WO2004004763A2 - Use of hmgb1 in the treatment of tissue damage and/or to promote tissue repair - Google Patents
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Definitions
- HMGBl High mobility group 1 protein
- RAGE receptor for advanced glycation endproducts
- HMGBl is actively secreted by activated monocytes and macrophages (Wang et al., Science 285, 248-251, 1999), and is passively released by necrotic or damaged cells (Degryse et al., J. Cell Biol. 152: 1197-2006, 2001; M ⁇ ller et al. EMBO J., 16, 4337-4340, 2001; Falciola et al., J. Cell
- HMGBl as a late mediator of endotoxin lethality in mice. They showed that monocytes/macrophages stimulated by LPS, TNF or IL-1 secreted HMGBl as a delayed response. In mice, administration of anti-HMGBl antibodies attenuated LPS-induced endotoxemia; conversely, injection of HMGBl caused toxic shock. Moreover, septic patients showed increased serum levels of HMGBl, which correlated with the severity of the infection (US 6,303,321; WO 00/47104). Subsequently, HMGBl was also shown to cause acute lung inflammation when administered intratracheally (Abraham et al., J. Immunol., 165, 2950-2954, 2000).
- Antibodies against HMGBl decreased lung edema and neutrophile migration, whereas they did not reduce the levels of the other proinflammatory cytokines TNF- alpha, IL-lbeta or macrophage-inflammatory-protein-2 (MIP2).
- TNF- alpha IL-lbeta
- MIP2 macrophage-inflammatory-protein-2
- Pituicytes which provide an important link between the immune and the neuroendocrine s-ystems, release HMGBl in response to specific stimuli like TNF-alpha and IL-lbeta, suggesting that HMGBl also participates in the regulation of neuroendocrine and immune responses to inflammatory processes (Wang et al., Surgery, 126, 389-392, 1999).
- most cells including lymphocytes, adrenal cells or kidney cells
- HMGBl secretion requires at least 16 hours after cell stimulation, and thus is a late event in inflammation.
- the role of secreted HMGBl is thus to reinforce and prolong inflammation that was initiated by some other event.
- the authors have now demonstrated that HMGBl released by necrotic cells can be the initial trigger for inflammatory responses, and that released HMGBl itself can activate inflammatory cells.
- HMGBl release and diffusion can take place in a matter of seconds or minutes, and is thus a very early event in inflammation.
- HMGBl The ability of certain cell types to secrete HMGBl without dying must therefore be a type of molecular mimicry: these cells have evolved the ability to secrete the same molecule whose extracellular presence signals tissue damage.
- the authors of the instant invention report that Hmgbl '1' necrotic cells have a greatly reduced ability to promote inflammation, proving that the release of HMGBl can signal the demise of a cell to its neighbors, and tissue damage to rest of the organism.
- apoptotic cells do not release HMGBl even after undergoing secondary necrosis and partial autolysis, and thus fail to promote inflammation even if not promptly cleared by phagocytic cells.
- HMGBl In apoptotic cells HMGBl is firmly bound to chromatin because of generalized chromatin modification, and is released in the extracellular medium (promoting inflammation) if chromatin deacetylation is prevented. Thus, cells undergoing apoptosis are programmed to withhold the signal broadcast by cells damaged or killed by trauma. Therefore, though HMGBl is an abundant component of chromatin, it also has a role as a soluble, extracellular protein.
- HMGBl can promote the migration and the proliferation of cells whose function is to repair tissue damage. Foremost among these cells are stem cells. As an example of stem cell recruitment and proliferation, the authors have demonstrated the effect in vitro and in vivo on vessel-associated stem cells, the mesoangioblasts.
- HMGBl As an example of immediate practical application for HMGBl as a signal for tissue damage, the authors have investigated the regeneration and functional recovery of myocardial tissue after infarction of the heart.
- HMGBl promotes regeneration and functional recovery of infarcted heart.
- Myocardial infarction leads to loss of tissue and impairment of cardiac performance.
- One of the major therapeutic goals of modern cardiology is to design strategies aimed at minimizing myocardial necrosis and optimizing cardiac repair following myocardial infarction.
- transplantation and mobilization of bone marrow cells to the area of the infarction Orlic et al., Circ Res. 27, 1092-1102, 2002
- signals that regulate stem cells homing to areas of tissue injury were not well characterized so far.
- HMGBl may be active in connective tissue regeneration.
- Connective tissue cells are not embriologically related to target cells of the instant invention.
- WO00/47104 claims a pharmaceutical composition for treating conditions (diseases) characterized by activation of the inflammatory cytokines cascade, as sepsis and obesity, comprising an effective amount of an antagonist or inhibitor of HMG-1.
- tissue repair and/or regeneration includes the repair and/or regeneration of areas of necrosis, preferably trauma sites, ischemia sites including infarcted heart, burn sites.
- composition further comprises an effective amount of an anti-inflammation agent.
- an anti-inflammation agent The expert of the field will select the most appropariate anti-inflammation agent.
- the composition further comprises diluents and/or adjuvants for perfusion at the tissue repair site.
- the composition further comprises diluents and/or adjuvants and/or carriers for intramuscular injection.
- the composition is associated to stem cells, preferably mesoangioblasts.
- composition comprising an effective amount of an antagonist of the HMGBl protein for the treatment of adverse effects induced by necrotic tissue, such as recruitment and activation of myeloid cells, loss of the barrier function of endothelia, edema.
- necrotic tissue refers to intestinal infarction, acute pancreatitis and extensive trauma.
- the adverse effects induced by necrotic tissue include long term effects of necrosis, such as sepsis and multiple organ failure.
- HMGBl antagonist comprises but is not limited to HMGBl antibodies and functional recombinant or synthetic portions thereof, interference RNAs, antisense RNAs, synthetic or natural modulators.
- the composition is advantageously administered within 16 hours from the necrotic event. It is another aspect of the invention a method to promote stem cell migration and/or proliferation in cell culture or in vivo comprising the step of exposing such cells to an effective amount of the HMGBl protein or functional parts thereof.
- stem cells are resident cardiac or circulating stem cells.
- HMGBl is released by necrotic cells, but not by apoptotic cells. In such a way, HMGBl can signal tissue damage, since tissue damage produces unprogrammed cell death (necrosis).
- HMGBl released by necrotic cells (in a matter of seconds or minutes) will be the activation of nearby cells, the loss of barrier function of endothelia, the recruitment and activation of myeloid cells, and the triggering of inflammation.
- HMGBl either directly released by necrotic cells, or actively secreted by activated inflammatory cells
- stem cells to the site of tissue damage, and their proliferation.
- HMGBl both adult and embryonic vessel-associated stem cells proliferate when stimulated with HMGBl.
- HMGBl was also able to induce mesoangioblast migration as well as transmigration through an endothelial barrier.
- heparin beads containing HMGBl injected into the tibialis muscle were able to attract meso-angioblasts carrying nuclear lacZ injected into the femoral artery.
- HMGBl promotes regeneration of infarcted hearts. As a matter of fact HMGBl induces newly formed myocytes into the infarcted heart.
- HMGBl thus induces cardiomyocyte proliferation and differentiation in the infarcted heart.
- HMGBl treated hearts improved myocardial function as tested by echocardiographic and hemodynamic parameters.
- the effect of HMGBl on ischemic heart recovery could be due to recruitment/proliferation of resident cardiac stem cells present in the heart and/or to the recruitment/proliferation of circulating stem cells, and/or to the induction of cardiomyocyte proliferation.
- HMGBl -induced cardiac tissue regeneration and its effect on myocardial function recovery is comparable to those observed after stem cell transplantation of hematopoietic stem cells (HSC) injected directly into the heart (Orlic et al., Nature, 410, 701-705, 2001).
- HSC hematopoietic stem cells
- the invention represents a potential novel approach to be used in the treatment of myocardial infarction.
- HMGBl maybe used alone (or in conjunction with cellular therapy) for all types of tissue regeneration. This represents an advantage compared to stem cell-based regeneration procedures, which require GMP extraction and expansion, are subject to transplant rejection/immune response, require bioethical approval and are not easily packaged into an industrial product.
- HMGBl may have the unique capacity of inducing proliferation of cardiomyocytes and thus therapeutic application in several cardiac pathologies.
- HMGBl may be administered as a recombinant protein injected in the contracting wall bordering the infarct or in heparin beads in the tibialis muscle.
- a nucleic acid coding for HMGBl may be carried into cells in appropriate vectors (plasmids, viruses).
- HMGBl an inflammatory molecule.
- 200 ng of protein was injected in the anterior and posterior aspects of the viable myocardium bordering the infarct.This dose is around 2000 times lower than the dose required for systemic inflammation.
- FIG. 1 Chromatin association of HMGBl in living and dead HeLa cells.
- the medium bathing the cells S was analyzed by SDS-PAGE alongside with the cells (P).
- Histones were visualized by Coomassie staimng, HMGBl by immunob lotting or immunostaining with anti-HMGBl antibodies, DNA with DAPI.
- Scale bars 7.5 ⁇ m.
- a Living cells expressing HMGB1-GFP, imaged by differential interference contrast and in green fluorescence
- b Interphase cells, after permeabilization.
- c Necrotic cells, no permeabilisation.
- the amount of HMGBl in the medium was proportional to the number of necrotic cells (about 50%).
- d Apoptotic cells, with permeabilization.
- e Kinetics of HMGBl and lactate dehydrogenase (LDH) release from cells undergoing apoptosis and secondary necrosis.
- LDH lactate dehydrogenase
- FIG. 2 HMGBl dynamics in living and apoptotic cells. Scale bars, 2.3 ⁇ m (a, b) and 3.7 ⁇ m (e, f).
- FIG. 3 Chromatin changes occurring in apoptosis create binding substrates for HMGBl. Scale bar, 9.5 ⁇ m.
- HMGBl Bacterially made HMGBl (either labelled with Cy5, a, or unlabelled, b) binds to the chromatin of apoptotic Hmgbl' ⁇ ' fibroblasts, but not to that of non-apoptotic fibroblasts, as visualized by microscopy (a) or Western blotting (b). Histones were visualized by Coomassie staining, c, DNA fragmentation is not responsible for HMGBl binding to apoptotic nuclei.
- HeLa cells (expressing a tagged form of ICAD, or control) were induced into apoptosis (apoptotic, lanes 2 and 4) or were mock treated (living, lanes 1 and 3).
- ICAD in apoptosis is cleaved by caspases and loses the FLAG tag (Western, anti-FLAG antibodies; lane 4).
- Agarose gel electrophoresis evidences the intemucleosomal cleavage of chromosomal DNA in apoptotic wild type cells (lane 2), and its inhibition in apoptotic ICAD-expressing cells (lane 4).
- ICAD-expressing apoptotic cells were permeabilised, fixed and stained for DNA, HMGBl and TUNEL.
- HMGBl was firmly retained into the nucleus of the cell showing chromatin condensation (in upper right corner), d,
- Total extracts from about 5 million living and apoptotic HeLa cells were subjected to 2-D electrophoresis and immunoblotted with anti-HMGBl antibodies. Multiple acetylated forms of HMGBl are visible, but no difference is detectable between the two samples, e, Histone H4 in apoptotic cells is hypoacetylated. Immunoblotting was performed with RIO antibody (specific for the acetylated forms of H4).
- HMGBl release promotes inflammatory responses
- b Apoptotic cells undergoing secondary necrosis and partial autolysis do not promote inflammatory responses, unless HMGBl is mobilized by treatment with TSA. The experiment was repeated 3 times in duplicate, with 2 different amounts of apoptotic cells to ensure linearity in TNF-alpha production.
- FIG. 5 HMGBl chemotactic assay on staminal cells. Chemotaxis assays were performed using modified Boyden chambers. The value of 1 corresponds to the number of cells migrating in the absence of any stimulator (random cell migration). The data represent the mean ⁇ SE. The statistical significance of the result is
- FIG. 6 Growth curve of staminal cells in the presence of HMGBl. 5xl0 4 D18 cells were plated in 3 cm wells and grown for 24 hours at 37°C in 5% CO 2 in RPMI supplemented with 20% fetal bovine serum (FBS). Medium was then replaced with RPMI (no serum) for 16 hours. Subsequently the medium was replaced with fresh media containing RPMI alone, RPMI plus 20% FBS, and RPMI with HMGBl at the indicated concentrations (no serum). Cells were harvested at the indicated times
- FIG. 7 Effect of HMGBl on embryonic mesoangioblast proliferation.
- B D16 cell division was analyzed by FACS: after 6 hours in the presence of 30 ng/ml HMGBl the DNA content increases, but returns to the normal diploid content after 24 hours. The asterisk indicates statistical significance (pO.OOl).
- C 3T3 fibroblasts (treated as the D 16 cells in panel A) do not divide in the presence of HMGB 1.
- D16 cells were placed at time 0 in RPMI medium containing 30 ng/ml HMGBl; a similar amount of HMGBl was also added at the times indicated with a triangle. Multiply- stimulated D16 cells kept growing. Each point represents the average ⁇ SD of two experiments performed in duplicate.
- Inset panel Western blot of HMGBl in the medium bathing D16 cells 48 hours after the beginning of the experiment. HMGBl was still present in the medium of restimulated cells but not in the medium of cells stimulated once at time 0. This experiment was repeated 2 times with similar results.
- D16 cells were subjected to chemotaxis assays in Boyden apparatuses with 10, 50, or 100 ng/ml HMGBl. Data represent the average ⁇ SD of four experiments performed in duplicate; the effect of increasing HMGBl concentrations is highly significant (p ⁇ 0.001 in ANOVA analysis). Addition of anti-HMGBl antibodies recognizing the peptide 166-181 significantly reduced the chemotactic response (p ⁇ 0.05 in comparison to the sample without antibody), while the addition of monoclonal anti- boxA antibodies had no effect. (B) Chemotactic activity on D16 cells of various HMGBl fragments (all at 10 ng/ml).
- HMGBl induces the transit of mesoangioblasts through an endothelial monolayer.
- BAEC Bovine primary endothelial cells
- Embryonic mesoangioblasts were placed in the upper compartment of Boyden apparatuses; the lower chambers contained RPMI alone (medium), RPMI plus 100 ng/ml HMGBl or RPMI plus 10 ng/ml VEGF; chambers were separated by a confluent endothelial cell monolayer grown on polycarbonate filters. HMGBl significantly stimulated D16 transmigration (p ⁇ 0.01). Bars represent the average ⁇ SD of three experiments performed in duplicate. The panels above the bar graph show D16 cells stained with
- HMGBl attracts mesoangioblasts in vivo.
- D16 cells were first transduced with a lentiviral vector encoding nuclear LacZ and then injected through the femoral artery of mice where heparin beads (either loaded with HMGBl or unloaded) had been injected in the tibialis anterior muscle. Mice were then sacrificed after 24 hours.
- A Tibialis anterior muscles injected with HMGBl -loaded and control beads.
- B, C, D Criosections of muscles treated with control heparin beads (B) or HMGBl -coated heparin beads (C, D). Arrows indicate the beads. Sections were stained with X-gal and mesoangioblasts (arrowheads) appear blue.
- Mesoangioblasts were found in large clusters (C) or as isolated cells (D) only in muscles injected with HMGBl -coated beads.
- FIG. 12 Effect of HMGBl on adult mesoangioblasts.
- A Mesoangioblasts of the Gl clone, obtained from mouse bone marrow, were grown in RPMI medium containing of 1, 10, or 30 ng/ml HMGBl. For comparison Gl cells were also grown in RPMI medium alone or RPMI plus 20% FCS.
- B Migration of Gl cells towards the lower chamber of Boyden apparatuses containing RPMI (medium) or RPMI plus 10 ng/ml HMGBl (HMGBl). In the “migration” experiment the chambers were separated by a filter, in the "transmigration” experiment the chambers were separated by a filter overlayed with a monolayer of endothelial cells.
- HMGBl treatment improves myocardial function: echocardiographic studies. Representative echocardiography of control (non-infarcted) and infarcted mice (left panel). Ejection fraction (EF) calculated by echocardiography (right panel). Results are means ⁇ standard deviation (SD). * PO.05 HMGBl vs. GST.
- HMGBl treatment improves myocardial function: hemodynamic studies.
- MI myocardial infaction
- LVDP developed pressure
- LVEDP left ventricular end-diastolic pressure
- LV+dP/dt rate of pressure rise
- LV-dP/dt rate of pressure decay
- HMGBl High mobility group proteins have been renamed recently. Previous/alternative names for HMGBl are High mobility group 1, HMG1, HMG-1, amphoterin, and p30. Cloning, expression and purification of HMGBl protein and fragments
- Plasmid pEGFP -HMGBl was generated by inserting the coding sequence of the cDNA for rat HMGBl into pEGFP-Nl (Clontech) using the EcoRl and Sacll restriction sites.
- pEGFP-Hlc, pEGFP-NFl, pEGFP-HMGN2, and pEF-flag-mlCAD were generously provided by A. Gunjan, N. Bhattacharyya, R. Hock, M. Bustin and
- HeLa cells and fibroblasts were grown as described (Calogero et al., Nature Genet. 22, 276-280, 1999). HeLa cells were electroporated with pEGFP- HMGBl and were observed 18 h later. The average amount of HMGBl -GFP in the cell population was between 1 and 3% of HMGBl (by immunob lotting with anti- HMGBl antibodies).
- HMGBl -GFP varied at most tenfold between different cells; care was taken to always use for analysis cells with a moderate fluorescence level.
- Apoptosis was induced by treating the cells for 16 h with 2 ng/ml human TNF-alpha and 35 ⁇ M cycloheximide. Necrosis was induced by treatment for 16 h either with 5 ⁇ M ionomycin and 20 ⁇ M CCCP, or 6 mM deoxyglucose and 10 mM sodium azide, or by 3 cycles of freezing and thawing.
- TUNEL Apoptosis detection system, Promega
- DNA was extracted and electrophoresed on a 1.5% agarose gel. Indirect immunofluorescence was performed as described (Degryse et al., J. Cell Biol., 152, 1197-2006, 2001) using an anti-HMGBl polyclonal antibody (Pharmingen) at 1:1600 dilution, and FITC- or TRIC-conjugated anti-rabbit antibodies (Boehringer) at 1:300 dilution.
- Hmgbl''' fibroblasts were treated with 2 ng/ml hTNF-alpha and 35 ⁇ M cycloheximide. After 16 h, apoptotic cells were recovered by gentle flushing of the dish. Ten million apoptotic Hmgbl"'' fibroblasts and a control population of non- apoptotic ones were resuspended in 50 ⁇ l PBS containing 0.32 M sucrose, 0.5% NP- 40 and 1 ⁇ M bacterially produced HMGBl, either fluorescently labelled with Cy5 (Pharmacia) or unlabelled. Average labelling was 2.3 Cy5 molecules per HMGBl molecule. After 30 minutes at room temperature, sample cells were mixed and mounted on slides using Vectashield (Vector Laboratories) containing 1.5 ⁇ g/ml
- HMGBl recombinant HMGBl bound to apoptotic and non-apoptotic chromatin was determined by immunoblotting using an anti-HMGBl antibody (Pharmingen) at 1:3000 dilution. Aliquots of apoptotic and non-apoptotic chromatin were also probed with anti-acetyl-histone H4 (R10, a gift from B. Turner), anti-acetyl-Histone H3 (Lys
- Inflammation assays To measure TNF-alphaproduction in vitro, bone marrow was recovered from the hind legs of female C56B16 mice, diluted to 5 10 6 cells/ml in Optimem and dispensed in 96-well microtiter plates (120 ⁇ l per well). Necrotic cells (lysed by 3 cycles of freeze-thawing) or apoptotic cells were added to the indicated final concentration into the wells and incubated at 37°C for 18 hours. TNF-alpha in the supernatant was assayed by ELISA (Quantikine M, R&D Systems).
- TSA was added at 200 ng/ml together with TNF- alpha, when indicated, and was washed away before mixing the apoptotic cells with bone marrow cells.
- one day old mice (weighing 1.1+ 0.1 grams) were injected intraperitoneally with 20 ⁇ l of PBS containing 320 ⁇ g of acetaminophen (Sigma), and 320 ⁇ g of antibodies (Pharmingen BD) where indicated. After 9 hours the mice were analyzed for serum ALT activity with the GP-Transaminase kit (Sigma) and for MPO activity in liver extracts as described (Kato et al., Am. J. Pathol. 157: 297-302, 2000).
- HMGBl associates and dissociates rapidly from chromatin.
- HMGBl was tagged with GFP at its C terminus, forming a chimeric protein that was equivalent to the unperturbed HMGBl in enhancing the expression of a HOXD9-responsive reporter gene in transfection assays (Zappavigna et al., EMBO J., 15, 4981-4991, 1996).
- HeLa cells expressing the fusion protein were easily detectable by the uniform green fluorescence of their nuclei.
- Cells undergoing mitosis showed a diffuse cytoplasmic fluorescence, but also a distinct association of HMGBl -GFP to condensed chromosomes, that lasted throughout M phase (Fig. la).
- HMGBl -GFP transfected HeLa cells were permeabilized with NP-40, most lost their fluorescence after a few seconds, confirming the loose association of HMGBl to chromatin. However, a few cells retained a bright fluorescence. From the characteristically fragmented appearance of their nuclei, these cells appeared apoptotic. HeLa cells were then forced to undergo apoptosis by treatment with TNF- alpha and cycloheximide, permeabilized, and immunostained for their endogenous, unmodified HMGBl. Whereas control non-apoptotic cells leaked all HMGBl into the medium (Fig. lb,d), the protein was retained within the nucleus of apoptotic cells (Fig.
- HMGBl was mostly retained associated with nuclear remnants even after prolonged incubation and partial autolysis of apoptotic cells, when soluble cytoplasmic proteins like lactate dehydrogenase (LDH) leaked into the extracellular medium (Fig. le).
- LDH lactate dehydrogenase
- HMGBl and HMGBl -GFP also bound tightly to chromatin in HeLa and 3T3 cells induced into apoptosis by etoposide or H2O2 treatment, or apoptosing spontaneously in unperturbed cultures (data not shown).
- HMGBl dissociated from the chromatin of necrotic cells and leaked to the extracellular medium (Fig. lc).
- HMGBl -GFP condensed chromosomes of living HeLa cells during mitosis. Repeated bleaching of cytoplasmic HMGBl -GFP led to rapid and parallel loss of fluorescence from condensed chromosomes and from the cytoplasm (Fig. 2b,d), proving unequivocally that HMGBl turns over fast between the chromatin-bound and soluble states.
- HMGBl -GFP appeared almost immobile in apoptotic cells (Fig. 2e,g).
- the blockade of HMGBl is specific, since the mobility of GFP-HMGN1, GFP-HMGN2, GFP-NF1 and GFP alone is not reduced in apoptotic cells as opposed to living ones (Fig. 2h and results not shown).
- chromatin condensation during apoptosis does not impair protein mobility in general.
- Hmgbl'l' cells offered us the opportunity to test whether the binding of HMGBl to apoptotic chromatin was due to alterations of HMGBl, or of nuclei undergoing apoptosis.
- Embryonic fibroblasts obtained from HmgbH' and Hmgbl + / + mice Calogero et al., Nature Genet., 22, 276-280, 1999) were equally susceptible to apoptosis (not shown), indicating that freezing of HMGBl onto chromatin is a consequence of apoptosis, but not a requisite.
- Hmgbl' 1 fibroblasts were treated with TNF-alpha and cycloheximide, and apoptotic cells were recovered from the flask by gentle flushing. This cell population, and a control population of non-apoptotic Hmgbl'/' fibroblasts, were permeabilized with detergent and exposed to bacterially produced, Cy5-labelled HMGBl. HMGBl bound to apoptotic nuclei, but not to non- apoptotic ones (Fig. 3 a). This result was confirmed biochemically (Fig.
- HMGBl binds tightly to in vitro reconstructed mononucleosomes (Falciola et al., J. Cell Biol., 137, 19-26, 1997), the authors tested whether the fragmentation of chromatin to oligo- and mononucleosomes that occurs in the later stages of apoptosis would provide stable binding sites for HMGBl.
- HeLa cells were stably transfected with a construct expressing ICAD, the inhibitor of the CAD nuclease that fragments DNA during apoptosis.
- HeLa cells overexpressing ICAD underwent apoptosis, but their DNA showed little if any fragmentation (Enari, et al., Nature, 391, 43-50, 1998) (Fig. 3c).
- HMGBl bound equally stably to ICAD- expressing, nonfragmented chromatin, and to fragmented chromatin (Fig. 3 c). DNA fragmentation therefore cannot account for stable HMGBl binding in apoptosis. Alteration of the acetylation status of chromatin was tested next. TSA, a general deacetylase inhibitor, was added to the medium of HeLa cells just prior to the induction of apoptosis: in this case, HMGBl freezing onto chromatin was suppressed (Fig. 2f,g). This result suggests that hypoacetylation of one or more chromatin components occurs during apoptosis, and favors HMGBl binding.
- TSA a general deacetylase inhibitor
- HMGBl binding to chromatin depends on the viability of the cell, and clearly distinguishes necrotic from apoptotic cells.
- the differential release of HMGBl might be exploited as a cue to nearby cells to activate the appropriate responses to unprogrammed and programmed cell death.
- Unprogrammed death is usually the result of trauma, poisoning or infection, all events that require prompt reaction and damage containment and/or repair.
- Inflammation is the primary tissue damage response in mammals, and HMGBl has already been reported to be a mediator of inflammation (Wang et al., Science, 285, 248-251, 1999; Abraham et al.
- HMGBl is one of the major diffusible signals of necrosis.
- apoptotic cells escape the inflammatory surveillance because they retain HMGBl : apoptotic cells start to leak out cellular components only after several hours, and in vivo they are routinely cleared by phagocytic cells well before this process (termed secondary necrosis) can take place.
- the authors could nonetheless test whether cells undergoing post-apoptotic, secondary necrosis are able to promote inflammatory responses in monocytes. Wild type, apoptotic fibroblasts were incubated with for 72 hours, until most LDH was released in the extracellular medium; the post-apoptotic cell remnants did not promote a strong inflammatory response in monocytes (Fig. 4b).
- fibroblasts treated with TSA while undergoing apoptosis generated secondarily necrotic cell remnants that promoted inflammation as vigorously as primary necrotic cells killed by freeze-thawing.
- the authors could not test whether Hmgbl ' / ' mice have a reduced inflammatory response following tissue necrosis, because these mice survive only a few hours after birth (Calogero et al., Nature Genet., 22, 276-280, 1999).
- massive hepatocyte necrosis was induced in wild type mice and the inflammatory response was measured.
- an overdose of the analgesic acetaminophen produces large areas of liver necrosis, concomitant with local inflammation, Kupffer cell activation and the recruitment and sequestration of neutrophils and macrophages into the injured tissue (Lawson et al., Toxicol Sci., 54, 509-516, 2000; Thomas, Pharmacol. Ther., 60, 91-120, 1993). Levels of liver damage and neutrophil sequestration are strictly proportional until most hepatocytes become necrotic between 12 and 24 hours after AAP poisoning (Lawson et al., Toxicol Sci., 54, 509-516, 2000).
- mice administered 300 mg/kg AAP with a single intraperitoneal injection to young mice, and 9 hours later estimated liver injury by measuring alanine transaminase (ALT) activity in serum, and inflammatory cell sequestration by measuring myeloperoxidase (MPO) activity in total liver extracts.
- ALT alanine transaminase
- MPO myeloperoxidase
- HMGBl can derive from activated monocytes and macrophages in our experiment, because HMGBl secretion from inflammatory cells requires at least 16 hours (Wang et al., Science, 285, 248-251, 1999; Abraham et al. J. Immunol., 165, 2950-2954, 2000; Andersson et al., J. Exp. Med. 192, 565-570, 2000).
- HMGBl acts as an immediate trigger of inflammation, as well as a late mediator of inflammation as previously described (Wang et al., Science, 285, 248-251, 1999).
- HMGBl has chemotactic activity on D18 mouse mesoangioblasts derived from fetal aorta cells (Minasi et al., Development. 129, 2773-83, 2002).
- Mesoangioblastic stem cells can be derived from mouse fetal aorta cells but also from umbilical chord cells, peripheral blood vessels and bone marrow ckit+ cells in post-natal mice. Once derived from these original cell populations with a proprietary method (described in Minasi et al., Development. 129, 2773-83, 2002), mesangioblastic cells, of which D18 are an example, are 'naturally' immortalized (they grow indefinitely).
- D18 cells serve as precursor of the following mesodermal tissue types: bone, cartilage, skeletal smooth and cardiac muscle, endothelial cells, monocytes, macrophages and osteoclasts. They are also capable of generating hepatocytes and neurons.
- Clone D18 was deposited according to the Budapest Treaty at CBA, Centra Biotecnologie Avanzate, Genova, Italy, N. PDO2005). Chemotaxis assays were performed using modified Boyden chambers. The value of 1 corresponds to the number of cells migrating in the absence of any stimulator (random cell migration). The data represent the mean ⁇ SE. The statistical significance of the result is O.0001 in an ANOVA model.
- Treatment with HMGBl plus anti-HMGBl gave results that did not differ statistically from the unstimulated control.
- Treatment of D18 cells with the anti-HMGBl antibody alone, or an unspecific antibody also were indistinguishable from the unstimulated control.
- Stem cells are expected to proliferate at the site where tissue repair must take place.
- HMGBl could also stimutate stem cell proliferation.
- Stem cells in RPMI with no serum did not divide, while cells in RPMI with no serum but in the presence of HMGBl divided actively for at least 24 hours, and then more slowly due to nutrient exhaustion.
- day 3 nonetheless, all plates with D18 cells stimulated with HMGBl (at all concentrations) contained some dividing cells, as evaluated by microscopic inspection.
- HMGBl Extracellular HMGBl, a signal of tissue damage, induces mesoangioblast migration and proliferation
- MATERIALS and METHODS Cells Bovine Aorta Endothelial Cells (BAEC) were isolated from a section of the thoracic aorta of a freshly slaughtered calf as described (Palumbo al., Arterioscler. Thromb. Vase. Biol., 22, 405-11, 2002).
- Mesoangioblasts were isolated from the dorsal aorta of mouse embryos and from juvenile arteries as previously described (De Angelis et al., J. Cell Biol., 147, 869-78, 1999).
- PVP-free polycarbonate filters with 8 ⁇ m pores were coated with 5 ⁇ g/ml porcine skin gelatin (Sigma).
- Serum-free RPMI negative control
- RPMI containing 10, 50 or 100 ng/ml HMGBl and RPMI with 20% serum (positive control) were placed in the lower chambers.
- D16 cells were grown in RPMI plus 10% FCS, starved overnight, washed twice with PBS to eliminate any floating cells, and harvested with trypsin.
- Fifty thousand cells rsuspended in 200 ⁇ l RPMI were placed in the upper chambers and incubated at 37°C in 5% CO 2 for 16 h.
- BAEC cells were grown in DMEM plus 10% FCS on polycarbonate transwell inserts (3 ⁇ m pores; Costar) for 5 days until they formed a monolayer. The inserts were then placed between chambers in Boyden apparatuses, and the tightness of monolayers was checked by measuring the diffusion of BSA between chambers.
- Mesoangioblasts (10 5 cells in 100 ⁇ l RPMI) were placed in the upper compartments and RPMI containing HMGBl or VEGF (mature 121 amino acid variant of human VEGF expressed in E. coli, from R&D Systems) was placed in the lower compartments (500 ⁇ l). After 8 hours at 37°C the filters were removed, and the result was evaluated as described for the chemotaxis assay.
- BAEC cells were grown on glass coverslips until fully confluent. After the treatments described in the text, the cells were washed with PBS and fixed with 4% paraformaldehyde at room temperature for 10 minutes. Cells were then stained with FITC-conjugated phalloidin (Sigma) to visualize the actin cytoskeleton as described (Degryse et al., J. Cell Biol., 152, 1197-2006, 2001).
- Heparin beads (34 ⁇ m diameter) were recovered from a HiTrap Heparin HP column (Pharmacia) and extensively washed in PBS. Beads (20 ⁇ l packed volume) were then incubated for 1 hour at 4°C with 60 ⁇ g HMGBl, harvested by centrifugation, washed twice with PBS and resuspended in PBS. SDS-PAGE was performed to check the amount of HMGBl on the beads. Intra-artery delivery of mesoangioblasts in mice.
- Heparin beads (a slurry containing 3 ⁇ g beads in 20 ⁇ l PBS), either laoded with HMGBl or not, were injected with an insulin syringe into tibialis anterior muscles of 6-week old female CD-I mice (3 per group). After 1 hour mesoangioblasts (4xl0 5 cells/animal) were injected through the femoral artery as previously described (Torrente et al., J. Cell Biol., 152, 335-48, 2001); animals were sacrified 24 hours later. For histochemistry analysis, samples of tibialis anterior muscles were frozen in liquid nitrogen-cooled isopentane and cryostat-sectioned.
- RESULTS HMGBl stimulates the proliferation of vessel-associated embryonic stem cells
- mice Stem cells isolated from mouse dorsal aorta of E9.5 embryos (mesoangioblasts) were cultured in vitro and tested for the presence of the CD34, Kit, Flkl and MEF2D cellular markers (Minasi et al., Development, 129, 2773-2783, 2002). The authors used one of these clones (called D16) to assess whether HMGBl can act as a mitogen.
- D16 cells were seeded in RPMI medium with 20% FCS and then starved for 16 hours in the absence of serum to synchronize the cell population. Increasing concentrations of HMGBl were then added to the medium without serum, and cells were counted after 1, 2, and 3 days.
- Figure 7 A shows that there is a significant increase in the number of D16 mesoangioblasts after stimulation with HMGBl up to day 2, while only slight proliferation occurs between days 2 and 3. All concentrations tested had similar effects.
- HMGBl -stimulated D16 cells had a normal morphology and excluded Trypan blue up to the end of the experiment, whereas cells in control cultures without HMGBl were dying (not shown). HMGBl has no mitogenic effect on 3T3 fibroblasts (Figure 7C).
- HMGBl acts as a growth factor for D16 cells, but is rapidly depleted. HMGBl induces mesoangioblast migration
- HMGBl is a chemoattractant for rat smooth muscle cells (RSMC) (Degryse et al. , J. Cell Biol., 152, 1197-2006, 2001). They then investigated whether HMGBl is a chemoattractant for D16 cells too. In a chemotaxis assay using modified Boyden chambers, HMGBl stimulated migration of D16 cells in a concentration-dependent manner (Fig. 9A). Polyclonal antibodies raised against amino acids 166-181 of HMGBl (anti 166-181, Fig 7 A), significantly reduced the migratory response. However, the migratory response was unaffected by anti-HMGBl monoclonal antibodies that recognize box A.
- RSMC rat smooth muscle cells
- Huttunen et al. (Cancer Res., 62, 4805-4811, 2002) have identified residues 150-183 as the HMGBl segment that interacts with RAGE.
- the anti-HMGBl antibodies that block D16 migration (Fig. 9 A) specifically interact with the amino acid stretch between residues 166 and 181 (Fig. 9C), and therefore occude the RAGE-interacting surface.
- the monoclonal antibodies that recognize box A cannot prevent the interaction with RAGE.
- Our data therefore indicate that HMGBl is a powerful chemoattractant for D16 cells, and suggest that RAGE is its receptor.
- RNA profiling of D16 cells indicate that they express RAGE, and RAGE protein is detectable in D16 cells by Western blot (Fig. 9D).
- HMGBl induces mesoangioblast migration across endothelial monolayers
- Mesoangioblasts are vessel-associated stem cells that can migrate to damaged tissues through the general circulation (Sampaolesi et al., unpublished data), and have the ability to transit through the endothelial barrier. The authors then tested whether HMGBl could also promote the transmigration of stem cells across an endothelial monolayer grown on the septum between the chambers of a Boyden apparatus.
- HMGBl has higher potency than vascular endothelial growth factor (VEGF), a signaling molecules is known to promote cell migration across endothelial barriers.
- VEGF vascular endothelial growth factor
- VEGF induces profound cytoskeletal reorganization of endothelial cells, characterized by the formation of transcytoplasmic stress fibers and the disassembly of adherens junctions, which are important to maintain the endothelial barrier function (Rousseau et al., J. Biol.
- HMGBl directs mesoangioblast homing in vivo
- HMGBl 's ability to control mesoangioblast migration in vivo.
- Heparin beads were loaded with HMGBl at the concentration of 3 ⁇ g/ml and then injected with a fine needle into the tibialis anterior muscle of mice.
- D16 cells transduced by a lentiviral vector causing the expression of nuclear LacZ were injected after 30 min through the proximal femoral artery (see materials and methods). The mice were sacrificed after 24 hours and the tibialis anterior muscle was removed, sectioned, and analyzed by immunohistochemistry.
- Muscles injected with HMGBl -loaded beads showed a considerable swelling compared to both sham- injected muscles (not shown) and muscles injected with unloaded heparin beads (Fig. 11 A), suggesting that HMGBl caused considerable muscle inflammation. This is consistent with HMGB 1 's role as proinflammatory cytokine.
- Muscle sections were stained with X-gal and blue cells were scored using computer- assisted imaging techniques (Fig. 11). Large groups of blue cells were found in the vicinity of HMGBl -loaded beads (panel C); a minority of sections displayed individual blue cells dispersed throughout the muscle (panel D). The sections from muscles injected with unloaded beads had no blue cells at all (panel B).
- Hearts were arrested in diastole at 1 week from the infarction, perfused retrogradely with 10% (vol/vol) formalin, embebbed in paraffin and sectioned at 4 ⁇ m. Sections were stained with hematoxilin and eosin (H&E) for histologic examination or processed for immunoistochemical analysis to identify newly formed cardiac cells.
- H&E hematoxilin and eosin
- the following antibodies were used to assess cardiac differentiation: rabbit polyclonal connexin 43 antibody (Sigma St. Louis, MO, USA), mouse monoclonal anti ⁇ -sarcomeric actin (clone 5C5; Santa Cruz Biotechnology, Santa Cruz, CA, USA), rabbit polyclonal anti-MEF-2 (C-21; Santa Cruz). Ki67 was detected by using mouse monoclonal antibody Ki67 (clone MIB5 Novocastra Laboratories, UK). FITC conjugated goat anti-rabbit and TRITC conjugated goat anti mouse (Sigma) were used as
- Echocardiography was performed in conscious mice with a Sequoia 256c instrument equipped with a 13-MHz linear transducer. Two dimensional images and M-mode tracings were recorded from the parastemal short axis view at the level of papillary muscle. From M-mode tracings, anatomical parameters in diastole and systole were obtained (Orlic et al., Nature, 98, 10344-10349, 2001).
- mice were anesthetized with chloral hydrate (400 mg/kg body weight), the right carotid artery was cannulated with a microtip pressure transducer (Millar 1.4F) and the Left Ventricular pressures (LV, LV+ and - dP/dt), were measured.
- LV, LV+ and - dP/dt the Left Ventricular pressures
- HMGBl promotes the formation of new myocytes in the infarcted heart
- Myocardial infaction was induced in C57BL/6 mice by ligating the left coronary artery (Li et al., J. Clin. Invest., 100, 1991-1999, 1997) under anesthesia. After 4 hrs animals were re-operated and 200 ng of purified HMGBl was administered in the peri-infarcted area in the left ventricle. Control animals consisted of infarcted mice injected with 200 ng of an unrelated protein (GST).
- GST unrelated protein
- HMGBl Injection of HMGBl in the peri-infarcted left ventricle results in the formation of a compact tissue characterized by aligned cells occupying most of the damaged area, as showed by hematoxylin and eosin staining (Fig. 13 A).
- the newly developed tissue extended from the border zone, where it was more compact and organized, to the interior of the injured region.
- GST control protein
- new tissue consisting of aligned cells was never observed.
- connexin connexin
- HMGBl treated heart by analyzing the expression of Ki67, a protein that is present in Gl, S, G2 and early mitosis. Ki67 was expressed in some newly- formed cells, localized inside the infarcted tissue (Fig. 13B). These data demonstrate that HMGBl promotes the formation of new myocytes in the infarcted heart. Myocardial function after infaction is improved by HMGBl
- mice treated with HMGBl showed indices of cardiac failure. In comparison to infacted but untreated mice, however, mice treated with HMGBl showed a significant recovery of cardiac performance.
- HMGBl by inducing cardiomyocytes formation, improved left ventricular performance in the infarcted heart.
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AU2003228099A AU2003228099A1 (en) | 2002-07-03 | 2003-04-29 | Use of hmgb1 in the treatment of tissue damage and/or to promote tissue repair |
US10/519,427 US20060035851A1 (en) | 2002-07-03 | 2003-04-29 | Use of hmgb1 in the treatment of tissue damage and or to promote tissue repair |
JP2004519162A JP2005537253A (en) | 2002-07-03 | 2003-04-29 | Use of HMGB1 in the treatment of tissue damage and / or to promote tissue repair |
MXPA05000302A MXPA05000302A (en) | 2002-07-03 | 2003-04-29 | Use of hmgb1 in the treatment of tissue damage and/or to promote tissue repair. |
DE60326453T DE60326453D1 (en) | 2002-07-03 | 2003-04-29 | THE USE OF HMGB1 FOR THE TREATMENT OF TISSUE INJURIES AND / OR FOR SUPPORT OF TISSUE RESTORATION |
CA002491321A CA2491321A1 (en) | 2002-07-03 | 2003-04-29 | Use of hmgb1 in the treatment of tissue damage and/or to promote tissue repair |
EP03725585A EP1519957B1 (en) | 2002-07-03 | 2003-04-29 | Use of hmgb1 in the treatment of tissue damage and/or to promote tissue repair |
IL16602204A IL166022A0 (en) | 2002-07-03 | 2004-12-28 | Use of HMGB1 in the treatment of tissue damage and/or to promote tissue repair |
NO20050537A NO20050537L (en) | 2002-07-03 | 2005-02-01 | Use of HMGB1 in the treatment of tissue damage and / or to promote tissue repair |
US11/748,632 US20090069227A9 (en) | 2003-04-29 | 2007-05-15 | Use of HMGB1 to promote stem cell migration and/or proliferation |
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Also Published As
Publication number | Publication date |
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IL166022A0 (en) | 2006-01-15 |
KR20050054907A (en) | 2005-06-10 |
CN1671742A (en) | 2005-09-21 |
ATE424416T1 (en) | 2009-03-15 |
EP1519957B1 (en) | 2009-03-04 |
DE60326453D1 (en) | 2009-04-16 |
RU2005102593A (en) | 2005-10-10 |
NO20050537L (en) | 2005-02-01 |
US20060035851A1 (en) | 2006-02-16 |
CA2491321A1 (en) | 2004-01-15 |
EP1519957A2 (en) | 2005-04-06 |
WO2004004763A3 (en) | 2004-02-26 |
AU2003228099A1 (en) | 2004-01-23 |
MXPA05000302A (en) | 2005-08-19 |
JP2005537253A (en) | 2005-12-08 |
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