P-selectin

Last updated
SELP
Pselectin.PNG
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases SELP , CD62, CD62P, GMP140, GRMP, LECAM3, PADGEM, PSEL, selectin P
External IDs OMIM: 173610 MGI: 98280 HomoloGene: 2260 GeneCards: SELP
Orthologs
SpeciesHumanMouse
Entrez

6403

20344

Ensembl

ENSG00000174175

ENSMUSG00000026580

UniProt

P16109

Q01102

RefSeq (mRNA)

NM_003005

NM_011347

RefSeq (protein)

NP_002996
NP_002996.2

NP_035477

Location (UCSC) Chr 1: 169.59 – 169.63 Mb Chr 1: 163.94 – 163.98 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

P-selectin is a type-1 transmembrane protein that in humans is encoded by the SELP gene. [5]

Contents

P-selectin functions as a cell adhesion molecule (CAM) on the surfaces of activated endothelial cells, which line the inner surface of blood vessels, and activated platelets. In unactivated endothelial cells, it is stored in granules called Weibel-Palade bodies. In unactivated platelets P-selectin is stored in α-granules.

Other names for P-selectin include CD62P, Granule Membrane Protein 140 (GMP-140), and Platelet Activation-Dependent Granule to External Membrane Protein (PADGEM). It was first identified in endothelial cells in 1989. [6]

Gene and regulation

P-selectin is located on chromosome 1q21-q24, spans > 50 kb and contains 17 exons in humans. [7] P-selectin is constitutively expressed in megakaryocytes (the precursor of platelets) and endothelial cells. [8] P-selectin expression is induced by two distinct mechanisms. First, P-selectin is synthesized by megakaryocytes and endothelial cells, where it is sorted into the membranes of secretory granules. [9] When megakaryocytes and endothelial cells are activated by agonists such as thrombin, P-selectin is rapidly translocated to the plasma membrane from granules. [10] Secondly, increased levels of P-selectin mRNA and protein are induced by inflammatory mediators such as tumor necrosis factor-a (TNF-a), LPS, and interleukin-4 (IL-4). Although TNF-a and LPS increase levels of both mRNA and protein in murine models, they do not appear to affect mRNA in human endothelial cells, while IL-4 increases P-selectin transcription in both species. [11] [12] [13] The elevated synthesis of P-selectin may play an important role in the delivery of protein to the cell surface. In ischemic stroke patients, plasma P-selectin concentration was reported to be highly correlated to plasminogen activator inhibitor-1 activity and tissue plasminogen activator activity. [14]

Structure

P-selectin is found in endothelial cells and platelets where it is stored in Weibel-Palade bodies and α-granules, respectively. In response to inflammatory cytokines such as IL-4 and IL-13, P-selectin is translocated to the plasma membrane in endothelial cells. [15] The extracellular region of P-selectin is composed of three different domains like other selectin types; a C-type lectin-like domain in the N-terminus, an EGF-like domain and a complement-binding protein-like domains (same as complement regulatory proteins: CRP) having short consensus repeats (~60 amino acids). The number of CRP repeats is the major feature differentiating the type of selectin in extracellular region. In human, P-selectin has nine repeats while E-selectin contains six and L-selectin has only two. P-selectin is anchored in transmembrane region that is followed by a short cytoplasmic tail region. [16]

Ligand

The primary ligand for P-selectin is P-selectin glycoprotein ligand-1 (PSGL-1) which is expressed on almost all leukocytes, although P-selectin also binds to heparan sulfate and fucoidans. PSGL-1 is situated on various hematopoietic cells such as neutrophils, eosinophils, lymphocytes, and monocytes, in which it mediates tethering and adhesion of these cells. However, PSGL-1 is not specific for P-selectin, as it can also function as a ligand for both E- and L-selectin. [17]

Function

P-selectin plays an essential role in the initial recruitment of leukocytes (white blood cells) to the site of injury during inflammation. When endothelial cells are activated by molecules such as histamine or thrombin during inflammation, P-selectin moves from an internal cell location to the endothelial cell surface.

Thrombin is one trigger which can stimulate endothelial-cell release of P-selectin and recent studies suggest an additional Ca2+-independent pathway involved in the release of P-selectin. [18]

Ligands for P-selectin on eosinophils and neutrophils are similar sialylated, protease-sensitive, endo-beta-galactosidase-resistant structures, clearly different from those reported for E-selectin, and suggest disparate roles for P-selectin and E-selectin during recruitment during inflammatory responses. [19]

P-selectin is also very important in the recruitment and aggregation of platelets at areas of vascular injury. In a quiescent platelet, P-selectin is located on the inner wall of α-granules. Platelet activation (through agonists such as thrombin, Type II collagen and ADP) results in "membrane flipping" where the platelet releases α- and dense granules and the inner walls of the granules are exposed on the outside of the cell. The P-selectin then promotes platelet aggregation through platelet-fibrin and platelet-platelet binding.

P-selectin attaches to the actin cytoskeleton through anchor proteins that are still poorly characterized. [20]

Role in cancer

P-selectin has a functional role in tumour metastasis similar to E-selectin. [21] P-selectin is expressed on the surface of both stimulated endothelial cells and activated platelets, and helps cancer cells invade into the bloodstream for metastasis and provides local multiple growth factors, respectively. [22] Moreover, platelets facilitate tumor metastasis by forming complexes with tumour cells and leukocytes in the vasculature, thus preventing recognition by macrophages. This is thought to contribute to the seeding of tumour microemboli in distant organs. [23] In vivo mice experiments have shown that a reduction in circulating platelets could reduce cancer metastasis. [24]

The oligosaccharide sialylated Lewis x (sLe(x)) is expressed on the surface of tumor cells and can be recognized by E-selectin and P-selectin, playing on a key role in metastasis of the tumor. However, in the 4T1 breast cancer cell line, E-selectin reactivity is sLe(x) dependent while P-selectin reactivity is sLe(x)-independent, suggesting P-selectin binding is Ca2+-independent and sulfation-dependent. [25] One of the sulfated ligands is chondroitin sulfate, a type of glycosaminoglycan (GAG). Its activity in tumor metastasis has been probed by the addition of heparin that functions to blocks tumor metastasis. In addition to GAGs, mucin is of interest in P-selectin mediated tumor metastasis. [26] Selective removal of mucin results in reduced interaction between P-selectin and platelets in vivo and in vitro. [23]

Heparin has long been known to represent antiheparanase activity that is to keep an endoglycosidase from degrading heparan sulfate, one of the glycosaminoglycans, and to effectively inhibit P-selectin. [27] Despite a striking effect of heparin on tumor progression shown in a number of clinical trials, [28] the use of heparin as anti-cancer agent is limited because of its risk, which might induce adverse bleeding complications. Given those reasons, development of new compounds that target P-selectin is now emerging for cancer therapy. Among them, the inhibitory activity of semisynthetic sulfated tri mannose C-C-linked dimers (STMCs) to P-selectin was shown by the attenuation of tumor metastasis in vivo animal model, indicating the inhibition of interaction between tumor cell and endothelial cell is significant for blocking tumor dissemination. [29]

As a drug target

Crizanlizumab is a monoclonal antibody against P-selectin. [30] which has now been approved by Novartis on November 15, 2019 for the indication of vaso-occlusive crisis in sickle cell patients.

See also

Related Research Articles

<span class="mw-page-title-main">Cell adhesion</span> Process of cell attachment

Cell adhesion is the process by which cells interact and attach to neighbouring cells through specialised molecules of the cell surface. This process can occur either through direct contact between cell surfaces such as cell junctions or indirect interaction, where cells attach to surrounding extracellular matrix, a gel-like structure containing molecules released by cells into spaces between them. Cells adhesion occurs from the interactions between cell-adhesion molecules (CAMs), transmembrane proteins located on the cell surface. Cell adhesion links cells in different ways and can be involved in signal transduction for cells to detect and respond to changes in the surroundings. Other cellular processes regulated by cell adhesion include cell migration and tissue development in multicellular organisms. Alterations in cell adhesion can disrupt important cellular processes and lead to a variety of diseases, including cancer and arthritis. Cell adhesion is also essential for infectious organisms, such as bacteria or viruses, to cause diseases.

Weibel–Palade bodies (WPBs) are the storage granules of endothelial cells, the cells that form the inner lining of the blood vessels and heart. They manufacture, store and release two principal molecules, von Willebrand factor and P-selectin, and thus play a dual role in hemostasis and inflammation.

Cell adhesion molecules (CAMs) are a subset of cell surface proteins that are involved in the binding of cells with other cells or with the extracellular matrix (ECM), in a process called cell adhesion. In essence, CAMs help cells stick to each other and to their surroundings. CAMs are crucial components in maintaining tissue structure and function. In fully developed animals, these molecules play an integral role in generating force and movement and consequently ensuring that organs are able to execute their functions normally. In addition to serving as "molecular glue", CAMs play important roles in the cellular mechanisms of growth, contact inhibition, and apoptosis. Aberrant expression of CAMs may result in a wide range of pathologies, ranging from frostbite to cancer.

<span class="mw-page-title-main">P-selectin glycoprotein ligand-1</span> Protein-coding gene in the species Homo sapiens

Selectin P ligand, also known as SELPLG or CD162, is a human gene.

<span class="mw-page-title-main">Selectin</span> Family of cell adhesion molecules

The selectins are a family of cell adhesion molecules. All selectins are single-chain transmembrane glycoproteins that share similar properties to C-type lectins due to a related amino terminus and calcium-dependent binding. Selectins bind to sugar moieties and so are considered to be a type of lectin, cell adhesion proteins that bind sugar polymers.

<span class="mw-page-title-main">CD31</span> Mammalian protein found in Homo sapiens

Platelet endothelial cell adhesion molecule (PECAM-1) also known as cluster of differentiation 31 (CD31) is a protein that in humans is encoded by the PECAM1 gene found on chromosome17q23.3. PECAM-1 plays a key role in removing aged neutrophils from the body.

<span class="mw-page-title-main">CD44</span> Cell-surface glycoprotein

The CD44 antigen is a cell-surface glycoprotein involved in cell–cell interactions, cell adhesion and migration. In humans, the CD44 antigen is encoded by the CD44 gene on chromosome 11. CD44 has been referred to as HCAM, Pgp-1, Hermes antigen, lymphocyte homing receptor, ECM-III, and HUTCH-1.

<span class="mw-page-title-main">ICAM-1</span> Mammalian protein found in Homo sapiens

ICAM-1 also known as CD54 is a protein that in humans is encoded by the ICAM1 gene. This gene encodes a cell surface glycoprotein which is typically expressed on endothelial cells and cells of the immune system. It binds to integrins of type CD11a / CD18, or CD11b / CD18 and is also exploited by rhinovirus as a receptor for entry into respiratory epithelium.

<span class="mw-page-title-main">L-selectin</span> Mammalian protein found in Homo sapiens

L-selectin, also known as CD62L, is a cell adhesion molecule found on the cell surface of leukocytes, and the blastocyst. It is coded for in the human by the SELL gene. L-selectin belongs to the selectin family of proteins, which recognize sialylated carbohydrate groups containing a Sialyl LewisX (sLeX) determinant. L-selectin plays an important role in both the innate and adaptive immune responses by facilitating leukocyte-endothelial cell adhesion events. These tethering interactions are essential for the trafficking of monocytes and neutrophils into inflamed tissue as well as the homing of lymphocytes to secondary lymphoid organs. L-selectin is also expressed by lymphoid primed hematopoietic stem cells and may participate in the migration of these stem cells to the primary lymphoid organs. In addition to its function in the immune response, L-selectin is expressed on embryonic cells and facilitates the attachment of the blastocyst to the endometrial endothelium during human embryo implantation.

<span class="mw-page-title-main">E-selectin</span>

E-selectin, also known as CD62 antigen-like family member E (CD62E), endothelial-leukocyte adhesion molecule 1 (ELAM-1), or leukocyte-endothelial cell adhesion molecule 2 (LECAM2), is a selectin cell adhesion molecule expressed only on endothelial cells activated by cytokines. Like other selectins, it plays an important part in inflammation. In humans, E-selectin is encoded by the SELE gene.

Sulfatide, also known as 3-O-sulfogalactosylceramide, SM4, or sulfated galactocerebroside, is a class of sulfolipids, specifically a class of sulfoglycolipids, which are glycolipids that contain a sulfate group. Sulfatide is synthesized primarily starting in the endoplasmic reticulum and ending in the Golgi apparatus where ceramide is converted to galactocerebroside and later sulfated to make sulfatide. Of all of the galactolipids that are found in the myelin sheath, one fifth of them are sulfatide. Sulfatide is primarily found on the extracellular leaflet of the myelin plasma membrane produced by the oligodendrocytes in the central nervous system and in the Schwann cells in the peripheral nervous system. However, sulfatide is also present on the extracellular leaflet of the plasma membrane of many cells in eukaryotic organisms.

Sialyl-Lewis <sup>X</sup> Chemical compound

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<span class="mw-page-title-main">Leukocyte extravasation</span>

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<span class="mw-page-title-main">LAMP2</span> Protein-coding gene in the species Homo sapiens

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<span class="mw-page-title-main">ALCAM</span> Protein-coding gene in the species Homo sapiens

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References

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