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Xiaofang Jiang, Huiwu Li
The present study aimed to evaluate the role of leucine-rich repeats and immunoglobulin-like domain protein 1 (LRIG1) in the regulation of phosphatase and tensin homolog (PTEN) expression in esophageal carcinogenesis. LRIG1 was overexpressed in esophageal squamous cell carcinoma (ESCC) cell lines, and the effect of LRIG1 overexpression on the mRNA and protein expression levels of PTEN was evaluated by reverse transcription-quantitative polymerase chain reaction and western blotting. Furthermore, the effects of LRIG1 overexpression on the cell cycle distribution and apoptosis of ESCC cells were examined by flow cytometry...
October 2016: Experimental and Therapeutic Medicine
Uzma Malik, Aneela Javed
The human leucine-rich repeats and immunoglobulin like domains (LRIG) are evolutionary conserved family of single-pass transmembrane proteins. LRIG gene family includes three members, LRIG1 (formerly LIG1), LRIG2 and LRIG3, all of which are differentially expressed in human tissues and have long been proposed to be tumor suppressors. However, recently accumulated evidence on LRIG protein expression in human cancer appears to be inconsistent with this belief, as LRIG proteins have been found to be upregulated in certain tumors...
September 7, 2016: Current Cancer Drug Targets
Zhi-Yuan Deng, Yue-Hong Wang, Hong-Zhi Quan, Ou-Sheng Liu, Yi-Ping Li, Yuan Li, Wu Zhu, Krishna Munnee, Zhan-Gui Tang
Abnormal expression of microRNAs (miRNAs) is involved in the development of and anti‑apoptotic effects in various types of human cancer. However, miRNA‑mediated regulation of oral verrucous carcinoma (OVC) remains to be elucidated. The present study aimed to investigate the expression of miR‑181b in OVC and oral squamous cell carcinoma (OSCC). The expression levels of miR‑181b were determined using reverse transcription‑quantitative polymerase chain reaction. The expression levels of B‑cell lymphoma 2 (Bcl‑2) and leucine rich repeats and immunoglobulin like domains 1 (LRIG1), were evaluated using immunohistochemical staining...
October 2016: Molecular Medicine Reports
Jöri Pünchera, Laurent Barnes, Gürkan Kaya
BACKGROUND: Sebaceous glands contribute significantly to the barrier functions of the skin. However, little is known about their homeostasis and tumorigenesis. Recently, increased expression of stem cell marker Lrig1 has been reported in sebaceous carcinoma-like tumors of K14ΔNLef1 transgenic mice. In this study, we analyzed the Lrig1 expression in human sebaceous tumors. METHODS: Twenty-eight formalin-fixed paraffin-embedded sebaceous tumor specimens (7 sebaceous hyperplasias, 7 sebaceous adenomas, 10 sebaceomas and 4 sebaceous carcinomas) were stained with anti-Lrig1, anti-CD44v3 and anti-Ki67 antibody...
April 2016: Dermatopathology (Basel, Switzerland)
Shi-Qi Cheng, Heng-Yi Fan, Xin Xu, Wei-Wei Gao, Shi-Gang Lv, Min-Hua Ye, Miao-Jing Wu, Xiao-Li Shen, Zu-Jue Cheng, Xin-Gen Zhu, Yan Zhang
Pituitary adenomas (PAs) are well known as a common intracranial benign tumor, and a portion of PAs are refractory to current therapeutic methods. ErbB receptors family signaling pathway regulates the expression of PAs activation associated gene. Inhibition of epidermal growth factor receptor (EGFR) can inhibit proliferation of PAs. Leucine-rich repeats and immunoglobulin-like domains protein 1 ( LRIG1), a negative mediated gene of ErbB receptors family, plays a role in many tumors. However, there are seldom researches about the functional role of LRIG1 in PAs...
August 2016: Journal of Huazhong University of Science and Technology. Medical Sciences
G Jie, X Guozheng, L Ying, Z Yi, D Bo
OBJECTIVE: To analyze the expression of leucine-rich and immunoglobulin-like domain gene1 (LRIG1) in pituitary tumor and its clinical significance. PATIENTS AND METHODS: Patients were divided into two groups: hypophysoma group (n = 80) and normal group (normal brain tissue, n = 30). The immune tissue chemical streptavidin avidin-peroxidase was applied to detect the expression of LRIG1 of both groups and to analyze its relationship with the patients' prognosis. RESULTS: The positive expression rate of LRIG1 in normal brain tissues was significantly higher than that in pituitary adenomas (100% vs...
May 2016: European Review for Medical and Pharmacological Sciences
Hua Yang, Jun Yao, Jiangpin Yin, Xuan Wei
The leucine-rich repeats and immunoglobulin-like domains (LRIG) are used as tumor suppressors in clinical applications. Although the LRIG has been identified to manipulate the cell proliferation via various oncogenic receptor tyrosine kinases in diverse cancers, its role in multidrug resistance needs to be further elucidated, especially in human ovarian cancer. We herein established that the etoposide (VP16)-resistant SKOV3 human ovarian cancer cell clones (SKOV3/VP16 cells) and mRNA expression of LRIG1 were significantly reduced by the treatment of VP16 in a concentration-dependent manner...
May 2016: Cancer Biotherapy & Radiopharmaceuticals
X Wang, X J He, H Q Xu, Z W Chen, H H Fan
The aim of this study was to explore the inhibition of subcutaneously implanted human pituitary tumor cells in nude mice by LRIG1 and its mechanism. For this study, athymic nude mice were injected with either normal pituitary tumor RC-4B/C cells or LRIG1-transfected RC-4B/C cells. We then calculated the volume inhibition rate of the tumors, as well as the apoptosis index of tumor cells and the expression of Ras, Raf, AKt, and ERK mRNA in tumor cells. Tumor cell morphological and structural changes were also observed under electron microscope...
2016: Genetics and Molecular Research: GMR
Abhishek Tyagi, Kanchan Vishnoi, Sutapa Mahata, Gaurav Verma, Yogesh Srivastava, Shashank Masaldan, Bal Gangadhar Roy, Alok C Bharti, Bhudev C Das
PURPOSE: Perturbation of keratinocyte differentiation by E6/E7 oncoproteins of high-risk human papillomaviruses that drive oncogenic transformation of cells in squamocolumnar junction of the uterine cervix may confer "stem-cell like" characteristics. However, the crosstalk between E6/E7 and stem cell signaling during cervical carcinogenesis is not well understood. We therefore examined the role of viral oncoproteins in stem cell signaling and maintenance of stemness in cervical cancer...
August 15, 2016: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
Fernando Cruz Alsina, Francisco Javier Hita, Paula Aldana Fontanet, Dolores Irala, Håkan Hedman, Fernanda Ledda, Gustavo Paratcha
Even though many extracellular factors have been identified as promoters of general dendritic growth and branching, little is known about the cell-intrinsic modulators that allow neurons to sculpt distinctive patterns of dendrite arborization. Here, we identify Lrig1, a nervous system-enriched LRR protein, as a key physiological regulator of dendrite complexity of hippocampal pyramidal neurons. Lrig1-deficient mice display morphological changes in proximal dendrite arborization and defects in social interaction...
April 2016: EMBO Reports
M M Morrison, M M Williams, D B Vaught, D Hicks, J Lim, C McKernan, L Aurisicchio, G Ciliberto, C Simion, C Sweeney, R S Cook
No abstract text is available yet for this article.
March 3, 2016: Oncogene
S R Quist, M Eckardt, A Kriesche, H P Gollnick
BACKGROUND: Epidermal stem cells are multipotent cells that maintain the skin epidermis. Potential markers for stem cells have been identified in mammalian skin from mouse experiments; however, it is unclear if stem cells also contribute to tumour formation in human skin. OBJECTIVES: To investigate the expression of potential stem cell markers, such as leucine-rich repeat-containing G protein-coupled receptor (Lgr) 5, Lgr6, leucine-rich repeats and immunoglobulin-like domain protein 1 (Lrig1) and cytokeratin 15 (CK15) in basal cell carcinomas and tumours of the skin appendages...
September 2016: British Journal of Dermatology
Scooter Willis, Victor M Villalobos, Olivier Gevaert, Mark Abramovitz, Casey Williams, Branimir I Sikic, Brian Leyland-Jones
PURPOSE: To discover novel prognostic biomarkers in ovarian serous carcinomas. METHODS: A meta-analysis of all single genes probes in the TCGA and HAS ovarian cohorts was performed to identify possible biomarkers using Cox regression as a continuous variable for overall survival. Genes were ranked by p-value using Stouffer's method and selected for statistical significance with a false discovery rate (FDR) <.05 using the Benjamini-Hochberg method. RESULTS: Twelve genes with high mRNA expression were prognostic of poor outcome with an FDR <...
2016: PloS One
Yuzhi An, Zibo Zhao, Pengju Ou, Guangchuan Wang
Somatic mutations, which are associated with a certain rate of response to targeted therapies, are ubiquitously found in human non-small cell lung cancer (NSCLC). However, it is largely unknown which group of patients may benefit from the respective treatments targeting different somatic mutations. Therefore, more effective prognostic and predictive markers are desperately needed for the treatment of NSCLC harboring different somatic mutations. The leucine-rich repeats and immunoglobulin-like domains (LRIG)-1 is a tumor suppressor gene that belongs to the LRIG family...
November 2015: Medicine (Baltimore)
Peng-Yu Chang, Xing Jin, Yi-Yao Jiang, Li-Xian Wang, Yong-Jun Liu, Jin Wang
Intestinal stem cells are primitive cells found within the intestinal epithelium that play a central role in maintaining epithelial homeostasis through self-renewal and commitment into functional epithelial cells. Several markers are available to identify intestinal stem cells, such as Lgr5, CD24 and EphB2, which can be used to sort intestinal stem cells from mammalian gut. Here, we identify and isolate intestinal stem cells from C57BL/6 mice by using a cell surface antigen, CD44. In vitro, some CD44(+) crypt cells are capable of forming "villus-crypt"-like structures (organoids)...
May 2016: Cell and Tissue Research
Geraint J Parfitt, Behdad Kavianpour, Karen L Wu, Yilu Xie, Donald J Brown, James V Jester
PURPOSE: Currently, there are no definitive immunomarkers for epithelial stem cells (corneal and conjunctival) or their poorly understood niche microenvironment. The H2B-GFP/K5tTA mouse enables visualization of label-retaining cells (LRCs), which exhibit the functional marker of stem cell quiescence. We used immunofluorescence tomography to evaluate putative stem cell markers and LRCs of the mouse ocular surface. METHODS: H2B-GFP/K5tTA mice were pulsed for 56 days and then chased with doxycycline to label LRCs...
November 2015: Investigative Ophthalmology & Visual Science
James S Meabon, Rian de Laat, Katsuaki Ieguchi, Dmitry Serbzhinsky, Mark P Hudson, B Russel Huber, Jesse C Wiley, Mark Bothwell
Neurotrophins, essential regulators of many aspects of neuronal differentiation and function, signal via four receptors, p75, TrkA, TrkB and TrkC. The three Trk paralogs are members of the LIG superfamily of membrane proteins, which share extracellular domains consisting of leucine-rich repeat and C2 Ig domains. Another LIG protein, LINGO-1 has been reported to bind and influence signaling of p75 as well as TrkA, TrkB and TrkC. Here we examine the manner in which LINGO-1 influences the function of TrkA, TrkB and TrkC...
January 2016: Molecular and Cellular Neurosciences
N Yokdang, J Hatakeyama, J H Wald, C Simion, J D Tellez, D Z Chang, M M Swamynathan, M Chen, W J Murphy, K L Carraway Iii, C Sweeney
LRIG1 (leucine-rich repeat and immunoglobulin-like domain containing), a member of the LRIG family of transmembrane leucine-rich repeat-containing proteins, is a negative regulator of receptor tyrosine kinase signaling and a tumor suppressor. LRIG1 expression is broadly decreased in human cancer and in breast cancer and low expression of LRIG1 has been linked to decreased relapse-free survival. Recently, low expression of LRIG1 was revealed to be an independent risk factor for breast cancer metastasis and death...
June 2, 2016: Oncogene
Malin Lando, Christina S Fjeldbo, Saskia M Wilting, Barbara C Snoek, Eva-Katrine Aarnes, Malin F Forsberg, Gunnar B Kristensen, Renske Dm Steenbergen, Heidi Lyng
Loss of 3p11-p14 is a frequent event in epithelial cancer and a candidate prognostic biomarker in cervical cancer. In addition to loss, promoter methylation can participate in gene silencing and promote tumor aggressiveness. We have performed a complete mapping of promoter methylation at 3p11-p14 in two independent cohorts of cervical cancer patients (n = 149, n = 121), using Illumina 450K methylation arrays. The aim was to investigate whether hyperm-ethylation was frequent and could contribute to gene silencing and disease aggressiveness either alone or combined with loss...
2015: Epigenetics: Official Journal of the DNA Methylation Society
Kyle C Roche, Adam D Gracz, Xiao Fu Liu, Victoria Newton, Haruhiko Akiyama, Scott T Magness
BACKGROUND & AIMS: Reserve intestinal stem cells (rISCs) are quiescent/slowly cycling under homeostatic conditions, allowing for their identification with label-retention assays. rISCs mediate epithelial regeneration after tissue damage by converting to actively proliferating stem cells (aISCs) that self renew and demonstrate multipotency, which are defining properties of stem cells. Little is known about the genetic mechanisms that regulate the production and maintenance of rISCs. High expression levels of the transcription factor Sox9 (Sox9(high)) are associated with rISCs...
November 2015: Gastroenterology
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