Fabry Disease in Mice Is Associated With Age-Dependent Susceptibility to Vascular Thrombosis
Daniel T. Eitzman*,
Peter F. Bodary*,
Yuechun Shen*,
Christian G. Khairallah*,
Susan R. Wild,
Akira Abe,
Jacqueline Shaffer-Hartman and
James A. Shayman
Divisions of *Cardiology and Nephrology, Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor, Michigan.
Correspondence to Dr. Daniel T. Eitzman, University of Michigan Medical Center, 7301 MSRB III, 1150 Medical Center Dr., Ann Arbor, MI 49109-0644. Phone: 734-763-7838; Fax: 734-936-2641;
ABSTRACT. Fabry disease is an X-linked lysosomal storage disorderdue to deficiency of -galactosidase A (GLA) activity that resultsin the widespread accumulation of neutral glycosphingolipids.Renal failure, neuropathy, premature myocardial infarction,and stroke occur in patients with this condition primarily dueto deposition of glycosphingolipids in vascular endothelialcells. The clinical consequences of Fabry disease suggest thatvascular thrombosis may play a prominent role in the pathogenesisof this disease; however, the vasculopathy associated with Fabrydisease has not been extensively studied. To determine if micegenetically deficient in Gla are susceptible to vascular thrombosis,a photochemical carotid injury model was used to induce occlusivethrombosis. In this model, Gla-/0 mice displayed a progressiveage-dependent shortening of the time to occlusive thrombosisafter vascular injury that correlated with progressive accumulationof globotriasylceramide (Gb3) in the arterial wall. Bone marrowtransplantation from Gla-/0 to Gla+/0 mice and from Gla+/0 toGla-/0 mice did not change the thrombotic phenotype of the host.These studies reveal a potent vascular prothrombotic phenotypein Gla-deficient mice and suggest that antithrombotic therapiesas well as therapies designed to reduce the vascular accumulationof Gb3 may have beneficial effects on thrombotic complicationsin patients with Fabry disease. E-mail: deitzman@umich.edu
Fabry disease is an X-linked recessive disorder that resultsfrom deficiency of -galactosidase A (GLA) enzymatic activity(1). This enzyme defect leads to widespread accumulation ofneutral glycosphingolipids with -galactosyl linkages consistingprimarily of globotriaosylceramide (Gb3) (2). Clinical manifestationsof Fabry disease include renal failure, painful neuropathies,angiokeratoma, myocardial infarction, and stroke, leading topremature mortality (2). Myocardial infarction and stroke aredue to acute arterial thrombosis (3); therefore, the vascularaccumulation of Gb3 may predispose affected individuals to thesethrombotic complications. However, the thrombophilia associatedwith Fabry disease has not been extensively studied. Recently,a murine model of Fabry disease has been generated by targeteddisruption of the Gla gene (4). These mice accumulate lipidsin multiple organs similar to that observed in humans with Fabrydisease. Thus, they provide a useful model to explore the pathogenesisof Fabry disease. A carotid injury model was used to elicitocclusive thrombosis in Gla-deficient mice and wild-type controlsto determine whether Gla-deficient mice are more susceptibleto arterial thrombosis.
Mice Gla-deficient mice (4) used in these experiments were bred frommice provided by Drs. Ashok Kulkarni and Roscoe Brady (NationalInstitutes of Health, Bethesda, MD). These mice were back-crossedat least four generations to the C57BL6/J strain. Control C57BL6/Jmice were purchased from The Jackson Laboratory, Bar Harbor,ME. All mice were maintained on normal chow in specific pathogen-freefacilities. All animal care and experimental procedures compliedwith the Principals of Laboratory and Animal Care establishedby the National Society for Medical Research and were approvedby the University of Michigan Committee on Use and Care of Animals.
Carotid Arterial Thrombosis Protocol
Arterial thrombosis was performed using a carotid photochemicalinjury model as described previously (5). Briefly, the photochemical,rose bengal, was injected into the mouse tail vein while theright carotid artery was exposed to a green laser light. Therose bengal is activated by the green light, resulting in theliberation of toxic reactive oxygen species such as superoxideanions (6). This type of injury is clinically relevant, as endogenoussuperoxide anions appear to play an important role in the progressionof vascular disease (7). Endothelial damage ensues at the siteof the photochemical injury followed by the formation of a platelet/fibrin-richocclusive thrombus (Figure 1). Flow in the vessel was monitoredcontinuously, using a Doppler flow probe (model 0.5 VB; TransonicsSystems, Ithaca, NY) connected to a flowmeter (Transonics modelT106), throughout the protocol. The endpoint is occlusive thrombosis,defined as zero flow for at least 1 min.
Figure 1. Carotid photochemical injury model. Doppler flow probe monitoring blood flow in right carotid artery, which is being exposed to green light (large arrow). Right lower inset shows gross appearance of clot within carotid artery (small arrow), at which time no flow is apparent by Doppler.
Bone Marrow Transplantation
Bone marrow transplantation experiments were performed similarlyto previously described methods (8). Briefly, 78-d-old Gla-/0and Gla+/0 mice were irradiated (2 x 650 rad) and then injectedthrough the tail vein with 4 x 106 bone marrow cells harvestedfrom the femurs of either Gla-/0 or Gla+/0 mice. Six weeks aftertransplantation, blood was drawn from the retro-orbital sinus,and platelet counts were determined from platelet-rich plasma(Coulter Counter Z2; Beckman Coulter, Miami, FL). Engraftmentwas confirmed by PCR analysis of whole blood using a 3-primersystem designed to recognize the wild-type and mutant alleles(5'-3' wt -TCCACAGCAAAGGATTGAAG and TTCTCCAAGGATACTACACTGTCA;5'-3' mutant - TCCATCTGCACGAGACTAGT). The arterial thrombosisprotocol was performed 3 to 5 d after retro-orbital bleeding.Six weeks after transplantation, the arterial thrombosis protocolwas performed.
Histology
For analysis of vascular Gb3, the arterial vasculature was perfusedwith phosphate-buffered saline, and mid-carotid sections wereexcised and frozen in liquid nitrogen. The sections were stainedfor Gb3 with recombinant verotoxin B subunit provided by DianeCopeland at the Genzyme Corporation (Cambridge, MA). Frozencarotid artery sections were incubated with 1% normal goat serumfor 30 min, rinsed with phosphate-buffered saline, and thenincubated with biotinylated verotoxin B subunit (1 µg/mldiluted in 1% normal goat serum) for 60 min. After rinsing,the verotoxin binding was detected using Histostain SP for AECkit per manufacturers instructions (Zymed). Injured carotidartery sites were stained with Masson trichrome and Carstairsstains. Sections were viewed with a Nikon Eclipse E400 microscope.
Statistical Analyses
The statistical significance of differences in time to occlusionwas determined using t test. P < 0.05 was considered significant.
Effect of Age on Vascular Thrombosis in Gla-Deficient Mice
To determine the effects of Gla deficiency on vascular thrombosis,Gla-/0 and Gla+/0 mice at various ages were studied in the photochemicalvascular thrombosis model. Gla+/0 mice of different ages formedocclusive thrombosis at similar times (Figure 2A). In contrast,the time to occlusive thrombosis in Gla-/0 mice became progressivelyshorter with age. By 100 d of age, the time to occlusive thrombosisin Gla-/0 mice was significantly shorter than Gla-/0 mice lessthan 60 d of age (P < 0.04) or 100-d-old Gla+/0 mice (Figure 2A).This trend became more apparent with increasing age. Representativeflow tracings are shown in Figure 2B. Figure 2C shows typicalhistology of an occlusive thrombus that corresponds to zeroflow. At this stage of injury the wall of the carotid arterylooks unremarkable by light microscopy. No differences in baselinecarotid blood flow between 100-d-old wild-type and 100-d-oldGla-/0 mice were observed (0.46 ± 0.1 and 0.43 ±0.05 ml/min, respectively; P = NS). Thus, Gla-/0 mice exhibiteda progressive increase in vascular thrombotic tendency withage that was not observed in wild-type mice.
Figure 2. Effect of age on thrombosis in Fabry mice. (A) With increasing age, the time to occlusive carotid thrombosis progressively shortens in Fabry mice (filled bar); n = 12, 8, and 6 for ages <60, 100, and 180 d, respectively (*P < 0.05 compared with age-matched wild-type mice), whereas occlusion times in wild-type mice (open bar) are not affected by age; n = 8, 4, and 4. respectively. (B) Representative compressed carotid blood flow tracings from Fabry mice of various ages. (C) Histology of carotid artery. Sections harvested from perfusion fixed mouse carotid arteries 50 min after the onset of photochemical injury. Panel 1 is a Masson trichrome stain demonstrating the widely patent uninjured left carotid artery (x200). Panel 2 is a Masson trichrome stain demonstrating occlusive thrombosis in the injured right carotid artery (x200). Panels 3 and 4 are low-power (x200) and high-power (x1000) views of an injured section stained with Carstairs stain (arterial wall collagen and smooth muscles cells are blue and red, respectively; intraluminal thrombus stains red [fibrin] and faint blue [platelets]). No differences were noted in the appearance of the cross-sections between the groups.
Vascular Gb3 Accumulation with Age in Gla-/0 Mice
Recent studies have documented progressive accumulation of Gb3in various organs with age in Gla-/0 mice (9). In this study,carotid sections were stained with verotoxin to examine therelationship between accumulation of Gb3 in carotid arteriesand enhanced carotid thrombosis after injury. Gb3 staining ofthe carotid arterial wall was only faintly evident in 30-d-oldGla-/0 mice, but the distribution and intensity increased markedlywith age (Figure 3). Thus, the vascular accumulation of Gb3correlated well with the increase in thrombotic tendency observedwith age in the Gla-/0 mice. No Gb3 staining was evident withinthe acute thrombus.
Figure 3. Effect of age on carotid Gb3 accumulation in Fabry mice. Frozen cross-sections of carotid arteries from Fabry mice of various ages stained with biotinylated verotoxin. The sections are from Gla-/0 mice at 30, 60, 100, and 180 d of age. The wild-type (WT) section is representative of a 180-d-old mouse.
Effect of Bone Marrow Transplantation between Gla-/0 and Gla+/0 Mice on Vascular Thrombosis
Bone marrow transplantation was performed from Gla-/0 to Gla+/0mice and from Gla+/0 to Gla-/0 mice to determine whether thesource of the prothrombotic stimulus was due to a bone marrowderivedelement, such as platelets. This is a potentially useful methodto determine the in vivo consequences of altered platelet function(8). There were no differences in platelet counts between Gla-/0and Gla+/0 mice before or after the transplantation. PCR analysisof whole blood from Gla-/0 mice that received Gla+/0 marrowrevealed the presence of only the Gla+ allele, whereas bloodfrom Gla+/0 mice that received Gla-/0 marrow revealed only theGla- allele, consistent with complete engraftment. As shownin Figure 4, the source of the bone marrow did not affect thethrombotic phenotype of the host. Although the times to occlusionwere prolonged in the transplanted mice compared with non-irradiatedmice, the time to thrombosis remained significantly shorterin the Gla-/0 mice (45 ± 6 min; n = 15) compared withthe Gla+/0 mice (67 ± 9 min; n = 8; P < 0.02).
Figure 4. Effect of bone marrow transplantation on thrombosis. No significant differences in the time to occlusive thrombosis were noted between control Gla+/0 mice receiving Gla+/0 marrow (a; (n = 2) and Gla+/0 mice receiving Gla-/0 marrow (b; n = 6). Similarly, no differences were noted between control Gla-/0 mice receiving Gla-/0 marrow (c; n = 7) and Gla-/0 mice receiving Gla+/0 marrow (d; n = 8).
Premature vascular thrombotic events such as stroke and myocardialinfarction are devastating complications of Fabry disease (2).The disease is relatively rare (2); therefore, the true incidenceof these thrombotic complications in Fabry patients is unknown.However, premature obstructive vascular disease due to coronaryglycolipid deposition and premature myocardial infarction havebeen reported in Fabry patients (10). Similarly, cerebrovascularmanifestations due to ischemic stroke have been reported inup to 24% of Fabry patients, with the majority of these eventsoccurring before age 40 (11). Therefore, patients with Fabrydisease are predisposed to premature arterial thrombotic complications.The underlying vascular change predisposing to thrombotic eventsis thought to be vascular accumulation of Gb3, which also playsa role in the other complications of Fabry disease (2). Recentstudies focusing on vascular changes in Fabry patients havedemonstrated evidence of endothelial and leukocyte activation(12) and paradoxically enhanced endothelium-dependent vasodilation(13,14). Gb3 also appears to be a critical mediator of the hemolyticuremic syndrome, which is characterized by widespread thrombosis(15). Verotoxin, which binds to Gb3 to initiate the hemolyticuremic syndrome, has been shown to render endothelial cellshighly thrombogenic in cell culture (16). These studies suggestthat Gb3-ligand interactions may be involved in signaling pathways,leading to a thrombogenic vasculature.
The phenotype of the Gla-deficient mouse model differs fromthe human condition in that the mice do not appear to developrenal failure up to 80 wk of age (9). However, from 10 to 20wk of age, Gb3 has been shown to increase in the kidney andother tissues of these mice. Furthermore, lamellar bodies werenoted within proximal and distal tubular cells, parietal andvisceral glomerular epithelial cells, and peritubular capillaryendothelial cells. Oshima et al. suggested that reduced endotheliallesions in the Fabry mice compared with humans may affect expressionof many of the phenotypic manifestations seen in patients withFabry disease. Thus, although Gla-deficient mice do not completelymimic the disease manifestations of humans with this condition,they serve a useful tool for studying derangements of glycolipidmetabolism. The findings in our study are particularly usefulas they represent the first overt vascular phenotype in thesemice.
In the current study, we demonstrate a potent thrombotic phenotypein Gla-deficient mice that becomes more severe with age. Thisphenotype correlates with progressive accumulation of Gb3 withinthe arterial wall and is not associated with differences inbaseline carotid blood flow. The age dependence of this phenotypesuggests that accumulation of Gb3 within the vascular wall maycontribute to the enhanced thrombogenicity. Bone marrow transplantationfrom Gla-/0 to Gla+/0 mice and from Gla+/0 to Gla-/0 mice didnot affect the host phenotype supporting a prominent contributionby the vascular wall toward the thrombotic phenotype. Furtherstudies are required to identify the precise mechanisms responsiblefor this phenotype. However, these findings provide a usefulmodel for the vasculopathy associated with Fabry disease anda preclinical endpoint for measuring the effectiveness of varioustherapeutic interventions (9,1721) targeting Gb3 accumulationand thrombosis.
Acknowledgments
This work was supported by National Institutes of Health grantsPO1HL5734 (to Dr. Eitzman) and RO1DK55823 (to Dr. Shayman).
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Received for publication July 9, 2002.
Accepted for publication October 16, 2002.
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