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Growth Hormone Releasing Peptides

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https://www.readbyqxmd.com/read/28633506/role-of-glucagon-like-peptide-1and-gastric-inhibitory-peptide-in-anorexia-induction-following-oral-exposure-to-the-trichothecene-mycotoxin-deoxynivalenol-vomitoxin
#1
Hui Jia, Wen-Da Wu, Xi Lu, Jie Zhang, Cheng-Hua He, Hai-Bin Zhang
Deoxynivalenol (DON), which is a Type B trichothecene mycotoxin produced by Fusarium, frequently contaminates cereal staples, such as wheat, barley and corn. DON threatens animal and human health by suppressing food intake and impairing growth. While anorexia induction in mice exposed to DON has been linked to the elevation of the satiety hormones cholecystokinin (CCK) and peptide YY3-36(PYY3-36) in plasma, the effects of DON on the release of other satiety hormones, such as glucagon-like peptide-1 (GLP-1) and gastric inhibitory peptide (GIP), have not been established...
June 19, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28623445/laparoscopic-sleeve-gastrectomy-resolves-low-ghrp-2-stimulated-growth-hormone-levels-in-obese-patients
#2
Emi Ohara, Hirotake Tokuyama, Takumi Kitamoto, Aya Kitahara, Aiko Hayashi, Hideki Hayashi, Minoru Takemoto, Koutaro Yokote
Because growth hormone (GH) secretion is reportedly decreased in obese patients, we examined not only the factors associated with the decreased GH secretion but also GH response to the GH-releasing peptide (GHRP)-2-load test before and after laparoscopic gastrectomy (LSG). The study comprised 28 individuals aged 19-65 years [mean body mass index (BMI), 39.4 ± 9.4 kg/m(2)]. In the univariate analysis, GH secretion peaks correlated negatively with BMI (r = -0.59, p = 0.001), visceral adipose tissue (r = -0...
June 16, 2017: Obesity Surgery
https://www.readbyqxmd.com/read/28621684/expression-of-hypothalamic-neurohormones-and-their-receptors-in-the-human-eye
#3
Sander R Dubovy, Maria P Fernandez, Jose J Echegaray, Norman L Block, Noriyuki Unoki, Roberto Perez, Irving Vidaurre, Richard K Lee, Mehrdad Nadji, Andrew V Schally
Extrapituitary roles for hypothalamic neurohormones have recently become apparent and clinically relevant, based on the use of synthetic peptide analogs for the treatment of multiple conditions including cancers, pulmonary edema and myocardial infarction. In the eye, it has been suggested that some of these hormones and their receptors may be present in the ciliary body, iris, trabecular meshwork and retina, but their physiological role has yet to be elucidated. Our study intends to comprehensively demonstrate the expression of some hypothalamic neuroendocrine hormones and their receptors within different retinal and extraretinal structures of the human eye...
June 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/28598597/azapeptide-synthesis-methods-for-expanding-side-chain-diversity-for-biomedical-applications
#4
Ramesh Chingle, Caroline Proulx, William D Lubell
Mimicry of bioactive conformations is critical for peptide-based medicinal chemistry because such peptidomimetics may augment stability, enhance affinity, and increase specificity. Azapeptides are peptidomimetics in which the α-carbon(s) of one or more amino acid residues are substituted by nitrogen. The resulting semicarbazide analogues have been shown to reinforce β-turn conformation through the combination of lone pair-lone pair repulsion of the adjacent hydrazine nitrogen and urea planarity. Substitution of a semicarbazide for an amino amide residue in a peptide may retain biological activity and add benefits such as improved metabolic stability...
June 9, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28561845/dynamic-properties-of-the-growth-hormone-releasing-hormone-receptor-ghrhr-and-molecular-determinants-of-ghrh-binding
#5
M-T Matsoukas, G A Spyroulias
The growth hormone-releasing hormone receptor (GHRHR) is a member of the class B GPCR subfamily. GHRH, a 44-residue neuropeptide produced in the hypothalamus, regulates the secretion of growth hormone through its binding to GHRHR. It has recently been associated with several types of cancer such as prostate, breast, pancreatic and ovarian cancer. Family B GPCR peptides bind in a two-step model, where first the C-terminal region of the peptide interacts with the extracellular domain (ECD) of the receptor and subsequently, the N-terminal interacts with the seven transmembrane domain (TMD), resulting in activation...
May 31, 2017: Molecular BioSystems
https://www.readbyqxmd.com/read/28516374/role-of-lps-elicited-signaling-in-triggering-gastric-mucosal-inflammatory-responses-to-h-pylori-modulatory-effect-of-ghrelin
#6
REVIEW
B L Slomiany, A Slomiany
Infection with Helicobacter pylori is a primary culprit in the etiology of gastric disease, and its cell-wall lipopolysaccharide (LPS) is recognized as a potent endotoxin responsible for triggering a pattern of the mucosal inflammatory responses. The engagement by the LPS of gastric mucosal Toll-like receptor 4 (TLR4) leads to initiation of signal transduction events characterized by the activation of mitogen-activated protein kinase (MAPK) cascade, induction of phosphoinositide-specific phospholipase C (PLC)/protein kinase C (PKC)/phosphatidylinositol 3-kinase (PI3K) pathway, and up-regulation in Src/Akt...
May 17, 2017: Inflammopharmacology
https://www.readbyqxmd.com/read/28503900/effects-of-in-ovo-feeding-of-l-arginine-on-the-development-of-digestive-organs-intestinal-function-and-post-hatch-performance-of-broiler-embryos-and-hatchlings
#7
T Gao, M M Zhao, Y J Li, L Zhang, J L Li, L L Yu, F Gao, G H Zhou
This study was to investigate the effects of in ovo feeding (IOF) L-arginine (Arg) solution on the development of digestive organs, the duodenal mucosa of broiler embryos and hatchlings, and the growth performance of chicks during the first week post-hatch. A total of 720 fertilized eggs with similar weight were randomly allocated to three groups, consisting of eight replicates of 30 eggs each. Three treatments were arranged as non-injected control, diluent-injected (0.75% NaCl solution) group and Arg solution-injected group containing 1% Arg, dissolved in diluent...
May 15, 2017: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/28469491/synthetic-growth-hormone-releasing-peptides-ghrps-a-historical-appraisal-of-the-evidences-supporting-their-cytoprotective-effects
#8
REVIEW
Jorge Berlanga-Acosta, Angel Abreu-Cruz, Diana García-Del Barco Herrera, Yssel Mendoza-Marí, Arielis Rodríguez-Ulloa, Ariana García-Ojalvo, Viviana Falcón-Cama, Francisco Hernández-Bernal, Qu Beichen, Gerardo Guillén-Nieto
BACKGROUND: Growth hormone-releasing peptides (GHRPs) constitute a group of small synthetic peptides that stimulate the growth hormone secretion and the downstream axis activity. Mounting evidences since the early 1980s delineated unexpected pharmacological cardioprotective and cytoprotective properties for the GHRPs. However, despite intense basic pharmacological research, alternatives to prevent cell and tissue demise before lethal insults have remained as an empty niche in the clinical armamentarium...
2017: Clinical Medicine Insights. Cardiology
https://www.readbyqxmd.com/read/28461507/evolutionarily-conserved-trh-neuropeptide-pathway-regulates-growth-in-caenorhabditis-elegans
#9
Elien Van Sinay, Olivier Mirabeau, Geert Depuydt, Matthias Boris Van Hiel, Katleen Peymen, Jan Watteyne, Sven Zels, Liliane Schoofs, Isabel Beets
In vertebrates thyrotropin-releasing hormone (TRH) is a highly conserved neuropeptide that exerts the hormonal control of thyroid-stimulating hormone (TSH) levels as well as neuromodulatory functions. However, a functional equivalent in protostomian animals remains unknown, although TRH receptors are conserved in proto- and deuterostomians. Here we identify a TRH-like neuropeptide precursor in Caenorhabditis elegans that belongs to a bilaterian family of TRH precursors. Using CRISPR/Cas9 and RNAi reverse genetics, we show that TRH-like neuropeptides, through the activation of their receptor TRHR-1, promote growth in Celegans TRH-like peptides from pharyngeal motor neurons are required for normal body size, and knockdown of their receptor in pharyngeal muscle cells reduces growth...
May 16, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28420089/suppression-of-ghs-r-in-agrp-neurons-mitigates-diet-induced-obesity-by-activating-thermogenesis
#10
Chia-Shan Wu, Odelia Y N Bongmba, Jing Yue, Jong Han Lee, Ligen Lin, Kenji Saito, Geetali Pradhan, De-Pei Li, Hui-Lin Pan, Allison Xu, Shaodong Guo, Yong Xu, Yuxiang Sun
Ghrelin, an orexigenic hormone released primarily from the gut, signals the hypothalamus to stimulate growth hormone release, enhance appetite and promote weight gain. The ghrelin receptor, aka Growth Hormone Secretagogue Receptor (GHS-R), is highly expressed in the brain, with highest expression in Agouti-Related Peptide (AgRP) neurons of the hypothalamus. We recently reported that neuron-specific deletion of GHS-R completely prevents diet-induced obesity (DIO) in mice by activating non-shivering thermogenesis...
April 14, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28400207/the-safety-and-efficacy-of-growth-hormone-secretagogues
#11
REVIEW
John T Sigalos, Alexander W Pastuszak
INTRODUCTION: Growth hormone (GH) increases lean body mass, decreases fat mass, increases exercise tolerance and maximum oxygen uptake, enhances muscle strength, and improves linear growth. Long-term studies of GH administration offer conflicting results on its safety, which has led to strict Food and Drug Administration criteria for GH use. The potential drawbacks of exogenous GH use are believed to be due in part to impaired regulatory feedback. AIM: To review the literature on GH secretagogues (GHSs), which include GH-releasing peptides and the orally available small-molecule drug ibutamoren mesylate...
April 8, 2017: Sexual Medicine Reviews
https://www.readbyqxmd.com/read/28347187/second-trimester-amniotic-fluid-corticotropin-releasing-hormone-and-urocortin-in-relation-to-maternal-stress-and-fetal-growth-in-human-pregnancy
#12
Pearl La Marca-Ghaemmaghami, Sara M Dainese, Günter Stalla, Marina Haller, Roland Zimmermann, Ulrike Ehlert
This study explored the association between the acute psychobiological stress response, chronic social overload and amniotic fluid corticotropin-releasing hormone (CRH) and urocortin (UCN) in 34 healthy, second-trimester pregnant women undergoing amniocentesis. The study further examined the predictive value of second-trimester amniotic fluid CRH and UCN for fetal growth and neonatal birth outcome. The amniocentesis served as a naturalistic stressor, during which maternal state anxiety and salivary cortisol was measured repeatedly and an aliquot of amniotic fluid was collected...
April 21, 2017: Stress: the International Journal on the Biology of Stress
https://www.readbyqxmd.com/read/28336086/incretin-hormones-regulate-microglia-oxidative-stress-survival-and-expression-of-trophic-factors
#13
Lindsay Joy Spielman, Deanna Lynn Gibson, Andis Klegeris
The incretin hormones glucagon-like peptide (GLP)-1 and glucose-dependent insulinotropic polypeptide (GIP) are primarily known for their metabolic function in the periphery. GLP-1 and GIP are secreted by intestinal endocrine cells in response to ingested nutrients. Both GLP-1 and GIP stimulate the production and release of insulin from pancreatic β cells as well as exhibit several growth-regulating effects on peripheral tissues. GLP-1 and GIP are also present in the brain, where they provide modulatory and anti-apoptotic signals to neurons...
March 8, 2017: European Journal of Cell Biology
https://www.readbyqxmd.com/read/28321024/the-growth-hormone-secretagogue-hexarelin-protects-rat-cardiomyocytes-from-in-vivo-ischemia-reperfusion-injury-through-interleukin-1-signaling-pathway
#14
Jiannan Huang, Yi Li, Juan Zhang, Yusheng Liu, Qinghua Lu
Hexarelin, a synthetic growth hormone-releasing peptide, has been proven to possess cardioprotective actions through its binding to the growth hormone secretagogue receptor (GHSR) 1a and the non-GHSR receptor CD36. However, its effect on myocardial ischemia/reperfusion (I/R) injury has not been fully clarified in vivo. We aimed to determine whether hexarelin treatment could protect cardiomyocytes from I/R injury and to examine the underlying mechanisms. In vivo hearts of male SD rats underwent 30 minutes of ischemia by left coronary artery ligation followed by reperfusion...
April 6, 2017: International Heart Journal
https://www.readbyqxmd.com/read/28257082/the-effect-of-lupinus-albus-on-growth-performance-body-composition-and-satiety-hormones-of-male-pigs-immunized-against-gonadotrophin-releasing-factor
#15
Karen Moore, Bruce Mullan, Jae Cheol Kim, Frank Dunshea
Two hundred and ninety four pigs were used with the aim to develop a dietary management strategy using Lupinus albus L. (albus lupins) to reduce the increase in feed intake and subsequent increase in carcass fatness in pigs immunized against gonadotrophin releasing factor (immunocastrates; IC males) and entire male pigs in the late finishing stage. From day (d) 0 to 28, IC males fed the control diet grew faster (p = 0.009) than entire males fed the control diet but there was no difference in growth rate between sexes for pigs fed albus lupins for 14 days pre-slaughter (Albus 14) or pigs fed albus lupins for 28 days pre-slaughter (Albus 28)...
March 2, 2017: Animals: An Open Access Journal From MDPI
https://www.readbyqxmd.com/read/28249734/role-of-brain-derived-neurotrophic-factor-and-nerve-growth-factor-in-the-regulation-of-neuropeptide-w-in%C3%A2-vitro-and-in%C3%A2-vivo
#16
Rikang Wang, Fengxia Yan, Rifang Liao, Pei Wan, Peter J Little, Wenhua Zheng
Nerve growth factor (NGF) and Brain-derived neurotrophic factor (BDNF) are neurotrophic factors involved in the growth, survival and functioning of neurons. In addition, a possible role of neurotrophins, particularly BDNF, in HPA axis hyperactivation has recently been proposed. Neuropeptide W (NPW) is an endogenous peptide ligand for the GPR7 and GPR8 and a stress mediator in the hypothalamus. It activates the HPA axis by working on hypothalamic corticotrophin-releasing hormone (CRH). No information is available about the interrelationships between neurotrophines like NGF/BDNF and NPW...
February 27, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28240193/crh-receptors-in-human-reproduction
#17
Antonis Makrigiannakis, Thomas Vrekoussis, Emmanouel Zoumakis, Iordanis Navrozoglou, Sophia Kalantaridou
Corticotropin releasing hormone (CRH), the main peptide-mediator of stress, has been found in the female reproductive system. Herein, the role of CRH receptors in the female reproductive sysem is presented. It is clear that CRH receptors are involved in the regulation of the hypothalamic-pituitary-ovarian axis, while locally are associated with decidualization, embryonic implantation, early fetal development and triggering of parturition. Abnormal CRH signalling may contribute to obstetrical pathophysiology, such as pre-eclampsia, abnormal placenta invasion, endometrial growth retardation and preterm delivery...
February 23, 2017: Current Molecular Pharmacology
https://www.readbyqxmd.com/read/28238732/ghrelin-and-cancer-progression
#18
REVIEW
Tsung-Chieh Lin, Michael Hsiao
Ghrelin is a small peptide with 28 amino acids, and has been characterized as the ligand of the growth hormone secretagogue receptor (GHSR). In addition to its original function in stimulating pituitary growth hormone release, ghrelin is multifunctional and plays a role in the regulation of energy balance, gastric acid release, appetite, insulin secretion, gastric motility and the turnover of gastric and intestinal mucosa. The discovery of ghrelin and GHSR expression beyond normal tissues suggests its role other than physiological function...
February 24, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28222044/endocrine-system-on-chip-for-a-diabetes-treatment-model
#19
Dao Thi Thuy Nguyen, Danny van Noort, In-Kyung Jeong, Sungsu Park
The endocrine system is a collection of glands producing hormones which, among others, regulates metabolism, growth and development. One important group of endocrine diseases is diabetes, which is caused by a deficiency or diminished effectiveness of endogenous insulin. By using a microfluidic perfused 3D cell-culture chip, we developed an 'endocrine system on chip' to potentially be able to screen drugs for the treatment of diabetes by measuring insulin release over time. Insulin-secreting β-cells are located in the pancreas, while L-cells, located in the small intestines, stimulate insulin secretion...
February 21, 2017: Biofabrication
https://www.readbyqxmd.com/read/28150932/biomimetic-human-serum-albumin-nanoparticle-for-efficiently-targeting-therapy-to-metastatic-breast-cancers
#20
Lisha Liu, Yunke Bi, Muru Zhou, Xinli Chen, Xi He, Yujie Zhang, Tao Sun, Chunhui Ruan, Qingjun Chen, Hao Wang, Chen Jiang
Triple-negative breast cancers (TNBCs), devoid of hormone receptors and human epidermal growth-factor receptor-2/Neu expression, bring about poor prognosis and induce a high rate of systematic metastases. The ineffectiveness of current therapies on TNBCs could be attributed to the lack of efficient targeted therapy. Paclitaxel (PTX) is considered one of first-line chemotherapeutics for TNBC treatment but, due to its low aqueous solubility and nonspecific accumulation, results in poor antitumor efficacy. The present study is aimed at enhancing the chemotherapeutic potency of PTX by improving the stability and targeting efficiency of PTX-loaded nanoparticulate drug carriers...
March 1, 2017: ACS Applied Materials & Interfaces
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