Hypoxia, BNip3 Proteins, and the Mitochondrial Death Pathway in Cardiomyocytes
2002; Lippincott Williams & Wilkins; Volume: 91; Issue: 3 Linguagem: Inglês
10.1161/01.res.0000030195.38795.cf
ISSN1524-4571
Autores Tópico(s)ATP Synthase and ATPases Research
ResumoHomeCirculation ResearchVol. 91, No. 3Hypoxia, BNip3 Proteins, and the Mitochondrial Death Pathway in Cardiomyocytes Free AccessEditorialPDF/EPUBAboutView PDFView EPUBSections ToolsAdd to favoritesDownload citationsTrack citationsPermissions ShareShare onFacebookTwitterLinked InMendeleyReddit Jump toFree AccessEditorialPDF/EPUBHypoxia, BNip3 Proteins, and the Mitochondrial Death Pathway in Cardiomyocytes Michael T. Crow Michael T. CrowMichael T. Crow From the Department of Medicine, Johns Hopkins University, Baltimore, Md. Originally published9 Aug 2002https://doi.org/10.1161/01.RES.0000030195.38795.CFCirculation Research. 2002;91:183–185Myocyte cell loss is a prominent and important pathogenic feature of cardiac ischemia. Limiting this loss is a desirable therapeutic goal, but the development of truly effective strategies to achieve that goal requires an understanding of the mechanisms by which ischemia triggers cell death. Investigators have turned to isolated and cultured cardiomyocytes to identify signaling pathways involved in the response to ischemia and to systematically test the effectiveness of prosurvival signaling pathways and various antideath molecules against ischemia-associated cellular insults, such as hypoxia.1–4 Despite some success in this area, it is still not totally clear how hypoxia actually triggers cell death in cardiomyocytes.One attractive mechanism through which hypoxia might trigger cardiomyocyte cell death is explored by Regula and coworkers5 in this issue of Circulation Research. These investigators present data on the possible role of BNip3, a hypoxia-inducible member of the Bcl-2 family of apoptotic regulators, in mediating cardiomyocyte cell death. They show that (1) BNip3 expression is dramatically increased in response to hypoxia, (2) enforced expression of BNip3 causes cell death in normoxic cardiomyocytes, and (3) enforced expression of a BNip3 mutant lacking its transmembrane domain (BNip3ΔTM) partially blocks hypoxia-induced cell death. BNip3 is an attractive candidate to play a pivotal role in the cellular response to hypoxia because (1) its expression is regulated by the hypoxia-inducible factor (HIF) transcription complex, the activation of which by hypoxia is a well-characterized response, (2) its activity is tied to the Bcl-2 family of apoptosis regulators, and (3) it is localized to the mitochondria, a site where numerous cell death regulatory pathways converge. In addition, the BNip3-related protein, Nix/BNip3L, has recently been shown to play an important role in the transition from compensatory hypertrophy to heart failure in the Gαq-overexpressing transgenic mouse.6BNip3 stands for Bcl-2 and nineteen-kilodalton interacting protein-37 and is a member of the Bcl-2 protein family. Bcl-2 proteins have been implicated in the control of both apoptotic and necrotic cell death and in guarding mitochondrial integrity. They share up to 4 conserved regions of homology known as Bcl-2 homology domains (BH1, BH2, BH3, and BH4), which mediate interactions among the various family members, and are divided functionally into antiapoptotic and proapoptotic members (see Figure, panel A). Many of these proteins normally reside in membranous cellular structures, including mitochondria, endoplasmic reticulum, and the nuclear envelope or are recruited to such structures (principally the mitochondria) during the execution of cell death signaling pathways. Antiapoptotic members, such as Bcl-2, Bcl-XL, Mcl-1, A1, Bcl-W, display sequence homology throughout all 4 BH domains. Proapoptotic members, which antagonize the activity of many prosurvival proteins and induce cell death when overexpressed, display homology to fewer BH domains. Some, like Bax and Bak, contain BH1, BH2, and BH3 domains, whereas many others (Bad, Bid, Bik, Bim, BimL, Blk, and Noxa) possess only the BH3 domain (BH3-only proteins). Download figureDownload PowerPointA, Organization of the Bcl-2 family of cell death regulatory proteins. B, Possible signaling pathways activated in hypoxia-induced cell death of cardiomyocytes.By themselves, BH3-only proteins do not induce cell death, but instead act as allosteric activators of the multidomain proapoptotic proteins Bax and Bak, such that there is an absolute requirement for Bax or Bak.8 These proteins, therefore, function at the judicial rather than executioner stage of cell death, integrating information on the survival status and cellular stresses imposed from within and outside the cell, with their proapoptotic-promoting activity normally held in check by posttranslational mechanisms.9 Thus, activation of cytosolic Bid is initiated by caspase 8 cleavage, followed by its translocation to mitochondria and activation of Bak and Bax. A similar mechanism for Bax involving calpain has also been proposed. Other BH3-only proteins, such as Bad, are actively sequestered away from mitochondria through phosphorylation mediated by Akt/PKB, a prominent prosurvival signaling kinase.BNip3 is the founding member of a small group of BH3-only proteins that includes BNip3, Nix/BNip3L, and BNip3H.10 In contrast to Bid and Bad, the proapoptotic activity of BNip3 and Nix is regulated through transcriptional mechanisms that involve the HIF complex. Thus, the promoter for BNip3 contains a functional binding site for the HIF transcriptional complex (hypoxia response element, HRE) and its mRNA and protein expression are dramatically increased in multiple cell types in response to reduced oxygen concentration.11 In cultured cells, increased expression of BNip3 appears to be part of a second wave of hypoxia-induced protein accumulation, occurring late relative to other well-characterized HIF-inducible genes that are involved in promoting angiogenesis, glycolytic metabolism, and survival (eg, erythropoietin, VEGF, heme oxygenase, hexokinase, and IGF2).12The study by Regula et al5 extends previous observations on the expression and ability of BNip3 to induce cell death11,13 to isolated cardiomyocytes. Although they confirm an earlier report14 that induction of BNip3 in isolated cardiomyocytes occurs in response to hypoxia, they also show that elevated BNip3 protein levels are seen in vivo in animal models of acute ischemia and heart failure. Induction of protein expression is acute, ischemia is rapid (1 hour), and in heart failure, persistent (up to 8 weeks). The rapid accumulation during in vivo suggests that other components of the response may potentiate the transcriptional response to hypoxia or facilitate protein accumulation. Interestingly, expression of another HIF-inducible member of the BNip3 family, Nix/BNip3L, has been shown to be upregulated during cardiac hypertrophy triggered by overexpression of Gαq, a signaling intermediate for numerous hypertrophic stimulants.6 Together, these recent studies suggest that expression of BNip3 proteins, which apparently can be governed by stress-inducing factors in addition to hypoxia, is likely to be an important contributor not only to the pathogenesis of ischemic diseases but other cardiac disorders as well. A recent study in Circulation Research14a showed that the BNip2 protein, Nip21, is involved in cell death associated with experimentally induced myocarditis. Although it shares limited homology to BNip3, this protein also interacts with Bcl-2 proteins and E1B 19-kDa protein to regulate mitochondrial death pathways.To assess the functional significance of BNip3 expression in hypoxia-mediated cell death, Regula et al5 used a modified BNip3 protein lacking its transmembrane domain (BNip3ΔTM) as a potential dominant-negative mutant. The effectiveness of the mutant was established by showing that its expression blocked the stable (alkali-insensitive) incorporation of BNip3 into mitochondria (presumably BNip3ΔTM heterodimerizes with endogenous BNip3). Expression of this mutant alone had no effect on cell death, but it blocked approximately half of the total cell death (measured as loss of plasma membrane integrity) induced by hypoxia.If BNip3ΔTM effectively sequesters BNip3 away from mitochondria, why doesn't it completely block hypoxia-induced cell death? One possibility is that BNip3 has death-inducing effects that do not involve its direct association with mitochondria and therefore would not be expected to be inhibited by BNip3ΔTM. This notion is supported by laboratory-generated mutants of BNip3 that are redirected to extramitochondrial sites, yet still cause substantial cell death.15 Although further work is needed to characterize the mode of death at these extramitochondrial sites, the ultimate reconciliation of this issue might require completely removing BNip3 from the response to hypoxia, using either myocytes from BNip3 knockout mice (when and if they become available) or antisense technology to suppress BNip3 mRNA accumulation.Another possibility for the partial effect of the BNip3ΔTM mutant is that BNip3 does not mediate the entire response to hypoxia. It is likely that expression of Nix is also upregulated during hypoxia. If its activity continues in the presence of the BNip3ΔTM mutant, then it will be necessary to use a specific dominant-negative for Nix (such a mutant in which the TM domain is partially truncated appears to occur naturally and is referred to as sNIX6 (Figure, panel A). There also may be other signaling events to consider. This point and others relating to how BNip3 and Nix might contribute to cell death within the context of other signaling events already described by the Kirshenbaum group is shown in the Figure, panel B. On the basis of the cleavage and increased activity of caspase 8 in response to hypoxia and the ability of the cowpox virus serpin CrmA (a somewhat specific inhibitor of caspase 816) to completely block hypoxia-induced nuclear fragmentation and DNA laddering,4 this group had earlier postulated an essential role for caspase 8 activity in hypoxia-induced cell death. CrmA did not, however, block cytochrome c release caused by hypoxia, although it did prevent dissipation of the mitochondrial membrane potential (ΔΨm), an event often associated with the mitochondrial permeability transition (MPT). Although MPT was not measured in that study,4 it was shown that bongkregic acid, which prevents the MPT, was also effective in preventing hypoxia-induced cell death. Because caspases can directly induce MPT,17 the sequence of intracellular events in response to hypoxia might first entail release of cytochrome c (perhaps mediated by BNip3 or Nix), followed by activation of caspases, and then, as a relatively late event (shown in the Figure, panel B as dashed lines), caspase-induced proteolytic events that trigger the MPT. BNip3 may also play a role here as well, because it has been shown to induce MPT both in the present study and in the literature.12 It is currently unclear how caspase 8 is activated by hypoxia and whether BNip3 proteins play any role in this activation. Finally, if CrmA does not block cytochrome c release, what prevents cytochrome c released in the presence of CrmA from triggering apoptosome formation and the activation of caspase 9, followed by activation of downstream caspases and nuclear fragmentation (gray lines in Figure 1B)? In this regard, it has been reported that cardiomyocytes can tolerate cytochrome c release without manifesting morphological evidence of cell death.18To adequately reconcile the events linked to hypoxia-mediated cell death in cardiomyocytes, a detailed time course of the cleavage and activation for the various caspases already implicated in the response to hypoxia (caspases 3, 8, and 9) needs to be performed. This will determine when and possibly how caspase 8 is activated. These events should also be tied to events in the mitochondria and to the effects of various inhibitors of the processes (ie, CrmA, BNip3ΔTM, Bcl-XL, Nix). It is also important to determine what role both BNip3 and Nix are playing in promoting cell death at both mitochondrial and extramitochondrial sites in the cell and whether dominant-negative mutants of each protein can neutralize the effects of the other. By using these dominant-negative mutants, it should de determined whether BNip3 or Nix causes cytochrome c release and/or whether it affects caspase 8 activation/activity. Existing gene knockout mice should be used to determine the dependency of BNip3 and Nix-mediated cell death on Bax and Bak to induce cell death (Bax−/−/Bak−/− mice) and on the role of HIF in BNip3 and Nix expression during cardiac hypertrophy in vivo and the transition to heart failure (HIF-1α−/− mice). Given the remarkable induction of BNip3 by hypoxia in cultured cells and in in vivo models of cardiac ischemic disease along with recent data showing that Nix/BNip3L is involved in the progression to heart failure in the Gαq-overexpressing mouse, the answers to these questions will be eagerly awaited.The opinions expressed in this editorial are not necessarily those of the editors or of the American Heart Association.FootnotesCorrespondence to Michael T. Crow, PhD, Johns Hopkins University, Department of Medicine, Division of Pulmonary Medicine, JHAAC, 5501 Hopkins Bayview Cir, Baltimore, MD 21224. E-mail [email protected] References 1 Chesley A, Lundberg MS, Asai T, Ohtani S, Xiao RP, Lakatta EG, Crow MT. The β2-adrenergic receptor delivers an antiapoptotic signal to cardiac myocytes through Gi-dependent coupling to phosphatidylinositol 3′-kinase. Circ Res. 2000; 87: 1172–1179.CrossrefMedlineGoogle Scholar2 Matsui T, Li L, del Monte F, Fukui Y, Franke TF, Hajjar RJ, Rosenzweig A. 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Mitochondrial death protein Nix is induced in cardiac hypertrophy and triggers apoptotic cardiomyopathy. Nat Med. 2002; 8: 725–730.CrossrefMedlineGoogle Scholar7 Boyd JM, Malstrom S, Subramanian T, Venkatesh LK, Schaeper U, Elangovan B, D'Sa-Eipper C, Chinnadurai G. Adenovirus EIB 19 kDa and Bcl-2 proteins interact with a common set of cellular proteins. Cell. 1994; 79: 341–351.CrossrefMedlineGoogle Scholar8 Zong WX, Lindsten T, Ross AJ, MacGregor GA, Thompson CB. BH3-only proteins that bind pro-survival Bcl-2 family members fail to induce apoptosis in the absence of Bax and Bak. Genes Dev. 2001; 15: 1481–1486.CrossrefMedlineGoogle Scholar9 Antonsson B. Bax and other pro-apoptotic Bcl-2 family "killer-proteins" and their victim, the mitochondrion. Cell Tissue Res. 2001; 306: 347–361.CrossrefMedlineGoogle Scholar10 Yasuda M, Theodorakis P, Subramanian T, Chinnadurai G. Adenovirus E1B-19K/BCL-2 interacting protein BNIP3 contains a BH3 domain and a mitochondrial targeting sequence. J Biol Chem. 1998; 273: 12415–12421.CrossrefMedlineGoogle Scholar11 Bruick RK. Expression of the gene encoding the proapoptotic Nip3 protein is induced by hypoxia. Proc Natl Acad Sci U S A. 2000; 97: 9082–9087.CrossrefMedlineGoogle Scholar12 Semenza GL. Hypoxia-inducible factor 1: oxygen homeostasis and disease pathophysiology. Trends Mol Med. 2001; 7: 345–350.CrossrefMedlineGoogle Scholar13 Vande Velde C, Cizeau J, Dubik D, Alimonti J, Brown T, Israels S, Hakem R, Greenberg AH. BNIP3 and genetic control of necrosis-like cell death through the mitochondrial permeability transition pore. Mol Cell Biol. 2000; 20: 5454–5468.CrossrefMedlineGoogle Scholar14 Guo K, Searfoss G, Krolikowski D, Pagnoni M, Franks C, Clark K, Yu KT, Jaye M, Ivashchenko Y. Hypoxia induces the expression of the pro-apoptotic gene BNIP3. Cell Death Differ. 2001; 8: 367–376.CrossrefMedlineGoogle Scholar14A Zhang HM, Yanagawa B, Cheung P, Luo H, Yuan J, Chau D, Wang A, Bohunek L, Wilson JE, McManus BM, Yang D. Nip21 gene expression reduces coxsackievirus B3 replication by promoting apoptotic cell death via a mitochondria-dependent pathway. Circ Res. 2002; 90: 1251–1258.LinkGoogle Scholar15 Ray R, Chen G, Vande Velde C, Cizeau J, Park JH, Reed JC, Geitz RD, Greenberg AH. BNIP3 heterodimerizes with Bcl-2/Bcl-XL and induces cell death independent of a Bcl-2 homology 3 (BH3) domain at both mitochondrial and nonmitochondrial sites. J Biol Chem. 2000; 275: 1439–1448.CrossrefMedlineGoogle Scholar16 Ryan CA, Stennicke HR, Nava VE, Burch JB, Hardwick JM, Salvasen GS. Inhibitor specificity of recombinant and endogenous caspase 9. Biochem J. June 14, 2002; 10.1042/BJ20020863. Available at: http://www.biochemj.org. Accessed July 10, 2002.Google Scholar17 Marzo I, Brenner C, Zamzami N, Susin S, Beutner G, Brdiczka D, Remy R, Xie ZH, Reed JC, Kroemer G. The permeability transition pore complex: a target for apoptosis regulation by caspases and Bcl-2-related proteins. 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