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https://www.readbyqxmd.com/read/29138430/extracellular-vesicles-derived-from-mscs-activates-dermal-papilla-cell-in-vitro-and-promotes-hair-follicle-conversion-from-telogen-to-anagen-in-mice
#1
Ramya Lakshmi Rajendran, Prakash Gangadaran, Soon Sun Bak, Ji Min Oh, Senthilkumar Kalimuthu, Ho Won Lee, Se Hwan Baek, Liya Zhu, Young Kwan Sung, Shin Young Jeong, Sang-Woo Lee, Jaetae Lee, Byeong-Cheol Ahn
Hair loss is a common medical problem. In this study, we investigated the proliferation, migration, and growth factor expression of human dermal papilla (DP) cells in the presence or absence of treatment with mesenchymal stem cell extracellular vesicles (MSC-EVs). In addition, we tested the efficacy of MSC-EV treatment on hair growth in an animal model. MSC-EV treatment increased DP cell proliferation and migration, and elevated the levels of Bcl-2, phosphorylated Akt and ERK. In addition; DP cells treated with MSC-EVs displayed increased expression and secretion of VEGF and IGF-1...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29131315/txndc5-contributes-to-rheumatoid-arthritis-by-down-regulating-igfbp1-expression
#2
Jian Li, Bing Xu, Changsun Wu, Xinfeng Yan, Lei Zhang, Xiaotian Chang
The thioredoxin domain-containing 5 (TXNDC5) gene is associated with susceptibility to rheumatoid arthritis (RA) and exhibits increased expression in the synovial tissues. TXNDC5 is also strongly associated with diabetes, a metabolic disease characterized by interrupted insulin signaling. This study investigated whether TXNDC5 contributes to RA via the insulin signaling pathway. In the study, RA synovial fibroblast-like cells (RASFs) transfected with an anti-TXNDC5 small interfering RNA (siRNA) were analyzed with an Insulin Signaling Pathway RT(2) Profiler PCR Array and an Insulin Resistance RT(2) Profiler PCR Array...
November 13, 2017: Clinical and Experimental Immunology
https://www.readbyqxmd.com/read/29123118/substrate-microarchitecture-shapes-the-paracrine-crosstalk-of-stem-cells-with-endothelial-cells-and-osteoblasts
#3
Francisco Martín-Saavedra, Lara Crespo, Clara Escudero-Duch, Laura Saldaña, Enrique Gómez-Barrena, Nuria Vilaboa
We examined the hypothesis that substrate microarchitecture regulates the crosstalk between human mesenchymal stem cells (hMSC) and cell types involved in bone regeneration. Compared with polyester flat substrates having uniformly distributed homogenous pores (2D), three-dimensional polystyrene substrates with randomly oriented and interconnected pores of heterogeneous size (3D) stimulated the stromal secretion of IGF-1 while lessened the production of VEGFR-1, MCP-1 and IL-6. The medium conditioned by hMSC cultured in 3D substrates stimulated tube formation by human endothelial cells (hEC) to a higher extent than medium from 2D cultures...
November 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29089613/glp-1-and-igf-i-levels-are-elevated-in-late-infancy-in-low-birthweight-infants-independently-of-glp-1-receptor-polymorphisms-and-neonatal-nutrition
#4
M Díaz, C García-Beltran, A López-Bermejo, F de Zegher, L Ibáñez
Low birth weight followed by rapid postnatal weight gain is associated with increased risks for obesity and diabetes in adulthood. Modulation of glucagon-like-peptide 1 (GLP-1) secretion by (epi)genetic mechanisms or nutrition may influence in part this risk. Formula fed infants born small-for-gestational-age (SGA) have higher circulating GLP-1 at age 4 months than breastfed SGA or appropriate-for-gestational-age (AGA) infants. Here, we assessed GLP-1 concentrations in healthy AGA (n=149) and SGA (n=107) subjects at age 12 months, and their association with endocrine-metabolic and body composition parameters and GLP-1 receptor (GLP-1R) rs6923761 and rs3765467 polymorphisms...
November 1, 2017: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/29080813/arginine-reverses-growth-hormone-resistance-through-the-inhibition-of-toll-like-receptor-4-mediated-inflammatory-pathway
#5
Jingren Xu, Canjun Zhu, Mengyuan Zhang, Qingchun Tong, Xiaojuan Wan, Zhengrui Liao, Xingcai Cai, Yaqiong Xu, Yexian Yuan, Lina Wang, Xiaotong Zhu, Songbo Wang, Ping Gao, Qianyun Xi, Yong Xu, Qingyan Jiang, Gang Shu
OBJECTIVE: Growth hormone stimulates growth by increasing insulin-like growth factor 1 expression and secretion. In the presence of insufficient nutrients, GH increases, whereas IGF-1 expression becomes severely suppressed, leading to GH resistance. This study aimed to explore the effect of arginine (Arg) on GH resistance during malnutrition and to describe its underlying mechanism. METHODS: C57BL/6J mice were injected intraperitoneally with Arg for 1 h or subjected to caloric restriction with Arg supplement in drinking water for 18 days...
October 25, 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/29079753/norrin-protects-optic-nerve-axons-from-degeneration-in-a-mouse-model-of-glaucoma
#6
Stephanie A Leopold, Ludwig F Zeilbeck, Gregor Weber, Roswitha Seitz, Michael R Bösl, Herbert Jägle, Rudolf Fuchshofer, Ernst R Tamm, Andreas Ohlmann
Norrin is a secreted signaling molecule activating the Wnt/β-catenin pathway. Since Norrin protects retinal neurons from experimental acute injury, we were interested to learn if Norrin attenuates chronic damage of retinal ganglion cells (RGC) and their axons in a mouse model of glaucoma. Transgenic mice overexpressing Norrin in the retina (Pax6-Norrin) were generated and crossed with DBA/2J mice with hereditary glaucoma and optic nerve axonal degeneration. One-year old DBA/2J/Pax6-Norrin animals had significantly more surviving optic nerve axons than their DBA/2J littermates...
October 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29073599/combination-of-solamargine-and-metformin-strengthens-igfbp1-gene-expression-through-inactivation-of-stat3-and-reciprocal-interaction-between-foxo3a-and-sp1
#7
Qing Tang, Fang Zheng, JingJing Wu, Qian Xiao, Liuning Li, Swei Sunny Hann
BACKGROUND/AIMS: Solamargine, one natural photochemical component from traditional plants, has been shown to have anti-cancers properties. We previously showed that solamargine inhibited the growth of non-small-cell lung cancer (NSCLC) cells through suppression of prostaglandin E2 (PGE2) receptor EP4 gene and regulation of downstream signaling pathways. However, the detailed mechanism underlying this, especially in combination of metformin, a known AMPK activator, still remained to be determined...
October 27, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29072778/regulation-of-kisspeptin-synthesis-and-release-in-the-preoptic-anterior-hypothalamic-region-of-prepubertal-female-rats-actions-of-igf-1-and-alcohol
#8
Jill K Hiney, Vinod K Srivastava, Danielle N Vaden Anderson, Nicole L Hartzoge, William L Dees
Alcohol (ALC) causes suppressed secretion of prepubertal luteinizing hormone-releasing hormone (LHRH). Insulin-like growth factor-1 (IGF-1) and kisspeptin (Kp) are major regulators of LHRH and are critical for puberty. IGF-1 may be an upstream mediator of Kp in the preoptic area and rostral hypothalamic area (POA/RHA) of the rat brain, a region containing both Kp and LHRH neurons. We investigated the ability of IGF-1 to stimulate prepubertal Kp synthesis and release in POA/RHA, and the potential inhibitory effects of ALC METHODS: Immature female rats were administered either ALC (3g/Kg) or water via gastric gavage at 0730 h...
October 26, 2017: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/29067112/bone-marrow-mesenchymal-stem-cells-repair-the-hippocampal-neurons-and-increase-the-expression-of-igf-1-after-cardiac-arrest-in-rats
#9
Xiahong Tang, Feng Chen, Qinming Lin, Yan You, Jun Ke, Shen Zhao
The present study aimed to investigate the beneficial effects and underlying mechanisms of bone marrow mesenchymal stem cells (BMSCs) on global ischemic hypoxic brain injury. Cells collected from the femurs and tibias of male Sprague Dawley rats were used to generate BMSCs following three culture passages. A rate model of cardiac arrest (CA) was induced by asphyxia. One hour following return of spontaneous circulation (ROSC), BMSCs were transplanted through injection into the tail vein. Neurological status was assessed using modified neurological severity score (mNSS) tests 1, 3 and 7 days following ROSC...
November 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29063103/influence-of-insulin-on-growth-hormone-secretion-level-and-growth-hormone-signalling
#10
Han Qiu, Jin-Kui Yang, Chen Chen
Growth hormone (GH), as a vital hormone, has to experience a series of processes to fulfill its function including secretion, entering the circulation to reach target tissues (pre-receptor process), binding on the GH receptor (GHR) and triggering signaling inside cells (post-GHR process). Insulin can directly or indirectly influence part of these processes. GH secretion from pituitary somatotropes is regulated by GH-releasing hormone (GHRH) and somatostatin (SS) from hypothalamus. Insulin may exert positive or negative effects on the neurons expressing GHRH and SS and somatotropes under healthy and pathological conditions including obesity and diabetes...
October 25, 2017: Sheng Li Xue Bao: [Acta Physiologica Sinica]
https://www.readbyqxmd.com/read/29039467/insulin-like-growth-factor-binding-protein-6-released-from-human-mesenchymal-stem-cells-confers-neuronal-protection-through-igf-1r-mediated-signaling
#11
Hyo-Jin Jeon, Jihye Park, Joo-Hyun Shin, Mi-Sook Chang
Human bone marrow‑derived mesenchymal stem cells (hMSCs) are a desirable cell source for cell‑based therapy to treat nervous system injuries due to their ability to differentiate into specific cell types. In addition to their multipotency, hMSCs render the tissue microenvironment more favorable for tissue repair by secreting various growth factors. Our previous study demonstrated that hMSCs secrete several growth factors, including several insulin‑like growth factor binding proteins (IGFBPs). Among these, IGFBP‑6 binds with high affinity and inhibits insulin growth factor‑2 (IGF‑2) to inhibit the growth of IGF‑2‑dependent tumors...
October 5, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29038353/cell-cycle-dependent-expression-of-the-cck2-receptor-by-gastrointestinal-myofibroblasts-putative-role-in-determining-cell-migration
#12
Akos Varga, Jothi Dinesh Kumar, Alec W M Simpson, Steven Dodd, Peter Hegyi, Graham J Dockray, Andrea Varro
The well-known action of the gastric hormone gastrin in stimulating gastric acid secretion is mediated by activation of cholecystokinin-2 receptors (CCK2R). The latter are expressed by a variety of cell types suggesting that gastrin is implicated in multiple functions. During wound healing in the stomach CCK2R may be expressed by myofibroblasts. We have now characterized CCK2R expression in cultured myofibroblasts. Immunocytochemistry showed that a relatively small proportion (1-6%) of myofibroblasts expressed the receptor regardless of the region of the gut from which they were derived, or whether from cancer or control tissue...
October 2017: Physiological Reports
https://www.readbyqxmd.com/read/29031906/suckling-induced-insulin-like-growth-factor-1-igf-1-release-in-mother-rats
#13
András H Lékó, Melinda Cservenák, Árpád Dobolyi
OBJECTIVE: Lactation involves significant neuroendocrine changes. The elevated prolactin (PRL) release from the pituitary, induced markedly by suckling, is the most relevant example. Suckling also causes a significant and rapid elevation in growth hormone (GH) levels. GH is necessary for milk synthesis as milk yield is stopped completely in the absence of PRL and GH, while the absence of PRL alone causes only a 50% reduction. Insulin-like growth factor-1 (IGF-1) plays an important role in the GH axis...
October 10, 2017: Growth Hormone & IGF Research
https://www.readbyqxmd.com/read/29029025/insulin-deficient-mouse-%C3%AE-cells-do-not-fully-mature-but-can-be-remedied-through-insulin-replacement-by-islet-transplantation
#14
Adam Ramzy, Majid Mojibian, Timothy J Kieffer
Insulin receptor insufficiency in β-cells leads to impaired insulin secretion and reduced β-cell hyperplasia in response to hyperglycemia. Selective insulin receptor deficiency in β-cells in later embryological development may lead to compensatory β-cell hyperplasia. Though these findings suggest insulin signaling on the β-cell is important for β-cell function, they are confounded by loss of signaling by the IGFs through the insulin receptor. To determine if insulin itself is necessary for β-cell development and maturation, we performed a characterization of pancreatic islets in mice with deletions of both non-allelic insulin genes (Ins1-/-Ins2-/-)...
September 27, 2017: Endocrinology
https://www.readbyqxmd.com/read/29028997/serum-quantitative-proteomic-analysis-reveals-soluble-egfr-to-be-a-marker-of-insulin-resistance-in-male-mice-and-humans
#15
Mayu Kyohara, Jun Shirakawa, Tomoko Okuyama, Ayuko Kimura, Yu Togashi, Kazuki Tajima, Hisashi Hirano, Yasuo Terauchi
To identify circulating factors as candidates involved in type 2 diabetes (T2DM), we conducted two different quantitative proteomic analyses: 1) db/db mouse sera were compared with db/+ mouse sera obtained at 4, 8, 12, and 24 weeks of age, and 2) db/db mouse sera from animals treated with liraglutide were compared with sera from animals without liraglutide treatment. 20 and eight proteins were differentially expressed in db/db mouse sera in the first experiment and in db/db mouse sera after liraglutide treatment in the second experiment, respectively...
October 5, 2017: Endocrinology
https://www.readbyqxmd.com/read/29027568/-diagnostics-and-treatment-of-acromegaly-necessity-for-targeted-monitoring-of-comorbidities
#16
S Petersenn, M Christ-Crain, M Droste, R Finke, J Flitsch, I Kreitschmann-Andermahr, A Luger, J Schopohl, G Stalla
Acromegaly is a rare and severe condition, presenting with typical signs and symptoms. The diagnosis is often initially made years after the first manifestations of the disease. In more than 99% of patients the disease is caused by a benign pituitary tumor that secretes growth hormone (GH). The diagnosis is based on the presence of increased insulin-like growth factor 1 (IGF-1) levels and a lack of GH suppression in the oral glucose tolerance test. The standard imaging procedure for tumor detection is magnetic resonance imaging in the region of the sella turcica...
November 2017: Der Internist
https://www.readbyqxmd.com/read/29025428/compound-heterozygosity-for-two-ghr-missense-mutations-in-a-patient-affected-by-laron-syndrome-a-case-report
#17
Stefania Moia, Daniele Tessaris, Silvia Einaudi, Luisa de Sanctis, Gianni Bona, Simonetta Bellone, Flavia Prodam
BACKGROUND: Mutations localized in the Growth Hormone Receptor (GHR) gene are often associated with the pathogenesis of Laron Syndrome, an autosomal recessive hereditary disorder characterized by severe growth retardation. Biochemically, patients present normal to high circulating GH levels, in presence of very low or undetectable IGF-I levels, which do not rise after rhGH treatment. CASE PRESENTATION: We describe the case of a 3.8 years old girl with symmetrical short stature (-3...
October 12, 2017: Italian Journal of Pediatrics
https://www.readbyqxmd.com/read/28989976/hematopoietic-stem-cell-derived-adipocytes-promote-tumor-growth-and-cancer-cell-migration
#18
Y Xiong, D L Russell, L T McDonald, L A Cowart, A C LaRue
Adipocytes, apart from their critical role as the energy storage depots, contribute to the composition of the tumor microenvironment. Our previous studies based on a single hematopoietic stem cell (HSC) transplantation model, have revealed a novel source of adipocytes from HSCs via monocyte/macrophage progenitors. Herein, we extend these studies to examine the role of HSC-derived adipocytes (HSC-Ad) in tumor progression. When cultured under adipogenic conditions, bone marrow-derived monocytic progenitors differentiated into adipocytes that accumulated oil droplets containing triglyceride...
2017: International Journal of Cancer Research and Molecular Mechanisms
https://www.readbyqxmd.com/read/28986927/effects-of-phyto-oestrogen-quercetin-on-productive-performance-hormones-reproductive-organs-and-apoptotic-genes-in-laying-hens
#19
J X Yang, M T Chaudhry, J Y Yao, S N Wang, B Zhou, M Wang, C Y Han, Y You, Y Li
Quercetin, a polyphenolic flavonoid with diverse biological activities including anti-inflammatory and antiviral, inhibits lipid peroxidation, prevents oxidative injury and cell death. The purpose of the research was to investigate the effect of quercetin on productive performance, reproductive organs, hormones and apoptotic genes in laying hens between 37 and 45 weeks of age, because of the structure and oestrogenic activities similar to 17β-oestradiol. The trial was conducted using 240 Hessian laying hens (37 weeks old), housed in wire cages with two hens in each cage...
October 6, 2017: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/28960620/igf-1-promotes-angiogenesis-in-endothelial-cells-adipose-derived-stem-cells-co-culture-system-with-activation-of-pi3k-akt-signal-pathway
#20
Shiyu Lin, Qi Zhang, Xiaoru Shao, Tao Zhang, Changyue Xue, Sirong Shi, Dan Zhao, Yunfeng Lin
OBJECTIVES: The aim of this study was to investigate the role of insulin-like growth factor-1 (IGF-1) and crosstalk between endothelial cells (ECs) and adipose-derived stem cells (ASCs) in the process of angiogenesis. METHODS: A three-dimensional collagen gel used to culture mouse ASCs and mouse ECs in vitro was established. The effects of angiogenesis after exposure to IGF-1 were observed by confocal laser scanning microscopy. Western blotting and qPCR were performed to elucidate the underlying mechanisms...
September 27, 2017: Cell Proliferation
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