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https://www.readbyqxmd.com/read/28531362/a-trial-of-oral-nifedipine-and-oral-labetalol-in-preeclampsia-hypertensive-emergency-treatment
#1
Jorge Duro-Gómez, Ana B Rodríguez-Marín, Mercedes Giménez de Azcárete, Lourdes Duro-Gómez, Claudio Hernández-Angeles, José E Arjona-Berral, Camil Castelo-Branco
This observational retrospective cohort study was conducted to compare oral nifedipine and labetalol for emergency treatment of hypertension in preeclamptic patients. Time (minutes) and necessary doses were outlined to achieve blood pressure lower than 150/95 mmHg. In 14 patients with preeclampsia, 55 hypertensive emergencies were identified (BP >150/95). Of these emergencies, 43 were treated with oral nifedipine 10 mg (10 patients) and 12 with oral labetalol 100 mg (4 patients). To achieve a target blood pressure under 150/95, these doses were repeated as necessary every 20 min, up to a maximum of 4 doses...
May 20, 2017: Journal of Obstetrics and Gynaecology: the Journal of the Institute of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/28526517/regulation-of-rhoa-rock-and-sustained-arterial-contraction-by-low-cytosolic-ca-2-levels-during-prolonged-depolarization-of-arterial-smooth-muscle
#2
Cristina Porras-González, Antonio Ordóñez, Antonio Castellano, Juan Ureña
The role of L-type Ca(2+) channels (LTCCs) and RhoA/Rho kinase (ROCK) on depolarization-induced sustained arterial contraction lasting several minutes is already known. However, in vivo, vascular smooth muscle cells can be depolarized for longer periods, inducing substantial inactivation of LTCCs and markedly reducing Ca(2+) influx into the myocytes. We have examined, in femoral arterial rings, the role of LTCCs and RhoA/ROCK during long-lasting depolarization. Our results reveal a new vasoreactive response after 20-30min of depolarization in 2...
May 16, 2017: Vascular Pharmacology
https://www.readbyqxmd.com/read/28524699/comparison-of-ambulatory-blood-pressure-lowering-effects-of-higher-doses-of-different-calcium-antagonists-in-uncontrolled-hypertension-the-calcium-antagonist-controlled-release-high-dose-therapy-in-uncontrolled-refractory-hypertensive-patients-carillon-study
#3
Hiroyuki Mizuno, Satoshi Hoshide, Naoko Tomitani, Kazuomi Kario
BACKGROUND: Data are sparse regarding ambulatory blood pressure (BP) reduction of up-titration from a standard dose to a high dose in both nifedipine controlled-release (CR) and amlodipine. This was a prospective, randomized, multicenter, open-label trial. PATIENTS AND METHODS: Fifty-one uncontrolled hypertensives medicated by two or more antihypertensive drugs including a renin-angiotensin system inhibitor and a calcium antagonist were randomly assigned to either the nifedipine CR (80 mg)/candesartan (8 mg) group or the amlodipine (10 mg)/candesartan (8 mg) group...
May 19, 2017: Blood Pressure
https://www.readbyqxmd.com/read/28515420/vascular-remodelling-relates-to-an-elevated-oscillatory-shear-index-and-relative-residence-time-in-spontaneously-hypertensive-rats
#4
Zhiyan Chen, Haiyi Yu, Yue Shi, Minjia Zhu, Yueshen Wang, Xi Hu, Youyi Zhang, Yu Chang, Ming Xu, Wei Gao
Haemodynamic disorders are common clinical findings in hypertension and lead to adverse cardiovascular events. However, the haemodynamic conditions in hypertension models are poorly understood. This study aimed to observe the characteristics of haemodynamics in spontaneously hypertensive rats (SHRs) and antihypertensive-treated SHRs. Twenty-four adult male SHRs and Wistar-Kyoto rats (WKYs) were randomly divided into four groups and treated for 7 days as follows: WKY-CON (WKYs + saline), WKY-NIF (WKYs + nifedipine, 50 mg/kg/day), SHR-CON (SHRs + saline), and SHR-NIF (SHRs + nifedipine)...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28515126/radiomanganese-pet-detects-changes-in-functional-%C3%AE-cell-mass-in-mouse-models-of-diabetes
#5
Reinier Hernandez, Stephen A Graves, Trillian Gregg, Halena R VanDeusen, Rachel J Fenske, Haley N Wienkes, Christopher G England, Hector F Valdovinos, Justin J Jeffery, Todd E Barnhart, Gregory W Severin, Robert J Nickles, Michelle E Kimple, Matthew J Merrins, Weibo Cai
The noninvasive measurement of functional β-cell mass would be clinically valuable for monitoring the progression of type 1 and type 2 diabetes, as well as the viability of transplanted insulin-producing cells. Although previous work employing magnetic resonance imaging has shown promise for functional β-cell mass determination through voltage-dependent Ca(2+) channel (VDCC)-mediated internalization of Mn(2+), the clinical utility of this technique is limited by the cytotoxic levels of Mn(2+) contrast agent...
May 17, 2017: Diabetes
https://www.readbyqxmd.com/read/28514967/at1-receptor-response-to-non-saturating-ang-ii-concentrations-is-amplified-by-calcium-channel-blockers
#6
Kristoffer Bernhem, Kalaiselvan Krishnan, Alexander Bondar, Hjalmar Brismar, Anita Aperia, Lena Scott
BACKGROUND: Blockers of angiotensin II type 1 receptor (AT1R) and the voltage gated calcium channel 1.2 (CaV1.2) are commonly used for treatment of hypertension. Yet there is little information about the effect of physiological concentrations of angiotensin II (AngII) on AT1R signaling and whether there is a reciprocal regulation of AT1R signaling by CaV1.2. METHODS: To elucidate these questions, we have studied the Ca(2+) signaling response to physiological and pharmacological AngII doses in HEK293a cells, vascular smooth muscle cells and cardiomyocytes using a Ca(2+) sensitive dye as the principal sensor...
May 17, 2017: BMC Cardiovascular Disorders
https://www.readbyqxmd.com/read/28514300/increasing-efficacy-and-reducing-side-effects-in-treatment-of-chronic-anal-fissures-a-study-of-topical-diazepam-therapy
#7
Minh Tuan H Hang, Betsy E Smith, Carson Keck, Ali Keshavarzian, Shahriar Sedghi
This is a single institution nonexperimental study intended to analyze the therapeutic efficacy of topical diazepam in treating symptoms of chronic anal fissures.Anal fissures are a common cause of anal pain. Conventional treatments include nonsteroidal anti-inflammatory drugs, topical creams, such as nitroglycerin and nifedipine, and surgery. However, these treatments are usually suboptimally efficacious or have deterring side effects.Patients at an outpatient community center with a diagnosis of a chronic anal fissure were prescribed either topical 2% (n = 19) or 4% (n = 18) diazepam cream between January 2013 and February 2015...
May 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28499681/is-nifedipine-as-a-tocolytic-effective-in-facilitating-in-utero-transfer
#8
Jodie Martin, Jodie Mills, David Stanley
OBJECTIVE: Previous studies have reported that air medical transfer of women in preterm labor can be safely accomplished, without preterm birth occurring; in fact, many women were later discharged without preterm birth occurring. The purpose of this study was to determine if nifedipine, when used as a tocolytic, is effective at facilitating in utero transfer of women in preterm labor in the Top End of the Northern Territory of Australia. METHODS: This was a retrospective descriptive study over a 3-year period of all women transported in preterm labor between 23 + 6 to 36 + 6 weeks' gestation of pregnancy (N = 325)...
May 2017: Air Medical Journal
https://www.readbyqxmd.com/read/28493876/the-effect-of-sphingosine-1-phosphate-on-colonic-smooth-muscle-contractility-modulation-by-tnbs-induced-colitis
#9
Aishah Al-Jarallah, Mabayoje Oriowo
AIM: Increased levels of circulating sphingosine-1-phosphate (S1P) have been reported in ulcerative colitis. The objective of this study was to examine the effect of S1P on colonic smooth muscle contractility and how is it affected by colitis. METHODS: Colonic inflammation was induced by intrarectal administration of trinitrobenzene sulfonic acid. Five days later colon segments were isolated and used for contractility experiments and immunoblotting. RESULTS: S1P contracted control and inflamed colon segments and the contraction was significantly greater in inflamed colon segments...
2017: PloS One
https://www.readbyqxmd.com/read/28489944/studying-the-crystallization-of-various-polymorphic-forms-of-nifedipine-from-binary-mixtures-with-the-use-of-different-experimental-techniques
#10
O Madejczyk, E Kaminska, M Tarnacka, M Dulski, K Jurkiewicz, K Kaminski, M Paluch
In this paper the crystal growth of nifedipine from pure system and from binary mixtures composed of active substance (API) and two acetylated disaccharides, maltose and sucrose (NIF-acMAL, NIF-acSUC, 5:1 weight ratio), was investigated. Optical snapshots supported by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) measurements showed that mainly β and α forms of nifedipine grow up in all investigated samples. They also revealed that the morphology of growing crystals strongly depends on the presence of modified carbohydrates and temperature conditions...
May 18, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28479286/pdbu-induced-pkc-activation-triggers-sustained-contracture-in-human-myometrium-in-vitro
#11
Laurence Massenavette, Wilène Paul, Stéphanie Corriveau, Jean-Charles Pasquier, Éric Rousseau
BACKGROUND: Although physiological transition from rhythmic contractions to uterine retraction postpartum remains a poorly understood process, it has been shown that the latter is essential in the prevention of hemorrhage and its negative consequences. OBJECTIVE: This study aimed to investigate the transition from oscillatory contractions to tonic contracture in human myometrium after delivery; a mechanism purported to facilitate postpartum hemostasis. Protein Kinase C (PKC) plays a key regulatory role in human uterine contractions since it can prevent dephosphorylation of regulatory proteins and sensitize the contractile machinery to low Ca2+...
May 4, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28472069/detection-of-trpv4-channel-current-like-activity-in-fawn-hooded-hypertensive-fhh-rat-cerebral-arterial-muscle-cells
#12
Debebe Gebremedhin, David X Zhang, Dorothee Weihrauch, Nnamdi N Uche, David R Harder
The transient receptor potential vallinoid type 4 (TRPV4) is a calcium entry channel known to modulate vascular function by mediating endothelium-dependent vasodilation. The present study investigated if isolated cerebral arterial myocytes of the Fawn Hooded hypertensive (FHH) rat, known to display exaggerated KCa channel current activity and impaired myogenic tone, express TRPV4 channels at the transcript and protein level and exhibit TRPV4-like single-channel cationic current activity. Reverse transcription polymerase chain reaction (RT-PCR), Western blot, and immunostaining analysis detected the expression of mRNA transcript and translated protein of TRPV4 channel in FHH rat cerebral arterial myocytes...
2017: PloS One
https://www.readbyqxmd.com/read/28468029/effect-of-protriptyline-on-ca%C3%A2-%C3%A2-%C2%BA-i-and-viability-in-mdck-renal-tubular-cells
#13
He-Hsiung Cheng, Chiang-Ting Chou, Wei-Zhe Liang, Chun-Chi Kuo, Pochuen Shieh, Jue-Long Wang, Chung-Ren Jan
Protriptyline has been used as an antidepressant. Clinically it has been prescribed in the auxiliary treatment of cancer patients. However, its effect on Ca²⁺ signaling and related physiology is unknown in renal cells. This study examined the effect of protriptyline on cytosolic free Ca²⁺ concentrations ([Ca²⁺]i) and viability in Madin-Darby canine kidney (MDCK) tubular cells. Protriptyline induced [Ca²⁺]i rises concentration-dependently. The response was reduced by 20% by removing extracellular Ca²⁺...
April 30, 2017: Chinese Journal of Physiology
https://www.readbyqxmd.com/read/28467360/nimodipine-but-not-nifedipine-promotes-expression-of-fatty-acid-2-hydroxylase-in-a-surgical-stress-model-based-on-neuro2a-cells
#14
Eva Herzfeld, Lea Speh, Christian Strauss, Christian Scheller
Nimodipine is well characterized for the management of aneurysmal subarachnoid hemorrhage and has been shown to promote a better outcome and less delayed ischemic neurological deficits. Animal and clinical trials show neuroprotective efficacy following nerve injuries. We showed a neuroprotective effect on Neuro2a cells. Subsequent microarray analysis revealed-among others-fatty acid 2-hydroxylase (FA2H) upregulated by nimodipine in vitro, which is a component of myelin synthesis. Differentiated Neuro2a cells were analyzed for nimodipine-mediated survival considering stress treatment in comparison to nifedipine-treatment...
May 3, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28466243/contractile-properties-of-periosteal-arterioles-in-the-guinea-pig-tibia
#15
Hiroyasu Fukuta, Retsu Mitsui, Hiromichi Takano, Hikaru Hashitani
The periosteal arterioles of the compact bone may play a critical role in bone growth. To explore the contractile properties of tibial arterioles, spontaneous and nerve-evoked constrictions were compared in preparations from 3-week-old and 1-year-old guinea-pigs. Changes in arteriole diameters were measured using video microscopy. Their innervation was investigated using fluorescence immunohistochemistry. Fifty per cent and 40% of tibial arterioles from 3-week-old and 1-year-old guinea-pigs, respectively, exhibited spontaneous phasic constrictions that were inhibited by 1 μM nifedipine, 10 μM cyclopiazonic acid or 100 μM 2-APB...
May 2, 2017: Pflügers Archiv: European Journal of Physiology
https://www.readbyqxmd.com/read/28453742/blinded-contractility-analysis-in-hipsc-cardiomyocytes-in-engineered-heart-tissue-format-comparison-with-human-atrial-trabeculae
#16
Ingra Mannhardt, Alexandra Eder, Berengere Dumotier, Maksymilian Prondzynski, Elisabeth Krämer, Martin Traebert, Klaus-Dieter Söhren, Frederik Flenner, Konstantina Stathopoulou, Marc D Lemoine, Lucie Carrier, Torsten Christ, Thomas Eschenhagen, Arne Hansen
Objective: Human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CM) may serve as a new assay for drug testing in a human context, but their validity particularly for the evaluation of inotropic drug effects remains unclear. In this blinded analysis, we compared the effects of 10 indicator compounds with known inotropic effects in electrically stimulated (1.5 Hz) hiPSC-CM-derived 3 dimensional engineered heart tissue (EHT) and human atrial trabeculae (hAT). Methods and results: Human EHTs were prepared from iCell® hiPSC-CM, hAT obtained at routine heart surgery...
April 27, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28452086/the-effects-of-nifedipine-and-atosiban-on-perinatal-brain-injury-a-secondary-analysis-of-the-apostel-iii-trial
#17
T A J Nijman, M M Goedhart, C N Naaktgeboren, T R de Haan, D C Vijlbrief, B W Mol, M J N Benders, A Franx, M A Oudijk
OBJECTIVE: Brain injury in prematurely born neonates is strongly associated with poor neurodevelopmental outcome. The aim of our study is to evaluate if nifedipine reduces overall brain injury compared to atosiban in women with threatened preterm birth. METHODS: We performed a secondary analysis of the APOSTEL III-trial (Dutch Clinical Trial Registry, number NTR2947). This was a randomized clinical trial that allocated women with threatened preterm labor between 25-34 weeks of gestation to nifedipine or atosiban...
April 28, 2017: Ultrasound in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28450909/impact-of-gabapentin-on-neuronal-high-voltage-activated-ca-2-channel-properties-of-injured-side-axotomized-and-adjacent-uninjured-dorsal-root-ganglions-in-a-rat-model-of-spinal-nerve-ligation
#18
Minmin Zhu, Xiaodi Sun, Xiaodong Chen, Hang Xiao, Manlin Duan, Jianguo Xu
The density and properties of ion channels in the injured axon and dorsal root ganglion (DRG) neuronal soma membrane change following nerve injury, which may result in the development of neuropathic pain. Gabapentin (GBP) is a drug for the first-line treatment of neuropathic pain. One of its therapeutic targets is the voltage-activated calcium channel (VACC). In the present study, the whole-cell patch clamp technique was used to examine the changes of high voltage-activated Ca(2+) (HVA-Ca(2+)) channels in DRG neurons from sham and neuropathic rats in the absence and presence of GBP...
March 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28446201/anticonvulsant-effects-of-antiaris-toxicaria-aqueous-extract-investigation-using-animal-models-of-temporal-lobe-epilepsy
#19
Priscilla Kolibea Mante, Donatus Wewura Adongo, Eric Woode
BACKGROUND: Antiaris toxicaria has previously shown anticonvulsant activity in acute animal models of epilepsy. The aqueous extract (AAE) was further investigated for activity in kindling with pentylenetetrazole and administration of pilocarpine and kainic acid which mimic temporal lobe epilepsy in various animal species. RESULTS: ICR mice and Sprague-Dawley rats were pre-treated with AAE (200-800 mg kg(-1)) and convulsive episodes induced using pentylenetetrazole, pilocarpine and kainic acid...
April 26, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28441551/treating-normal-early-gestation-placentae-with-preeclamptic-sera-produces-extracellular-micro-and-nano-vesicles-that-activate-endothelial-cells
#20
Xirong Xiao, Fengyi Xiao, Mingzhi Zhao, Mancy Tong, Michelle R Wise, Peter R Stone, Lawrence W Chamley, Qi Chen
OBJECTIVES: Preeclampsia is characterised by systemic endothelial cell dysfunction thought to be triggered by toxic/dangerous factors from the placenta, including placental extracellular vesicles (EVs). Why placental EVs become toxic is unknown. We previously reported that preeclamptic sera produced toxic/dangerous placental macrovesicles but whether small EVs are also toxic/dangerous in preeclampsia is unknown. STUDY DESIGN: First trimester placental explants were treated with 10% preeclamptic or control sera (n=10) for 24h...
April 14, 2017: Journal of Reproductive Immunology
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