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Vitamin c

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https://www.readbyqxmd.com/read/29677454/combined-but-not-the-single-administration-of-vitamin-c-and-l-carnitine-ameliorates-cisplatin-induced-gastric-mucosa-damage-in-male-rats
#1
Modinat Adebukola Adefisayo, Wale Johnson Adeyemi, Quadri Kunle Alabi
Although cisplatin is a potent anticancer drug, it instigates oxidative and pro-inflammatory reactions which poses significant and distressing clinical symptoms in patients including nausea and vomiting which is related to damage of the gastric mucosa. This study investigated the effects of vitamin C and/or L-carnitine on cisplatin-induced gastric mucosa damage in rat. The rats were allocated into groups (n=5): a control group received distilled water and treatment groups received cisplatin (CIP) alone, cisplatin followed by vitamin C, L-carnitine or their combination...
April 20, 2018: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/29677309/vitamin-d-calcium-or-combined-supplementation-for-the-primary-prevention-of-fractures-in-community-dwelling-adults-us-preventive-services-task-force-recommendation-statement
#2
David C Grossman, Susan J Curry, Douglas K Owens, Michael J Barry, Aaron B Caughey, Karina W Davidson, Chyke A Doubeni, John W Epling, Alex R Kemper, Alex H Krist, Martha Kubik, Seth Landefeld, Carol M Mangione, Michael Silverstein, Melissa A Simon, Chien-Wen Tseng
Importance: Because of the aging population, osteoporotic fractures are an increasingly important cause of morbidity and mortality in the United States. Approximately 2 million osteoporotic fractures occurred in the United States in 2005, and annual incidence is projected to increase to more than 3 million fractures by 2025. Within 1 year of experiencing a hip fracture, many patients are unable to walk independently, more than half require assistance with activities of daily living, and 20% to 30% of patients will die...
April 17, 2018: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/29677308/vitamin-d-calcium-or-combined-supplementation-for-the-primary-prevention-of-fractures-in-community-dwelling-adults-evidence-report-and-systematic-review-for-the-us-preventive-services-task-force
#3
Leila C Kahwati, Rachel Palmieri Weber, Huiling Pan, Margaret Gourlay, Erin LeBlanc, Manny Coker-Schwimmer, Meera Viswanathan
Importance: Osteoporotic fractures result in significant morbidity and mortality. Objective: To update the evidence for benefits and harms of vitamin D, calcium, or combined supplementation for the primary prevention of fractures in community-dwelling adults to inform the US Preventive Services Task Force. Data Sources: PubMed, EMBASE, Cochrane Library, and trial registries through March 21, 2017; references; and experts. Surveillance continued through February 28, 2018...
April 17, 2018: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/29676609/generation-of-life-in-a-test-tube-albert-szent-gyorgyi-bruno-straub-and-the-discovery-of-actin
#4
Jack A Rall
This is a story about a great scientist, luck, great discovery that changed the future direction of muscle research, war, a clandestine war mission, postwar politics, and an attempt to rewrite scientific history. Albert Szent-Gyorgyi, at 44 yr of age, won the Nobel Prize in 1937 for his work on vitamin C and the establishment of the groundwork of the citric acid cycle. He now wanted to investigate one of the fundamental aspects of life and settled on the study of muscle contraction. The Szent-Gyorgyi laboratory in Hungary during World War II demonstrated that contraction could be reproduced in vitro by threads consisting of just two proteins, myosin and the newly discovered protein by Bruno Straub that they called actin...
June 1, 2018: Advances in Physiology Education
https://www.readbyqxmd.com/read/29676471/vitamin-d3-regulates-steroidogenesis-in-granulosa-cells-through-amp-activated-protein-kinase-ampk-activation-in-a-mouse-model-of-polycystic-ovary-syndrome
#5
Shabnam Bakhshalizadeh, Fardin Amidi, Reza Shirazi, Maryam Shabani Nashtaei
Polycystic ovary syndrome (PCOS) is an endocrine and metabolic disorder in reproductive-aged women. Hormonal abnormality caused by steroidogenesis disturbances appears to be the main culprit of the clinical picture in PCOS. Vitamin D3 could regulate steroidogenesis in granulosa cells, but the mechanism of action of vitamin D3 on steroidogenesis remains unknown. AMP-activated protein kinase (AMPK) has a modulating role in steroid hormone production. We investigated the effect of vitamin D3 on steroidogenesis in cultured granulosa cells of dehydroepiandrosterone-induced PCOS mice and studied the involvement of AMPK signalling pathway in the current process...
April 20, 2018: Cell Biochemistry and Function
https://www.readbyqxmd.com/read/29675013/development-of-chemically-defined-media-reveals-citrate-as-preferred-carbon-source-for-liberibacter-growth
#6
Maritsa Cruz-Munoz, Joseph R Petrone, Alexa R Cohn, Alam Munoz-Beristain, Nabil Killiny, Jennifer C Drew, Eric W Triplett
Liberibacter crescens is the closest cultured relative of four important uncultured crop pathogens. Candidatus L. asiaticus, L. americanus, and L. africanus are causal agents of citrus greening disease, otherwise known as huanglongling (HLB). Candidatus L. solanacearum is responsible for potato Zebra chip disease. Cultures of L. crescens grow slowly on BM-7 complex medium, while attempts to culture the Ca. Liberibacter pathogens in BM-7 have failed. Developing a defined medium for the growth of L. crescens will be useful in the study of Liberibacter metabolism and will improve the prospects for culturing the Ca ...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29673831/association-of-hypovitaminosis-d-with-triceps-brachii-muscle-fatigability-among-older-women-findings-from-the-epidos-cohort
#7
G Duval, Y Rolland, A M Schott, H Blain, P Dargent-Molina, S Walrand, G Duque, C Annweiler
BACKGROUND: Vitamin D affects physical performance in older adults. Its effects on muscles, notably on muscle strength, remain unclear. The objective of this cross-sectional study was to determine whether hypovitaminosis D is associated with triceps brachii muscle fatigability in community-dwelling older women. METHODS: A randomized subset of 744 women aged ≥75years from the EPIDOS cohort was categorized into two groups according to triceps brachii muscle fatigability, defined as loss of strength >5% between two consecutive maximal isometric voluntary contractions...
May 2018: Maturitas
https://www.readbyqxmd.com/read/29673661/vitamin-c-attenuates-negative-effects-of-vitrification-on-sperm-parameters-chromatin-quality-apoptosis-and-acrosome-reaction-in-neat-and-prepared-normozoospermic-samples
#8
Esmat Mangoli, Ali Reza Talebi, Morteza Anvari, Fatemeh Taheri, Mahboobeh Vatanparast, Tahereh Rahiminia, Akram Hosseini
OBJECTIVE: Aim of this study was to evaluate the effects of vitamin C on sperm parameters, sperm chromatin quality and apoptosis resulted of vitrification in neat semen and prepared spermatozoa of normozoospermic samples. MATERIAL AND METHODS: Forty semen samples from normozoospermic men were included in this prospective study. Each sample was divided into five groups. Group I: control or fresh semen, group II: semen prepared by swim-up method and then vitrified, group III: neat semen was vitrified, group IV: vitamin C (600 μM) was added to prepared spermatozoa and then vitrified and group V: vitamin C (600 μM) was added to neat semen and then vitrified...
April 2018: Taiwanese Journal of Obstetrics & Gynecology
https://www.readbyqxmd.com/read/29673592/intravenous-vitamin-c-attenuates-hemorrhagic-shock-related-renal-injury-through-the-induction-of-sirt1-in-rats
#9
Meng-Zhi Qi, Yi Yao, Rong-Li Xie, Si-Lei Sun, Wen-Wu Sun, Jin-Long Wang, Ying Chen, Bing Zhao, Er-Zhen Chen, En-Qiang Mao
To investigate the effect of intravenous Vitamin C (VC) on hemorrhagic shock (HS)-associated rat renal injury and the involved mechanism. Thirty SD rats were randomly assigned to the sham surgery (sham), hemorrhagic shock (HS), HS+100 mg/kg VC (H + VL), HS+500 mg/kg VC (H + VH) and HS+100 mg/kg VC + EX527 (H + VL + E) groups. Tissue and blood samples were collected 6 h after surgery. Kidney pathological changes were scored. Creatinine (CRE), blood urea nitrogen (BUN), tumor necrosis factor-α (TNF-α), and interleukin-1β (IL-1β) levels in serum and Vitamin C levels and superoxide dismutase (SOD) activity and the ability to suppress hydroxyl radical (RAFHR) in plasma were measured...
April 16, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29673142/meeting-vitamin-d-requirements-in-white-caucasians-at-uk-latitudes-providing-a-choice
#10
Ann R Webb, Andreas Kazantzidis, Richard C Kift, Mark D Farrar, Jack Wilkinson, Lesley E Rhodes
The body gains vitamin D through both oral intake (diet/supplementation) and synthesis in skin upon exposure to ultraviolet radiation (UVR). Sun exposure is the major source for most people even though sun exposure is complex and limited by climate and culture. We aimed to quantify the sun exposure required to meet vitamin D targets year-round and determine whether this can be safely achieved in a simply defined manner in the UK as an alternative to increasing vitamin D oral intake. Data from observation (sun exposure, diet, and vitamin D status) and UVR intervention studies performed with white Caucasian adults were combined with modeled all-weather UVR climatology...
April 17, 2018: Nutrients
https://www.readbyqxmd.com/read/29672394/effects-of-vitamin-b-complex-and-vitamin-c-on-human-skin-cells-is-the-perceived-effect-measurable
#11
Julian-Dario Rembe, Carolin Fromm-Dornieden, Ewa Klara Stuermer
OBJECTIVE: Vitamins are essential for human health. In terms of local application for wound healing, vitamins' positive effect remains unclear. However, because of the regular appearance of nutritional deficiency in chronic wound patients, a favorable impact of locally applied vitamins can be hypothesized. METHODS: Vitamins B3, B5, B6, B7, B9, B10, B12, and C individually as well as different combinations of B vitamins were investigated regarding their ability to promote proliferation and migration of human skin fibroblasts and keratinocytes...
May 2018: Advances in Skin & Wound Care
https://www.readbyqxmd.com/read/29671762/increased-level-of-%C3%AE-2-6-sialylated-glycans-on-hacat-cells-induced-by-titanium-dioxide-nanoparticles-under-uv-radiation
#12
Yuanyuan Ren, Xin Liu, Runqing Geng, Qunwei Lu, Rong Rao, Xi Tan, Xiangliang Yang, Wei Liu
As one of the most widely used nanomaterials, the safety of nano-TiO₂ for human beings has raised concern in recent years. Sialylation is an important glycosylation modification that plays a critical role in signal transduction, apoptosis, and tumor metastasis. The aim of this work was to investigate the cytotoxicity and phototoxicity of nano-TiO₂ with different crystalline phases for human skin keratinocytes (HaCaT cells) under ultraviolet (UV) irradiation and detect sialic acid alterations. The results showed that the mixture of crystalline P25 had the highest cytotoxicity and phototoxicity, followed by pure anatase A25, whereas pure rutile R25 had the lowest cytotoxicity and phototoxicity...
April 19, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29671368/the-efficacy-of-topical-human-amniotic-membrane-mesenchymal-stem-cell-conditioned-medium-hammsc-cm-and-a-mixture-of-topical-hammsc-cm-vitamin-c-and-hammsc-cm-vitamin-e-on-chronic-plantar-ulcers-in-leprosy-a-randomized-control-trial
#13
Crs Prakoeswa, F R Natallya, D Harnindya, A Thohiroh, R N Oktaviyanti, K D Pratiwi, M A Rubianti, B Yogatri, P I Primasari, N Herwanto, M D Alinda, B H Kusumaputra, L Astari, M Y Listiawan, I Agusni, F A Rantam
BACKGROUND: Healing of chronic plantar ulcers in leprosy (CPUL) typically takes a long time due to impaired neurological function, thereby reducing the levels of growth factors and cytokines. Cytokines can be found in metabolite products from amniotic membrane stem cells. Chronic ulcers are frequently characterized by high levels of reactive oxygen species. Vitamin E (α-tocopherol) is widely used in skin lesions, owing to its antioxidant and anti-inflammatory properties. Vitamin C also has antioxidant, anti-inflammatory, and collagen synthesis properties useful in wound healing...
April 19, 2018: Journal of Dermatological Treatment
https://www.readbyqxmd.com/read/29671362/preparation-and-evaluation-of-a-chitosan-coated-antioxidant-liposome-containing-vitamin-c-and-folic-acid
#14
Zhen Jiao, Xiudong Wang, Yuting Yin, Jingxin Xia, Yanan Mei
Vitamin C (VC) and folic acid (FA) are the important nutrient and antioxidant in human body. In order to improve their stability, their co-loaded liposomes (VCFA-Lip) and chitosan-coated liposomes (CS-VCFA-Lip) are prepared and characterized. The mean particle size of VCFA-Lip and CS-VCFA-Lip is 138nm and 249nm, respectively. The encapsulation efficiencies of both drugs for CS-VCFA-Lip are much higher than those for VCFA-Lip. Furthermore, the experimental results show that the antioxidant activity of CS-VCFA-Lip is higher than that of VCFA-Lip...
April 19, 2018: Journal of Microencapsulation
https://www.readbyqxmd.com/read/29671173/cornus-mas-l-fruit-as-a-potential-source-of-natural-health-promoting-compounds-physico-chemical-characterisation-of-bioactive-components
#15
Marta De Biaggi, Dario Donno, Maria Gabriella Mellano, Isidoro Riondato, Ernest N Rakotoniaina, Gabriele L Beccaro
Interest in new sources of anti-inflammatory and antioxidant compounds has recently become a major research issue, with the cornelian cherry (Cornus mas L.) receiving particular attention for its significant amounts of phenolic compounds and vitamins, which exhibit a wide range of biological and pharmacological properties. This study was aimed at increasing knowledge regarding the cornelian cherry in Italy through the analysis of biologically active substances in the locally available genotype "Chieri"...
April 19, 2018: Plant Foods for Human Nutrition
https://www.readbyqxmd.com/read/29671011/-rectal-bleeding-in-a-60-year-old-woman-under-anticoagulation-and-platelet-aggregation-inhibition
#16
J Pohlan, N Willamowski, C Jürgensen, E Zimmermann, M Möckel
CASE REPORT: We report on a woman with lower gastrointestinal bleeding under effective oral anticoagulation with both phenprocoumon and apixaban (with intention to switch to the latter) as well as the antiplatelet agent acetylsalicylic acid for aortic bifurcation kissing stents after stent thrombosis. Our patient presented with weakness and rectal bleeding. Upon examination, she looked anemic and had sinus tachycardia (104 beats per minute). The digital rectal examination revealed bright red blood mixed with clots...
April 18, 2018: Der Internist
https://www.readbyqxmd.com/read/29670619/an-optimized-method-to-generate-human-active-osteoclasts-from-peripheral-blood-monocytes
#17
Dina Abdallah, Marie-Laure Jourdain, Julien Braux, Christine Guillaume, Sophie C Gangloff, Jacky Jacquot, Frédéric Velard
Osteoclasts (OCs), the bone-resorbing cells, play a key role in skeletal development and adult bone remodeling. They also participate in the pathogenesis of various bone disorders. One of the major technical difficulties in the generation of OCs, when working on human material, is the ability to achieve large differentiation of mature OCs from human peripheral blood mononuclear cells (PBMCs). Access to a standardized source of active OCs is needed to better analyze the roles of human OCs. The aim of this study was to develop a procedure yielding active and mature OCs from fresh human PBMCs...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29669566/apa-i-polymorphism-in-vdr-gene-is-related-to-metabolic-syndrome-in-polycystic-ovary-syndrome-a-cross-sectional-study
#18
Betânia Rodrigues Santos, Sheila Bunecker Lecke, Poli Mara Spritzer
BACKGROUND: Polycystic ovary syndrome (PCOS) is a common endocrine disorder determined by polygenic traits as well as environmental factors. Lower vitamin D levels have been detected in PCOS women and related to hormone and metabolic disturbances. Vitamin D acts in tissues through the vitamin D receptor (VDR). VDR gene variants have been associated with worse metabolic profile in the general population. We investigated the genotype and haplotype distribution of the Bsm-I (rs1544410), Apa-I (rs7975232), and Taq-I (rs731236) VDR gene polymorphisms in PCOS and non-hirsute women from southern Brazil...
April 18, 2018: Reproductive Biology and Endocrinology: RB&E
https://www.readbyqxmd.com/read/29668805/influence-of-hesperidin-and-vitamin-c-on-glycemic-parameters-lipid-profile-and-dna-damage-in-rats-treated-with-sucrose-overload
#19
Silvia I R Franke, Patrícia Molz, Camila Mai, Joel H Ellwanger, Fernanda F Zenkner, Jorge A Horta, Daniel Prá
We evaluated the influence of hesperidin and vitamin C (VitC) on glycemic parameters, lipid profile, and DNA damage in male Wistar rats treated with sucrose overload. Rats were divided into six experimental groups: I-water control; II-sucrose control; III-hesperidin control; IV-VitC control; V-co-treatment of sucrose plus hesperidin; VI-co-treatment of sucrose plus VitC. We measured the levels of triglycerides, total cholesterol, HDL-c, LDL-c, fasting glucose, and glycated hemoglobin (A1C). DNA damage was evaluated in blood and brain cells using the comet assay and the micronucleus test was used to evaluate chromosomal damages in the rat bone marrow...
April 16, 2018: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/29667503/effects-of-noble-metal-nanoparticles-on-the-hydroxyl-radical-scavenging-ability-of-dietary-antioxidants
#20
Hui Zhang, Xiumei Jiang, Gaojuan Cao, Xiaowei Zhang, Timothy R Croley, Xiaochun Wu, Jun-Jie Yin
Noble metal nanoparticles (NPs) have been widely used in many consumer products. Their effects on the antioxidant activity of commercial dietary supplements have not been well evaluated. In this study, we examined the effects of gold (Au NPs), silver (Ag NPs), platinum (Pt NPs), and palladium (Pd NPs) on the hydroxyl radical (·OH) scavenging ability of three dietary supplements vitamin C (L-ascorbic acid, AA), (-)-epigallocatechin gallate (EGCG), and gallic acid (GA). By electron spin resonance (ESR) spin-trapping measurement, the results show that these noble metal NPs can inhibit the hydroxyl radical scavenging ability of these dietary supplements...
April 3, 2018: Journal of Environmental Science and Health. Part C, Environmental Carcinogenesis & Ecotoxicology Reviews
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