Medicine 11, 279-303CrossRefGoogle ScholarPubMed
Ramaiah, S.K. and Rittling, S. (2007) Pathophysiological role of osteopontin in hepatic inflammation, toxicity and cancer. Toxicological Sciences 103, 4-13Google Scholar
Dale, D.C., Boxer, L. and Liles, W.C. (2008) The phagocytes: neutrophils and monocytes. Blood 112, 935-945Google Scholar
Geissmann, F. et al. (2010) Development of monocytes, macrophages, and dendritic cells. Science 327, 656-661CrossRefGoogle ScholarPubMed
Sodek, J., Ganss, B. and McKee, M.D. (2000) Osteopontin. Critical Reviews in Oral Biology and Medicine 11, 279-303CrossRefGoogle ScholarPubMed
Ramaiah, S.K. and Rittling, S. (2007) Pathophysiological role of osteopontin in hepatic inflammation, toxicity and cancer. Toxicological Sciences 103, 4-13Google Scholar
Dale, D.C., Boxer, L. and Liles, W.C. (2008) The phagocytes: neutrophils and monocytes. Blood 112, 935-945Google Scholar
Geissmann, F. et al. (2010) Development of monocytes, macrophages, and dendritic cells. Science 327, 656-661CrossRefGoogle ScholarPubMed