Leak Syndrome and Perforin in the Induction of Vascular Evidence For
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Evidence for the Involvement of Fas Ligand and Perforin in the Induction of Vascular Leak Syndrome This information is current as Asimah Q. Rafi, Ahmet Zeytun, Michael J. Bradley, D. of October 1, 2021. Phillip Sponenberg, Randolph L. Grayson, Mitzi Nagarkatti and Prakash S. Nagarkatti J Immunol 1998; 161:3077-3086; ; http://www.jimmunol.org/content/161/6/3077 Downloaded from References This article cites 39 articles, 18 of which you can access for free at: http://www.jimmunol.org/content/161/6/3077.full#ref-list-1 http://www.jimmunol.org/ Why The JI? Submit online. • Rapid Reviews! 30 days* from submission to initial decision • No Triage! Every submission reviewed by practicing scientists • Fast Publication! 4 weeks from acceptance to publication *average by guest on October 1, 2021 Subscription Information about subscribing to The Journal of Immunology is online at: http://jimmunol.org/subscription Permissions Submit copyright permission requests at: http://www.aai.org/About/Publications/JI/copyright.html Email Alerts Receive free email-alerts when new articles cite this article. Sign up at: http://jimmunol.org/alerts The Journal of Immunology is published twice each month by The American Association of Immunologists, Inc., 1451 Rockville Pike, Suite 650, Rockville, MD 20852 Copyright © 1998 by The American Association of Immunologists All rights reserved. Print ISSN: 0022-1767 Online ISSN: 1550-6606. Evidence for the Involvement of Fas Ligand and Perforin in the Induction of Vascular Leak Syndrome1 Asimah Q. Rafi,2* Ahmet Zeytun,* Michael J. Bradley,* D. Phillip Sponenberg,† Randolph L. Grayson,‡ Mitzi Nagarkatti,† and Prakash S. Nagarkatti3* Endothelial cell injury resulting in vascular leak syndrome (VLS) is one of the most widely noted phenomenons in a variety of clinical diseases. In the current study we used IL-2-induced VLS as a model to investigate the role of cytolytic lymphocytes in the cytotoxicity of endothelial cells. Administration of IL-2 (75,000 U/mouse, three times a day for 3 days) into BL/6 wild-type mice triggered significant VLS in the lungs, liver, and spleen. Interestingly, perforin-knockout (KO) mice exhibited a marked decrease in IL-2-induced VLS in all three organs tested. Also, Fas ligand-defective (gld) mice and Fas-deficient (lpr) mice exhibited de- creased VLS in the liver and spleen, but not in the lungs. The decreased VLS seen in perforin-KO, gld, and lpr mice was not due to any defect in lymphocyte migration or homing to various organs because histopathologic studies in these mice demonstrated Downloaded from significant and often greater perivascular infiltration of lymphocytes compared with the IL-2-treated wild-type mice. Ultrastruc- tural studies of the lungs demonstrated significant damage to the endothelial cells in IL-2-treated wild-type mice and decreased damage in perforin-KO mice. IL-2 administration caused up-regulation of CD44 in all strains of mice tested and triggered increased LAK activity against an endothelial cell line in wild-type and gld mice, but not in perforin-KO mice. The current study demonstrates for the first time that perforin and Fas ligand may actively participate in endothelial cell injury and induction of VLS in a variety of organs. The Journal of Immunology, 1998, 161: 3077–3086. http://www.jimmunol.org/ t sites of chronic inflammation as seen in a variety of and pulmonary edema (8, 9). Such toxicity results from increased infections, autoimmune diseases, graft-vs-host disease, capillary leak, also known as vascular leak syndrome (VLS).3 A A and during treatment of cancer patients with high doses number of cytokines used as hemopoietic growth factors are also of IL-2, significant damage to the endothelial cells has been known known to trigger VLS (9). The exact mechanism of cytokine-trig- to occur, which leads to severe toxicity or pathogenesis associated gered endothelial cell damage and induction of VLS is not clear. with the disease. For example, in murine lymphocytic choriomen- Several recent studies have suggested that VLS may result from ingitis viral infection, massive delayed-type hypersensitivity reac- actual damage to the endothelial cells caused by cytotoxic lym- tion occurs in the cerebrospinal fluid. It has been speculated that phocytes (10, 11). In contrast, some types of endothelial cell dam- by guest on October 1, 2021 virally activated CD81 T cells kill the endothelial cells, leading to age may result from participation of neutrophils and complement massive extravasation of monocytes and CD41 T cells via the components (12). The fact that CTL are involved in the induction subarachnoid space (1). In multiple sclerosis, damage to the blood- of VLS was demonstrated in a recent study from our laboratory in brain barrier has been known to occur after injury to the endothe- which administration of a CTL clone into a syngeneic irradiated lial cells by cytotoxic T cells (2). Also, in autoimmune disease mouse along with IL-2 led to a significant induction of VLS in models involving vasculitides, the lesions have been associated vivo (13). with infiltration of lymphocytes and macrophages at the vascular In the current study we used VLS as a model to study the en- wall structure (3). Such types of vasculitis have been described in dothelial cell damage seen after IL-2 administration. To directly human and murine autoimmune diseases (4, 5). Similarly, in arte- test the involvement of cytotoxic lymphocytes in endothelial cell riosclerosis, endothelial cell damage and inflammatory cell activa- injury leading to the induction of VLS, we used perforin-knockout tion have been shown to contribute to the further development of (KO) and Fas ligand (FasL)-defective, gld mice, inasmuch as per- the cardiovascular disease (6, 7). forin and FasL have been characterized as two important effector Although IL-2 therapy has yielded encouraging results in the molecules involved in cytotoxicity mediated by CTL and NK/LAK treatment of certain types of cancer, its use is limited by dose- cells (14). The results demonstrated that the VLS was markedly dependent toxicity characterized by weight gain, dyspnea, ascites, decreased in all organs tested in perforin-KO mice and was sig- nificantly decreased in the liver and spleen of gld mice, thereby supporting the hypothesis that VLS results from direct cytotoxicity Departments of *Biology, ‡Plant Pathology, Physiology, and Weed Science, and †Biomedical Sciences and Pathobiology, Virginia-Maryland College of Veterinary of endothelial cells by cytotoxic lymphocytes. Medicine, Virginia Tech, Blacksburg, VA 24061 Received for publication December 5, 1997. Accepted for publication May 11, 1998. Materials and Methods The costs of publication of this article were defrayed in part by the payment of page Mice charges. This article must therefore be hereby marked advertisement in accordance Four to six-week-old female C57BL/6 mice were purchased from the Na- with 18 U.S.C. Section 1734 solely to indicate this fact. tional Institutes of Health (Bethesda, MD). Age-matched B6/gld/gld B6/ 1 This work was supported in part by grants from the American Cancer Society (IM lpr/lpr and perforin-KO mice were bred in our animal facilities. The per- 747) and the National Institutes of Health (AI101392 and HL058641), and by a Gina forin-KO mice were provided by W. K. Clark (University of California, Finzi Memorial Student Fellowship from the Lupus Foundation of America (to A.R.). 2 Address correspondence and reprint requests to Dr. Prakash S. Nagarkatti, Depart- ment of Biology, Virginia Tech, Blacksburg, VA 24061. E-mail address: 3 Abbreviations used in this paper: VLS, vascular leak syndrome; KO, knockout; [email protected] FasL, Fas ligand; PE, phycoerythrin. Copyright © 1998 by The American Association of Immunologists 0022-1767/98/$02.00 3078 VASCULAR LEAK SYNDROME IN FasL-DEFECTIVE AND PERFORIN-DEFICIENT MICE Los Angeles, CA) (15). It should be noted that gld and lpr mice used at 4 Histology to 6 wk of age did not exhibit any lymphoproliferative disease. For histopathologic studies, groups of five separate mice were injected with Cell lines IL-2 or PBS as described above, and on day 4, lungs and liver were fixed in 10% formalin solution. The organs were embedded in paraffin, sec- YAC1, a NK-sensitive Moloney virus-induced lymphoma, and TME-3H3, tioned, and stained with hematoxylin and eosin. Perivascular infiltration an SV40-transformed endothelial cell line, were maintained in vitro by was scaled by counting the number of lymphocytes infiltrating the vessel serial passages, as previously described (13, 16). and averaging the minimum and maximum ranges for each group. Three samples were used for lung, and 10 samples were used for the liver. Antibodies Electron microscopy studies Monoclonal MEL-14 (lymphocyte homing receptor; rat IgG) and anti- Tissue samples were fixed in 5% glutaraldehyde/4.4% formaldehyde/ LFA-1 (M17/4; rat IgG) were grown in vitro as described previously (17). 2.75% picric acid in 0.05 M sodium cacodylate buffer, pH 7.4; washed in The FITC-CD3, PE-CD44, PE-CD8, FITC-CD4, and Jo2 (anti-Fas) mAbs a sodium cacodylate buffer; postfixed in osmium tetroxide; embedded in were purchased from PharMingen (San Diego, CA). FITC-conjugated Polybed 812 resin (Polysciences, Warrington, PA); and studied with an F(ab9) goat anti-Syrian hamster IgG was purchased from Jackson Immu- 2 electron microscope. noResearch Laboratories (West Grove, PA). [125I]BSA was purchased from ICN (Costa Mesa, CA). Statistical analysis ILs The VLS data in different strains of mice were compared using analysis of variance, and p , 0.05 was considered statistically significant. Recombinant IL-2 was provided by Hoffmann-La Roche (Nutley, NJ) and Dr. C. Reynolds (National Institutes of Health). Results VLS induction in wild-type, perforin-KO, FasL-defective (gld), Downloaded from Detection of surface molecules using immunofluorescence and Fas-deficient (lpr) mice analysis To directly test whether VLS seen following injection of IL-2 is Splenic T cells and LN cells were analyzed for CD3 and CD44 expression caused by cytolytic effector molecules such as perforin and FasL, by staining the cells with FITC-CD3- and PE-CD44-labeled Abs for 30 min on ice followed by washing three times.