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https://www.readbyqxmd.com/read/28337140/antioxidant-and-anti-tyrosinase-activities-of-phenolic-extracts-from-rape-bee-pollen-and-inhibitory-melanogenesis-by-camp-mitf-tyr-pathway-in-b16-mouse-melanoma-cells
#1
Liping Sun, Yan Guo, Yanxin Zhang, Yongliang Zhuang
Rape bee pollen possesses many nutritional and therapeutic properties because of its abundant nutrimental and bioactive components. In this study, free (FPE) and bound (BPE) phenolic extracts of rape bee pollen were obtained, phenolic and flavonoid contents were determined, and composition of phenolic acids was analyzed. In vitro antioxidant and anti-tyrosinase (TYR) activities of FPE and BPE were compared, and inhibitory melanogenesis of FPE was further evaluated. Results showed FPE and BPE contain total phenolic contents of 11...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28333235/ovarian-hormones-and-obesity
#2
Brigitte Leeners, Nori Geary, Philippe N Tobler, Lori Asarian
BACKGROUND: Obesity is caused by an imbalance between energy intake, i.e. eating and energy expenditure (EE). Severe obesity is more prevalent in women than men worldwide, and obesity pathophysiology and the resultant obesity-related disease risks differ in women and men. The underlying mechanisms are largely unknown. Pre-clinical and clinical research indicate that ovarian hormones may play a major role. OBJECTIVE AND RATIONALE: We systematically reviewed the clinical and pre-clinical literature on the effects of ovarian hormones on the physiology of adipose tissue (AT) and the regulation of AT mass by energy intake and EE...
March 2, 2017: Human Reproduction Update
https://www.readbyqxmd.com/read/28327432/feedback-from-arctic-charr-feed-flavour-stimulation-and-re-feeding-after-feed-deprivation-stimulate-genes-encoding-both-orexigenic-and-anorexigenic-neuropeptides
#3
Anja Striberny, Even H Jørgensen
Despite vast research attention, the knowledge about central mechanisms of appetite regulation in teleost remains inconclusive. A common strategy in studies on appetite regulating mechanisms is to measure the response to feed restriction or - deprivation, but responses vary between fish species and between experiments, and are also likely dependent on the degree of energy perturbation. The anadromous Arctic charr is an interesting model for studying appetite regulation as its feeding cycle comprises months of winter anorexia, and hyperphagia during summer...
March 18, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28324105/thyroid-hormone-dependent-epigenetic-regulation-of-melanocortin-4-receptor-levels-in-female-offspring-of-obese-rats
#4
T Tabachnik, T Kisliouk, A Marco, N Meiri, A Weller
Maternal obesity is a risk factor for offspring obesity. Melanocortin 4 receptor (Mc4r) is one of the mediators of food intake and energy balance. This study examines epigenetic mechanisms underlying altered Mc4r levels in the hypothalamic paraventricular nucleus in offspring of high-fat diet (HFD)-induced obese dams, and aims to elucidate the role of thyroid hormones in epigenetic regulation and tagging of their nucleosome at the Mc4r promoter. Female Wistar rats were fed HFD or chow from weaning through gestation and lactation...
January 9, 2017: Endocrinology
https://www.readbyqxmd.com/read/28323301/genetic-variation-of-the-bronze-locus-mc1r-in-turkeys-from-southern-brazil
#5
Josmael Corso, Diego Hepp, Mônica C Ledur, Jane O Peixoto, Nelson J R Fagundes, Thales R O Freitas
Domestic turkeys present several color phenotypes controlled by at least five genetic loci, but only one of these has been identified precisely: the bronze locus, which turned out to be the melanocortin-1 receptor (MC1R) gene. MC1R variation is important for breeders interested in maintaining or developing different color varieties. In this study, we sequenced most of the MC1R gene from 16 White Holland (the main commercial turkey variety) and 19 pigmented turkeys from southern Brazil with two purposes. The first was to describe the MC1R diversity in White Holland turkeys, which may serve as reservoirs of genetic diversity at this locus...
March 20, 2017: Genetics and Molecular Biology
https://www.readbyqxmd.com/read/28303974/antifibrotic-effect-of-pirfenidone-in-a-mouse-model-of-human-nonalcoholic-steatohepatitis
#6
Chikara Komiya, Miyako Tanaka, Kyoichiro Tsuchiya, Noriko Shimazu, Kentaro Mori, Shunsaku Furuke, Yasutaka Miyachi, Kumiko Shiba, Shinobu Yamaguchi, Kenji Ikeda, Kozue Ochi, Kazuhiko Nakabayashi, Ken-Ichiro Hata, Michiko Itoh, Takayoshi Suganami, Yoshihiro Ogawa
Non-alcoholic steatohepatitis (NASH) is characterized by steatosis with lobular inflammation and hepatocyte injury. Pirfenidone (PFD) is an orally bioavailable pyridone derivative that has been clinically used for the treatment of idiopathic pulmonary fibrosis. However, it remains unknown whether PFD improves liver fibrosis in a mouse model with human NASH-like phenotypes. In this study, we employed melanocortin 4 receptor-deficient (MC4R-KO) mice as a mouse model with human NASH-like phenotypes to elucidate the effect and action mechanisms of PFD on the development of NASH...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28294152/melanocortin-3-receptors-expressed-in-nkx2-1-ve-neurons-are-sufficient-for-controlling-appetitive-responses-to-hypocaloric-conditioning
#7
Clémence Girardet, Maria M Mavrikaki, Joseph R Stevens, Courtney A Miller, Daniel L Marks, Andrew A Butler
Melanocortin-3 receptors (MC3R) have a contextual role in appetite control that is amplified with hypocaloric conditioning. C57BL/6J (B6) mice subjected to hypocaloric feeding schedules (HFS) exhibit compulsive behavioral responses involving food anticipatory activity (FAA) and caloric loading following food access. These homeostatic responses to calorie-poor environs are attenuated in B6 mice in which Mc3r transcription is suppressed by a lox-stop-lox sequence in the 5'UTR (Mc3r(TB/TB)). Here, we report that optimization of caloric loading in B6 mice subject to HFS, characterized by increased meal size and duration, is not observed in Mc3r(TB/TB) mice...
March 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28292562/a-quantitative-analysis-of-multilineage-differentiating-stress-enduring-muse-cells-in-human-adipose-tissue-and-efficacy-of-melanocytes-induction
#8
Takeshi Yamauchi, Kenshi Yamasaki, Kenichiro Tsuchiyama, Saaya Koike, Setsuya Aiba
We have shown previously that multilineage-differentiating stress-enduring (Muse) cells in neonatal fibroblasts can differentiate into functional melanocytes. In this study, we quantitate Muse cells in adipose-mesenchymal stem cells (adipose-MSCs) of human subcutaneous tissue obtained from 11 subjects of various ages, and measured efficacy of melanocytes induction from Adipose-MSC-derived Muse cells (hASC-Muse cells). There was a statistically significant negative correlation between the age of donors and the numbers of adipose-MSCs recovered per g fat as well as the percentage of SSEA3+ cells in the adipose-MSC populations, but isolated hASC-Muse cells showed pluripotency and growth curves equally regardless the age of donors...
March 6, 2017: Journal of Dermatological Science
https://www.readbyqxmd.com/read/28284973/pharmacological-chaperones-for-the-misfolded-melanocortin-4-receptor-associated-with-human-obesity
#9
Hui Huang, Wei Wang, Ya-Xiong Tao
The melanocortin-4 receptor (MC4R) plays a vital role in regulating energy homeostasis. Mutations in the MC4R cause early-onset severe obesity. The majority of loss of function MC4R mutants are retained intracellularly, many of which are not terminally misfolded and can be stabilized and targeted to the plasma membrane by different chaperones. Some of the mutants might be functional once coaxed to the cell surface. Molecular chaperones and chemical chaperones correct the misfolding of some mutant MC4Rs. However, their therapeutic application is very limited due to their non-specific mechanism of action and, for chemical chaperone, high dosage needed to be effective...
March 8, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28275132/impact-of-polyunsaturated-and-saturated-fat-overfeeding-on-the-dna-methylation-pattern-in-human-adipose-tissue-a-randomized-controlled-trial
#10
Alexander Perfilyev, Ingrid Dahlman, Linn Gillberg, Fredrik Rosqvist, David Iggman, Petr Volkov, Emma Nilsson, Ulf Risérus, Charlotte Ling
Background: Dietary fat composition can affect ectopic lipid accumulation and, thereby, insulin resistance. Diets that are high in saturated fatty acids (SFAs) or polyunsaturated fatty acids (PUFAs) have different metabolic responses.Objective: We investigated whether the epigenome of human adipose tissue is affected differently by dietary fat composition and general overfeeding in a randomized trial.Design: We studied the effects of 7 wk of excessive SFA (n = 17) or PUFA (n = 14) intake (+750 kcal/d) on the DNA methylation of ∼450,000 sites in human subcutaneous adipose tissue...
March 8, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28274841/role-of-the-brain-melanocortins-in-blood-pressure-regulation
#11
Jussara M do Carmo, Alexandre A da Silva, Zhen Wang, Taolin Fang, Nicola Aberdein, Cecilia E Perez de Lara, John E Hall
Melanocortins play an important role in regulating blood pressure (BP) and sympathetic nervous system (SNS) activity as well as energy balance, glucose and other metabolic functions in humans and experimental animals. In experimental models of hypertension with high SNS activity, blockade of the melanocortin-4 receptor (MC4R) reduces BP despite causing marked hyperphagia and obesity. Activation of the central nervous system (CNS) pro-opiomelanocortin (POMC)-MC4R pathway appears to be an important link between obesity, SNS activation and hypertension...
March 6, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28273060/mc4r-dependent-suppression-of-appetite-by-bone-derived-lipocalin-2
#12
Ioanna Mosialou, Steven Shikhel, Jian-Min Liu, Antonio Maurizi, Na Luo, Zhenyan He, Yiru Huang, Haihong Zong, Richard A Friedman, Jonathan Barasch, Patricia Lanzano, Liyong Deng, Rudolph L Leibel, Mishaela Rubin, Thomas Nicholas, Wendy Chung, Lori M Zeltser, Kevin W Williams, Jeffrey E Pessin, Stavroula Kousteni
Bone has recently emerged as a pleiotropic endocrine organ that secretes at least two hormones, FGF23 and osteocalcin, which regulate kidney function and glucose homeostasis, respectively. These findings have raised the question of whether other bone-derived hormones exist and what their potential functions are. Here we identify, through molecular and genetic analyses in mice, lipocalin 2 (LCN2) as an osteoblast-enriched, secreted protein. Loss- and gain-of-function experiments in mice demonstrate that osteoblast-derived LCN2 maintains glucose homeostasis by inducing insulin secretion and improves glucose tolerance and insulin sensitivity...
March 16, 2017: Nature
https://www.readbyqxmd.com/read/28270253/genomic-differentiation-between-asturiana-de-los-valles-avile%C3%A3-a-negra-ib%C3%A3-rica-bruna-dels-pirineus-morucha-pirenaica-retinta-and-rubia-gallega-cattle-breeds
#13
A González-Rodríguez, S Munilla, E F Mouresan, J J Cañas-Álvarez, J A Baro, A Molina, C Díaz, J Altarriba, J Piedrafita, L Varona
The Spanish local beef cattle breeds have most likely common origin followed by a process of differentiation. This particular historical evolution has most probably left detectable signatures in the genome. The objective of this study was to identify genomic regions associated with differentiation processes in seven Spanish autochthonous populations (Asturiana de los Valles (AV), Avileña-Negra Ibérica (ANI), Bruna dels Pirineus (BP), Morucha (Mo), Pirenaica (Pi), Retinta (Re) and Rubia Gallega (RG)). The BovineHD 777K BeadChip was used on 342 individuals (AV, n=50; ANI, n=48; BP, n=50; Mo, n=50; Pi, n=48; Re, n=48; RG, n=48) chosen to be as unrelated as possible...
March 8, 2017: Animal: An International Journal of Animal Bioscience
https://www.readbyqxmd.com/read/28267582/melanocortin-4-receptor-ligands-modulate-energy-homeostasis-through-urocortin-1-neurons-of-the-centrally-projecting-edinger-westphal-nucleus
#14
Nóra Füredi, Ákos Nagy, Alexandra Mikó, Gergely Berta, Tamás Kozicz, Erika Pétervári, Márta Balaskó, Balázs Gaszner
The role of the urocortin 1 (Ucn1) expressing centrally projecting Edinger-Westphal (EWcp) nucleus in energy homeostasis and stress adaptation response has previously been investigated. Morphological and functional studies have proven that orexigenic and anorexigenic peptidergic afferents and receptors for endocrine messengers involved in the energy homeostasis are found in the EWcp. The central role of the hypothalamic melanocortin system in energy homeostasis is well known, however, no data have been published so far on possible crosstalk between melanocortins and EWcp-Ucn1...
March 3, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28264929/the-agouti-related-peptide-binds-heparan-sulfate-through-segments-critical-for-its-orexigenic-effects
#15
Rafael Palomino, Hsiau-Wei Lee, Glenn L Millhauser
Syndecans potently modulate agouti-related peptide (AgRP) signaling in the central melanocortin system. Through heparan sulfate moieties, syndecans are thought to anchor AgRP near its receptor, enhancing its orexigenic effects. Original work proposed that AgRP's N-terminal domain facilitates this interaction. However, this is not compatible with evidence that this domain is post-translationally cleaved. Addressing this long-standing incongruity, we used calorimetry and magnetic resonance to probe interactions of AgRP peptides with glycosaminoglycans including heparan sulfate...
March 6, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28259754/mc1r-signaling-intracellular-partners-and-pathophysiological-implications
#16
REVIEW
Cecilia Herraiz, Jose C Garcia-Borron, Celia Jiménez-Cervantes, Conchi Olivares
The melanocortin-1 receptor (MC1R) preferentially expressed in melanocytes is best known as a key regulator of the synthesis of epidermal melanin pigments. Its paracrine stimulation by keratinocyte-derived melanocortins also activates DNA repair pathways and antioxidant defenses to build a complex, multifaceted photoprotective response. Many MC1R actions rely on cAMP-dependent activation of two transcription factors, MITF and PGC1α, but pleiotropic MC1R signaling also involves activation of mitogen-activated kinases and AKT...
March 1, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28246458/associations-between-single-nucleotide-polymorphisms-in-multiple-candidate-genes-and-body-weight-in-rabbits
#17
Karim El-Sabrout, Sarah A Aggag
AIM: In this study, we examined parts of six growth genes (growth hormone [GH], melanocortin 4 receptor [MC4R], growth hormone receptor [GHR], phosphorglycerate mutase [PGAM], myostatin [MSTN], and fibroblast growth factor [FGF]) as specific primers for two rabbit lines (V-line, Alexandria) using nucleotide sequence analysis, to investigate association between detecting single nucleotide polymorphism (SNP) of these genes and body weight (BW) at market. MATERIALS AND METHODS: Each line kits were grouped into high and low weight rabbits to identify DNA markers useful for association studies with high BW...
January 2017: Veterinary World
https://www.readbyqxmd.com/read/28243712/altered-sucrose-self-administration-following-injection-of-melanocortin-receptor-agonists-and-antagonists-into-the-ventral-tegmental-area
#18
Laranci Shanmugarajah, Anna I Dunigan, Kyle J Frantz, Aaron G Roseberry
RATIONALE AND OBJECTIVES: Alpha-melanocyte stimulating hormone (αMSH) and agouti-related protein (AgRP) are antagonistic neuropeptides that play an important role in the control of feeding and body weight through their central actions on the melanocortin-3 and melanocortin-4 receptors. Increasing evidence indicates that αMSH and AgRP can interact with the mesolimbic dopamine system to regulate feeding as well as other behaviors. For example, we have shown previously that injection of melanocortin receptor agonists and antagonists into the ventral tegmental area (VTA) alters both normal home-cage feeding and the intake of sucrose solutions, but it remains unknown whether αMSH and AgRP can also act in the VTA to affect reward-related feeding...
February 27, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28242830/suppressed-sympathetic-outflow-to-skeletal-muscle-muscle-thermogenesis-and-activity-energy-expenditure-with-calorie-restriction
#19
Tariq I Almundarij, Chaitanya K Gavini, Colleen M Novak
During weight loss, adaptive thermogenesis occurs where energy expenditure (EE) is suppressed beyond that predicted for the smaller body size. Here, we investigated the contributions of resting and nonresting EE to the reduced total EE seen after 3 weeks of 50% calorie restriction (CR) in rats, focusing on activity-associated EE, muscle thermogenesis, and sympathetic outflow. Prolonged food restriction resulted in a 42% reduction in daily EE, through a 40% decrease in resting EE, and a 48% decline in nonresting EE These decreases in EE were significant even when the reductions in body weight and lean mass were taken into account...
February 2017: Physiological Reports
https://www.readbyqxmd.com/read/28241436/gomisin-n-inhibits-melanogenesis-through-regulating-the-pi3k-akt-and-mapk-erk-signaling-pathways-in-melanocytes
#20
Jae Kyoung Chae, Lalita Subedi, Minsun Jeong, Yong Un Park, Chul Young Kim, Hakwon Kim, Sun Yeou Kim
Gomisin N, one of the lignan compounds found in Schisandra chinensis has been shown to possess anti-oxidative, anti-tumorigenic, and anti-inflammatory activities in various studies. Here we report, for the first time, the anti-melenogenic efficacy of Gomisin N in mammalian cells as well as in zebrafish embryos. Gomisin N significantly reduced the melanin content without cellular toxicity. Although it was not capable of modulating the catalytic activity of mushroom tyrosinase in vitro, Gomisin N downregulated the expression levels of key proteins that function in melanogenesis...
February 22, 2017: International Journal of Molecular Sciences
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