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https://www.readbyqxmd.com/read/28927892/cd100-plexin-b2-promotes-the-inflammation-in-psoriasis-by-activating-nf-%C3%AE%C2%BAb-and-inflammasome-in-keratinocytes
#1
Chen Zhang, Chunying Xiao, Erle Dang, Jiao Cao, Zhenlai Zhu, Meng Fu, Xu Yao, Yufeng Liu, Boquan Jin, Gang Wang, Wei Li
Plexin-B2 (PlxnB2) and its ligand, CD100 (Semaphorin 4D), are originally identified as axon-guidance molecules that function during neuronal development; however, studies also showed that CD100-Plexins participate in various immune responses. In the present study, we found that the expression of PlxnB2 on keratinocytes was specifically increased in lesional skin of psoriasis patients, but not atopic dermatitis. Levels of soluble CD100 (sCD100) and membrane CD100 (mCD100) were elevated in sera of psoriasis patients and on keratinocytes of psoriatic skin, respectively...
September 16, 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28912336/elevated-semaphorin-5a-in-patients-with-hashimoto-s-thyroiditis-a-case-control-study
#2
Yongping Liu, Shuo Wang, Qingling Guo, Yongze Li, Jing Qin, Na Zhao, Yushu Li, Zhongyan Shan, Weiping Teng
OBJECTIVE: Hashimoto's thyroiditis (HT) is characterised by elevated specific auto-antibodies, including TgAb and TPOAb. Increasing evidence has demonstrated the essential role of Th17 cells in HT. However, the underlying mechanism is still unclear. Semaphorin 5A (Sema5A) is involved in several autoimmune diseases through regulation of immune cells. The aim of this study was to explore the role of Sema5A in HT. METHODS: We measured serum Sema5A levels in HT (n = 92) and healthy controls (n = 111) by ELISA...
September 14, 2017: Endocrine Connections
https://www.readbyqxmd.com/read/28902178/tumor-inhibitory-effect-of-ircr201-a-novel-cross-reactive-c-met-antibody-targeting-the-psi-domain
#3
Hyunkyu Park, Donggeon Kim, Eunmi Kim, Jason K Sa, Hee Won Lee, Suji Yu, Jiwon Oh, Seok-Hyung Kim, Yeup Yoon, Do-Hyun Nam
Hepatocyte growth factor receptor (HGFR, c-Met) is an essential member of the receptor tyrosine kinase (RTK) family that is often dysregulated during tumor progression, driving a malignant phenotypic state and modulating important cellular functions including tumor growth, invasion, metastasis, and angiogenesis, providing a strong rationale for targeting HGF/c-Met signaling axis in cancer therapy. Based on its protumorigenic potentials, we developed IRCR201, a potent antagonistic antibody targeting the plexin-semaphorin-integrin (PSI) domain of c-Met, using synthetic human antibody phage libraries...
September 13, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28878126/endothelium-derived-extracellular-vesicles-promote-splenic-monocyte-mobilization-in-myocardial-infarction
#4
Naveed Akbar, Janet E Digby, Thomas J Cahill, Abhijeet N Tavare, Alastair L Corbin, Sushant Saluja, Sam Dawkins, Laurienne Edgar, Nadiia Rawlings, Klemen Ziberna, Eileen McNeill, Errin Johnson, Alaa A Aljabali, Rebecca A Dragovic, Mala Rohling, T Grant Belgard, Irina A Udalova, David R Greaves, Keith M Channon, Paul R Riley, Daniel C Anthony, Robin P Choudhury
Transcriptionally activated monocytes are recruited to the heart after acute myocardial infarction (AMI). After AMI in mice and humans, the number of extracellular vesicles (EVs) increased acutely. In humans, EV number correlated closely with the extent of myocardial injury. We hypothesized that EVs mediate splenic monocyte mobilization and program transcription following AMI. Some plasma EVs bear endothelial cell (EC) integrins, and both proinflammatory stimulation of ECs and AMI significantly increased VCAM-1-positive EV release...
September 7, 2017: JCI Insight
https://www.readbyqxmd.com/read/28853092/involvement-of-semaphorin-sema4d-in-t-dependent-activation-of-b-cells
#5
Е М Kuklina, I V Nekrasova, Yu V Valieva
The involvement of endogenous semaphorin (Sema4D) into the key stage of T-dependent differentiation of B cells, formation of plasmoblasts, was demonstrated in vitro in T/B cell co-culture under conditions of polyclonal activation of T cells. The effect of semaphorin was not associated with activation of high-affinity Sema4D receptor plexin B1, but involves lowaffinity receptor CD72. These data indicate that Sema4D-dependent signal regulates not only the initial stage of B-cell activation, proliferative response to the antigen, but also further differentiation of B cells into plasma cells...
August 29, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28843905/role-of-neuropilin-2-in-the-immune-system
#6
REVIEW
S Schellenburg, A Schulz, D M Poitz, M H Muders
Neuropilins (NRPs) are single transmembrane receptors with short cytoplasmic tails and are dependent on receptors like VEGF receptors or Plexins for signal transduction. NRPs are known to be important in angiogenesis, lymphangiogenesis, and axon guidance. The Neuropilin-family consists of two members, Neuropilin-1 (NRP1) and Neuropilin-2 (NRP2). They are up to 44 % homologous and conserved in all vertebrates. High levels of NRP2 are found on immune cells. Current research is very limited regarding the functions of NRP2 on these cells...
August 24, 2017: Molecular Immunology
https://www.readbyqxmd.com/read/28835374/low-affinity-binding-in-cis-to-p2y2r-mediates-force-dependent-integrin-activation-during-hantavirus-infection
#7
Virginie Bondu, Chenyu Wu, Wenpeng Cao, Peter C Simons, Jennifer Gillette, Jieqing Zhu, Laurie Erb, X Frank Zhang, Tione Buranda
Pathogenic hantaviruses bind to the Plexin Semaphorin Integrin (PSI) domain of inactive, β3 integrins. Previous studies have implicated a cognate cis interaction between the bent conformation β5/β3 integrins and an RGD sequence in the first extracellular loop of P2Y2R (Erb et al., 2001). With single-molecule atomic force microscopy, we show a cognate interaction between (RGD)P2Y2R and an AFM tip decorated with recombinant αIIbβ3 integrins expressed on cell membranes. Mutation of the RGD sequence to RGE in the P2Y2R removes this interaction...
August 23, 2017: Molecular Biology of the Cell
https://www.readbyqxmd.com/read/28817310/semaphorins-and-their-roles-in-airway-biology-potential-as-therapeutic-targets
#8
Hesam Movassagh, Forough Khadem, Abdelilah S Gounni
Semaphorins are a large family of proteins originally identified as axon guidance cues which play a crucial role in neural development. They are also ubiquitously expressed beyond the nervous system and contribute to regulation of essential cell functions such as cell migration, proliferation, and adhesion. Binding of semaphorins to their receptors, including plexins and neuropilins, triggers diverse signaling pathways which are involved in the pathogenesis of various diseases from cancer to autoimmune and allergic disorders...
August 17, 2017: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/28792859/elucidating-the-role-of-plexin-d1-in-body-fat-distribution-and-susceptibility-to-metabolic-disease-using-a-zebrafish-model-system
#9
James E N Minchin, John F Rawls
Non-communicable diseases (NCDs) such as cardiovascular disease, diabetes and cancer were responsible for 68% of all deaths worldwide in 2012. The regional distribution of lipid deposited within adipose tissue (AT) - so called body fat distribution (BFD) - is a strong risk factor for NCDs. BFD is highly heritable; however, the genetic basis of BFD is almost entirely unknown. Genome-wide association studies have identified several loci associated with BFD, including at Plexin D1 (PLXND1) - a gene known to modulate angiogenesis...
July 27, 2017: Adipocyte
https://www.readbyqxmd.com/read/28765893/endothelial-semaphorin-7a-promotes-seawater-aspiration-induced-acute-lung-injury-through-plexin-c1-and-%C3%AE-1-integrin
#10
Minlong Zhang, Xue Yan, Wei Liu, Ruilin Sun, Yonghong Xie, Faguang Jin
Inflammation and edema are two main characteristics in seawater aspiration‑induced acute lung injury (ALI). In a previous study of the authors, it was demonstrated that endothelial semaphorin 7A (SEMA7A) serves an important role in the development of seawater‑induced inflammation and edema. However, the mechanism of endothelial SEMA7A‑mediated ALI remains unclear. Therefore, the authors explored the effect of SEMA7A in rat pulmonary microvascular endothelial cells (RPMVECs) and the interaction between endothelial SEMA7A and alveolar macrophages during seawater aspiration‑induced ALI...
October 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28765520/semaphorin-4c-plexin-b2-signaling-in-peripheral-sensory-neurons-is-pronociceptive-in-a-model-of-inflammatory-pain
#11
Eszter Paldy, Manuela Simonetti, Thomas Worzfeld, Kiran Kumar Bali, Lucas Vicuña, Stefan Offermanns, Rohini Kuner
Semaphorins and their transmembrane receptors, Plexins, are key regulators of axon guidance and development of neuronal connectivity. B-type Plexins respond to Class IV semaphorins and mediate a variety of developmental functions. Here we report that the expression of Plexin-B2 and its high-affinity ligand, Sema4C, persists in peripheral sensory neurons in adult life and is markedly increased in states of persistent pain in mice. Genetic deletion of Sema4C as well as adult-onset loss of Plexin-B2 leads to impairment of the development and duration of inflammatory hypersensitivity...
August 2, 2017: Nature Communications
https://www.readbyqxmd.com/read/28760660/semaphorin4d-drives-cd8-t-cell-lesional-trafficking-in-oral-lichen-planus-via-cxcl9-cxcl10-upregulations-in-oral-keratinocytes
#12
Yao Ke, Erle Dang, Shengxian Shen, Tongmei Zhang, Hongjiang Qiao, Yuqian Chang, Qing Liu, Gang Wang
Chemokine mediated CD8(+) T cell recruitment is an essential but not well-established event for the persistence of oral lichen planus (OLP). Semaphorin 4D (Sema4D)/CD100 is implicated in immune dysfunction, chemokine modulation and cell migration, which are critical aspects for OLP progression, but its implication in OLP pathogenesis has not been determined. In this study, we sought to explicate the effect of Sema4D on human oral keratinocytes and its capacity to drive CD8(+) T cell lesional trafficking via chemokine modulation...
July 28, 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/28739743/role-of-plexin-b1-in-a-breast-cancer-cohort-of-pakistani-patients-and-its-contribution-towards-cancer-metastasis-as-indicated-by-an-in-vitro-model
#13
Muhammad Faraz Arshad Malik, Syeda Kiran Riaz, S H Waqar, Farhan Haq, Lin Ye, Wen G Jiang
BACKGROUND/AIM: In the current study, the role of plexin B1 in breast cancer metastasis was explored. MATERIALS AND METHODS: Freshly-excised tumours along with background tissues of affected patients (n=121) were collected from Pakistani hospitals and processed for RNA isolation and cDNA synthesis. Using quantitative polymerase chain reaction, expression of plexin B1 was evaluated and correlated with clinicopathological parameters. Furthermore, involvement of plexin B1 in metastasis was explored by generating gene knockdown in MDA-MB-231 and MCF-7 breast cancer cells...
August 2017: Anticancer Research
https://www.readbyqxmd.com/read/28689759/amplification-of-f-actin-disassembly-and-cellular-repulsion-by-growth-factor-signaling
#14
Jimok Yoon, Sang Bum Kim, Giasuddin Ahmed, Jerry W Shay, Jonathan R Terman
Extracellular cues that regulate cellular shape, motility, and navigation are generally classified as growth promoting (i.e., growth factors/chemoattractants and attractive guidance cues) or growth preventing (i.e., repellents and inhibitors). Yet, these designations are often based on complex assays and undefined signaling pathways and thus may misrepresent direct roles of specific cues. Here, we find that a recognized growth-promoting signaling pathway amplifies the F-actin disassembly and repulsive effects of a growth-preventing pathway...
July 24, 2017: Developmental Cell
https://www.readbyqxmd.com/read/28665070/identification-of-downstream-genes-of-the-mtor-pathway-that-predict-recurrence-and-progression-in-non-muscle-invasive-high-grade-urothelial-carcinoma-of-the-bladder
#15
Subin Jin, In Ho Chang, Jin Wook Kim, Young Mi Whang, Ha Jeong Kim, Soon Auck Hong, Tae Jin Lee
Microarray analysis was used to investigate the lack of identified mammalian target of rapamycin (mTOR) pathway downstream genes to overcome cross-talk at non-muscle invasive high-grade (HG)-urothelial carcinoma (UC) of the bladder, gene expression patterns, gene ontology, and gene clustering by triple (p70S6K, S6K, and eIF4E) small interfering RNAs (siRNAs) or rapamycin in 5637 and T24 cell lines. We selected mTOR pathway downstream genes that were suppressed by siRNAs more than 2-fold, or were up-regulated or down-regulated by rapamycin more than 2-fold...
August 2017: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/28656251/identification-of-a-gene-expression-profile-associated-with-the-regulation-of-angiogenesis-in-endometrial-cancer
#16
Marcin Opławski, Mateusz Michalski, Andrzej Witek, Bogdan Michalski, Nikola Zmarzły, Agnieszka Jęda-Golonka, Maria Styblińska, Joanna Gola, Małgorzata Kasprzyk-Żyszczyńska, Urszula Mazurek, Andrzej Plewka
The publication of the human genome sequence provided direction in the search for novel diagnostic and therapeutic methods for the treatment of human diseases. The aim of the present study was to investigate the hypothesis that the expression profile of genes involved in the regulation of angiogenesis may be a marker in endometrial cancer that facilitates the diagnosis and prognosis of patients, as well as the identification of novel therapeutic targets. The current study included 36 patients with grade (G) 1 to 3 endometrial cancer, and a control group of patients consisting of females that qualified for the removal of the uterus...
September 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28635959/optogenetic-activation-of-plexin-b1-reveals-contact-repulsion-between-osteoclasts-and-osteoblasts
#17
Abhijit Deb Roy, Taofei Yin, Shilpa Choudhary, Vladimir Rodionov, Carol C Pilbeam, Yi I Wu
During bone remodelling, osteoclasts induce chemotaxis of osteoblasts and yet maintain spatial segregation. We show that osteoclasts express the repulsive guidance factor Semaphorin 4D and induce contact inhibition of locomotion (CIL) in osteoblasts through its receptor Plexin-B1. To examine causality and elucidate how localized Plexin-B1 stimulation may spatiotemporally coordinate its downstream targets in guiding cell migration, we develop an optogenetic tool for Plexin-B1 designated optoPlexin. Precise optoPlexin activation at the leading edge of migrating osteoblasts readily induces local retraction and, unexpectedly, distal protrusions to steer cells away...
June 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28632130/the-laminar-organization-of-the-drosophila-ellipsoid-body-is-semaphorin-dependent-and-prevents-the-formation-of-ectopic-synaptic-connections
#18
Xiaojun Xie, Masashi Tabuchi, Matthew P Brown, Sarah P Mitchell, Mark N Wu, Alex L Kolodkin
The ellipsoid body (EB) in the Drosophila brain is a central complex (CX) substructure that harbors circumferentially laminated ring (R) neuron axons and mediates multifaceted sensory integration and motor coordination functions. However, what regulates R axon lamination and how lamination affects R neuron function remain unknown. We show here that the EB is sequentially innervated by small-field and large-field neurons and that early developing EB neurons play an important regulatory role in EB laminae formation...
June 20, 2017: ELife
https://www.readbyqxmd.com/read/28624895/semaphorin4d-plexinb1-signaling-attenuates-photoreceptor-outer-segment-phagocytosis-by-reducing-rac1-activity-of-rpe-cells
#19
Ayelen Bulloj, Arvydas Maminishkis, Masayuki Mizui, Silvia C Finnemann
Semaphorins form a family of secreted and membrane-bound molecules that were identified originally as axonal guidance factors during neuronal development. Given their wide distribution in many including mature tissues, semaphorin 4D (sema4D) and its main functional receptor plexin B1 (plxnB1) are expected to fulfill additional functions that remain to be uncovered. A main characteristic of the plexin receptor family is its ability to reorganize the cytoskeleton. PlxnB1 specifically may directly interact with Rho family GTPases to regulate F-actin driven pathways in cells in culture...
June 17, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28558017/a-dual-strategy-expression-screen-for-candidate-connectivity-labels-in-the-developing-thalamus
#20
Olivia Bibollet-Bahena, Tatsuya Okafuji, Karsten Hokamp, Guy Tear, Kevin J Mitchell
The thalamus or "inner chamber" of the brain is divided into ~30 discrete nuclei, with highly specific patterns of afferent and efferent connectivity. To identify genes that may direct these patterns of connectivity, we used two strategies. First, we used a bioinformatics pipeline to survey the predicted proteomes of nematode, fruitfly, mouse and human for extracellular proteins containing any of a list of motifs found in known guidance or connectivity molecules. Second, we performed clustering analyses on the Allen Developing Mouse Brain Atlas data to identify genes encoding surface proteins expressed with temporal profiles similar to known guidance or connectivity molecules...
2017: PloS One
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