Extracellular annexins in hemostasis system

Annexins are calcium-binding proteins that interact with cellular membranes due to their ability to bind phospholipids. The structural and functional peculiarities of these proteins have been described. Being cytosolic proteins, annexins also possess extracellular activities. However, there are some...

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Date:2016
Main Authors: Zhernossekov, D.D., Roka-Moiia, Y.M., Grinenko, T.V.
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Published: Інститут молекулярної біології і генетики НАН України 2016
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Cite this:Extracellular annexins in hemostasis system / D.D. Zhernossekov, Y.M. Roka-Moiia, T.V. Grinenko // Вiopolymers and Cell. — 2016. — Т. 32, № 2. — С. 98-104. — Бібліогр.: 52 назв. — англ.

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spelling irk-123456789-1528162019-06-14T01:26:20Z Extracellular annexins in hemostasis system Zhernossekov, D.D. Roka-Moiia, Y.M. Grinenko, T.V. Reviews Annexins are calcium-binding proteins that interact with cellular membranes due to their ability to bind phospholipids. The structural and functional peculiarities of these proteins have been described. Being cytosolic proteins, annexins also possess extracellular activities. However, there are some controversial opinions concerning the functional role of extracellular annexins in the human hemostasis system. We have made an attempt to summarize the latest data and consider some ideas of possible annexin application in medical practice. Анексини – це кальцій-залежні протеїни, що взаємодіють з клітинними мембранами завдяки їх властивості зв’язувати фосфоліпіди. Структурно-функціональні особливості цих протеїнів надані в науковій літературі. Хоча анексини – цитозольні протеїни, для них притаманна позаклітинна активність. Існують суперечливі дані стосовно ролі позаклітинних анексинів у системі гемостазу. Ми спробували систематизувати сучасні наукові дані та виявити можливе застосування анексинів у медичній практиці. Аннексины – это кальций-зависимые протеины, взаимодействующие с клеточными мембранами благодаря их способности связывать фосфолипиды. Структурно-функциональные особенности этих белков описаны в научной литературе. Хотя аннексины – цитозольные протеины, для них показана внеклеточная активность. Существуют противоречивые мнения касательно функциональной роли внеклдеточных аннексинов в системе гемостаза. Мы предприняли попытку систематизировать последние научные данные и рассмотреть возможное применение аннексинов в медицинской практике. 2016 Article Extracellular annexins in hemostasis system / D.D. Zhernossekov, Y.M. Roka-Moiia, T.V. Grinenko // Вiopolymers and Cell. — 2016. — Т. 32, № 2. — С. 98-104. — Бібліогр.: 52 назв. — англ. 0233-7657 DOI: http://dx.doi.org/10.7124/bc.000911 http://dspace.nbuv.gov.ua/handle/123456789/152816 576. 522: 612.128 en Вiopolymers and Cell Інститут молекулярної біології і генетики НАН України
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
language English
topic Reviews
Reviews
spellingShingle Reviews
Reviews
Zhernossekov, D.D.
Roka-Moiia, Y.M.
Grinenko, T.V.
Extracellular annexins in hemostasis system
Вiopolymers and Cell
description Annexins are calcium-binding proteins that interact with cellular membranes due to their ability to bind phospholipids. The structural and functional peculiarities of these proteins have been described. Being cytosolic proteins, annexins also possess extracellular activities. However, there are some controversial opinions concerning the functional role of extracellular annexins in the human hemostasis system. We have made an attempt to summarize the latest data and consider some ideas of possible annexin application in medical practice.
format Article
author Zhernossekov, D.D.
Roka-Moiia, Y.M.
Grinenko, T.V.
author_facet Zhernossekov, D.D.
Roka-Moiia, Y.M.
Grinenko, T.V.
author_sort Zhernossekov, D.D.
title Extracellular annexins in hemostasis system
title_short Extracellular annexins in hemostasis system
title_full Extracellular annexins in hemostasis system
title_fullStr Extracellular annexins in hemostasis system
title_full_unstemmed Extracellular annexins in hemostasis system
title_sort extracellular annexins in hemostasis system
publisher Інститут молекулярної біології і генетики НАН України
publishDate 2016
topic_facet Reviews
url http://dspace.nbuv.gov.ua/handle/123456789/152816
citation_txt Extracellular annexins in hemostasis system / D.D. Zhernossekov, Y.M. Roka-Moiia, T.V. Grinenko // Вiopolymers and Cell. — 2016. — Т. 32, № 2. — С. 98-104. — Бібліогр.: 52 назв. — англ.
series Вiopolymers and Cell
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fulltext 98 D. D. Zhernossekov, Y. M. Roka-Moiia, T. V. Grinenko © 2016 D. D. Zhernossekov et al.; Published by the Institute of Molecular Biology and Genetics, NAS of Ukraine on behalf of Biopolymers and Cell. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited UDC 576. 522: 612.128 Extracellular annexins in hemostasis system D. D. Zhernossekov, Y. M. Roka-Moiia, T. V. Grinenko Palladin Institute of Biochemistry, NAS of Ukraine 9, Leontovycha Str., Kyiv, Ukraine, 01601 chemikdd@mail.ru Annexins are calcium-binding proteins that interact with cellular membranes due to their ability to bind phos- pholipids. The structural and functional peculiarities of these proteins have been described. Being cytosolic proteins, annexins also possess extracellular activities. However, there are some controversial opinions con- cerning the functional role of extracellular annexins in the human hemostasis system. We have made an at- tempt to summarize the latest data and consider some ideas of possible annexin application in medical practice. K e y w o r d s: annexins, hemostasis, plasminogen/plasmin system. Annexins are considered as a family of calcium-de- pendent phospholipid-binding proteins. The struc- ture of these proteins has some common features [1] (Fig.1). As a rule, annexins possess a variable ami- no-terminal domain and a carboxyl core domain. The last one is typically divided into four homolo- gous domains (each of them is about 70 amino acid residues) and each of these domains consists of five α-helices. The amino-terminal domain contains sites for posttranslational modification and protein-pro- tein interaction. It has to be noted that this domain provides the stability of the whole protein struc- ture [2]. Posttranslational modifications in this re- gion such as phosphorylation, acetylation or proteo- lysis make influence on the structure of key regions of the protein core even though they take place at the opposite side of the annexin molecule. The carboxyl core domain houses one or several calcium-binding motives (KGXGT-38 residues-D/E). Apart from the calcium-binding sites, in this domain there are also the sites for binding to heparin, F-actin and phospho- lipids (such as phosphatidyl serine and phosphati- dylethanolamine). The annexins have been shown to take part in many processes: exocytosis, endocyto- sis, inhibition of blood coagulation, regulation of ion transport across membranes, membrane reorganiza- tion, vascular trafficking and redox regulation [3, 4]. In this review we mostly paid attention to those members of annexin family that can be found in the human hemostasis system. Normally annexins are not secreted from the living cells, and the appear- ance of these proteins in bloodstream can be con- side red as a result of the cell degradation or apopto- sis [5]. It is known that annexins lack the signal se- quences that could direct them into the classical se- cretory pathway. However, for annexins A1, A2 and A5 the extracellular activity has been shown. Thus, annexin A5 is considered as an anticoagulant pro- tein, annexin A2 as an endothelial receptor for plas- minogen and tissue plasminogen activator (tPA), and annexin A1 as an anti-inflammatory agent [6]. Annexin A1 and its role in inflammation Annexin A1 has the longest history of reported ex- tracellular activity. It was found in human serum at some pathological states such as myocardial infarc- tion and experimental colitis [7,8]. The role of an- nexin A1 in inflammation is related with glucocorti- ISSN 1993-6842 (on-line); ISSN 0233-7657 (print) Biopolymers and Cell. 2016. Vol. 32. N 2. P 98–104 doi: http://dx.doi.org/10.7124/bc.000911 mailto:chemikdd@mail.ru 99 Extracellular annexins in hemostasis system coids as the main mechanism of glucocorticoids’ anti-inflammatory effects is an increase of the syn- thesis and function of annexin A1 [9]. Glucocorticoids bind to the cytosolic glucocorticoid receptor, a type of nuclear receptor that is activated by the ligand binding. After the hormone binds to the receptor, the newly formed complex translocates itself into the cell nucleus, where it binds to the glucocorticoid re- sponse elements in the promoter region of annexin A1 gene resulting in stimulation of the gene expres- sion [10]. Annexin A1 inhibits phospholipase A2. This is a calcium-dependent enzyme acting on phos- pholipids of membranes that releases arachidonic acid from the second carbon group of glycerol. Arachidonic acid is a precursor of prostaglandins and leucotriens playing the key role in the inflamma- tory reactions. On the other hand, annexin A1 may be considered as a regulator of leukocyte migration [11, 12]. As it is known, there are specific A1 recep- tors on the human neutrophils and monocytes [13]. They belong to the formyl peptide receptor (FRP) family of chemoattractant receptors. FRPs are the G-protein-coupled receptors, and they were identi- fied by their ability to bind N-formyl peptides con- taining an N-terminal N-formylmethionine produced by the degradation of either bacterial or host cells (they can be released by the mitochondria). The for- myl peptide receptor (FPR) signaling pathways in- clude the following steps: G-protein dependent acti- vation of phospholipase C, activation of the regula- tory small GTP-ase, and activation of CD38, ectoen- zyme of the membrane surface. The final result of the process is an increase in the cytoplasmic Ca2+ level. The sustained increase of calcium is required for directed migration of the cells [14]. The sequenc- es located in the unique N-terminal domain of an- nexin A1 specifically interact with the formyl pep- tide receptor on neutrophils, thereby eliciting the receptor-mediated intracellular responses leading to the inhibition of transendothelial migration. Annexin A2 as a receptor on leukocytes and endothelial cells Annexin A2 found on the surface of endothelial cells and leukocytes can function as a receptor for plas- minogen and tPA acting as a positive modulator of the fibrinolytic cascade. The increased expression of annexin A2 on the surface of leukemic cells derived from the acute promyelocytic leukemia patients cor- relates with the clinical manifestation of blee- ding [15]. Endothelial cells are thought to play a key role in the intravascular plasmin generation, as they syn- thetize and secrete plasminogen activators (tPA and uPA) and their inhibitors (PAI-1) [16]. It is remark- able that on endothelial cells, annexin A2 is consti- tutively translocated to the cell surface within 16 hours of its biosynthesis where it may consist 5 % of the cellular protein pool [17]. Exogenous I125 –labeled annexin A2 bound to endothelial cell sur- face with high affinity (Kd 49nM) in a calcium-de- pendent manner. This binding may be blocked by Fig. 1. Schematic representation of an- nexin structure: ‒ calcium binding motive, ‒ binding protein, ‒ phosphate group. 100 D. D. Zhernossekov, Y. M. Roka-Moiia, T. V. Grinenko peptides mimicking the classical “annexin repeat” (KGXGT) [16]. Annexin A2 is thought to be a major membrane re- ceptor of tPA on endothelium [18]. It has been shown that tPA, plasminogen and plasmin bind to annexin A2 through protein p11 with different affinity (Kd 0.68 µM, 0.11 µM and 75 nM respectively) [19]. There is a tight hydrophobic interaction between p11 and annexin A2. Complex p11-annexin A2 binds tPA, plasmin and plasminogen due to the C-terminal lysine residue of the p11 molecule [1]. The formed complex can provide generation of the extracellular plasmin (plasminogen is converted into plasmin by cleaving peptide bond between Arg 561 and Val 562 by tPA) [20]. However, the proposed profibrinolytic function of annexin A2 is somewhat controversial, as there are the data, that annexin A2 in complex with p11 can also inhibit the plasmin activity and fibrinolysis [21]. Recently, it has been demonstrated that the tPA - annexin A2 interaction may play a significant role during inflammation process (Fig.2). Under the stimulation of tPA, annexin A2 aggre- gates with β-2 integrin CD 11b, leading to the activa- tion of integrin-linked kinase (ILK) pathway [22]. Thus, annexin A2 can transduce tPA signaling through its interaction with integrins. Annexin A2 mediates tPA-induced NF-kB activation in macro- phages. In physiological status, the members of NF- kB family (p50, p52, p65 and other) are retained in the cytoplasm by the specific inhibitor IkB. Upon activation, IkB becomes phosphorylated, which leads to its degradation and the release of NF-kB di- mers into nuclei. It results in the subsequent DNA binding and transcription of the target proinflamma- tory genes. Blocking any step of this cascade (e.g. using annexin A2 antibodies) eliminates the tPA-in- duced NF-kB activation. Annexin A5 as an anticoagulant factor and apoptosis marker Annexin A5 was originally isolated from the human umbilical cord artery by virtue of its anticoagulant ac- Fig. 2. tPA-induced NF kB activation in human macrophages: ann A2 – annexin A2, Plg – plasminogen, Pm – plasmin, tPA – tissue plasminogen activator, ILK – integrin linked kinase, Pi – phosphate group. 101 Extracellular annexins in hemostasis system tivity [23]. As it was mentioned above, all calcium- binding annexins are thought to be natural anticoagu- lants. It is known that the phosphatidyl serine (PS) exposure on the outer membrane is the characteristic of the activated platelets or endothelial cells [24]. PS facilitates the assembly and activation of the tenase and prothrombinase complexes [25]. The annexin A5 binding to PS results in formation of an anticoagulant shield on the cell membrane [5].This shield is of great importance for placental cells as annexin A5 binds to the apical surface of placental syncytiotrophoblasts providing maintenance of normal blood flow through the placenta. The disruption of the shield leads to the development of antiphospholipid syndrome. As a re- sult the apical surface of placenta becomes thrombo- genic and patients with antiphospholipid syndrome suffer from recurrent pregnancy losses [26]. It has also been shown that extracellular as well as cytosolic annexin A5 binds to the disrupted site of injured plas- ma membrane as early as a few seconds after mem- brane wounding and promotes membrane resealing [27]. All these data raise the question of a role of an- nexin A5 in the protection and repair of membrane injuries in trophoblasts. On the other hand, annexin A5 is the main annexin of human platelets [28]. Annexin A5 binds to platelets with high affinity (Kd 7nM) [29]. It was found that each platelet has approximately 5,000 sites to bind an- nexin A5. After thrombin stimulation, the amount of annexin-binding sites per platelet can reach 200,000. The treatment with phospholipase C or adding phos- pholipase preparations to the platelet mixture led to inhibition of annexin A5 binding [30]. Annexin A5 is also exposed on the apoptotic platelets [31]. During platelet apoptosis, the PS exposure occurs via the cas- pase and calpain activation, when platelets undergo a cellular death pathway leading to their clearance from the circulation by scavenger cells [32]. These events could be also induced in vitro by thrombin. It is re- markable, that the aging and stored platelets were also positive for PS [33]. However, it is necessary to carry out the analysis of other biomarkers to distinguish the platelet activation and apoptosis-mediated changes from each other [34]. So, annexin A5 can serve as a marker of activated or apoptotic platelets and its determination in blood and on the surface of blood cells or endothelium can be very important for the diagnosis and treatment of hemostasis disorders [35]. Annexin A5 effect on plasminogen binding In the presence of apoptotic factors, plasminogen considerably increases phosphatidyl serine exposure. This effect was shown for monocytes and neutro- phils. The increased exposure of phosphatidyl serine is associated with the growing plasminogen binding to the cell surface [36]. This effect is explained by the histone H2B exposure on the surface of apoptotic monocytes. Histone H2B has different binding sites for phosphatidyl serine and plasminogen and can provide the efficient binding of both components with the cell surface. Annexin A5 competes with his- tone H2B for phosphatidyl serine binding and as a result plasminogen binding to cells is inhibited. On the other hand, the platelet activation with thrombin led to an increased exposure of phosphati- dyl serine in case of platelets and, as a result, eleva- ted plasminogen binding was observed on the plate- let surface [37]. The phosphatidyl serine exposure in these experiments was detected using annexin A5. It was found a special place on the platelet surface, so- called protruding “cap”, where plasminogen [37], thrombospondin and fibrinogen/fibrin were coloca- lized [38]. As this “cap” was also the localization place for factor XIIIa [39], it was suggested that fib- rin plays a special role in amplifying the plasmino- gen binding to annexin A5 bound platelets [37]. However, we could also observe the plasminogen effect on the annexin A5 binding in case of activated platelets [40]. In our experiments the exogenous plasminogen preincubated with washed human platelets leads to the increased exposure of annexin A5 on the platelet surface after the thrombin stimula- tion. As there are no data about the formation of an- nexin A5-plasminogen complex, and histon H2b is not exposed on the platelet surface, the mechanism of the observed effect may be clarified only after se- ries of further investigations. 102 D. D. Zhernossekov, Y. M. Roka-Moiia, T. V. Grinenko Future perspective Although numerous studies clearly indicate that ex- tracellular annexins play an important role in the functioning of human organisms, there are still many gaps in our understanding of the molecular mecha- nisms underlying their action. The structural pecu- liarities of annexins may be very important in this case. As it was shown some annexins (A2 and A5) interact with carbohydrates, in particular glycosami- noglycans. These interactions are likely to come into play only for extracellular annexins but functional significance of this binding remains to be proven [41,42]. On the other hand, there are some proposals for practical application of annexins in medical prac- tice. It has been reported about diannexin, an annex- in A5 homodimer that binds phosphatidyl serine with high affinity (0.6 nM) [43]. This new prepara- tion may find practical application in medicine due to its ability to reduce the surface area coverage by platelets perfused with human blood and to inhibit in vivo the thrombus formation and fibrin deposition in the rat and rabbit models of arterial and venous thrombosis. There are numerous reports about the agents con- structed on the annexin base as apoptotic markers [44-46]. Elevated annexin V levels have been found in acute and chronic renal conditions [47]; in pa- tients with heart failure a high circulating annexin V level is likely to reflect peripheral organ damage [48]. Some annexins can be predicted as therapeutic agents. So, annexin V can be used in treatment of the patients with sickle cell disease [49]. There are some interesting reports concerning using annexin V as a potential marker in tumors [50,51] and as a thera- peutic agent for the patients with diffuse large B-cell lymphoma [52]. 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An- nexin A5 inhibits diffuse large B-cell lymphoma cell inva- sion and chemoresistance through phosphatidylinositol 3-kinase signaling. Oncol Rep. 2014;32(6):2557–63. Позаклітинні анексини у системі гемостазу Д. Д. Жерносєков, Я. М. Рока-Мойя, T. В. Гриненко Аннесини – це кальцій-залежні протеїни, що взаємодіють з клітинними мембранами завдяки їх властивості зв’язувати фосфоліпіди. Структурно-функціональні особливості цих про- теїнів надані в науковій літературі. Хоча анексини – цитозольні протеїни, для них притаманна позаклітинна активність. Існують суперечливі дані стосовно ролі позаклітинних анекси- нів у системі гемостазу. Ми спробували систематизувати су- часні наукові дані та виявити можливе застосування анексинів у медичній практиці. К л юч ов і с л ов а: анексини, гемостаз, плазміноген/плазмі- нова система. Внеклеточние аннексины в системе гемостаза Д. Д. Жерносеков, Я. М. Рока-Мойя, T. В. Гриненко Аннексины – это кальций-зависимые протеины, которые взаи- модействуют с клеточными мембранами благодаря их способ- ности связывать фосфолипиды. Структурно-функциональные особенности этих белков описаны в научной литературе. Хотя аннексины – цитозольные протеины, для них показана внекле- точная активность. Существуют противоречивые мнения каса- тельно функциональной роли внеклеточних аннексинов в си- стеме гемостаза. Мы предприняли попытку систематизировать последние научные данные и рассмотреть возможное приме- нение аннексинов в медицинской практике. К л юч е в ы е с л ов а: аннексины, гемостаз, плазминоген/ плазминовая система. Received 01.03.2016