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https://www.readbyqxmd.com/read/28803831/localization-of-connexin-43-gap-junctions-and-hemichannels-in-tanycytes-of-adult-mice
#1
Anett Szilvásy-Szabó, Edina Varga, Zsuzsa Beliczai, Ronald M Lechan, Csaba Fekete
Tanycytes are specialized glial cells lining the lateral walls and the floor of the third ventricle behind the optic chiasm. In addition to functioning as barrier cells, they also have an important role in the regulation of neuroendocrine axes and energy homeostasis. To determine whether tanycytes communicate with each other via Connexin 43 (Cx43) gap junctions, individual tanycytes were loaded with Lucifer yellow (LY) through a patch pipette. In all cases, LY filled a larger group of tanycytes as well as blood vessels adjacent to tanycyte processes...
August 10, 2017: Brain Research
https://www.readbyqxmd.com/read/28800500/sb223412-a-neurokinin-3-receptor-selective-antagonist-suppresses-testosterone-secretion-in-male-guinea-pigs
#2
Sho Nakamura, Yoshiko Ito, Koki Yamamoto, Chudai Takahashi, Mingdao Dai, Miyu Tanahashi, Yoshihisa Uenoyama, Hiroko Tsukamura, Shinya Oishi, Kei-Ichiro Maeda, Fuko Matsuda
Guinea pigs are important zoo animals and have been recommended for animal-assisted activities or therapy, however there are problems concerning testosterone inducing aggressive or sexual behaviors in male guinea pigs. Testicular testosterone secretion is regulated by pulsatile gonadotropin releasing hormone (GnRH)/luteinizing hormone (LH) release in mammals. The mechanism generating GnRH/LH pulses is thought to be governed by kisspeptin neurons, which coexpress neurokinin B (NKB) and dynorphin A (Dyn), in the arcuate nucleus (ARC)...
July 31, 2017: Theriogenology
https://www.readbyqxmd.com/read/28771698/molecular-and-functional-genetics-of-the-proopiomelanocortin-gene-food-intake-regulation-and-obesity
#3
REVIEW
Marcelo Rubinstein, Malcolm J Low
During the last decade, the obesity pandemia has skyrocketed, and the spectre is threatening children, adolescents and lower income families worldwide. Although driven by an increase in the consumption of ultra-processed edibles of poor nutritional value, the obesogenic changes in contemporary human lifestyle affect people differently, revealing that some individuals are more prone to developing increased adiposity. During the last years, we performed a variety of genetic, evolutionary, biochemical and behavioral experiments that allowed us to understand how a group of neurons present in the arcuate nucleus of the hypothalamus regulate the expression of the proopiomelanocortin (Pomc) gene and induce satiety...
August 3, 2017: FEBS Letters
https://www.readbyqxmd.com/read/28771488/maternal-obesity-programs-reduced-leptin-signaling-in-the-pituitary-and-altered-gh-igf1-axis-function-leading-to-increased-adiposity-in-adult-sheep-offspring
#4
Nuermaimaiti Tuersunjiang, John F Odhiambo, Desiree R Shasa, Ashley M Smith, Peter W Nathanielsz, Stephen P Ford
Studies in rodents highlight a role for leptin in stimulation of pituitary growth hormone (GH) secretion, with an impact on body composition regulation. We have reported that maternal obesity (MO) during ovine pregnancy results in hyperphagia, glucose-insulin dysregulation, increased adiposity, hypercortisolemia and hyperleptinemia in mature offspring subjected to a bout of ad libitum feeding. We hypothesized that MO reduces leptin signaling in the pituitary and down regulates the GH/IGF1 axis and increases circulating cortisol leading to increased adiposity in their adult offspring...
2017: PloS One
https://www.readbyqxmd.com/read/28762947/energy-imbalance-alters-ca-2-handling-and-excitability-of-pomc-neurons
#5
Lars Paeger, Andreas Pippow, Simon Hess, Moritz Paehler, Andreas C Klein, Andreas Husch, Christophe Pouzat, Jens C Brüning, Peter Kloppenburg
Satiety-signaling, pro-opiomelanocortin (POMC)-expressing neurons in the arcuate nucleus of the hypothalamus play a pivotal role in the regulation of energy homeostasis. Recent studies reported altered mitochondrial dynamics and decreased mitochondria- endoplasmic reticulum contacts in POMC neurons during diet-induced obesity. Since mitochondria play a crucial role in Ca(2+) signaling, we investigated whether obesity alters Ca(2+) handling of these neurons in mice. In diet-induced obesity, cellular Ca(2+) handling properties including mitochondrial Ca(2+) uptake capacity are impaired, and an increased resting level of free intracellular Ca(2+) is accompanied by a marked decrease in neuronal excitability...
August 1, 2017: ELife
https://www.readbyqxmd.com/read/28752053/dietary-sugars-not-lipids-drive-hypothalamic-inflammation
#6
Yuanqing Gao, Maximilian Bielohuby, Thomas Fleming, Gernot F Grabner, Ewout Foppen, Wagner Bernhard, Mara Guzmán-Ruiz, Clarita Layritz, Beata Legutko, Erwin Zinser, Cristina García-Cáceres, Ruud M Buijs, Stephen C Woods, Andries Kalsbeek, Randy J Seeley, Peter P Nawroth, Martin Bidlingmaier, Matthias H Tschöp, Chun-Xia Yi
OBJECTIVE: The hypothalamus of hypercaloric diet-induced obese animals is featured by a significant increase of microglial reactivity and its associated cytokine production. However, the role of dietary components, in particular fat and carbohydrate, with respect to the hypothalamic inflammatory response and the consequent impact on hypothalamic control of energy homeostasis is yet not clear. METHODS: We dissected the different effects of high-carbohydrate high-fat (HCHF) diets and low-carbohydrate high-fat (LCHF) diets on hypothalamic inflammatory responses in neurons and non-neuronal cells and tested the hypothesis that HCHF diets induce hypothalamic inflammation via advanced glycation end-products (AGEs) using mice lacking advanced glycation end-products (AGEs) receptor (RAGE) and/or the activated leukocyte cell-adhesion molecule (ALCAM)...
August 2017: Molecular Metabolism
https://www.readbyqxmd.com/read/28733832/seasonal-reorganization-of-hypothalamic-neurogenic-niche-in-adult-sheep
#7
Lucile Butruille, Martine Batailler, Danièle Mazur, Vincent Prévot, Martine Migaud
Neurogenesis is the process by which new neurons are generated. This process, well established during development, persists in adulthood owing to the presence of neural stem cells (NSCs) localized in specific brain areas called neurogenic niches. Adult neurogenesis has recently been shown to occur in the hypothalamus, a structure involved in the neuroendocrine regulation of reproduction and metabolism, among others. In the adult sheep-a long-lived mammalian model-we have previously reported the existence of such a neurogenic niche located in the hypothalamic arcuate nucleus and the median eminence...
July 21, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28727208/differential-expression-of-appetite-regulating-genes-in-avian-models-of-anorexia-and-obesity
#8
Jiaqing Yi, Jingwei Yuan, Elizabeth R Gilbert, Paul B Siegel, Mark A Cline
Chickens from lines that have been selected for low (LWS) or high (HWS) juvenile body weight for more than 57 generations provide a unique model to research appetite regulation. The LWS display different severities of anorexia while all HWS become obese. Herein we measured mRNA abundance of various factors in appetite-associated nuclei in the hypothalamus. The lateral hypothalamus (LHA), paraventricular nucleus (PVN), ventromedial hypothalamus (VMH), dorsomedial nucleus (DMN), and arcuate nucleus (ARC) were collected from 5 day-old chicks that were fasted for 180 minutes or provided continuous access to food...
July 20, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/28717967/orexin-a-hypocretin-modulates-leptin-receptor-mediated-signaling-by-allosteric-modulations-mediated-by-the-ghrelin-ghs-r1a-receptor-in-hypothalamic-neurons
#9
Mireia Medrano, David Aguinaga, Irene Reyes-Resina, Enric I Canela, Josefa Mallol, Gemma Navarro, Rafael Franco
The hypothalamus is a key integrator of nutrient-seeking signals in the form of hormones and metabolites originated in both the central nervous system and the periphery. The main autocrine and paracrine target of orexinergic-related hormones such as leptin, orexin/hypocretin, and ghrelin are neuropeptide Y neurons located in the arcuate nucleus of the hypothalamus. The aim of this study was to investigate the expression and the molecular and functional relationships between leptin, orexin/hypocretin and ghrelin receptors...
July 17, 2017: Molecular Neurobiology
https://www.readbyqxmd.com/read/28709906/effects-of-feeding-time-on-daily-rhythms-of-neuropeptide-and-clock-gene-expression-in-the-rat-hypothalamus
#10
Dawei Wang, Anne-Loes Opperhuizen, Jane Reznick, Nigel Turner, Yan Su, Gregory J Cooney, Andries Kalsbeek
Shiftworkers are exposed to several adverse health conditions, one being eating at night. Food consumption at an unnatural time-of-day is thought to be one of the main factors responsible for the increased risk of developing metabolic diseases, such as obesity and diabetes mellitus. The underlying mechanism is considered to include disruption of the circadian organization of physiology, leading to disruption of metabolism. When food is consumed at night, the hypothalamus, a brain region central to homeostasis, receives contradicting input from the central clock and the systemic circulation...
July 11, 2017: Brain Research
https://www.readbyqxmd.com/read/28699305/enhancement-of-the-lh-surge-by-male-olfactory-signals-is-associated-with-avpv-kiss1-cell-activation-in-female-rats
#11
Youki Watanabe, Kana Ikegami, Ren Ishigaki, Nahoko Ieda, Yoshihisa Uenoyama, Kei-Ichiro Maeda, Hiroko Tsukamura, Naoko Inoue
Olfactory stimuli play an important role in regulating reproductive functions in mammals. The present study investigated the effect of olfactory signals derived from male rats on kisspeptin neuronal activity and luteinizing hormone (LH) secretion in female rats. Wistar-Imamichi strain female rats were ovariectomised (OVX) and implanted with preovulatory levels of oestradiol-17β (E2). OVX+E2 rats were sacrificed 1 hour after exposure to either: clean bedding, female-soiled bedding or male-soiled bedding. Dual staining for Kiss1 mRNA in situ hybridization and c-Fos immunohistochemistry revealed that the numbers of Kiss1-expressing cells and c-Fos-immunopositive Kiss1-expressing cells in the anteroventral periventricular nucleus (AVPV) were significantly higher in OVX+E2 rats exposed to male-soiled bedding than those of the other groups...
July 12, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/28699230/short-term-high-fat-diet-increases-the-presence-of-astrocytes-in-the-hypothalamus-of-c57bl6-mice-without-altering-leptin-sensitivity
#12
Eglantine Balland, Michael A Cowley
Diet-induced obesity is associated with hypothalamic inflammation and this phenomenon has been proposed to explain leptin resistance. In this study we used a short-term high fat diet (HFD) paradigm for 10days and analysed the cellular and physiological responses to leptin administration in C57BL6 mice. In parallel we performed GFAP immuno-staining to measure the presence of astrocytes in the arcuate nucleus of the hypothalamus (ARH) after 10 days and 20 weeks of HFD. Interestingly our results demonstrate that the presence of star-like astrocytes is significantly increased after 10 days of HFD but this is not associated with the absence of cellular and physiological response to leptin administration in mice...
July 12, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/28694181/allopregnanolone-involvement-in-feeding-regulation-overeating-and-obesity
#13
E Holmberg, J Sjöstedt, E Malinina, M Johansson, S Turkmen, G Ragagnin, A Lundqvist, M Löfgren, L Jaukkuri, M Bixo, T Bäckström
Obesity is strongly associated with ill health, primarily caused by consumption of excessive calories, and promoted (inter alia) by gamma-amino-butyric-acid (GABA) stimulating food intake by activating GABAA receptors (primarily with α3 and α2 subunits) in the hypothalamic arcuate nucleus and paraventricular nucleus. Allopregnanolone is a potent positive GABAA receptor modulating steroid (GAMS). As reviewed here, elevated allopregnanolone levels are associated with increases in food intake, preferences for energy-rich food, and obesity in humans and other mammals...
July 8, 2017: Frontiers in Neuroendocrinology
https://www.readbyqxmd.com/read/28694154/short-photoperiod-reverses-obesity-in-siberian-hamsters-via-sympathetically-induced-lipolysis-and-browning-in-adipose-tissue
#14
REVIEW
Vitaly Ryu, Eleen Zarebidaki, H Elliott Albers, Bingzhong Xue, Timothy J Bartness
Changes in photoperiod length are transduced into neuroendocrine signals by melatonin (MEL) secreted by the pineal gland triggering seasonally adaptive responses in many animal species. Siberian hamsters, transferred from a long-day 'summer-like' photoperiod (LD) to a short-day 'winter-like' photoperiod (SD), exhibit a naturally-occurring reversal in obesity. Photoperiod-induced changes in adiposity are mediated by the duration of MEL secretion and can be mimicked by exogenously administered MEL into animals housed in LD...
July 7, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28687372/effects-of-a-free-choice-high-fat-high-sugar-diet-on-brain-per2-and-bmal1-protein-expression-in-mice
#15
Aurea Blancas-Velazquez, Susanne E la Fleur, Jorge Mendoza
The suprachiasmatic nucleus (SCN) times the daily rhythms of behavioral processes including feeding. Beyond the SCN, the hypothalamic arcuate nucleus (ARC), involved in feeding regulation and metabolism, and the epithalamic lateral habenula (LHb), implicated in reward processing, show circadian rhythmic activity. These brain oscillators are functionally coupled to coordinate the daily rhythm of food intake. In rats, a free choice high-fat high-sugar (fcHFHS) diet leads to a rapid increase of calorie intake and body weight gain...
October 1, 2017: Appetite
https://www.readbyqxmd.com/read/28684238/involvement-of-central-nesfatin-1-neurons-on-oxytocin-induced-feeding-suppression-in-rats
#16
Reiko Saito, Satomi Sonoda, Hiromichi Ueno, Yasuhito Motojima, Mitsuhiro Yoshimura, Takashi Maruyama, Hirofumi Hashimoto, Kentaro Tanaka, Yukiyo Yamamoto, Koichi Kusuhara, Yoichi Ueta
Peripheral anorectic hormones, such as peptide YY (PYY) and oxytocin (OXT), suppress food intake. A newly identified anorectic neuropeptide, nesfatin-1, is synthesized in both peripheral tissue and the central nervous system, particularly by various nuclei in the hypothalamus and brainstem. Here, we examined the effects of intraperitoneal (ip) administration of PYY3-36, OXT, and OXT analog, on nesfatin-1-immunoreactive (ir) neurons in the rat hypothalamus and brainstem, using Fos double fluorescence-immunohistochemistry...
August 10, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28675783/insulin-and-leptin-excite-anorexigenic-proopiomelanocortin-neurons-via-activation-of-trpc5-channels
#17
REVIEW
Jian Qiu, Edward J Wagner, Oline K Rønnekleiv, Martin J Kelly
Proopiomelanocortin (POMC) neurons within the hypothalamic arcuate nucleus are vital anorexigenic neurons. Both the insulin receptor and leptin receptor are coupled to activation of phosphatidylinositide-3 kinase (PI3K) to regulate multiple functions that increase POMC neuronal excitability. Using whole-cell recording in several mammalian species, we have found that both insulin and leptin depolarized POMC neurons via activation of TRPC5 channels. TRPC5 channels have been rigorously characterized as the downstream effector based on their biophysical properties, pharmacological profile and localization by immunocytochemistry and scRT-PCR...
July 4, 2017: Journal of Neuroendocrinology
https://www.readbyqxmd.com/read/28661071/scheduled-meal-accelerates-entrainment-to-a-6-h-phase-advance-by-shifting-central-and-peripheral-oscillations-in-rats
#18
L M Ubaldo-Reyes, R M Buijs, C Escobar, M Ángeles-Castellanos
Travelling across several time zones requires a fast adjustment of the circadian system and the differential adjustment speeds of organs and systems results in what is commonly referred as jet lag. During this transitory state of circadian disruption, individuals feel discomfort, appetite loss, fatigue, disturbed sleep and deficient performance of multiple tasks. We have demonstrated that after a 6-h phase advance of the light-dark cycle (LD) scheduled food in phase with the new night onset can speed up re-entrainment...
August 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28654917/hypertriglyceridemia-in-female-rats-during-pregnancy-induces-obesity-in-male-offspring-via-altering-hypothalamic-leptin-signaling
#19
Tanzil Ur Rahman, Kamran Ullah, Zhang-Hong Ke, Meng-Xi Guo, Lu-Yang Jin, Jun Ren, Yu-Zhong Zhou, Yi Cheng, Xin-Yan Dong, Hai-Yan Pang, Ting-Ting Wang, Jian-Zhong Sheng, He-Feng Huang
Maternal obesity influence the child's long-term development and health. Though, the mechanism concerned in this process is still uncertain. In the present study, we explored whether overfeeding of a high-fat diet during pregnancy in female rats altered metabolic phenotypes in an F1 generation and authenticated the contribution of hypothalamic leptin signaling. Leptin responsiveness and the number of immunopositive neurons for phosphorylated signal transducer and activator transcription 3 (pSTAT3) were analyzed...
June 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28653356/arcuate-nucleus-homeostatic-systems-reflect-blood-leptin-concentration-but-not-feeding-behaviour-during-scheduled-feeding-on-a-high-fat-diet-in-mice
#20
T Bake, J Baron, J S Duncan, D G A Morgan, J G Mercer
Hypothalamic homeostatic and forebrain reward-related genes were examined in the context of scheduled meal feeding without caloric restriction in C57BL/6 mice. Mice fed ad libitum but allowed access to a palatable high fat diet for 2 h a day rapidly adapted their feeding behaviour and consumed approximately 80% of their daily caloric intake during this 2 h scheduled feed. Gene expression levels were examined during either the first or second hour of scheduled feeding vs. 24 h ad libitum feeding on the same high fat diet...
June 27, 2017: Journal of Neuroendocrinology
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