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Helping the circulatory system heal itself: manipulating kinin signaling to promote neovascularization Expert Rev. Cardiovasc. Ther. 7(3), 215–219 (2009)
Nicolle Kränkel, PhD Postdoctoral Fellow at the Chair of Experimental Cardiovascular Medicine, Bristol Heart Institute, University of Bristol, Bristol Royal Infirmary, Level 7, Upper Maudlin Street, Bristol BS2 8HW, UK Tel.: +44 117 928 3151
[email protected]
Paolo Madeddu, MD CS FAHA Author for correspondence
Professor, and Chair of Experimental Cardiovascular Medicine, Bristol Heart Institute, University of Bristol, Bristol Royal Infirmary, Level 7, Upper Maudlin Street, Bristol BS2 8HW, UK Tel.: +44 117 928 3904 Fax: +44 117 928 3904
[email protected]
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“The kallikrein–kinin system ... is emerging as a therapeutic target for maintaining vascular function and integrity, as well as promoting the growth of new blood vessels.” Maintaining vessel integrity and mounting a fast revascularization response after an ischemic event represent desirable yet unmet goals in current cardiovascular prevention and therapy. The kallikrein– kinin system (KKS) – originally identified to participate in the control of blood pressure – is emerging as a therapeutic target for maintaining vascular function and integrity, as well as promoting the growth of new blood vessels. The KKS is a complex signaling network, initiated by kinin generation from kininogens through kallikreins. Downstream, kininases process kinins (namely, kallidin and bradykinin) into inactive peptides or kinin metabolites (des-Arg-kallidin, desArg-bradykinin). Both kinins and kinin metabolites exert their effects through distinct receptors, the kinin B2 (B2R) and B1 (B1R) receptors, respectively. Kallikrein can activate the B2R via generation of kinins and also in a kinin-independent, direct way , inducing anti-apoptotic signaling pathways including protein kinase Akt, endothelial nitric oxide (NO) synthase, and glycogen synthase kinase 3 [1–4] . B1R signaling, on the other hand, mainly activates NF-κB (along with the production of inflammatory cytokines and collagen) and p38-MAPK (followed by caspase activation) [5,6] . Nevertheless, both kinin receptors have been shown to be involved in angio genesis, although involvement of the B1R was highly dependent on the pathological circumstances, especially the persistence of inflammation [7–13] . In a recent study, Sanchez de Miguel et al. found the B2R to be essential for bradykinin-induced vessel
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sprouting from cardiac explants, while the B1R was involved only to a minor extent [13] . Furthermore, the authors verified the earlier finding that the B2R is involved in the transmission of VEGF signals, underlining the role of this receptor as a nexus for proangiogenic cellular signaling [13,14] . Viral overexpression of the B2R has therefore been postulated as a rescue strategy in conditions of impaired angiogenesis [15] . Unfortunately, only few data exist on the effects of B2R overexpression in vitro, and its use for the rescue of angiogenesis in models of cardiovascular disease or diabetes – the main target groups for proangiogenic treatment – has not been attempted so far. In light of earlier findings indicating that the bottleneck of proangiogenic signaling is located downstream of the receptor level [16] , it might be necessary to address several steps of the cascade simultaneously, such as providing exogenous NO together with B2R overexpression. Apart from kinin generation, kallikreins can promote vessel growth by kinin-independent mechanisms. Direct activation of the B2R by kallikrein, bypassing kinin generation, has recently been shown [2] . Furthermore, through cleavage of extracellular matrix proteins, as well as activation of other matrix proteases, for example gelatinases, kallikrein might facilitate the detachment of resident mature endothelial cells (ECs) from the matrix, a preceding step to EC migration and subsequent vessel sprouting [17,18] . Cleavage and activation of growth factors, such as HGF and IGF, as well as matrix metalloproteases, which in turn modulate growth factor and cytokine
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activity, might contribute to EC survival and migration [19–24] . Consistent with its aforementioned pleiotropic effects, local overexpression of the human tissue kallikrein gene (KLK1) in ischemic tissues led to faster revascularization via a multitude of mechanisms, the most prominent of which seems to be mediated by the B2R [4,8,25,26] . Concerns regarding the safety of viral gene overexpression for therapeutic purposes in humans have prevented translation of those findings for a long time. However, with the development of safer gene-delivery strategies [27–30] , KLK1 over expression might be considered a therapeutic option in the future. In the meantime, infusion of recombinant kallikrein might represent an alternative [31,32] . Yet, for distinct patient populations, benefit from kallikrein supplementation might be limited. While in Type 1 diabetes adenoviral KLK1 overexpression was able to rescue capillarization and blood flow in ischemic hindlimbs, we previously found that in a Type 2 diabetes model KLK1 improved capillarization but not blood flow recovery [33,34] .
“Unfortunately, only few data exist on the effects of B2R overexpression in vitro, and its use for the rescue of angiogenesis in models of cardiovascular disease or diabetes – the main target groups for proangiogenic treatment – has not been attempted so far.” Subject to enzymatic degradation by angiotensin-converting enzyme (ACE), neutral endopeptidase and carboxypeptidases, kinins have a short half-life in the blood [35] . Modulation of kininase expression and activity has been reported in several vascular pathologies [36–39] . Consequently, inhibition of ACE enhances kinin stability and promotes vascular sprouting in animal models as well as in human cardiovascular patients, partly via the B2R and partly via other mechanisms [13,9,40–42] . Using angio tensin II receptor type 1 knockout mice, Li et al. demonstrated the involvement of both kinin receptors and NO signaling in ACE inhibitor-mediated angiogenesis in hindlimb ischemia [9] . Interestingly, the proangiogenic effect of ACE inhibition was blocked to a greater extent by the B2R antagonist HOE140 than by B1R antagonism [9] . In contrast to limb or myocardial vascularization, studies investigating the effect of ACE inhibition on neovascularization in the eye deliver conflicting results. Ebrahimian et al., directly comparing capillarization in hindlimb and retina in Type 1 diabetic mice, report a positive effect of ACE inhibition in the leg, but a reduction of vessel growth in the eye [43] . In nondiabetic wild-type or angiotensin II receptor type 1-deficient mice, on the other hand, Nagai et al. describe ACE inhibition-mediated vessel growth, albeit via a B2R-independent mechanism. However, B1R involvement was not studied, leaving the authors to speculate on involvement of renin–angiotensin-mediated effects [44] . Fewer studies have been performed to evaluate the benefit of inhibiting neutral endopeptidase, the major bradykinin-degrading enzyme in the heart [45,46] . A proangiogenic effect is indicated by 216
studies reporting faster cancer progression to be associated with increased tumor vascularization under neutral endopeptidase inhibition [47,48] . Again, further studies in relevant models are necessary to understand the therapeutic potential for kininase blockers in vascularization of cardiovascular patients with and without diabetes. Over the last decade, the role of circulating cells in postnatal vascularization has been a field of intense study. Apart from monocytes, which are known to be implicated in the mounting stage of angiogenesis, a small portion of circulating cells consists of immature progenitors, which after homing to ischemic tissue are able to differentiate into cells of the vessel wall, thus contributing to in situ vessel generation (vasculogenesis) [49–52] . The exact definition of those endothelial progenitor cells (EPCs) is still debated and parallel characterization methods result in heterogeneous results. However, it seems clear at the moment that two major populations of proangiogenic cells can be enriched by culturebased methods from the circulation: a rare population of cells, which adheres to collagen fast (within 24 h) and results in a late outgrowth (after 2–3 weeks) of endothelial colonies (termed ‘late EPC’), as well as a larger population, which adhere to fibronectin after 2 days but soon yield colonies (termed ‘early EPC’). The former give rise to endothelial-like cells, while the latter consist mainly of monocytic cells whose proangiogenic effect largely relies on paracrine mechanisms, namely, the secretion of growth factors and cytokines that promote EC survival, proliferation and migration [51,53] . The capacity of kallikrein to activate matrix metallopeptidase (MMP)-9 suggests its implication in EPC release from the bone marrow [54–56] . Indeed, in KLK1-deficient mice, we recently described a reduced number of circulating lin-cKit+ cells, as compared with wild-type controls, associated with a reduced amount of capillary formation in ischemic muscles [57] . Vice versa, adenoviral KLK1 gene delivery promoted capillarization and blowflow recovery in ischemic limbs, as we and others have repeatedly shown [8,10,25,26,32,58,59] . In MMP9-deficient mice, however, KLK1 overexpression was inefficient [57] . The extent and exact mechanisms of MMP9-involvement in kallikrein-induced EPC release are still unresolved at present. Further to their availability in the circulation, the capacity of EPCs to home to ischemic tissue is a prerequisite to their pro angiogenic action. We recently reported that bradykinin can serve as a chemoattractant for circulating EPCs [60] . In this study, B2R-mediated recruitment of proangiogenic, circulating cells to ischemic tissues was crucial to neovascularization [60] . Different cytokine secretion profiles of bradykinin-responsive and -non responsive cells, along with the ubiquitously low number of incorporating donor cells in all study groups, points again towards a paracrine mechanism of EPC-mediated neovessel formation [60] . Furthermore, cultured ‘early EPC’ produced NO – a crucial pro angiogenic factor – upon stimulation with bradykinin. This opens up the possibility of ex vivo modification of a patient’s EPC or bone marrow cells before reinjection – specifically with respect to their secretory activity. KLK1 overexpression in EPCs from cardiovascular patients prior to re-injection may therefore provide Expert Rev. Cardiovasc. Ther. 7(3), (2009)
Manipulating kinin signaling to promote neovascularization
a strategy to exploit and support EPC paracrine action, as well as to overcome limited homing and invasive potential of the patient’s EPCs. Although it has not been studied before, encouraging data exist from a study employing mesenchymal stem cells as vehicles for KLK1 overexpression in a model of kidney healing after acute ischemia/reperfusion [61] . The authors report reduced inflammation and apoptosis along with increased Akt activation and an overall protective effect against ischemia/reperfusion damage [61] . Preliminary data from our own group indeed suggest a higher invasive potential of KLK1-overexpressing cultured early EPCs, as well as increased blood-flow recovery of ischemic hindlimbs, when KLK1-transfected EPCs were transplanted instead of EPCs transfected with empty vector [62] . Another problem to solve for routine application of autologous stem/progenitor cells for vascular regeneration consists of the composition of the transplanted cell population. Although bone marrow cells harbor a high number of stem/progenitor cells with regenerative potential, the majority consists of hematopoietic and mesenchymal stem/progenitor cells, which each might exert their own, perhaps unwanted, effects. As previous studies have shown, transplanted cell function strongly depends on milieu conditions [63,64] , which are usually proinflammatory/profibrotic in cardiovascular patients. The anti-inflammatory and antifibrotic effects of kallikrein would again recommend genetic manipulation of transplanted cells (i.e., KLK1 overexpression). An alternative approach consists of the selection and transplantation of functional effector cells from the background of dysfunctional or unwanted cells. We have shown that it is possible to enrich EPCs and other cells with in vitro proangiogenic effects from total peripheral blood leukocytes by migration towards bradykinin [60] . In vitro, the migrating cells exhibit a more proangiogenic cytokine profile, while non-migrating cells secreted higher amounts of inflammatory cytokines, such as RANTES. Interestingly, enrichment of proangiogenic cells was still possible from the blood of patients within the first 3 days after acute myocardial infarction with functional capacity of the enriched cells comparable to those obtained from healthy controls. By contrast, cells derived from patients with stable angina exhibited a severely reduced capacity to be enriched by bradykinin and the enriched cells did not stimulate in vitro angiogenesis [60] . Although initial data indicate a restriction of the suitability of this function-based cell enrichment method to only a selected patient cohort, it opens up a new strategy to select for References 1
Oeseburg H, Iusuf D, van der Harst P, van Gilst WH, Henning RH, Roks AJ. Bradykinin protects against oxidative stress-induced endothelial cell senescence. Hypertension 53, 417–422 (2009).
2
Chao J, Yin H, Gao L et al. Tissue kallikrein elicits cardioprotection by direct kinin b2 receptor activation independent of kinin formation. Hypertension 52, 715–720 (2008).
3
Yao YY, Yin H, Shen B et al. Tissue kallikrein promotes neovascularization and improves cardiac function by the
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cells with a specific functional response. Further studies will need to investigate this approach in more detail, for example by modulating the type of chemoattractant used or by applying the reverse principle, depleting for cells attracted by antiangiogenic cytokines (e.g., RANTES). However, a lot of work needs to be completed in order to define the most effective population for therapeutic angiogenesis and for finetuning their function. While it seems appealing to use specifically manipulated endogenous cells to target the desirable effect, thereby limiting side-effects, the feasibility of this approach still needs to be determined. Seminal studies have demonstrated a poor longterm persistence of injected cells in the target tissue and systemically injected cells home even less efficiently, mostly being retained in the spleen. Moreover, while ex vivo manipulated cells might possess an improved functional capacity – such as the secretion of growth factors – their targets and actual effectors of angiogenesis (EC) might be unable to respond owing to their own dysfunction. Taken together, the multiple pathways interlinking within the KKS – kinin generation by kallikreins and degradation by kininases, kinin receptor expression and function, and kininindependent actions of kallikrein – offer the possibility of tackling different steps within KKS proangiogenic signaling, rather than just interfering with one point of the cascade. Apart from pharm acological approaches, transgenic options move into the range of feasibility with the development of safer viruses and with the use of endogenous cells as gene carriers. Combined approaches, such as inhibition of kininases together with increasing kinin supply by providing exogenous kallikrein, as well as modulation of B1 versus B2 receptor signaling, need to be tailored specifically for distinct patient cohorts. Finally, selection of functional cell populations as well as ex vivo ‘pampering’ of autologous cells prior to transplantation might help to overcome deficiencies of patient-derived stem cells. Financial & competing interests disclosure
The authors have no relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript. This includes employment, consultancies, honoraria, stock ownership or options, expert testimony, grants or patents received or pending, or royalties. No writing assistance was utilized in the production of this manuscript.
Akt–glycogen synthase kinase-3b pathway. Cardiovasc. Res. 80, 354–364 (2008). 4
Yin H, Chao L, Chao J. Nitric oxide mediates cardiac protection of tissue kallikrein by reducing inflammation and ventricular remodeling after myocardial ischemia/reperfusion. Life Sci. 82, 156–165 (2008).
5
Brechter AB, Persson E, Lundgren I, Lerner UH. Kinin B1 and B2 receptor expression in osteoblasts and fibroblasts is enhanced by interleukin-1 and tumour necrosis
factor-a. Effects dependent on activation of NF-κB and MAP kinases. Bone 43, 72–83 (2008). 6
Medeiros R, Cabrini DA, Ferreira J et al. Bradykinin B1 receptor expression induced by tissue damage in the rat portal vein: a critical role for mitogen-activated protein kinase and nuclear factor-κB signaling pathways. Circ. Res. 94, 1375–1382 (2004).
7
Parenti A, Morbidelli L, Ledda F, Granger HJ, Ziche M. The bradykinin/B1 receptor promotes angiogenesis by up-regulation of
217
Editorial
Kränkel & Madeddu
endogenous FGF-2 in endothelium via the nitric oxide synthase pathway. FASEB J. 15, 1487–1489 (2001). 8
9
10
Emanueli C, Minasi A, Zacheo A et al. Local delivery of human tissue kallikrein gene accelerates spontaneous angiogenesis in mouse model of hindlimb ischemia. Circulation 103, 125–132 (2001). Li P, Kondo T, Numaguchi Y et al. Role of bradykinin, nitric oxide, and angiotensin II type 2 receptor in imidapril-induced angiogenesis. Hypertension 51, 252–258 (2008).
Plendl J, Snyman C, Naidoo S, Sawant S, Mahabeer R, Bhoola KD. Expression of tissue kallikrein and kinin receptors in angiogenic microvascular endothelial cells. Biol. Chem. 381, 1103–1115 (2000).
12
Hu DE, Fan TP. [Leu8]des-Arg9bradykinin inhibits the angiogenic effect of bradykinin and interleukin-1 in rats. Br. J. Pharmacol. 109, 14–17 (1993).
13
Sanchez de Miguel L, Neysari S, Jakob S et al. B2-kinin receptor plays a key role in B1-, angiotensin converting enzyme inhibitor-, and vascular endothelial growth factor-stimulated in vitro angiogenesis in the hypoxic mouse heart. Cardiovasc. Res. 80, 106–113 (2008).
15
16
17
18
20
21
Silvestre JS, Bergaya S, Tamarat R, Duriez M, Boulanger CM, Levy BI. Proangiogenic effect of angiotensin-converting enzyme inhibition is mediated by the bradykinin B(2) receptor pathway. Circ. Res. 89, 678–683 (2001).
11
14
19
Miura S, Matsuo Y, Saku K. Transactivation of KDR/Flk-1 by the B2 receptor induces tube formation in human coronary endothelial cells. Hypertension 41, 1118–1123 (2003). Xia CF, Smith RS Jr, Shen B et al. Postischemic brain injury is exacerbated in mice lacking the kinin B2 receptor. Hypertension 47, 752–761 (2006). Segal MS, Shah R, Afzal A et al. Nitric oxide cytoskeletal-induced alterations reverse the endothelial progenitor cell migratory defect associated with diabetes. Diabetes 55, 102–109 (2006). Obiezu CV, Michael IP, Levesque MA, Diamandis EP. Human kallikrein 4: enzymatic activity, inhibition, and degradation of extracellular matrix proteins. Biol. Chem. 387, 749–759 (2006). Ramani VC, Haun RS. The extracellular matrix protein fibronectin is a substrate for kallikrein 7. Biochem. Biophys. Res. Commun. 369, 1169–1173 (2008).
218
Peek M, Moran P, Mendoza N, Wickramasinghe D, Kirchhofer D. Unusual proteolytic activation of prohepatocyte growth factor by plasma kallikrein and coagulation factor XIa. J. Biol. Chem. 277, 47804–47809 (2002). Mukai S, Fukushima T, Naka D, Tanaka H, Osada Y, Kataoka H. Activation of hepatocyte growth factor activator zymogen (pro-HGFA) by human kallikrein 1-related peptidases. FEBS J. 275, 1003–1017 (2008). Casalino-Matsuda SM, Monzón ME, Forteza RM. Epidermal growth factor receptor activation by epidermal growth factor mediates oxidant-induced goblet cell metaplasia in human airway epithelium. Am. J. Respir. Cell Mol. Biol. 34, 581–591 (2006).
29
Buch PK, Bainbridge JW, Ali RR. AAV-mediated gene therapy for retinal disorders: from mouse to man. Gene Ther. 15, 849–857 (2008).
30
Suzuki R, Takizawa T, Negishi Y, Utoguchi N, Maruyama K. Effective gene delivery with novel liposomal bubbles and ultrasonic destruction technology. Int. J. Pharm. 354, 49–55 (2008).
31
Smith RS Jr, Gao L, Chao L, Chao J. Tissue kallikrein and kinin infusion promotes neovascularization in limb ischemia. Biol. Chem. 389, 725–730 (2008).
32
Yao YY, Yin H, Shen B, Chao L, Chao J. Tissue kallikrein and kinin infusion rescues failing myocardium after myocardial infarction. J. Card. Fail. 13, 588–596 (2007).
33
Emanueli C, Caporali A, Krankel N, Cristofaro B, Van Linthout S, Madeddu P. Type-2 diabetic Lepr(db/db) mice show a defective microvascular phenotype under basal conditions and an impaired response to angiogenesis gene therapy in the setting of limb ischemia. Front. Biosci. 12, 2003–2012 (2007).
22
Geisert RD, Chamberlain CS, Vonnahme KA, Malayer JR, Spicer LJ. Possible role of kallikrein in proteolysis of insulin-like growth factor binding proteins during the oestrous cycle and early pregnancy in pigs. Reproduction 121, 719–728 (2001).
23
Rosenblum G, Meroueh S, Toth M et al. Molecular structures and dynamics of the stepwise activation mechanism of a matrix metalloproteinase zymogen: challenging the cysteine switch dogma. J. Am. Chem. Soc. 129, 13566–13574 (2007).
34
Tschesche H, Michaelis J, Kohnert U, Fedrowitz J, Oberhoff R. Tissue kallikrein effectively activates latent matrix degrading metalloenzymes. Adv. Exp. Med. Biol. 247A, 545–548 (1989).
Emanueli C, Graiani G, Salis MB, Gadau S, Desortes E, Madeddu P. Prophylactic gene therapy with human tissue kallikrein ameliorates limb ischemia recovery in Type 1 diabetic mice. Diabetes 53, 1096–1103 (2004).
35
Emanueli C, Salis MB, Van Linthout S et al. Akt/protein kinase B and endothelial nitric oxide synthase mediate muscular neovascularization induced by tissue kallikrein gene transfer. Circulation 110, 1638–1644 (2004).
Linz W, Wiemer G, Gohlke P, Unger T, Schölkens BA. Contribution of kinins to the cardiovascular actions of angiotensinconverting enzyme inhibitors. Pharmacol. Rev. 47, 25–49 (1995).
36
Fukuhara M, Geary RL, Diz DI et al. Angiotensin-converting enzyme expression in human carotid artery atherosclerosis. Hypertension 35, 353–359 (2000).
37
Diet F, Pratt RE, Berry GJ, Momose N, Gibbons GH, Dzau VJ. Increased accumulation of tissue ACE in human atherosclerotic coronary artery disease. Circulation 94, 2756–2767 (1996).
38
Ohishi M, Ueda M, Rakugi H et al. Enhanced expression of angiotensinconverting enzyme is associated with progression of coronary atherosclerosis in humans. J. Hypertens. 15, 1295–1302 (1997).
39
Rakugi H, Kim DK, Krieger JE, Wang DS, Dzau VJ, Pratt RE. Induction of angiotensin converting enzyme in the neointima after vascular injury. Possible role in restenosis. J. Clin. Invest. 93, 339–346 (1994).
24
25
26
Emanueli C, Salis MB, Stacca T et al. Rescue of impaired angiogenesis in spontaneously hypertensive rats by intramuscular human tissue kallikrein gene transfer. Hypertension 38, 136–141 (2001).
27
Nikol S, Baumgartner I, Van Belle E et al.; TALISMAN 201 investigators. Therapeutic angiogenesis with intramuscular NV1FGF improves amputation-free survival in patients with critical limb ischemia. Mol. Ther. 16, 972–978 (2008).
28
Morille M, Passirani C, Vonarbourg A, Clavreul A, Benoit JP. Progress in developing cationic vectors for non-viral systemic gene therapy against cancer. Biomaterials 29, 3477–3496 (2008).
Expert Rev. Cardiovasc. Ther. 7(3), (2009)
Manipulating kinin signaling to promote neovascularization
40
41
42
43
44
45
46
47
48
Fabre JE, Rivard A, Magner M, Silver M, Isner JM. Tissue inhibition of angiotensinconverting enzyme activity stimulates angiogenesis in vivo. Circulation 99, 3043–3049 (1999). Messadi-Laribi E, Griol-Charhbili V, Gaies E et al. Cardioprotection and kallikrein– kinin system in acute myocardial ischaemia in mice. Clin. Exp. Pharmacol. Physiol. 35, 489–493 (2008). Marcic B, Deddish PA, Jackman HL, Erdös EG. Enhancement of bradykinin and resensitization of its B2 receptor. Hypertension 33, 835–843 (1999). Ebrahimian TG, Tamarat R, Clergue M, Duriez M, Levy BI, Silvestre JS. Dual effect of angiotensin-converting enzyme inhibition on angiogenesis in Type 1 diabetic mice. Arterioscler. Thromb. Vasc. Biol. 25(1), 65–70 (2005). Nagai N, Oike Y, Izumi-Nagai K et al. Suppression of choroidal neovascularization by inhibiting angiotensin-converting enzyme: minimal role of bradykinin. Invest. Ophthalmol. Vis. Sci. 48, 2321–2326 (2007). Kokkonen JO, Kuoppala A, Saarinen J, Lindstedt KA, Kovanen PT. Kallidin- and bradykinin-degrading pathways in human heart: degradation of kallidin by aminopeptidase M-like activity and bradykinin by neutral endopeptidase. Circulation 99, 1984–1990 (1999). Dendorfer A, Wolfrum S, Wellhöner P, Korsman K, Dominiak P. Intravascular and interstitial degradation of bradykinin in isolated perfused rat heart. Br. J. Pharmacol. 122, 1179–1187 (1997). Osman I, Dai J, Mikhail M et al. Loss of neutral endopeptidase and activation of protein kinase B (Akt) is associated with prostate cancer progression. Cancer 107, 2628–2636 (2006). Horiguchi A, Chen DY, Goodman OB Jr et al. Neutral endopeptidase inhibits prostate cancer tumorigenesis by reducing
www.expert-reviews.com
for therapeutic revascularization. Arterioscler. Thromb. Vasc. Biol. DOI: 10.1161/ATVBAHA.108.182139 (2009) (Epub ahead of print).
FGF-2-mediated angiogenesis. Prostate Cancer Prostatic Dis. 11(1), 79–87 (2008). 49
50
Asahara T, Murohara T, Sullivan A et al. Isolation of putative progenitor endothelial cells for angiogenesis. Science 275, 964–967 (1997). Kalka C, Masuda H, Takahashi T et al. Transplantation of ex vivo expanded endothelial progenitor cells for therapeutic neovascularization. Proc. Natl Acad. Sci. USA 97, 3422–3427 (2000).
Editorial
58
Xia CF, Yin H, Yao YY, Borlongan CV, Chao L, Chao J. Kallikrein protects against ischemic stroke by inhibiting apoptosis and inflammation and promoting angiogenesis and neurogenesis. Hum. Gene Ther. 17(2), 206–219 (2006).
59
Bledsoe G, Chao L, Chao J. Kallikrein gene delivery attenuates cardiac remodeling and promotes neovascularization in spontaneously hypertensive rats. Am. J. Physiol. Heart Circ. Physiol. 285(4), H1479–H1488 (2003).
51
Yoder MC, Mead LE, Prater D et al. Redefining endothelial progenitor cells via clonal analysis and hematopoietic stem/ progenitor cell principals. Blood 109, 1801–1809 (2007).
52
Rehman J, Li J, Orschell CM, March KL. Peripheral blood “endothelial progenitor cells” are derived from monocyte/ macrophages and secrete angiogenic growth factors. Circulation 107, 1164–1169 (2003).
60
Kränkel N, Katare RG, Siragusa M et al. Role of kinin B2 receptor signaling in the recruitment of circulating progenitor cells with neovascularization potential. Circ. Res. 103(11), 1335–1343 (2008).
53
Sieveking DP, Buckle A, Celermajer DS, Ng MK. Strikingly different angiogenic properties of endothelial progenitor cell subpopulations: insights from a novel human angiogenesis assay. J. Am. Coll. Cardiol. 51, 660–668 (2008).
61
54
Desrivières S, Lu H, Peyri N, Soria C, Legrand Y, Ménashi S. Activation of the 92 kDa type IV collagenase by tissue kallikrein. J. Cell. Physiol. 157(3), 587–593 (1993).
Hagiwara M, Shen B, Chao L, Chao J. Kallikrein-modified mesenchymal stem cell implantation provides enhanced protection against acute ischemic kidney injury by inhibiting apoptosis and inflammation. Hum. Gene Ther. 19, 807–819 (2008).
62
55
Menashi S, Fridman R, Desrivieres S, Lu H, Legrand Y, Soria C. Regulation of 92-kDa gelatinase B activity in the extracellular matrix by tissue kallikrein. Ann. NY Acad. Sci. 732, 466–468 (1994).
Spinetti G, Kraenkel N, Fortunato O, Madeddu PR. Human tissue kallikrein overexpression confers upon human endothelial progenitor cells enhanced invasive and pro-angiogenic activity. Circulation 118, S_479 (2008).
63
Hollemann D, Budka H, Löscher WN, Yanagida G, Fischer MB, Wanschitz JV. Endothelial and myogenic differentiation of hematopoietic progenitor cells in inflammatory myopathies. J. Neuropathol. Exp. Neurol. 67, 711–719 (2008).
64
Seita J, Asakawa M, Ooehara J et al. Interleukin-27 directly induces differentiation in hematopoietic stem cells. Blood 111, 1903–1912 (2008).
56
57
Heissig B, Hattori K, Dias S et al. Recruitment of stem and progenitor cells from the bone marrow niche requires MMP-9 mediated release of kit-ligand. Cell 109(5), 625–637 (2002). Stone OA, Richer C, Emanueli C et al. Critical role of tissue kallikrein in vessel formation and maturation – implications
219