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https://www.readbyqxmd.com/read/29054431/lesions-of-the-lateral-habenula-improve-working-memory-performance-in-hemiparkinsonian-rats
#1
Cheng Xue Du, Jian Liu, Yuan Guo, Li Zhang, Qiao Jun Zhang
The lateral habenula (LHb) is an important structure involved in various brain functions, because it controls the activity of dopaminergic and serotonergic systems in the midbrain. The impairment of working memory commonly occurs in Parkinson's disease; however, it is not clear whether the LHb involves in the regulation of working memory in rats with unilateral 6-hydroxydopamine lesions of the medial forebrain bundle (MFB). In this study, we found that the MFB lesions in rats decreased choice accuracy as measured by the T-maze rewarded alternation test compared to control rats, indicating the induction of working memory impairment, and decreased dopamine (DA) levels in the medial prefrontal cortex (mPFC), hippocampus and amygdala...
October 17, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28986462/the-lateral-habenula-and-its-input-to-the-rostromedial-tegmental-nucleus-mediates-outcome-specific-conditioned-inhibition
#2
Vincent Laurent, Felix L Wong, Bernard W Balleine
Animals can readily learn that stimuli predict the absence of specific appetitive outcomes; however, the neural substrates underlying such outcome-specific conditioned inhibition remain largely unexplored. Here, we examined the involvement of the lateral habenula (LHb) and of its inputs onto the rostromedial tegmental nucleus (RMTg) in inhibitory learning using female and male rats as subjects. In these experiments, we used backward conditioning and contingency reversal to establish outcome-specific conditioned inhibitors for two distinct appetitive outcomes, and then assessed the effects of manipulations of the LHb and the LHb-RMTg pathway on that inhibitory encoding using the Pavlovian-instrumental transfer paradigm...
October 6, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28983764/effect-of-patient-age-on-accuracy-of-primary-mri-signs-of-long-head-of-biceps-tearing-and-instability-in-the-shoulder-an-mri-arthroscopy-correlation-study
#3
Camilo G Borrero, Joanna Costello, Marnie Bertolet, Dharmesh Vyas
OBJECTIVE: To determine the effect of patient age on the accuracy of primary MRI signs of long head of biceps (LHB) tendon tearing and instability in the shoulder using arthroscopy as a reference standard. MATERIALS AND METHODS: Subjects with MRI studies and subsequent arthroscopy documenting LHB tendon pathology were identified and organized into three age groups (18-40, 41-60, 61-87). Normal and tendinopathic tendons were labeled grade 0, partial tears grade 1 and full tears grade 2...
October 6, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28974703/sex-steroid-production-associated-with-puberty-is-absent-in-germ-cell-free-salmon
#4
Lene Kleppe, Eva Andersson, Kai Ove Skaftnesmo, Rolf B Edvardsen, Per Gunnar Fjelldal, Birgitta Norberg, Jan Bogerd, Rüdiger W Schulz, Anna Wargelius
In all vertebrates studied so far, germ cells are not required for pubertal maturation of the gonadal steroidogenic system, subsequent development of secondary sex characteristics and reproductive behavior. To explore if the absence of germ cells affects puberty or growth in Atlantic salmon, germ cell-free (GCF), dnd knockout and wild type (WT) postsmolts were stimulated to enter puberty. No GCF fish entered puberty, whereas 66.7% (males) and 30% (females) WT fish completed or entered puberty, respectively...
October 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28972919/reproductive-effects-of-synthetic-progestin-norgestrel-in-zebrafish-danio-rerio
#5
Yan-Qiu Liang, Guo-Yong Huang, Zhong Lin, Jin Li, Jie-Wen Yang, Lai-Yuan Zhong, Guang-Guo Ying
The aim of this study was to assess the adverse effects of synthetic progestin norgestrel (NGT) on the reproduction of zebrafish by measuring the egg production, histology and transcriptional expression profiles along the hypothalamic-pituitary-gonadal (HPG) axis in adult zebrafish. After a pre-exposure period of 7 days, adult zebrafish were exposed to 6, 29 and 69 ng L(-1) NGT for 21 days. The results showed that exposure to 69 ng L(-1) NGT led to a significant up-regulation of follicle stimulating hormone, beta polypeptide (fshb), luteinizing hormone, beta polypeptide (lhb), progesterone receptor (pgr), estrogen receptor 1 (esr1) and androgen receptor (ar) genes in the brains, as well as significant up-regulation of hydroxysteroid 20-beta dehydrogenase (hsd20b) and hydroxysteroid 11-beta dehydrogenase 2 (hsd11b2) genes and down-regulation of 11-beta-hydroxylase (cyp11b) gene in the ovaries of females...
September 27, 2017: Chemosphere
https://www.readbyqxmd.com/read/28970991/long-biceps-subpectoral-tenodesis-with-suspensory-button-and-bicortical-fixation
#6
Nuno Gomes, Manuel Ribeiro da Silva, Helder Pereira, Ricardo Aido, Ricardo Sampaio
Tenodesis of the long head of the biceps (LHB) tendon has long been recognized as a valid alternative to address pathologic conditions of this tendon. However, the location and type of fixation is still a matter of discussion, because common complications associated with this procedure include failure of the repair, persistent pain, reaction to the fixation device, cosmetic deformity, and fracture. The authors describe a method of subpectoral LHB tenodesis that aims to preserve bone stock and allows a strong, easy, and reproducible type of fixation with a minimal approach...
August 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/28964731/time-and-dose-related-effects-of-a-gonadotropin-releasing-hormone-agonist-and-dopamine-antagonist-on-reproduction-in-the-northern-leopard-frog-lithobates-pipiens
#7
Maria Vu, Bradley Weiler, Vance L Trudeau
Gonadotropin-releasing hormone (GnRH) stimulates luteinizing hormone release to control ovulation and spermiation in vertebrates. Dopamine (DA) has a clear inhibitory role in the control of reproduction in numerous teleosts, and emerging evidence suggests that similar mechanisms may exist in amphibians. The interactions between GnRH and DA on spawning success and pituitary gene expression in the Northern leopard frog (Lithobates pipiens) were therefore investigated. Frogs were injected during the natural breeding season with a GnRH agonist [GnRH-A; (Des-Gly(10), D-Ala(6), Pro-NHEt(9))-LHRH; 0...
December 1, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28873572/implications-of-hydration-depletion-in-the-in-vitro-starch-digestibility-of-white-bread-crumb-and-crust
#8
Mario M Martínez, Laura Román, Manuel Gómez
The objective of this study was to provide understanding about the efficacy of decreasing dough hydration to slow down starch digestibility in white bread. Breads were made with 45 (low hydration bread, LHB), 60 (intermediate hydration bread, IHB) and 75% (high hydration bread, HHB) water (flour basis). A hydration depletion down to 45%, which is close to the minimum hydration found in commercially available white bread, did not prevent the starch in the crumb from complete gelatinization. However, LHB and IHB crumbs were more resistant to physical breakdown during in vitro digestion than HHB crumbs, resulting in a 96...
January 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/28871962/aversive-stimuli-drive-hypothalamus-to-habenula-excitation-to-promote-escape-behavior
#9
Salvatore Lecca, Frank Julius Meye, Massimo Trusel, Anna Tchenio, Julia Harris, Martin Karl Schwarz, Denis Burdakov, Francois Georges, Manuel Mameli
A sudden aversive event produces escape behaviors, an innate response essential for survival in virtually all-animal species. Nuclei including the lateral habenula (LHb), the lateral hypothalamus (LH), and the midbrain are not only reciprocally connected, but also respond to negative events contributing to goal-directed behaviors. However, whether aversion encoding requires these neural circuits to ultimately prompt escape behaviors remains unclear. We observe that aversive stimuli, including foot-shocks, excite LHb neurons and promote escape behaviors in mice...
September 5, 2017: ELife
https://www.readbyqxmd.com/read/28865912/inhibition-of-ampa-receptor-and-camkii-activity-in-the-lateral-habenula-reduces-depressive-like-behavior-and-alcohol-intake-in-rats
#10
Jing Li, Seungwoo Kang, Rao Fu, Liangzhi Wu, Wei Wu, Hongwei Liu, Danielle Gregor, Wanhong Zuo, Alex Bekker, Jiang-Hong Ye
Depression is a well-known risk factor for developing relapse drinking, but the neuronal mechanisms underlying the interactions between depression and alcohol use disorders remain elusive. Accumulating evidence has associated depression with hyperactivity of the lateral habenula (LHb), an epithalamic structure in the brain that encodes aversive signals. Glutamate receptors contribute substantially to the excitability of LHb neurons. Glutamatergic synapses in LHb neurons largely express GluA1-containing α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors (AMPAR) that can be modulated by Ca(2+)/calmodulin-dependent protein II (CaMKII)...
November 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28863434/interaction-between-kisspeptin-and-adenylate-cyclase-activating-polypeptide-1-on-the-expression-of-pituitary-gonadotropin-subunits-a-study-using-mouse-pituitary-lbetat2-cells
#11
Tselmeg Mijiddorj, Haruhiko Kanasaki, Aki Oride, Tomomi Hara, Unurjargal Sukhbaatar, Tuvshintugs Tumurbaatar, Satoru Kyo
We examined direct effect of kisspeptin on pituitary gonadotrophs. Kisspeptin-10 (KP10) significantly increased the promoter activities of the gonadotropin subunits, common alpha-glycoprotein (Cga), luteinizing hormone beta (Lhb), and follicle-stimulatinghormone beta (Fshb) in LbetaT2 cells overexpressing kisspeptin receptor (Kiss1r). KP10 and gonadotropin-releasing hormone (GnRH) increased gonadotropin subunit levels to similar degrees and combined treatment with GnRH and KP10 did not potentiate their individual effects...
May 1, 2017: Biology of Reproduction
https://www.readbyqxmd.com/read/28856351/biceps-tenodesis-an-evolution-of-treatment
#12
Brandon J Erickson, Akshay Jain, Gregory L Cvetanovich, Gregory P Nicholson, Brian J Cole, Anthony A Romeo, Nikhil N Verma
The long head of the biceps (LHB) tendon is a potential generator of pain within the shoulder. Tenodesis of the LHB is a treatment option for several pathologic shoulder conditions. We conducted a study to determine trends in LHB tenodesis at a subspecialty-focused shoulder orthopedic practice. We hypothesized that the rate of LHB tenodesis would increase significantly over time and that there would be no significant change in the age of patients who underwent LHB tenodesis. Records of 4 fellowship-trained sports or shoulder/elbow orthopedic surgeons were used to identify total number of common arthroscopic shoulder surgeries performed between 2004 and 2014...
July 2017: American Journal of Orthopedics
https://www.readbyqxmd.com/read/28855337/an-epigenetic-switch-repressing-tet1-in-gonadotropes-activates-the-reproductive-axis
#13
Yahav Yosefzon, Cfir David, Anna Tsukerman, Lilach Pnueli, Sen Qiao, Ulrich Boehm, Philippa Melamed
The TET enzymes catalyze conversion of 5-methyl cytosine (5mC) to 5-hydroxymethyl cytosine (5hmC) and play important roles during development. TET1 has been particularly well-studied in pluripotent stem cells, but Tet1-KO mice are viable, and the most marked defect is abnormal ovarian follicle development, resulting in impaired fertility. We hypothesized that TET1 might play a role in the central control of reproduction by regulating expression of the gonadotropin hormones, which are responsible for follicle development and maturation and ovarian function...
September 19, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28844005/synaptic-potentiation-mediated-by-l-type-voltage-dependent-calcium-channels-mediates-the-antidepressive-effects-of-lateral-habenula-stimulation
#14
Qinji Zhou, Jianyang Dong, Ting Xu, Xiang Cai
Although deep-brain stimulation (DBS) of the lateral habenula (LHb) has been successfully applied to treatment-resistant depression for years, the mechanism is still unclear. Previous researches have demonstrated that LHb-DBS elevates brain monoamine neurotransmitters. However, these changes do not account for the treatment efficacy on treatment-resistant depression, or the rapid behavioral effects in rats; the evidence suggests that altered synaptic potentiation may contribute to the treatment effects. We applied LHb-DBS in a rat model of learned helplessness (LH) and analyzed mammalian target of rapamycin (mTOR) phosphorylation...
August 24, 2017: Neuroscience
https://www.readbyqxmd.com/read/28843542/effects-of-gaba-microinjection-into-dorsal-raphe-nucleus-on-behavior-and-activity-of-lateral-habenular-neurons-in-mice
#15
Jinyu Xiao, Meiying Song, Fengdan Li, Xiaofeng Liu, Alinur Anwar, Hua Zhao
The dorsal raphe nucleus (DRN) is a key site for 5-hydroxytryptamine (5-HT) synthesis and release. DRN dysfunction has been implicated in several stress-related disorders, including depression and anxiety. The lateral habenular nucleus (LHb) has been shown to inhibit the activity of DRN 5-HT neurons, and thus the LHb-DRN pathway plays an important role in the pathogenesis of depression. Although it is known that the LHb also receives the projection from the 5-HT neuron in the DRN, whether 5-HT neurons in the DRN can influence activity of the LHb in vivo and whether this effect is related to the induced behavioral changes have not been investigated...
August 24, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28842745/diagnosis-of-long-head-of-biceps-tendinopathy-in-rotator-cuff-tear-patients-correlation-of-imaging-and-arthroscopy-data
#16
Morgane Rol, Luc Favard, Julien Berhouet
INTRODUCTION: The goal of this prospective study was to assess the reliability of pre-operative cross-sectional imaging for the diagnosis of long head of biceps (LHB) tendinopathy in patients with a rotator cuff tear. METHODS: Cross-sectional imaging with MRI or CT arthrography data from 25 patients operated upon because of a rotator cuff tear between 1 October 2015 and 1 April 2016 was analysed by one experienced orthopaedic surgeon, one experienced radiologist and one orthopaedic resident...
August 25, 2017: International Orthopaedics
https://www.readbyqxmd.com/read/28822774/effects-of-neuropeptides-and-sex-steroids-on-the-pituitary-gonadal-axis-of-pre-pubertal-f1-wreckfish-h%C3%A4-puku-polyprion-oxygeneios-in-vivo-evidence-of-inhibitory-effects-of-androgens
#17
Matthew J Wylie, Alvin N Setiawan, Glen W Irvine, Jane E Symonds, Abigail Elizur, P Mark Lokman
The ability to advance puberty in broodstock that have a long generation interval and mature at large size is a highly valuable tool in contemporary aquaculture enterprise. Juvenile male and female wreckfish 'hāpuku' (Polyprion oxygeneios), a candidate for commercialization in aquaculture, were subjected to treatment for 8weeks with two implants, one containing steroid (blank; estradiol-17β, E2; 11-ketotestosterone, KT; 17 α-methyltestosterone, MT), the other peptide (blank; gonadotropin-releasing hormone analog, GnRHa; kisspeptin, Kiss2-12)...
August 16, 2017: General and Comparative Endocrinology
https://www.readbyqxmd.com/read/28822640/comparison-of-outcomes-1%C3%A2-year-after-rotator-cuff-repair-with-and-without-concomitant-biceps-surgery
#18
Scott T Watson, Christopher B Robbins, Asheesh Bedi, James E Carpenter, Joel J Gagnier, Bruce S Miller
PURPOSE: To compare the outcomes of patients who undergo a long head of the biceps (LHB) procedure (tenotomy or tenodesis) concomitant with rotator cuff repair (RCR) to those of patients who undergo isolated RCR. METHODS: Prospectively collected data were retrospectively reviewed on 80 patients, >18 years old, who underwent repair of a full-thickness rotator cuff tear and with 1-year patient-reported outcome scores collected June 2012 to March 2015. The exclusion criteria were concomitant procedures other than LHB tenotomy, tenodesis, or subacromial decompression; prior shoulder surgery; or other shoulder pathology...
August 16, 2017: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/28821029/effect-of-gum-arabic-modified-alginate-on-physicochemical-properties-release-kinetics-and-storage-stability-of-liquid-core-hydrogel-beads
#19
Fu-Hsuan Tsai, Yutaka Kitamura, Mito Kokawa
Different weight ratios of alginate/gum arabic (GA) solutions were prepared to serve as the wall material of liquid-core hydrogel beads (LHB) that were formulated to protect the total phenolic compounds (TP) of radish by-product juice from degradation during storage and release in simulated gastrointestinal fluid. The diameter of LHB ranged from 4.63 to 5.66mm with a sphericity lower than 0.05. LHB formulated with 25% GA (AGB0.25) exhibited the highest hardness (26.63N), and those formulated with 50% GA (AGB0...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28819610/a-rare-case-of-massive-rotator-cuff-tear-and-biceps-tendon-rupture-with-posterior-shoulder-dislocation-in-a-young-adult-surgical-decision-making-and-outcome
#20
En Loong Soon, Hamid Rahmatullah Bin Abd Razak, Andrew Hwee Chye Tan
INTRODUCTION: Massive rotator cuff tears (RCTs) in the context of shoulder dislocations are relatively uncommon in the young adult (<40 years) and if reported are more commonly described in association with acute traumatic anterior glenohumeral dislocations. They have rarely been described with posterior dislocations, regardless of patient age. This is the 1(st) case reported in the context of posterior dislocations, where a triad of biceps tendon rupture, posterior dislocation, and RCTs was observed during surgery...
March 2017: Journal of Orthopaedic Case Reports
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