scholarly journals Effect of Chronic Exposure to Dexamethasone on Rocuronium-induced Neuromuscular Blockade and Sugammadex Reversal: an in Vivo Study on Rats

Author(s):  
Ha Yeon Park ◽  
Heyran Choi ◽  
Yong Beom Kim ◽  
Seok Kyeong Oh ◽  
Taehoon Kim ◽  
...  

Abstract Background: Chronic exposure to glucocorticoids is associated with resistance to nondepolarising neuromuscular blocking agents. Therefore, we hypothesised that sugammadex-induced recovery in subjects with chronic exposure to dexamethasone was faster than that in subjects without dexamethasone exposure. Objective: To evaluate the recovery profile of rocuronium-induced neuromuscular blockade after sugammadex administration in rats. Design: An in vivo study on rats.Setting: Asan Institute for Life Sciences, Asan Medical Center, Korea, from April 2017 to October 2017.Animals: Thirty-six male Sprague-Dawley rats.Intervention: Sprague–Dawley rats were allocated to three groups (dexamethasone group, control group, and pair-fed group) for the in vivo study. Dexamethasone group received daily intraperitoneal injections of dexamethasone 500 μg kg-1 or 0.9% saline for 15 days. On the sixteenth day, 3.5 mg kg-1 of rocuronium was administered to achieve complete neuromuscular blockade. Main outcome measures: The recovery time to a train-of-four ratio Results: There were no significant differences in the recovery time to train-of-four ratio to 0.9 among the groups (P = 0.531). The time to second twitch of train-of-four recovery that indicated the duration of rocuronium-induced neuromuscular blockade was significantly shorter in Group D than in Groups C and P (P = 0.001). Conclusion: As previously reported, resistance to rocuronium was observed in rats with chronic exposure to dexamethasone. However, the neuromuscular recovery time after sugammadex administration was not significantly different between groups.

2007 ◽  
Vol 98 (5) ◽  
pp. 937-943 ◽  
Author(s):  
Claudia Di Giacomo ◽  
Rosaria Acquaviva ◽  
Andrea Piva ◽  
Valeria Sorrenti ◽  
Luca Vanella ◽  
...  

The aim of the present study was to verify whether the oral administration of cyanidin 3-O-β-d-glucoside (C3G) might counteract damage induced by chronic exposure (28 d) to ochratoxin A (OTA) in rats and if its effect may be mediated by haeme oxygenase-1 (HO-1). Forty male Sprague–Dawley rats, individually caged, were divided into four groups of ten animals. A control group received a commercial diet, group C3G received the control diet supplemented with C3G (1 g/kg feed), group OTA received the control diet supplemented with 200 parts per billion of OTA, and group OTA+C3G received the OTA group diet supplemented with C3G (1 g/kg feed). After 4 weeks of treatment animals were killed and the liver, kidneys and brain of each rat were collected and homogenised to evaluate non-proteic thiol groups (RSH), lipid hydroperoxide (LOOH) levels, HO-1 expression and DNA fragmentation. Rats of the OTA group showed a significant (P < 0·001) decrease in RSH content of kidney and liver and a significant (P < 0·001) increase of LOOH in all the examined tissues compared with the control group. In the OTA+C3G group both RSH content and LOOH levels were similar to those observed in the control group, demonstrating that C3G was able to counteract the effects of OTA. A significant (P < 0·001) induction of HO-1 was evident in kidney and liver of both OTA and C3G groups. DNA damage occurred in all the examined tissues of the OTA group, whereas C3G was able to prevent it. The present study confirmed that the effects of OTA are mediated by oxidative stress and demonstrated that C3G efficiently counteracted deleterious effects of OTA because of its antioxidant and HO-1-inducing properties.


2013 ◽  
Vol 2013 ◽  
pp. 1-14 ◽  
Author(s):  
Kwan Yuet Ping ◽  
Ibrahim Darah ◽  
Yeng Chen ◽  
Subramaniam Sreeramanan ◽  
Sreenivasan Sasidharan

DespiteEuphorbia hirtaL. ethnomedicinal benefits, very few studies have described the potential toxicity. The aim of the present study was to evaluate thein vivotoxicity of methanolic extracts ofE. hirta. The acute and subchronic oral toxicity ofE. hirtawas evaluated in Sprague Dawley rats. The extract at a single dose of 5000 mg/kg did not produce treatment related signs of toxicity or mortality in any of the animals tested during the 14-day observation period. Therefore, the LD 50 of this plant was estimated to be more than 5000 mg/kg. In the repeated dose 90-day oral toxicity study, the administration of 50 mg/kg, 250 mg/kg, and 1000 mg/kg/day ofE. hirtaextract per body weight revealed no significant difference (P>0.05) in food and water consumptions, body weight change, haematological and biochemical parameters, relative organ weights, and gross findings compared to the control group. Macropathology and histopathology examinations of all organs including the liver did not reveal morphological alteration. Analyses of these results with the information of signs, behaviour, and health monitoring could lead to the conclusion that the long-term oral administration ofE. hirtaextract for 90 days does not cause sub-chronic toxicity.


Author(s):  
Taylor Mustapich ◽  
John Schwartz ◽  
Pablo Palacios ◽  
Haixiang Liang ◽  
Nicholas Sgaglione ◽  
...  

BackgroundMicrofracture is one of the most widely used techniques for the repair of articular cartilage. However, microfracture often results in filling of the chondral defect with fibrocartilage, which exhibits poor durability and sub-optimal mechanical properties. Stromal cell-derived factor-1 (SDF-1) is a potent chemoattractant for mesenchymal stem cells (MSCs) and is expressed at high levels in bone marrow adjacent to developing cartilage during endochondral bone formation. Integrating SDF-1 into an implantable collagen scaffold may provide a chondro-conductive and chondro-inductive milieu via chemotaxis of MSCs and promotion of chondrogenic differentiation, facilitating more robust hyaline cartilage formation following microfracture.ObjectiveThis work aimed to confirm the chemoattractive properties of SDF-1 in vitro and develop a one-step method for incorporating SDF-1 in vivo to enhance cartilage repair using a rat osteochondral defect model.MethodsBone marrow-derived MSCs (BMSCs) were harvested from the femurs of Sprague–Dawley rats and cultured in low-glucose Dulbecco’s modified Eagle’s medium containing 10% fetal bovine serum, with the medium changed every 3 days. Passage 1 MSCs were analyzed by flow cytometry with an S3 Cell Sorter (Bio-Rad). In vitro cell migration assays were performed on MSCs by labeling cells with carboxyfluorescein diacetate, succinimidyl ester (CFDA-SE; Bio-Rad). For the microfracture model, a 1.6-mm-diameter osteochondral defect was created in the femoral trochleae of 20 Sprague–Dawley rats bilaterally until bone marrow spillage was seen under saline irrigation. One knee was chosen at random to receive implantation of the scaffold, and the contralateral knee was left unfilled as an empty control. Type I collagen scaffolds (Kensey Nash) were coated with either gelatin only or gelatin and SDF-1 using a dip coating process. The rats received implantation of either a gelatin-only scaffold (N = 10) or gelatin-and-SDF-1 scaffold (N = 10) at the site of the microfracture. Femurs were collected for histological analyses at 4- and 8-week time points post-operatively, and sections were stained with Safranin O/Fast Green. The samples were graded blindly by two observers using the Modified O’Driscoll score, a validated scoring system for chondral repair. A minimum of 10 separate grading scores were made per sample and averaged. Quantitative comparisons of cell migration in vitro were performed with one-way ANOVA. Cartilage repair in vivo was also compared among groups with one-way ANOVA, and the results were presented as mean ± standard deviation, with P-values &lt; 0.05 considered as statistically significant.ResultsMSC migration showed a dose–response relationship with SDF-1, with an optimal dosage for chemotaxis between 10 and 100 ng/ml. After scaffold implantation, the SDF-1-treated group demonstrated complete filling of the cartilage defect with mature cartilage tissue, exhibiting strong proteoglycan content, smooth borders, and good incorporation into marginal cartilage. Modified O’Driscoll scores after 8 weeks showed a significant improvement of cartilage repair in the SDF-1 group relative to the empty control group (P &lt; 0.01), with a trend toward improvement when compared with the gelatin-only-scaffold group (P &lt; 0.1). No significant differences in scores were found between the empty defect group and gelatin-only group.ConclusionIn this study, we demonstrated a simple method for improving the quality of cartilage defect repair in a rat model of microfracture. We confirmed the chemotactic properties of SDF-1 on rat MSCs and found an optimized dosage range for chemotaxis between 10 and 100 ng/ml. Furthermore, we demonstrated a strategy to incorporate SDF-1 into gelatin–collagen I scaffolds in vivo at the site of an osteochondral defect. SDF-1-treated defects displayed robust hyaline cartilage resurfacing of the defect with minimal fibrous tissue, in contrast to the empty control group. The results of the in vitro and in vivo studies together suggest that SDF-1-mediated signaling may significantly improve the quality of cartilage regeneration in an osteochondral defect.


1995 ◽  
Vol 269 (6) ◽  
pp. H2017-H2021 ◽  
Author(s):  
S. Verma ◽  
S. Bhanot ◽  
J. H. McNeill

Evidence suggests that hyperinsulinemia may be causally related to the development of high blood pressure (BP) in fructose-hypertensive (FH) rats. Because plasma insulin has been shown to modulate endothelin (ET) release in vivo, we hypothesized that hyperinsulinemia may provide a continual stimulus for ET release, which could increase BP by altering plasma or blood vessel ET levels. To test this hypothesis, we studied the effect of chronic ET-receptor blockade (by using bosentan, a noncompetitive ET antagonist) on plasma insulin levels, plasma ET levels, blood vessel ET content, and BP in FH rats. Chronic oral bosentan treatment (100 mg.kg-1.day-1) was initiated in 6-wk-old Sprague-Dawley rats. One week after bosentan treatment was started, rats were fed either normal rat chow or a fructose-enriched diet. Plasma insulin, plasma glucose, and systolic BP were measured weekly. At termination (in 15-wk-old rats), plasma ET levels and total mesenteric ET content were determined. Bosentan treatment caused a sustained decrease in BP in the FH rats (treated 130 +/- 4 vs. untreated 149 +/- 2 mmHg, P < 0.001) but had no effect in the normotensive control group. FH rats had a higher total mesenteric ET content compared with the control group (21.5 +/- 3.2 vs. 14.1 +/- 2.1 fmol, P < 0.05). Bosentan treatment did not alter total mesenteric ET content (treated 18.8 +/- 5 fmol, P > 0.05 vs. untreated) nor did it affect plasma insulin or ET levels in any group. These data suggest that ET may be involved in the development of high BP in FH rats. Whether ET represents an intermediate, linking hyperinsulinemia to hypertension in rats, or is an independent hypertensinogenic mechanism remains to be determined.


2021 ◽  
Vol 09 ◽  
Author(s):  
Asra Parveen ◽  
Vijay kumar B. Malashetty ◽  
Sushruta Marla ◽  
Shanth Reddy ◽  
Sidramappa Sirsand ◽  
...  

Background: Silver nanoparticles have been widely used in the field of nanomedicine. A comprehensive understanding of their pharmacokinetics is crucial for proper risk assessment and safe biomedical applications. Objectives: The purpose of this study was to investigate the safety of silver nanoparticles by determining its potential toxicity following 28 days administration in Sprague Dawley rats. Method: The silver nanoparticles were administered by intravenous injection at the doses of 100, 200 and 500 µg/kg body weight for 28 consecutive days. Animals in the control group were received sterile water for injection. Each group consists of 10 male and 10 female rats. Results: No treatment related effects were seen in any of the parameters monitored in rats given 100, 200 and 500 µg/kg body weight/day of silver nanoparticles. Conclusion: The study proved that the use of up to 500 µg/kg body weight biosynthesized silver nanoparticles have no toxic effect in the target organs and found safe. However, the safety of the nanoparticles might be attributed to the covering of biological moieties on nanoparticles. Hence, the biofunctionalized nanoparticles can be safely used by selecting the required size and dose in medicines and drug delivery systems.


1995 ◽  
Vol 269 (4) ◽  
pp. F469-F479 ◽  
Author(s):  
C. A. Pfeifer ◽  
F. Suzuki ◽  
E. K. Jackson

This study determines, in vivo, whether endogenous adenosine/A1 receptor interactions at juxtaglomerular cells restrain the release of renin induced by receptor-mediated activation of the adenosine 3',5'–cyclic monophosphate pathway and whether endogenous adenosine/A2 receptor interactions diminish this restraining response. The following four pharmacological probes were employed: 1) 1,3-dipropyl-8-cyclopentylxanthine (DPCPX) and 2) FK-453, both selective A1 receptor antagonists; 3) FR-113452, a nearly inactive enantiomer of FK-453; and 4) KF-17837, a selective A2 receptor blocker. Adult Sprague-Dawley rats were prepared (adrenalectomized, renal denervated, uninephrectomized, and treated with indomethacin, aldosterone, and hydrocortisone) to minimize endogenous stimulation of renin release and received either vehicle (control group) or one of the four drugs. Intrarenal infusions of isoproterenol (3, 30, and 100 ng.kg-1.min-1) caused dose-related increases in plasma renin activity (PRA). This PRA response was significantly augmented in the groups receiving DPCPX (P = 0.0010) or FK-453 (P = 0.0001) but was not altered in the groups treated with FR-113452 (P = 0.3422) or KF-17837 (P = 0.2155). Systemic and renal hemodynamics and renal electrolyte excretions were monitored and could not account for the PRA augmentation caused by the A1 antagonists. This study clearly demonstrates that endogenous adenosine acts on the A1 receptor to restrain the renin release induced by activation of intrarenal beta-adrenoceptors and is not counteracted by endogenous activation of the A2 receptor.


2018 ◽  
Vol 2018 ◽  
pp. 1-14 ◽  
Author(s):  
Liang Yang ◽  
Yuguang Wang ◽  
Guangyao Huang ◽  
Jian Li ◽  
Zhaoyan Zhang ◽  
...  

Objectives. To investigate whether Panax ginseng (P. ginseng) could affect the metabolism of Diester Alkaloids (DAs) derived from Aconiti Lateralis Radix in vivo. Methods and Results. 24 male Sprague-Dawley rats were randomized for 7-day treatment with P. ginseng (low, middle, and high), or vehicle. Aconiti Lateralis Radix was administered orally to each group on the 8th day. Plasma samples were collected, and Xevo TQ-S was used to detect the concentration of aconitine, mesaconitine, and hypaconitine in plasma. We describe a fast and reproducible method to detect the concentration of aconitine, mesaconitine, and hypaconitine in plasma. Compared to the control group, the AUC(0-t) of three DAs increased in both the middle and high dosing groups. The Vz/F of three DAs in these groups as well as the CLz/F of aconitine in all P. ginseng groups and the CLz/F of mesaconitine and hypaconitine in P. ginseng middle and high groups were decreased compared to the control group. Conclusion. Orally administrated P. ginseng potentially inhibits the metabolism of DAs from Aconiti Lateralis Radix in rats.


2021 ◽  
Vol 21 (1) ◽  
Author(s):  
So Ron Choi ◽  
Jeong Ho Kim ◽  
Kyung Hyun Lee ◽  
Sang Yoong Park

Abstract Background Calcium increases the probability of transmitter release at the neuromuscular junction. It is not known whether there is a dose-dependent relationship between the dosage of calcium gluconate and the probability of transmitter release for non-depolarizing neuromuscular blockade (NMB) recovery by acetylcholinesterase inhibitors (AchEIs). This study compared the neuromuscular recovery time and the incidence of postoperative residual curarization (PORC) according to the dosage of calcium gluconate co-administered with neostigmine in three patient groups. Methods Patients were randomly allocated to a control group, a 5 mg/kg calcium gluconate group (calcium 5 group), or a 10 mg/kg calcium gluconate group (calcium 10 group). In patients with a TOF ratio (TOFr) between 0.2–0.7, 0.04 mg/kg of neostigmine was administered and both 0.2 mg of glycopyrrolate and 0.4 mg of atropine per 1 mg of neostigmine were administered. And additional 5 or 10 mg/kg of calcium gluconate were administrated to the calcium 5 and 10 groups. The primary endpoint was neuromuscular recovery time (the time between reversal and TOFr≥0.9). The secondary endpoints were the incidence of PORC at 5, 10, and 20 min after reversal administration and the train-of-four ratio (TOFr) at each time point. Results The neuromuscular recovery time was 5.3 min in the control group, 3.9 min in the calcium 5 group, and 4.1 min in the calcium 10 group, respectively (P = 0.004). The incidence of PORC at 5 min after neostigmine administration was 12 in the control group, 4 in the calcium 5 group, and 4 in the calcium 10 group, respectively, with statistical significance (P = 0.014). Conclusions The co-administration of calcium gluconate with neostigmine safely promoted early NMB recovery, and the neuromuscular recovery time of the calcium 10 group tended to be more evenly distributed than that of the calcium 5 group. Trial registration https://cris.nih.go.kr/cris/index.jsp(KCT0004182). Date of registration: August 122,019.


Author(s):  
Hey-Ran Choi ◽  
Hong-Seuk Yang ◽  
Jae-Moon Choi ◽  
Chungon Park ◽  
Junyong In ◽  
...  

Background: Sugammadex is a specific antagonist of aminosteroidal neuromuscular blocking agents with 1:1 binding to guest molecules. Sugammadex can also bind to other drugs having a steroid component in its chemical structure. In this in vivo experiment, we investigated the differences in the recovery of rocuronium-induced neuromuscular blockade using sugammadex pre-exposed with two different concentrations of hydrocortisone.Methods: The sciatic nerves and tibialis anterior muscles of 30 adult Sprague–Dawley rats were prepared for the experiment. The sciatic nerves were stimulated using a train-of-four (TOF) pattern with indirect supramaximal stimulation at 20 s intervals. After 15 min of stabilization, a 250 μg loading dose and 125 μg booster doses of rocuronium were serially administered until > 95% depression of the first twitch tension of TOF stimulation (T1) was confirmed. The study drugs were prepared by mixing sugamadex with the same volume of three different stock solutions (0.9% normal saline, 10 mg/ml hydrocortisone, and 100 mg/ml hydrocortisone). The recovery of rats from neuromuscular blockade was monitored by assessing T1 and the TOF ratio (TOFR) simultaneously until T1 was recovered to > 95% and TOFR to > 0.9.Results: In the group injected with sugammadex premixed with a high concentration of hydrocortisone, statistically significant intergroup differences were observed in the recovery progression of T1 and TOFR (P < 0.050).Conclusions: When sugammadex was pre-exposed to a high dose of hydrocortisone only, recovery from neuromuscular blockade was delayed. Delayed recovery from neuromuscular blockade is not always plausible when sugammadex is pre-exposed to steroidal drugs.


2020 ◽  
Author(s):  
So Ron Choi ◽  
Sang Yoong Park ◽  
Jeong Ho Kim ◽  
Kyung Hyun Lee

Abstract Background: Calcium increases the probability of transmitter release at the neuromuscular junction. However, it is not known whether there is a dose-dependent relationship between the dosage of calcium gluconate and the probability of transmitter release for non-depolarizing neuromuscular blockade (NMB) recovery by acetylcholinesterase inhibitors (AchEIs). This study compared the neuromuscular recovery time and the incidence of postoperative residual curarization (PORC) according to the dosage of calcium gluconate co-administered with neostigmine in three patient groups.Methods: Patients were randomly allocated to a control group, a 5 mg/kg calcium gluconate group (calcium 5 group), or a 10 mg/kg calcium gluconate group (calcium 10 group). The primary endpoint was neuromuscular recovery time. The secondary endpoints were the incidence of PORC at 5, 10, and 20 minutes after reversal administration and the train-of-four ratio (TOFr) at each time point.Results: The neuromuscular recovery time was 5.3 minutes in the control group, 3.9 minutes in the calcium 5 group, and 4.1 minutes in the calcium 10 group, respectively (P=0.012). Neuromuscular recovery time was significantly different between the control and calcium 10 groups (P=0.017). The incidence of PORC at 5 minutes after neostigmine administration was 12 (46.2%) in the control group, 4 (15.4%) in the calcium 5 group, and 4 (15.4%) in the calcium 10 group, respectively, with statistical significance (P=0.014). Conclusions: The co-administration of 10 mg/kg calcium gluconate with neostigmine achieved early NMB recovery and had the fewest variables.Trial Registration: https://cris.nih.go.kr/cris/index.jsp(KCT0004182). Date of registration:12 august 2019.


Sign in / Sign up

Export Citation Format

Share Document