keyword
MENU ▼
Read by QxMD icon Read
search

LH

keyword
https://www.readbyqxmd.com/read/29351247/b-type-and-complex-a-b-type-epicatechin-trimers-isolated-from-litchi-pericarp-aqueous-extract-show-high-antioxidant-and-anticancer-activity
#1
Yihui Gong, Fang Fang, Xin Zhang, Bin Liu, Honghui Luo, Zhen Li, Xuelian Zhang, Zhaoqi Zhang, Xuequn Pang
Litchi (Litchi chinensis Sonn.) fruit is known for its rich source of phenolics. Litchi pericarp contains high levels of epicatechin that may form oligomers of various lengths. Except for several A or B type epicatechin dimers, other soluble oligomers have rarely been identified in the pericarp. Here, bioassay-guided column fractionation was applied to isolate bioactive phenolics from aqueous pericarp extract. A fraction (S3) was obtained by two rounds of Sephadex LH-20 column chromatography, and showed higher antioxidant activity and inhibition on the proliferation of human lung cancer cells (A549) than Litchi anthocyanins...
January 19, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29349677/mercuric-chloride-induced-ovarian-oxidative-stress-by-suppressing-nrf2-keap1-signal-pathway-and-its-downstream-genes-in-laying-hens
#2
Yan Ma, Mingkun Zhu, Liping Miao, Xiaoyun Zhang, Xinyang Dong, Xiaoting Zou
The present study evaluated the effects of mercury chloride (HgCl2) on follicular atresia rate, sex hormone secretion, and ovarian oxidative stress in laying hens. Antioxidant enzyme genes and the nuclear factor erythroid 2-related factor 2 (Nrf2)-Kelch-like ECH-associated protein 1 (Keap1) signal pathway were further studied to uncover the molecular mechanism. A total of 768 40-week-old Hy-Line Brown laying hens were randomly allocated to four treatments with eight pens per treatment and 24 hens of each pen...
January 18, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29342933/in-vitro-anticoagulant-activity-and-active-components-of-safflower-injection
#3
Kai-Hong Wang, Shi-Fei Li, Yi Zhao, Hong-Xia Li, Li-Wei Zhang
Safflower injection is well-known as a traditional Chinese medicine used to improve the blood circulation. In this study, seven safflower injection samples from different companies were evaluated for their in vitro anticoagulant activity by measuring their activated partial thromboplastin time (APTT) and prothrombin time (PT) against human plasma. The screening results suggested that the safflower injections exhibited a significant prolonging influence on APTT (p < 0.05 vs. the control group), but not on prolonging PT (p > 0...
January 15, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29341896/luteinizing-hormone-signaling-phosphorylates-and-activates-the-cyclic-gmp-phosphodiesterase-pde5-in-mouse-ovarian-follicles-contributing-an-additional-component-to-the-hormonally-induced-decrease-in-cyclic-gmp-that-reinitiates-meiosis
#4
Jeremy R Egbert, Siu-Pok Yee, Laurinda A Jaffe
Prior to birth, oocytes within mammalian ovarian follicles initiate meiosis, but then arrest in prophase until puberty, when with each reproductive cycle, one or more follicles are stimulated by luteinizing hormone (LH) to resume meiosis in preparation for fertilization. Within preovulatory follicles, granulosa cells produce high levels of cGMP, which diffuses into the oocyte to maintain meiotic arrest. LH signaling restarts meiosis by rapidly lowering the levels of cGMP in the follicle and oocyte. Part of this decrease is mediated by the dephosphorylation and inactivation the NPR2 guanylyl cyclase in response to LH, but the mechanism for the remainder of the cGMP decrease is unknown...
January 13, 2018: Developmental Biology
https://www.readbyqxmd.com/read/29339197/differential-insulin-and-steroidogenic-signaling-in-insulin-resistant-and-non-insulin-resistant-human-luteinized-granulosa-cells-a-study-in-pcos-patients
#5
Muskaan Belani, Abhilash Deo, Preeti Shah, Manish Banker, Pawan Singal, Sarita Gupta
Insulin resistance (IR) is one of the significant aberrations in polycystic ovarian syndrome (PCOS), however is only observed in 70%-80% of obese PCOS and 20%-25% of lean PCOS. Hyperinsulinemia accompanies PCOS-IR along with hyperandrogenemia against normal insulin and androgen levels in PCOS-non insulin resistance (NIR). This could possibly be due to defects in the downstream signaling pathways. The study thus aims to unravel insulin and steroidogenic signaling pathways in luteinized granulosa cells isolated from PCOS -IR and NIR vs matched controls...
January 12, 2018: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29335207/synthesis-and-biological-evaluation-of-3-2-aminoethyl-uracil-derivatives-as-gonadotropin-releasing-hormone-gnrh-receptor-antagonists
#6
Seon-Mi Kim, Minhee Lee, So Young Lee, Soo-Min Lee, Eun Jeong Kim, Jae Sun Kim, Jihyae Ann, Jiyoun Lee, Jeewoo Lee
We investigated a series of uracil analogues by introducing various substituents on the phenyl ring of the N-3 aminoethyl side chain and evaluated their antagonistic activity against human gonadotropin-releasing hormone (GnRH) receptors. Analogues with substituents at the ortho or meta position demonstrated potent in vitro antagonistic activity. Specifically, the introduction of a 2-OMe group enhanced nuclear factor of activated T-cells (NFAT) inhibition up to 6-fold compared to the unsubstituted analogue...
January 2, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29334454/aurophilic-interactions-in-l-au-x-%C3%A2-l-au-x-dimers-calibration-by-experiment-and-theory
#7
Erik Andris, Prokopis Andrikopoulos, Jiří Schulz, Jan Turek, Aleš Růžička, Jana Roithová, Lubomír Rulíšek
Attractive metallophilic (aurophilic, argentophilic, cuprophilic, …) interactions play an important role in arrangement and stabilization of oligonuclear metal ion complexes. We report a combined experimental and theoretical assessment of aurophilic interactions in closed-shell gold(I) dimers. The experimental binding energies were obtained for charged [(LH)AuCl]+…[(L')AuCl] dimers (L is either a phosphine or a N-heterocyclic carbene ligand) in the gas phase. These energies served for benchmarking of correlated quantum chemical calculations (CCSD(T)-calibrated SCS-MP2/CBS method) that were then applied to neutral [(L)AuX]…[(L')AuX] dimers (X = Cl, Br, I)...
January 15, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29334419/a-metallo-pro-drug-to-target-cu-ii-in-the-context-of-alzheimer-s-disease
#8
Amandine Conte-Daban, Vinita Ambike, Régis Guillot, Nicolas Delsuc, Clotilde Policar, Christelle Hureau
Alzheimer's disease and oxidative stress are connected. In the present communication, we report the use of a Mn(II)-based superoxide dismutase mimic ([MnII(L)]+, 1+) as a pro-drug candidate to target Cu(II) associated events, i.e. Cu(II)-induced formation of reactive oxygen species (ROS) and modulation of the amyloid-beta (Abeta) peptide aggregation. Complex 1+ is able to remove Cu(II) from Abeta, stop ROS and prevent alteration of Abeta aggregation as would do the corresponding free ligand LH. Using 1+ instead of LH in further biological applications would have the double advantage to avoid the cell toxicity of LH and to benefit from its proved SOD-like activity...
January 15, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29334389/effect-of-coordination-geometry-on-the-magnetic-properties-of-a-series-of-ln2-and-ln4-hydroxo-clusters
#9
Amaleswari Rasamsetty, Chinmoy Das, E Carolina Sañudo, Maheswaran Shanmugam, Viswanathan Baskar
A series of three isostructural tetranuclear complexes with the general molecular formula [Ln4(μ3-OH)4(L)4(μ2-piv)4(MeOH)4] (Ln = Gd 1, Dy 2 and Ho 3; LH = [1,3-bis(o-methoxyphenyl)-propane-1,3-dione]) were isolated and unambiguously characterized by single crystal XRD. Under similar reaction conditions, simply changing the co-ligand from pivalate to 2,6-bis(hydroxymethyl)-p-cresol (LH'3) led to the isolation of dinuclear Ln(iii) complexes with the general molecular formula [Ln2(L)4(μ2-LH'2)2]·4DMF (Ln = Gd 4, Dy 5 and Ho 6)...
January 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29334211/curcumin-and-quercetin-ameliorated-cypermethrin-and-deltamethrin-induced-reproductive-system-impairment-in-male-wistar-rats-by-upregulating-the-activity-of-pituitary-gonadal-hormones-and-steroidogenic-enzymes
#10
Poonam Sharma, Irshad Aslam Khan, Rambir Singh
Background: Dietary antioxidants protect tissues and organs against insecticides/xenobiotic-induced damage. In the present study, we evaluated the results of exposure to synthetic pyrethroid insecticides, cypermethrin (Cyp) and deltamethrin (Del) and possible protective effects of curcumin and quercetin on reproductive system in male Wistar rats. MATERIALS AND METHODS: In this controlled experimental study, 42 male Wistar rats were randomly divided into 7 groups of 6 animals...
April 2018: International Journal of Fertility & Sterility
https://www.readbyqxmd.com/read/29334208/effects-of-crocin-on-the-pituitary-gonadal-axis-and-hypothalamic-kiss-1-gene-expression-in-female-wistar-rats
#11
Dina Zohrabi, Kazem Parivar, Mohammad Hossein Sanati, Nasim Hayati Roodbari
Background: Saffron (Crocus sativus L.) has been traditionally used as a spice for coloring and flavoring in some countries cuisine. One of the main components of saffron is Crocin. Recent research have shown that crocin has various pharmacological effects. The aim of this study was to assess the effects of crocin on the Pituitary-Gonadal axis and Kiss-1 gene expression in hypothalamus and ovarian tissue organization in female Wistar rats. MATERIALS AND METHODS: In this experimental study, 18 adult female Wistar rats were randomly divided into three groups...
April 2018: International Journal of Fertility & Sterility
https://www.readbyqxmd.com/read/29334206/decreased-expression-of-arginine-phenylalanine-amide-related-peptide-3-gene-in-dorsomedial-hypothalamic-nucleus-of-constant-light-exposure-model-of-polycystic-ovarian-syndrome
#12
Zahra Shaaban, Mohammad Reza Jafarzadeh Shirazi, Mohammad Hossein Nooranizadeh, Amin Tamadon, Farhad Rahmanifar, Somayeh Ahmadloo, Amin Ramezani, Mohammad Javad Zamiri, Iman Razeghian Jahromi, Fatemeh Sabet Sarvestani, Omid Koohi Hosseinabadi
Background: An abnormality in pulse amplitude and frequency of gonadotropin releasing hormone (GnRH) secretion is the most characteristics of polycystic ovarian syndrome (PCOS). On the other hand, arginine-phenylalanine-amide (RFamide)-related peptide-3 (RFRP3) inhibits the secretion of GnRH in mammalian hypothalamus. The current study performed in order to investigate the expression of RFRP3 mRNA in the dorsomedial hypothalamic nucleus (DMH) after the induction of PCOS in a rat model of constant light exposure, and the possible role of parity on occurrence of PCOS...
April 2018: International Journal of Fertility & Sterility
https://www.readbyqxmd.com/read/29334205/overexpression-of-endometrial-estrogen-receptor-alpha-in-the-window-of-implantation-in-women-with-unexplained-infertility
#13
Mehran Dorostghoal, Hamid-O-Allah Ghaffari, Farideh Marmazi, Narjes Keikhah
Background: Failure in the endometrial receptivity may account for a significant number of infertility cases including unexplained infertility in women. Reduction in the endometrial estrogen receptor-alpha (ER-α) expression during implantation may be a critical event that coincides with the expression of specific genes and the formation of a receptive endometrium. The aim of the present study was to assess the expression of ER-α in the mid-secretory phase in the endometrium of women with unexplained infertility...
April 2018: International Journal of Fertility & Sterility
https://www.readbyqxmd.com/read/29330919/meta-analysis-of-laparoscopic-versus-open-liver-resection-for-hepatocellular-carcinoma
#14
Bin Jiang, Xiufang Yan, Jian-Huai Zhang
OBJECTIVE: To evaluate surgical safety and effectiveness of laparoscopic hepatectomy(LH) in short- and long-term outcomes compared to open hepatectomy(OH) in patients operated for hepatocellular carcinoma (HCC). METHODS: An electronic search until August 2017 was conducted to identify comparative studies evaluating laparoscopic versus open liver resection for HCC. RESULTS: A total of 5889 patients (2421 underwent LH, and 3468 with OH) were included in our meta-analysis from 47 studies...
January 13, 2018: Hepatology Research: the Official Journal of the Japan Society of Hepatology
https://www.readbyqxmd.com/read/29329908/anatomical-evidence-for-lateral-hypothalamic-innervation-of-the-pontine-a7-catecholamine-cell-group-in-rat
#15
Janean E Holden, Monica A Wagner, Brady L Reeves
Substantial behavioral evidence exists to support the idea that the lateral hypothalamus (LH) makes axonal connection with spinally-projecting noradrenergic neurons of the A7 catecholamine cell group in the pons. Through this putative projection, the LH modulates nociception via α1- and α2-adrenoceptors in the dorsal horn. We used double-label immunocytochemistry to demonstrate that axons from the LH labeled with the anterograde tracer biotinylated dextran amine (BDA) appose tyrosine hydroxylase-immunoreactive (TH-ir) neuron profiles in the A7 area...
January 9, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29328024/endometrial-polyps-in-women-of-reproductive-age-clinical-and-pathogene-tic-variations
#16
N Kosei, N Zakharenko, D Herman
The aim of the study was to study the relationship between the morphofunctional characteristics of the endometrium, hormonal homeostasis and microbiocenosis of the reproductive system in patients with endometrial polyps. The study involved 130 patients aged 18-35 years: 34 patients with endometrial polyps, 30 patients with micropolyps, 36 patients with endometrial polyps and micropolyps, 30 healthy women of the control group. Hysteroscopy was performed for women who had been suspected for endometrial polyps and who had infertility or repeated recurrent miscarriages...
December 2017: Georgian Medical News
https://www.readbyqxmd.com/read/29326134/evaluation-of-estrogenic-potential-by-herbal-formula-hpc-03-for-in-vitro-and-in-vivo
#17
Bo Yoon Chang, Dae Sung Kim, Hye Soo Kim, Sung Yeon Kim
HPC 03 is herbal formula that consists of extracts from Angelica gigas, Cnidium officinale Makino and Cinnamomum cassia Presl. The present study evaluated the estrogenic potential of HPC 03 by using in vitro and in vivo models. The regulatory mechanisms of HPC 03 in estrogen-dependent MCF-7 cells were assessed. HPC 03 induced the proliferation of estrogen receptor-positive MCF-7 cells, and the proliferation was blocked by the addition of the estrogen antagonist tamoxifen. The estrogen receptorα/β luciferase activities were significantly increased by HPC 03 treatment, which also increased the mRNA expression of the estrogen-responsive genes Psen2, Pgr and Ctsd Also, we evaluated the ameliorative effects of HPC 03 on menopausal symptoms in ovariectomized rats...
February 2018: Reproduction: the Official Journal of the Society for the Study of Fertility
https://www.readbyqxmd.com/read/29326060/ovulation-is-associated-with-the-lh-dependent-induction-of-pla2g4aa-in-zebrafish
#18
Haipei Tang, Le Wang, Yu Chen, Jianan He, Ling Qu, Yin Guo, Yun Liu, Xiaochun Liu, Haoran Lin
The effects of the preovulatory luteinizing hormone (LH) surge on the ovulatory process are mediated by prostaglandins (PGs), the synthesis of which involves prostaglandin synthetase and cytosolic phospholipase A2 (cPLA2). In our previous study, we systematically investigated the function of prostaglandin endoperoxide synthase (ptgs) genes on ovulation in zebrafish. However, the role of cPLA2 in ovulation was not determined in zebrafish. In this study, we investigated the function of cpla2α in PGs production and ovulation in periovulatory follicles...
January 8, 2018: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/29324295/analytical-determination-of-the-reducing-and-stabilization-agents-present-in-different-zostera-noltii-extracts-used-for-the-biosynthesis-of-gold-nanoparticles
#19
Rafael Zarzuela, Manuel Jesús Luna, María Luisa Almoraima Gil, María Jesús Ortega, José María Palacios-Santander, Ignacio Naranjo-Rodríguez, Juan José Delgado, Laura María Cubillana-Aguilera
The objective of this work was to ascertain the nature of the components responsible for the reducing and stabilizing properties of Zostera noltii extracts that lead to gold nanoparticle formation using chemical techniques of analysis. In order to achieve this aim, we try the synthesis of AuNPs with three different extracts from plants collected in the Bay of Cádiz (Spain). The n-butanol extract produced the best results. Taking this into account, four fractions were isolated by Sephadex LH-20 column chromatography from this extract and we studied their activity...
December 28, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29323457/impact-of-subchronic-exposure-to-triclosan-and-or-fluoride-on-estrogenic-activity-in-immature-female-rats-the-expression-pattern-of-calbindin-d9k-and-estrogen-receptor-%C3%AE-genes
#20
Yasmina M Abd-Elhakim, Amany T Mohammed, Haytham A Ali
This study explored the influence of triclosan (TCS) in the absence and presence of sodium fluoride (NaF) on estrogenic activity and thyroid function of adolescent female rats. The results indicated that the individual exposure to TCS evoked a significant decline in T3 and T4 but the levels of estradiol, FSH, and LH were significantly elevated beside marked up regulation of calbindin-D9k and estrogen α mRNA expression. On the other hand, the single exposure to NaF causes insignificant changes in thyroid hormones, but evoked a trend toward an increase in both estradiol and LH levels...
January 11, 2018: Journal of Biochemical and Molecular Toxicology
keyword
keyword
2982
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"