journal
MENU ▼
Read by QxMD icon Read
search

Peptides

journal
https://www.readbyqxmd.com/read/28416297/cry-toxin-specificities-of-insect-abcc-transporters-closely-related-to-lepidopteran-abcc2-transporters
#1
Haruka Endo, Shiho Tanaka, Kazuhiro Imamura, Satomi Adegawa, Shingo Kikuta, Ryoichi Sato
In this study, we examined insect and human ABCC transporters closely related to the lepidopteran ABC transporter C2 (ABCC2), a powerful receptor for the Bacillus thuringiensis Cry toxin, for their responses to various Cry toxins. ABCC2 and the lepidopteran ABC transporter C3 (ABCC3) conferred cultured cells with susceptibility to a lepidopteran-specific Cry1Aa toxin but not to lepidopteran-specific Cry1Ca and Cry1Da. One coleopteran ABCC transporter specifically responded to a coleopteran-specific Cry8Ca toxin...
April 14, 2017: Peptides
https://www.readbyqxmd.com/read/28400226/in-vitro-effect-of-human-cathelicidin-antimicrobial-peptide-ll-37-on-dengue-virus-type-2
#2
K Alagarasu, P S Patil, P Shil, M Seervi, M B Kakade, H Tillu, A Salunke
Human Cathelicidin antimicrobial peptide LL-37 is known to have antiviral activity against many viruses. In the present study, we investigated the in-vitro effect of LL-37 on dengue virus type 2 (DENV-2) infection and replication in Vero E6 cells. To study the effect of pretreatment of virus or cells with LL-37, the virus was pretreated with different concentrations of LL-37 (2.5μM-15μM) or scrambled (Scr) LL-37(5μM-15μM) and used for infection or the cells were first treated with LL-37 and infected. To study the effect of LL-37 post infection (PI), the cells were infected first followed by addition of LL-37 to the culture medium 24h after infection...
April 9, 2017: Peptides
https://www.readbyqxmd.com/read/28400225/pegylated-neuromedin-u-8-shows-long-lasting-anorectic-activity-and-anti-obesity-effect-in-mice-by-peripheral-administration
#3
Yasushi Masuda, Satoshi Kumano, Jiro Noguchi, Kotaro Sakamoto, Hiroshi Inooka, Tetsuya Ohtaki
Neuromedin U (NMU) is a neuropeptide found in the brain and gastrointestinal tract. The NMU system has been shown to regulate energy homeostasis by both a central and a peripheral mechanism. Peripheral administration of human NMU-25 was recently shown to inhibit food intake in mice. We examined the possibility that other NMU-related peptides exert an anorectic activity by intraperitoneal (i.p.) administration. We found that rat NMU-23 and its structurally-related peptide rat neuromedin S (NMS) significantly reduced food intake in lean mice, whereas NMU-8, an active fragment of the octapeptide sequence conserved in porcine, human and mouse NMU, had no effect...
April 8, 2017: Peptides
https://www.readbyqxmd.com/read/28363796/structure-constrained-endomorphin-analogs-display-differential-antinociceptive-mechanisms-in-mice-after-spinal-administration
#4
Yuan Wang, Jingjing Zhou, Xin Liu, Long Zhao, Zhaojuan Wang, Xianghui Zhang, Kezhou Wang, Linqing Wang, Rui Wang
We previously reported a series of novel endomorphin analogs with unnatural amino acid modifications. These analogs display good binding affinity and functional activity toward the μ opioid receptor (MOP). In the present study, we further investigated the spinal antinociceptive activity of these compounds. The analogs were potent in several nociceptive models. Opioid antagonists and antibodies against several endogenous opioid peptides were used to determine the mechanisms of action of these peptides. Intrathecal pretreatment with naloxone and β-funaltrexamine (β-FNA) effectively inhibited analog-induced analgesia, demonstrating that activity of the analogs is regulated primarily through MOP...
March 29, 2017: Peptides
https://www.readbyqxmd.com/read/28363795/glucagon-like-petide-2-acts-on-colon-cancer-myofibroblasts-to-stimulate-proliferation-migration-and-invasion-of-both-myofibroblasts-and-cancer-cells-via-the-igf-pathway
#5
Marianne Shawe-Taylor, J Dinesh Kumar, Whitney Holden, Steven Dodd, Akos Varga, Olivier Giger, Andrea Varro, Graham J Dockray
Glucagon-like peptide (GLP)-2 stimulates intestinal epithelial proliferation by acting, in part, via IGF release from sub-epithelial myofibroblasts. The response of myofibroblasts to GLP-2 remains incompletely understood. We studied the action of GLP-2 on myofibroblasts from colon cancer and adjacent tissue, and the effects of conditioned medium from these cells on epithelial cell proliferation, migration and invasion. GLP-2 stimulated proliferation, migration and invasion of myofibroblasts and the proliferative and invasive responses of cancer-associated myofibroblasts were greater than those of myofibroblasts from adjacent tissue...
March 29, 2017: Peptides
https://www.readbyqxmd.com/read/28363794/adaptive-evolution-of-insect-selective-excitatory-%C3%AE-type-sodium-channel-neurotoxins-from-scorpion-venom
#6
Wenlan Wu, Zhongjie Li, Yibao Ma
Insect selective excitatory β-type sodium channel neurotoxins from scorpion venom (β-NaScTxs) are composed of about 70-76 amino acid residues and share a common scaffold stabilized by four unique disulfide bonds. The phylogenetic analysis of these toxins was hindered by limited sequence data. In our recent study, two new insect selective excitatory β-NaScTxs, LmIT and ImIT, were isolated from Lychas mucronatus and Isometrus maculatus, respectively. With the sequences previously reported, we examined the adaptive molecular evolution of insect selective excitatory β-NaScTxs by estimating the nonsynonymous-to-synonymous rate ratio (ω=dN/dS)...
March 28, 2017: Peptides
https://www.readbyqxmd.com/read/28363793/adiponectin-serum-saliva-associations-and-relations-with-oral-and-systemic-markers-of-inflammation
#7
Jenna L Riis, Crystal I Bryce, Thao Ha, Tracey Hand, John L Stebbins, Marla Matin, Katrin M Jaedicke, Douglas A Granger
This study addresses gaps in our understanding about the validity and utility of using salivary adiponectin to index serum adiponectin levels. Matched blood and saliva samples were collected on a single occasion from healthy adults (n=99; age 18-36 years, 53% male). Serum and saliva was assayed for adiponectin and inflammatory cytokines (IL-1β, IL-6, IL-8, TNFα), and saliva was also assayed for markers of blood contamination (transferrin), total protein (salivary flow rate) and matrix metalloproteinase-8 (MMP-8)...
March 28, 2017: Peptides
https://www.readbyqxmd.com/read/28300673/semi-microbiological-synthesis-of-an-active-lysinoalanine-bridged-analog-of-glucagon-like-peptide-1
#8
Anneke Kuipers, Louwe de Vries, Marcel P de Vries, Rick Rink, Tjibbe Bosma, Gert N Moll
Some modified glucagon-like-peptide-1 (GLP-1) analogs are highly important for treating type 2 diabetes. Here we investigated whether GLP-1 analogs expressed in Lactococcus lactis could be substrates for modification and export by the nisin dehydratase and transporter enzyme. Subsequently we introduced a lysinoalanine by coupling a formed dehydroalanine with a lysine and investigated the structure and activity of the formed lysinoalanine-bridged GLP-1 analog. Our data show: (i) GLP-1 fused to the nisin leader peptide is very well exported via the nisin transporter NisT, (ii) production of leader-GLP-1 via NisT is higher than via the SEC system, (iii) leader-GLP-1 exported via NisT was more efficiently dehydrated by the nisin dehydratase NisB than when exported via the SEC system, (iv) individual serines and threonines in GLP-1 are dehydrated by NisB to a significantly different extent, (v) an introduced Ser30 is well dehydrated and can be coupled to Lys34 to form a lysinoalanine-bridged GLP-1 analog, (vi) a lysinoalanine(30-34) variant's conformation shifts in the presence of 25% trifluoroethanol towards a higher alpha helix content than observed for wild type GLP-1 under identical condition, (vii) a lysinoalanine(30-34) GLP-1 variant has retained significant activity...
March 12, 2017: Peptides
https://www.readbyqxmd.com/read/28300672/discovery-of-three-toxin-peptides-with-kv1-3-channel-and-il-2-cytokine-inhibiting-activities-from-non-buthidae-scorpions-chaerilus-tricostatus-and-chaerilus-tryznai
#9
Li Ding, Jing Chen, Jinbo Hao, Jiahui Zhang, Xuejun Huang, Fangfang Hu, Zheng Wu, Yaru Liu, Wenxin Li, Zhijian Cao, Yingliang Wu, Jian Li, Shan Li, Hongyan Liu, Wenlong Wu, Zongyun Chen
Non-Buthidae venomous scorpions are huge natural sources of toxin peptides; however, only a few studies have been done to understand their toxin peptides. Herein, we describe three new potential immunomodulating toxin peptides, Ctri18, Ctry68 and Ctry2908, from two non-Buthidae scorpions, Chaerilus tricostatus and Chaerilus tryznai. Sequence alignment analyses showed that Ctri18, Ctry68 and Ctry2908 are three new members of the scorpion toxin α-KTx15 subfamily. Electrophysiological experiments showed that Ctri18, Ctry68 and Ctry2908 blocked the Kv1...
March 12, 2017: Peptides
https://www.readbyqxmd.com/read/28300674/structure-activity-studies-on-polymyxin-derivatives-carrying-three-positive-charges-only-reveal-a-new-class-of-compounds-with-strong-antibacterial-activity
#10
Martti Vaara, Timo Vaara, Jonathan M Tyrrell
Recent years have brought in an increased interest to develop improved polymyxins. The currently used polymyxins, i.e. polymyxin B and colistin (polymyxin E) are pentacationic lipopeptides that possess a cyclic heptapeptide part with three positive charges, a linear "panhandle" part with two positive charges, and a fatty acyl tail. Unfortunately, their clinical use is shadowed by their notable nephrotoxicity. We have previously developed a polymyxin derivative NAB739 which lacks the positive charges in the linear part...
March 11, 2017: Peptides
https://www.readbyqxmd.com/read/28300671/the-effect-of-cart-on-pituitary-hormones-release-from-cultured-pituitary-cells-harvested-from-fasted-and-fed-ad-libitum-male-rats
#11
M Chmielowska, B Baranowska, E Wolinska-Witort, L Martynska, M Kalisz, A Litwiniuk, W Bik
Cocaine and Amphetamine-Regulated Transcript (CART) is widely expressed in the central nervous system and in several endocrine organs. CART is an important factor in the regulation of energy homeostasis. The aim of the study was to assess the role of CART in physiological response of pituitary cells in a course of starvation. The pituitary cells harvested from starved and fed ad libitum male rats were cultured for 48h and treated with: 0.1nM, 1nM, 10nM or 100nM doses of CART. The medium was collected after 60min and stored at -70°C until samples were further assayed for: LH, FSH, PRL, GH, TSH and ACTH...
March 11, 2017: Peptides
https://www.readbyqxmd.com/read/28279688/role-of-human-lipocalin-proteins-in-abdominal-obesity-after-acute-pancreatitis
#12
Ruma G Singh, Sayali A Pendharkar, Lindsay D Plank, Maxim S Petrov
Lipocalin proteins are small regulatory peptides implicated in metabolism, inflammation, and immunity. Although lipocalin proteins have been linked to various clinical conditions, their role in the acute inflammatory setting, such as acute pancreatitis (AP), has only been sparsely investigated. Two members of the lipocalin family, lipocalin-2 (LCN-2) and retinol binding protein -4 (RBP-4), play an important role in obesity and insulin resistance. In this study, we analysed circulating levels of LCN-2 and RBP-4 in 92 individuals after AP, of whom 41 individuals had abdominal obesity and 51 did not...
March 7, 2017: Peptides
https://www.readbyqxmd.com/read/28263851/the-effects-of-different-exercise-training-modalities-on-plasma-proenkephalin-peptide-f-in-women
#13
William H DuPont, William J Kraemer, Bradley C Nindl, Elaine C Lee, Maren S Fragala, Disa L Hatfield, Lydia K Caldwell, Emily M Post, Matthew K Beeler, Jeff S Volek, Carl M Maresh
Due to the important interactions of proenkephalin fragments (e.g., proenkephalin [107-140] Peptide F) to enhance activation of immune cells and potentially combat pain associated with exercise-induced muscle tissue damage, we examined the differential plasma responses of Peptide F to different exercise training programs. Participants were tested pre-training (T1), and after 8 weeks (T2) of training. Fifty-nine healthy women were matched and then randomly assigned to one of four groups: heavy resistance strength training (STR, n=18), high intensity endurance training (END, n=14), combined strength and endurance training (CMB, n=17), or control (CON, n=10)...
March 3, 2017: Peptides
https://www.readbyqxmd.com/read/28259659/bean-peptides-have-higher-in-silico-binding-affinities-than-ezetimibe-for-the-n-terminal-domain-of-cholesterol-receptor-niemann-pick-c1-like-1
#14
Luis M Real Hernandez, Elvira Gonzalez de Mejia
Niemann-Pick C1 like-1 (NPC1L1) mediates cholesterol absorption at the apical membrane of enterocytes through a yet unknown mechanism. Bean, pea, and lentil proteins are naturally hydrolyzed during digestion to produce peptides. The potential for pulse peptides to have high binding affinities for NPC1L1 has not been determined. In this study , in silico binding affinities and interactions were determined between the N-terminal domain of NPC1L1 and 14 pulse peptides (5≥ amino acids) derived through pepsin-pancreatin digestion...
March 1, 2017: Peptides
https://www.readbyqxmd.com/read/28242256/gastric-bypass-in-the-pig-increases-gip-levels-and-decreases-active-glp-1-levels
#15
Andreas Lindqvist, Mikael Ekelund, Stefan Pierzynowski, Leif Groop, Jan Hedenbro, Nils Wierup
Gastric bypass surgery results in remission of type 2 diabetes in the majority of patients. The incretin hormones glucagon-like peptide 1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP) have been implicated in the observed remission. Most knowledge so far has been generated in obese subjects. To isolate the surgical effects of gastric bypass on metabolism and hormone responses from the confounding influence of obesity, T2D, or food intake, we performed gastric bypass in lean pigs, using sham-operated and pair-fed pigs as controls...
February 24, 2017: Peptides
https://www.readbyqxmd.com/read/28237410/glucagon-like-peptide-1-glp-1-increases-in-plasma-and-colon-tissue-prior-to-estrus-and-circulating-levels-change-with-increasing-age-in-reproductively-competent-wistar-rats
#16
Michelle L Johnson, M Jill Saffrey, Victoria J Taylor
There is a well-documented association between cyclic changes to food intake and the changing ovarian hormone levels of the reproductive cycle in female mammals. Limited research on appetite-controlling gastrointestinal peptides has taken place in females, simply because regular reproductive changes in steroid hormones present additional experimental factors to account for. This study focussed directly on the roles that gastrointestinal-secreted peptides may have in these reported, naturally occurring, changes to food intake during the rodent estrous cycle and aimed to determine whether peripheral changes occurred in the anorexigenic (appetite-reducing) hormones peptide-YY (PYY) and glucagon-like peptide-1 (GLP-1) in female Wistar rats (32-44 weeks of age)...
February 22, 2017: Peptides
https://www.readbyqxmd.com/read/28223093/association-between-circulating-angiotensin-converting-enzyme-2-and-cardiac-remodeling-in-hypertensive-patients
#17
Shichao Li, Zhijun Wang, Xiuhong Yang, Bo Hu, Yuling Huang, Sujing Fan
BACKGROUND: Angiotensin-converting enzyme 2 (ACE2) plays a vital role in the pathogenesis of hypertension-induced cardiac remodeling and exhibits cardioprotective properties in hypertensive animal models. Evidence that ACE2 is an important regulator of hypertensive cardiac remodeling in humans has not been addressed directly yet. METHODS: A total of 161 patients with essential hypertension and 47 age- and sex-matched normotensive healthy subjects were consecutively recruited...
February 20, 2017: Peptides
https://www.readbyqxmd.com/read/28223092/obestatin-improves-oxidative-brain-damage-and-memory-dysfunction-in-rats-induced-with-an-epileptic-seizure
#18
Türkan Koyuncuoğlu, Caner Vızdıklar, Doğan Üren, Hakan Yılmaz, Çağan Yıldırım, Sefa Semih Atal, Dilek Akakın, Elif Kervancıoğlu Demirci, Meral Yüksel, Berrak Ç Yeğen
Obestatin was shown to alleviate renal, gastrointestinal and haemorrhage-induced brain injury in rats. In order to investigate the neuroprotective effects of obestatin on seizure-induced oxidative brain injury, an epileptic seizure was induced with a single intraperitoneal (i.p.) dose of pentylenetetrazole (PTZ, 45mg/kg) in male Wistar rats. Thirty minutes before the PTZ injection, rats were treated with either saline or obestatin (1μg/kg, i.p.). Seizure was video-taped and then evaluated by using Racine's scoring (0-5)...
February 20, 2017: Peptides
https://www.readbyqxmd.com/read/28219696/irisin-in-goldfish-carassius-auratus-effects-of-irisin-injections-on-feeding-behavior-and-expression-of-appetite-regulators-uncoupling-proteins-and-lipoprotein-lipase-and-fasting-induced-changes-in-fndc5-expression
#19
Zahndra Diann Butt, Jessica Dalton Hackett, Hélène Volkoff
Irisin is a peptide cleaved from the fibronectin type III domain containing protein 5 (FNDC5) gene that is secreted predominantly by muscle cells but also by other tissues including brain and intestine. In mammals, irisin has been shown to have thermogenic actions via the modulation of uncoupling proteins (UCPs) and to affect feeding and energy homeostasis via actions in brain, adipose tissue, liver, muscle and gastrointestinal tract. To examine the role of irisin on feeding and metabolism in fish, the effects of peripheral (intraperitoneal) injections of irisin on feeding behavior, glucose levels and the mRNA expressions of appetite regulators (cocaine and amphetamine regulated transcript CART, agouti related protein AgRP, orexin), UCPs and lipoprotein lipase LPL and brain factors (brain-derived neurotrophic factor , BDNF and tyrosine hydroxylase TH) were assessed in brain, white muscle and intestine...
February 20, 2017: Peptides
https://www.readbyqxmd.com/read/28219695/inhibitory-effects-of-dynorphin-3-14-on-the-lipopolysaccharide-induced-toll-like-receptor-4-signalling-pathway
#20
Siti Sarah Fazalul Rahiman, Michael Morgan, Paul Gray, Paul Nicholas Shaw, Peter John Cabot
Dynorphin 1-17 (DYN 1-17) is biotransformed rapidly to a range of fragments in rodent inflamed tissue with dynorphin 3-14 (DYN 3-14) being the most stable and prevalent. DYN 1-17 has been shown previously to be involved in the regulation of inflammatory response following tissue injury, in which the biotransformation fragments of DYN 1-17 may possess similar features. This study investigated the effects of DYN 3-14 on lipopolysaccharide (LPS)-induced nuclear factor-kappaB/p65 (NF-κB/p65) nuclear translocation and the release of pro-inflammatory cytokines interleukin-1beta (IL-1β) and tumor necrosis factor-alpha (TNF-α) in differentiated THP-1 cells...
February 20, 2017: Peptides
journal
journal
28024
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"