Deleted in malignant brain tumors 1 protein is a protein that in humans is encoded by the DMBT1 gene. [5] [6]
Deleted in malignant brain tumors 1 protein is a protein that in humans is encoded by the DMBT1 gene. [5] [6]
Loss of sequences from human chromosome 10q has been associated with the progression of human cancers. The gene DMBT1 was originally isolated based on its deletion in a medulloblastoma cell line. DMBT1 is expressed with transcripts of 6.0, 7.5, and 8.0 kb in fetal lung and with one transcript of 8.0 kb in adult lung, although the 7.5 kb transcript has not been characterized. The DMBT1 protein is a glycoprotein containing multiple scavenger receptor cysteine-rich (SRCR) domains separated by SRCR-interspersed domains (SID). Transcript variant 2 (8.0 kb) has been shown to bind surfactant protein D independently of carbohydrate recognition. This indicates that DMBT1 may not be a classical tumor suppressor gene, but rather play a role in the interaction of tumor cells and the immune system. [7]
At epithelial barriers molecular pattern recognition mechanisms act as minesweepers against harmful environmental factors and thereby play a crucial role in the defense against invading bacterial and viral pathogens. However, it became evident that some of the proteins participating in these host defense processes may simultaneously function as regulators of tissue regeneration when in the extracellular matrix, thus coupling defense functions with regulation of stem cells. Although molecular pattern recognition has complex physiological roles and we just begin to understand its various functions, the simplicity of the underlying principles for recognition of specific classes of molecules may generate novel starting points for nanomedical approaches in drug delivery across epithelial barriers. The protein DMBT1, showed pattern recognition activity for poly-sulfated and poly-phosphorylated ligands, including nucleic acids, and the ability to aggregate ligands. This raises the interesting question in how far these properties can be utilized to assemble nucleic acidpeptide nano-complexes and whether this can be exploited to modulate the pharmacological properties of nucleic acids and/or for nucleic acid delivery to target cells [8] Recently, DMBT1-derived peptides have been successfully harnessed for siRNA intracellular delivery. [9]
DMBT1 has been shown to interact with Surfactant protein D. [10] [11] DMBT1-derived peptides also interacts with nucleic acids. [9]
Collectins (collagen-containing C-type lectins) are a part of the innate immune system. They form a family of collagenous Ca2+-dependent defense lectins, which are found in animals. Collectins are soluble pattern recognition receptors (PRRs). Their function is to bind to oligosaccharide structure or lipids that are on the surface of microorganisms. Like other PRRs they bind pathogen-associated molecular patterns (PAMPs) and danger-associated molecular patterns (DAMPs) of oligosaccharide origin. Binding of collectins to microorganisms may trigger elimination of microorganisms by aggregation, complement activation, opsonization, activation of phagocytosis, or inhibition of microbial growth. Other functions of collectins are modulation of inflammatory, allergic responses, adaptive immune system and clearance of apoptotic cells.
CD68 is a protein highly expressed by cells in the monocyte lineage, by circulating macrophages, and by tissue macrophages.
Surfactant protein D, also known as SP-D, is a lung surfactant protein part of the collagenous family of proteins called collectin. In humans, SP-D is encoded by the SFTPD gene and is part of the innate immune system. Each SP-D subunit is composed of an N-terminal domain, a collagenous region, a nucleating neck region, and a C-terminal lectin domain. Three of these subunits assemble to form a homotrimer, which further assemble into a tetrameric complex.
Heparin-binding EGF-like growth factor (HB-EGF) is a member of the EGF family of proteins that in humans is encoded by the HBEGF gene.
Integrin alpha-IIb is a protein that in humans is encoded by the ITGA2B gene. ITGA2B, also known as CD41, encodes integrin alpha chain 2b. Integrins are heterodimeric integral membrane proteins composed of an alpha chain and a beta chain. Alpha chain 2b undergoes post-translational cleavage to yield disulfide-linked light and heavy chains that join with beta 3 to form a fibrinogen receptor expressed in platelets that plays a crucial role in coagulation. Mutations that interfere with this role result in thrombasthenia. At least 38 disease-causing mutations in this gene have been discovered. In addition to adhesion, integrins are known to participate in cell-surface mediated signalling.
AKT2, also known as RAC-beta serine/threonine-protein kinase, is an enzyme that in humans is encoded by the AKT2 gene. It influences metabolite storage as part of the insulin signal transduction pathway.
Mucin-4 (MUC-4) is a mucin protein that in humans is encoded by the MUC4 gene. Like other mucins, MUC-4 is a high-molecular weight glycoprotein.
Surfactant protein A1(SP-A1), also known as Pulmonary surfactant-associated protein A1(PSP-A) is a protein that in humans is encoded by the SFTPA1 gene.
Carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) also known as CD66a, is a human glycoprotein, and a member of the carcinoembryonic antigen (CEA) gene family.
Laminin subunit gamma-2 is a protein that in humans is encoded by the LAMC2 gene.
Signal regulatory protein α (SIRPα) is a regulatory membrane glycoprotein from SIRP family expressed mainly by myeloid cells and also by stem cells or neurons.
Glycoprotein Ib (platelet), beta polypeptide (GP1BB) also known as CD42c, is a protein that in humans is encoded by the GP1BB gene.
Galectin-3-binding protein is a protein that in humans is encoded by the LGALS3BP gene.
Pregnancy-specific beta-1-glycoprotein 1 (PSBG-1) also known as CD66f, is a protein that in humans is encoded by the PSG1 gene and is a member of the carcinoembryonic antigen (CEA) gene family. Pregnancy-specific glycoproteins (PSGs) are a complex consisting of carbohydrate and protein, which is present in the mammalian body specifically during pregnancy. This glycoprotein is the most abundant protein found in the maternal bloodstream during the later stages of pregnancy and it is of vital importance in fetal development. The PSG functions primarily as an immunomodulator to protect the growing fetus.
CD166 antigen is a 100-105 kD typeI transmembrane glycoprotein that is a member of the immunoglobulin superfamily of proteins. In humans it is encoded by the ALCAM gene. It is also called CD166, MEMD, SC-1/DM-GRASP/BEN in the chicken, and KG-CAM in the rat.
MARCKS-related protein is a protein that in humans is encoded by the MARCKSL1 gene.
Prolactin-inducible protein also known as gross cystic disease fluid protein 15 (GCDFP-15), extra-parotid glycoprotein (EP-GP), gp17seminal actin-binding protein (SABP) or BRST2 is a protein that in humans is encoded by the PIP gene. It is upregulated by prolactin and androgens and downregulated by estrogen.
Laminin subunit gamma-3 also known as LAMC3 is a protein that in humans is encoded by the LAMC3 gene.
Epithelial-myoepithelial carcinoma of the lung is a very rare histologic form of malignant epithelial neoplasm ("carcinoma") arising from lung tissue.
Fibrinogen C domain containing 1(FIBCD1) is a protein that in humans is encoded by the FIBCD1 gene localized on chromosome 9q34.1 in close proximity to the genes encoding L- and M-ficolin. FIBCD1 is thought to have a role in both host defence and gut homeostasis.
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