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In Vivo Fragmentation of Heparan Sulfate by Heparanase Overexpression Renders Mice Resistant to Amyloid Protein a Amyloidosis

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In Vivo Fragmentation of Heparan Sulfate by Heparanase Overexpression Renders Mice Resistant to Amyloid Protein a Amyloidosis In vivo fragmentation of heparan sulfate by heparanase overexpression renders mice resistant to amyloid protein A amyloidosis Jin-Ping Li*†, Martha L. Escobar Galvis*‡, Feng Gong*‡§, Xiao Zhang¶, Eyal Zchariaʈ, Shula Metzger**, Israel Vlodavsky††, Robert Kisilevsky‡‡, and Ulf Lindahl* *Department of Medical Biochemistry and Microbiology, Biomedical Center, Uppsala University, Box 582, SE-751 23 Uppsala, Sweden; ¶Department of Public Health and Caring Science, Division of Molecular Geriatrics, Rudbeck Laboratory, Uppsala University, Box 609, SE-751 25 Uppsala, Sweden; Departments of ʈOncology and **Medicine, Hadassah-Hebrew University Medical Center, Jerusalem 91120, Israel; ††Cancer and Vascular Biology Research Center, The Bruce Rappaport Faculty of Medicine, Technion, Haifa 31096, Israel; and ‡‡Department of Pathology and Molecular Medicine, Queen’s University, Kingston, ON, Canada K7L 3N6 Communicated by D. Carleton Gajdusek, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France, March 21, 2005 (received for review December 22, 2004) Amyloid diseases encompass >20 medical disorders that include The results demonstrate that overexpression of heparanase, amyloid protein A (AA) amyloidosis, Alzheimer’s disease, and type resulting in fragmentation of HS chains, affords protection 2 diabetes. A common feature of these conditions is the selective against amyloidosis. organ deposition of disease-specific fibrillar proteins, along with the sulfated glycosaminoglycan, heparan sulfate. We have gener- Materials and Methods ated transgenic mice that overexpress human heparanase and Animals and Amyloid Induction. The homozygous mouse strain have tested their susceptibility to amyloid induction. Drastic short- overexpressing human heparanase (hpa-tg) and the respective ening of heparan sulfate chains was observed in heparanase- control (ctr) mice (C57BL background) were generated as overproducing organs, such as liver and kidney. These sites selec- described (6) and maintained in the animal facility of the tively escaped amyloid deposition on experimental induction of Biomedical Center, Uppsala University. The animal experi- inflammation-associated AA amyloidosis, as verified by lack of ments were performed in compliance with Swedish legislation material staining with Congo Red, as well as lack of associated for animal welfare (approval number C176͞2). Amyloidosis was polysaccharide, whereas the same tissues from control animals induced as described (3). Briefly, amyloid enhancing factor were heavily infiltrated with amyloid. By contrast, the spleens of (AEF), prepared as AA amyloid fibrils (7), was administered i.p. transgenic mice that failed to significantly overexpress heparanase (200 ␮g per mouse, 200 ␮l, n ϭ 6 hpa-tg and n ϭ 6 ctr male mice, contained heparan sulfate chains similar in size to those of control 10 weeks old). Immediately after the administration of AEF, 0.5 spleen and remained susceptible to amyloid deposition. Our find- ml of AgNO3 (2% solution) was injected s.c. into the loose tissue ings provide direct in vivo evidence that heparan sulfate is essential of the back, between the shoulder blades. Mice were killed by for the development of amyloid disease. cervical dislocation 7 days after commencement of the induction protocol. Spleens, livers, and kidneys were dissected from each inflammation ͉ transgenic mice ͉ endo-glucuronidase ͉ Congo red staining animal, fixed overnight in a solution containing 96% ethanol, 1% glacial acetic acid, and 3% distilled water, and stored in 70% ethanol until processed for histological analysis. myloid diseases are characterized by deposition of disease- specific fibrillar proteins (amyloid) in various organs, lead- A Histochemical Analyses. Tissues in 70% ethanol were dehydrated ing to loss of function and to associated clinical symptoms. It has by using standard procedures and embedded in paraffin. Sec- been proposed that heparan sulfate (HS) may facilitate forma- ␮ ͞ tions of 8–10 m were stained with Congo red (8) to detect tion of the nidus and or protofilament around which amyloid amyloid deposition and with sulfated Alcian blue (SAB) (9) to fibrillogenesis takes place and impart stability to the amyloid detect sulfated glycosaminoglycans. The percent tissue area fibril in vivo (1, 2). This notion was supported by the marked ͞ occupied by birefringent Congo red-positive staining in polar- increase in fibrillogenesis in vitro exerted by heparin HS on ized light was determined as described (3) by image analysis by ␤ various amyloidogenic polypeptides, including A and phos- using a program and apparatus from MCID M2 Imaging Research ␣ phorylated tau (Alzheimer’s disease), -synuclein (Parkinson’s (St. Catherine’s, ON, Canada). All comparisons were made after disease), islet amyloid polypeptide (IAPP) (type 2 diabetes), and calibrating the apparatus against a set of standard spleen sections ␤ ␤ 2-microglobulin (chronic hemodialysis-related amyloid). A containing AA amyloid. fibrillogenesis is precluded by agents that block A␤:HS interac- tions (3). The in vivo evidence is circumstantial, primarily Immunohistochemical Detection of Heparanase. The analysis was observations of codistributed HS proteoglycan (HSPG), notably performed as described with minor modifications (6, 10, 11). perlecan, and amyloidogenic peptide in amyloid fibrils (2). Briefly, 8- to 10-␮m sections were deparaffinized and rehy- Heparanase is a mammalian endo-␤-D-glucuronidase that drated. The tissue was then denatured for 3 min in a microwave cleaves HS at a limited number of sites. Cloning of the human oven in citrate buffer (0.01 M, pH 6.0). Blocking steps included MEDICAL SCIENCES heparanase cDNA by several groups suggests that a single successive incubations in 3% H2O2 in methanol and 5% goat dominant HS-degrading endoglycosidase is expressed in mam- malian cells (4, 5). Our recent generation of transgenic mice overexpressing heparanase in various tissues revealed that the Abbreviations: AA, amyloid protein A; HS, heparan sulfate; ctr, control; hpa-tg, heparanase enzyme plays a role in diverse processes such as embryonic transgenic; SAB, sulfated Alcian blue. implantation, mammary gland morphogenesis, hair follicle †To whom correspondence should be addressed. E-mail: [email protected]. growth, and tissue repair (6). In the present study, the differ- ‡M.L.E.G. and F.G. contributed equally to this work. ential expression of heparanase has been exploited to assess the §Present address: Institution of Blood Transfusion, Box 130, Beijing 100850, China. role of HS in amyloid protein A (AA) amyloid generation in vivo. © 2005 by The National Academy of Sciences of the USA www.pnas.org͞cgi͞doi͞10.1073͞pnas.0502287102 PNAS ͉ May 3, 2005 ͉ vol. 102 ͉ no. 18 ͉ 6473–6477 Downloaded by guest on September 28, 2021 serum. Tissue sections were incubated with anti-human hepara- nase antibodies (mAb 130) or with DMEM supplemented with 3.3% horse serum as control, followed by incubation with horseradish peroxidase (HRP)-conjugated goat anti-mouse an- tibodies (The Jackson Laboratory). Color was developed by using Zymed AEC substrate kit (Zymed) for 10 min, followed by counter staining with Mayer’s hematoxylin. The monoclonal mouse anti-human heparanase antibodies (mAb 130) are di- rected against the C terminus of the 50-kDa heparanase subunit and were produced as described (11). These antibodies do not recognize the mouse heparanase and were kindly provided by InSight Ltd (Rehovot, Israel). In Vivo Radiolabeling and Purification of HS. Hpa-tg and ctr mice 35 (male, 10 weeks old) were injected i.p. with 0.5 mCi of Na SO4 (1 Ci ϭ 37 GBq) (Amersham Pharmacia Biosciences) and maintained for2hwithfreeaccesstowater and food. The animals were killed by cervical dislocation, and various organs (liver, kidney, spleen, lung, heart, and brain) were dissected. The heparan sulfate was isolated as described (12). Briefly, the organs were cut into small pieces and homogenized in Tris⅐HCl (50 mM, pH 7.4) extraction buffer containing 4 M urea and 1% Triton X-100 on ice. The homogenates were incubated at 4°C overnight with mild agitation and centrifuged at 2,800 ϫ g for 15 min. The supernatant was mixed with 4 M NaOH to a final concentration of 0.5 M and incubated at 4°C overnight. After neutralization with HCl, the samples were adjusted to 100 mM salt concentration by dilution with the Tris⅐HCl extraction buffer and applied on a DEAE-Sephacel column (2 ml) equilibrated in the same buffer. Columns were washed with acetate buffer (50 mM, pH 4.5) containing 4 M urea until there was no detectable radioactivity in the effluent. Elution was carried out by using the acetate buffer containing 1.5 M NaCl and 4 M urea, pH 4.5. The eluted radiolabeled material was pooled and desalted on a PD-10 column (Amersham Pharmacia Biosciences) in 10% ethanol and lyophilized. The samples were treated with chondroitinase ABC (1 unit͞ml) (Seikagaku, Tokyo) at 37°C overnight, and the free HS chains were recovered by purification on a 1-ml DEAE- Sephacel column connected to an HPLC system (12). Analysis of HS. Purified metabolically 35S-labeled free HS chains Fig. 1. Heparanase mRNA and protein in different organs of hpa-tg vs. ctr were desalted on a PD-10 column (10% ethanol) and lyophilized. mice. (A) Total RNA was hybridized with a 560-bp fragment of the mouse heparanase cDNA (Upper) and reprobed with a MTN ␤-actin probe (Lower). For identification of the products, samples of 5,000 cpm were Overexpression of human heparanase is apparent in all organs analyzed, incubated with bacterial heparinase (1 milliunit) and hepariti- although at markedly different levels. Only a slight overexpression was noted nase (1 milliunit) (Seikagaku) in 100 ␮l of 50 mM Tris⅐HCl in the spleen. Hpa, heparanase. (B) Immunohistochemical staining with anti- buffer (pH 7.2) in the presence of 1.6 mM CaCl2 and 0.005% human heparanase antibody (mAb 130). Abundant heparanase protein ex- BSAfor4hat37°C, and the digests were analyzed by gel pression (reddish color) is seen in the liver and kidney, but not in the spleen, chromatography on a Superose-12 column. For size analysis, of the hpa-tg mice (magnification ϫ40).
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