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Integrin melanocyte

Jimmy Rodriguez Murillo, Magdalena Kuras, Melinda Rezeli, Tasso Milliotis, Lazaro Betancourt, Gyorgy Marko-Varga
To acquire a deeper understanding of malignant melanoma (MM), it is essential to study the proteome of patient tissues. In particular, phosphoproteomics of MM has become of significant importance because of the central role that phosphorylation plays in the development of MM. Investigating clinical samples, however, is an extremely challenging task as there is usually only very limited quantities of material available to perform targeted enrichment approaches. Here, an automated phosphopeptide enrichment protocol using the AssayMap Bravo platform was applied to MM tissues and assessed for performance...
2018: PloS One
Hyangmi Kim, Nayoung Yi, Byung-Rok Do, Ai-Young Lee
Coculture with adipose-derived stem cells (ADSCs) can stimulate proliferation and migration of melanocytes. To enhance outcomes of skin disorders caused by melanocyte loss or death, mixed transplantation with ADSCs has been suggested. However, role of cocultured ADSCs in proliferation and migration of melanocytes remains unclear. This study determined the effect of ADSCs on production of growth factors and expression levels of intergrins in primary culture of adult human melanocytes with or without ADSCs and in nude mice grafted with such melanocytes...
December 11, 2018: Biomolecules & Therapeutics
Jenna Geddes Sweeney, Jennifer Liang, Aristotelis Antonopoulos, Nicholas Giovannone, Shuli Kang, Tony S Mondala, Steven R Head, Sandra L King, Yoshihiko Tani, Danielle Brackett, Anne Dell, George F Murphy, Stuart M Haslam, Hans R Widlund, Charles J Dimitroff
Cancer cells often display altered cell-surface glycans compared to their nontransformed counterparts. However, functional contributions of glycans to cancer initiation and progression remain poorly understood. Here, from expression-based analyses across cancer lineages, we found that melanomas exhibit significant transcriptional changes in glycosylation-related genes. This gene signature revealed that, compared to normal melanocytes, melanomas downregulate I-branching glycosyltransferase, GCNT2, leading to a loss of cell-surface I-branched glycans...
August 22, 2018: Nature Communications
Zhongyi Xu, Li Chen, Min Jiang, Qianqian Wang, Chengfeng Zhang, Leihong Flora Xiang
Fibroblast-derived melanogenic paracrine mediators are known to play a role in melanogenesis. To investigate the effect of CCN1 (also called CYR61 or cysteine-rich 61) on melanogenesis, normal human epidermal melanocytes were treated with recombinant CCN1 protein. Our findings show that CCN1 activates melanogenesis through promoting melanosome maturation and up-regulation of MITF, TRP-1, and tyrosinase via the integrin α6β1, p38 MAPK, and ERK signaling pathways. Furthermore, we found that UVB irradiation stimulates the secretion of CCN1 from normal human dermal fibroblasts, and CCN1 knockdown in fibroblasts attenuates melanogenesis in melanocyte-fibroblast co-culture system...
August 2018: Journal of Investigative Dermatology
Meriem Haddada, Hend Draoui, Lydia Deschamps, Francine Walker, Tiphaine Delaunay, Maria Brattsand, Viktor Magdolen, Dalila Darmoul
We recently reported that human melanoma cells, but not benign melanocytes, aberrantly express kallikrein-related peptidase 7 (KLK7). Here, we show a KLK7 overexpression-mediated decrease of cell adhesion to extracellular matrix binding proteins, associated with downregulation of α5/β1/αv/β3 integrin expression. We also report an up-regulation of MCAM/CD146 and an increase in spheroid formation of these cells. Our results demonstrate that aberrant KLK7 expression leads to a switch to a more malignant phenotype suggesting a potential role of KLK7 in melanoma invasion...
September 25, 2018: Biological Chemistry
Stanley Cheuk, Heinrich Schlums, Irène Gallais Sérézal, Elisa Martini, Samuel C Chiang, Nicole Marquardt, Anna Gibbs, Ebba Detlofsson, Andrea Introini, Marianne Forkel, Charlotte Höög, Annelie Tjernlund, Jakob Michaëlsson, Lasse Folkersen, Jenny Mjösberg, Lennart Blomqvist, Marcus Ehrström, Mona Ståhle, Yenan T Bryceson, Liv Eidsmo
Tissue-resident memory T (Trm) cells form a heterogeneous population that provides localized protection against pathogens. Here, we identify CD49a as a marker that differentiates CD8+ Trm cells on a compartmental and functional basis. In human skin epithelia, CD8+ CD49a+ Trm cells produced interferon-γ, whereas CD8+ CD49a- Trm cells produced interleukin-17 (IL-17). In addition, CD8+ CD49a+ Trm cells from healthy skin rapidly induced the expression of the effector molecules perforin and granzyme B when stimulated with IL-15, thereby promoting a strong cytotoxic response...
February 21, 2017: Immunity
Edward Helal-Neto, Renata M Brandão-Costa, Roberta Saldanha-Gama, Cristiane Ribeiro-Pereira, Victor Midlej, Marlene Benchimol, Verônica Morandi, Christina Barja-Fidalgo
The unique composition of tumor-produced extracellular matrix (ECM) can be a determining factor in changing the profile of endothelial cells in the tumor microenvironment. As the main receptor for ECM proteins, integrins can activate a series of signaling pathways related to cell adhesion, migration, and differentiation of endothelial cells that interact with ECM proteins. We studied the direct impact of the decellularized ECM produced by a highly metastatic human melanoma cell line (MV3) on the activation of endothelial cells and identified the intracellular signaling pathways associated with cell differentiation...
November 2016: Journal of Cellular Physiology
Carole Siret, Chloé Terciolo, Aurelie Dobric, Marie-Christine Habib, Sebastien Germain, Renaté Bonnier, Dominique Lombardo, Véronique Rigot, Frédéric André
BACKGROUND: Malignant transformation of melanocytes frequently coincides with an alteration in the expression of cell-cell adhesion molecules (cadherins) and cell-extracellular matrix proteins (integrins). How these two adhesion systems interplay to impact on cell invasion remains to be described in melanoma. METHODS: Cell adhesion networks were localised by immunofluorescence in human primary cutaneous melanoma, metastatic melanoma in the lymph nodes, and melanoma cell lines...
November 17, 2015: British Journal of Cancer
Han Wang, Xie Luo, Jake Leighton
Embryonic stem cells (ESCs) are pluripotent cells with great therapeutic potentials. The in vitro differentiation of ESC was designed by recapitulating embryogenesis. Significant progress has been made to improve the in vitro differentiation protocols by toning soluble maintenance factors. However, more robust methods for lineage-specific differentiation and maturation are still under development. Considering the complexity of in vivo embryogenesis environment, extracellular matrix (ECM) cues should be considered besides growth factor cues...
2015: Biochemistry Insights
Elizabeth K Duperret, Ankit Dahal, Todd W Ridky
Integrins play crucial roles in epithelial adhesion, proliferation, wound healing and cancer. In the epidermis, the roles of many integrin subunits are incompletely defined and mechanistic details regarding their functions are lacking. We performed a multiplexed small hairpin (sh)RNA screen to define roles for each subunit in human organotypic skin. We show that integrin-αv (also known as ITGAV) heterodimers are essential for epidermal generation, with integrin-αv loss driving a keratinocyte G1-S cell cycle block...
November 1, 2015: Journal of Cell Science
Naresh Polisetti, Matthias Zenkel, Johannes Menzel-Severing, Friedrich E Kruse, Ursula Schlötzer-Schrehardt
Interactions between stem cells and their microenvironment are critical for regulation and maintenance of stem cell function. To elucidate the molecular interactions within the human limbal epithelial stem/progenitor cell (LEPC) niche, which is essential for maintaining corneal transparency and vision, we performed a comprehensive expression analysis of cell adhesion molecules (CAMs) using custom-made quantitative real-time polymerase chain reaction (qRT-PCR) arrays and laser capture-microdissected LEPC clusters, comprising LEPCs, melanocytes, mesenchymal cells, and transmigrating immune cells...
January 2016: Stem Cells
Elena Rahn, Philipp Petermann, Katharina Thier, Wilhelm Bloch, Jessica Morgner, Sara A Wickström, Dagmar Knebel-Mörsdorf
Herpes simplex virus type 1 (HSV-1) invades its human host via the skin or mucosa. We aim to understand how HSV-1 overcomes the barrier function of the host epithelia, and for this reason, we established an ex vivo infection assay initially with murine skin samples. Here, we report how tissue has to be prepared to be susceptible to HSV-1 infection. Most efficient infection of the epidermis was achieved by removing the dermis. HSV-1 initially invaded the basal epidermal layer, and from there, spreading to the suprabasal layers was observed...
December 2015: Journal of Investigative Dermatology
Wissam Beaino, Carolyn J Anderson
UNLABELLED: Melanoma is a malignant tumor derived from epidermal melanocytes, and it is known for its aggressiveness, therapeutic resistance, and predisposition for late metastasis. Very late antigen-4 (VLA-4; also called integrin α4β1) is a transmembrane noncovalent heterodimer overexpressed in melanoma tumors that plays an important role in tumor growth, angiogenesis, and metastasis by promoting adhesion and migration of cancer cells. In this study, we evaluated 2 conjugates of a high-affinity VLA-4 peptidomimetic ligand, LLP2A, for PET/CT imaging in a subcutaneous and metastatic melanoma tumor...
November 2014: Journal of Nuclear Medicine: Official Publication, Society of Nuclear Medicine
Séverine Tabone-Eglinger, Zuleika Calderin-Sollet, Perrine Pinon, Nicole Aebischer, Monique Wehrle-Haller, Marie-Claude Jacquier, David Boettiger, Bernhard Wehrle-Haller
Kit ligand (KitL) and its tyrosine kinase receptor c-kit are critical for germ cells, melanocytes, mastocytes, and hematopoietic stem cells. Alternative splicing of KitL generates membrane-bound KitL (mb-KitL) or soluble KitL, providing survival or cell migration, respectively. Here we analyzed whether c-kit can function both as an adhesion and signaling receptor to mb-KitL presented by the environmental niche. At contacts between fibroblasts and MC/9 mast cells, mb-KitL, and c-kit formed ligand/receptor clusters that formed stable complexes, which resisted dissociation by c-kit blocking mAbs and provided cell anchorage under physiological shear stresses...
October 2014: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
Hyunjung Choi, Mina Kim, Song Ih Ahn, Eun-Gyung Cho, Tae Ryong Lee, Jennifer H Shin
The elasticity of the cellular microenvironment is a key regulator of cellular physiology in many cell types. To investigate the effects of substrate stiffness on the pigmentation process, we cultured normal human melanocytes (NHM) and MNT1 melanoma cells on laminin-coated polydimethylsiloxane (PDMS) substrates of different stiffness. The dendricity of NHM and MNT1 cells was reduced as the substrate stiffness decreased, and the degree of melanosome transfer from NHM or MNT1 cells to normal human keratinocytes was decreased on softer substrates with the reduced dendricity...
March 2014: Experimental Dermatology
Jing Lu, Yun Tang, Maham Farshidpour, Yabin Cheng, Guohong Zhang, Seyed Mehdi Jafarnejad, Alan Yip, Magdalena Martinka, Ziming Dong, Jianwei Zhou, Jinhua Xu, Gang Li
Melanoma is the deadliest cutaneous malignancy because of its high incidence of metastasis. Melanoma growth and metastasis relies on sustained angiogenesis; therefore, inhibiting angiogenesis is a promising approach to treat metastatic melanoma. JWA is a novel microtubule-associated protein and our previous work revealed that JWA inhibited melanoma cell invasion and metastasis. However, the role of JWA in melanoma angiogenesis and the prognostic value are still unknown. Here, we report that JWA in melanoma cells significantly inhibited the tube formation of endothelial cells...
December 2013: Carcinogenesis
Mariana Toricelli, Fabiana H M Melo, Giovani B Peres, Débora C P Silva, Miriam G Jasiulionis
BACKGROUND: Anoikis resistance is one of the abilities acquired along tumor progression. This characteristic is associated with metastasis development, since tumorigenic cells must survive independently of cell-matrix interactions in this process. In our laboratory, it was developed a murine melanocyte malignant transformation model associated with a sustained stressful condition. After subjecting melan-a melanocytes to 1, 2, 3 and 4 cycles of anchorage impediment, anoikis resistant cells were established and named 1C, 2C, 3C and 4C, respectively...
2013: Molecular Cancer
D Suesskind, S Gauss, U E A Faust, P Bauer, M Schrader, K U Bartz-Schmidt, S Henke-Fahle
BACKGROUND: The establishment of long-term uveal melanoma (UM) cell lines is difficult. However, studying living cells and their behaviour in the presence of other cells and the extracellular matrix is important in terms of understanding tumour biology and malignant behaviour. We have established three UM cell lines and report a first characterisation of these cell lines. METHODS: Three established UM cell lines (UMT2, UMT26 and UMT33) were analysed according to their morphologic characteristics, melanocytic differentiation, adhesion on different extracellular matrices and proliferative activity...
August 2013: Graefe's Archive for Clinical and Experimental Ophthalmology
Matthew T Harper, Marion T J van den Bosch, Ingeborg Hers, Alastair W Poole
BACKGROUND: The motor protein myosin Va plays an important role in the trafficking of intracellular vesicles. Mutation of the Myo5a gene causes Griscelli syndrome type 1 in humans and the dilute phenotype in mice, which are both characterised by pigment dilution and neurological defects as a result of impaired vesicle transport in melanocytes and neuroendocrine cells. The role of myosin Va in platelets is currently unknown. Rab27 has been shown to be associated with myosin Va cargo vesicles and is known to be important in platelet dense granule biogenesis and secretion, a crucial event in thrombus formation...
2013: PloS One
Chun-Ho Shih, Tin-Bin Chiang, Wen-Jeng Wang
Acurhagin-C, a Glu-Cys-Asp (ECD)-disintegrin from Agkistrodon acutus venom, has been reported as an endothelial apoptosis inducer, previously. Here we further evaluate its potential applications in cancer therapy. In vitro assays indicated that acurhagin-C not only may influence the cell viability at higher concentration, but also can potently and dose-dependently decrease cell proliferation in murine B16-F10 melanoma. Otherwise, it also had a dose-dependent inhibition on B16-F10 cell adhesion to extracellular matrices, collagen VI, gelatin B and fibronectin, as well as disturbed transendothelial migration of B16-F10 cell...
April 24, 2013: Matrix Biology: Journal of the International Society for Matrix Biology
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