Bilayer scaffold from PLGA/fibrin electrospun membrane and fibrin hydrogel layer supports wound healing.

Hybrid scaffolds from natural and synthetic polymers have been widely used due to the complementary nature of their physical and biological properties. The aim of the present study, therefore, has been to analyzea bilayer scaffold of poly(lactide-co-glycolide)/fibrin electrospun membrane and fibrin hydrogel layer on a rat skin model. Fibroblasts were cultivated in the fibrin hydrogel layer and keratinocytes on the electrospun membrane to generate a skin substitute.

Effects of intranasal guanosine administration on brain function in a rat model of ischemic stroke.

Ischemic stroke is a major cause of morbidity and mortality worldwide and only few affected patients are able to receive treatment, especially in developing countries. Detailed pathophysiology of brain ischemia has been extensively studied in order to discover new treatments with a broad therapeutic window and that are accessible to patients worldwide. The nucleoside guanosine (Guo) has been shown to have neuroprotective effects in animal models of brain diseases, including ischemic stroke.

Semi-Mechanistic Pharmacokinetic Modeling of Lipid Core Nanocapsules: Understanding Quetiapine Plasma and Brain Disposition in a Neurodevelopmental Animal Model of Schizophrenia.

This study investigated plasma and brain disposition of quetiapine lipid core nanocapsules (QLNC) in naive and schizophrenic (SCZ-like) rats and developed a semimechanistic model to describe changes in both compartments following administration of the drug in solution (FQ) or nanoencapsulated. QLNC (1 mg/ml) presented 166 ± 39 nm, low polydispersity, and high encapsulation (93.0% ± 1.

Quetiapine lipid core nanocapsules restore prepulse inhibition deficits in a neurodevelopmental model of schizophrenia in male and female rats.

Lipid core nanocapsules (LNC) have been extensively studied as a new treatment strategy to improve therapeutic effects of antipsychotic drugs. We investigated the efficacy of quetiapine LNCs (QLNCs) on the poly(i:c) model of schizophrenia in both male and female rats using the pre-pulse inhibition of startle response (PPI) test paradigm after evaluating the outcomes of three different poly(i:c) doses administered to pregnant damns at GD15 on neurodevelopmental outcomes of maternal immune activation (MIA) in adult offspring. QTP solution was not capable of producing a reversal in the sensorimotor gating-disruptive effect caused by the prenatal poly(i:c) exposure.

In vivo genome editing of mucopolysaccharidosis I mice using the CRISPR/Cas9 system.

Mucopolysaccharidosis type I (MPS I) is a multisystemic disorder caused by the deficiency of alpha-L-iduronidase (IDUA) that leads to intracellular accumulation of glycosaminoglycans (GAG). In the present study we aimed to use cationic liposomes carrying the CRISPR/Cas9 plasmid and a donor vector for in vitro and in vivo MPS I gene editing, and compare to treatment with naked plasmids. The liposomal formulation was prepared by microfluidization.

Experimental use of new absorbable tracheal stent.

Background/purpose: Silicone and metallic stents are not effective in children with tracheobronchial stenosis or tracheomalacia. Herein, we aimed to evaluate the clinical manifestations and histological reaction of rabbit trachea to the presence of a new poly(lactic-co-glycolic acid) with polyisoprene (PLGA/PI) polymer absorbable stent.

Methods: Fourteen adult white rabbits (weight, 3.

Lactobacillus rhamnosusGG reduces hepatic fibrosis in a model of chronic liver disease in rats.

Background: The intestinal dysbiosis is common in chronic liver disease and can induce to inflammatory responses and mediate the collagen deposition in the liver.

Aim: To evaluate the probiotic Lactobacillus rhamnosus GG (LGG) for the treatment of liver fibrosis in a model of chronic cholestatic liver disease in rats.

Methods: Male adult Wistar rats (n = 29) were submitted to common bile duct ligation (BDL groups) or manipulation of common bile duct without ligation (Ctrl groups).

IMPROVEMENT IN OXIDATIVE STRESS AFTER DUODENOJEJUNOSTOMY IN AN EXPERIMENTAL MODEL OF TYPE 2 DIABETES MELLITUS.

Background: Type 2 Diabetes Mellitus is a multifactorial syndrome with severe complications. Oxidative stress is accepted as a causal factor of chronic complications.

Aim: To demonstrate alterations in oxidative stress after metabolic surgery.

Cell therapy in the treatment of bronchiolitis obliterans in a murine model.

Objective: To evaluate the importance of stem cells derived from adipose tissue in reducing graft inflammation in a murine model of allogeneic heterotopic tracheal transplant.

Methods: We performed a heterotopic tracheal allografting in dorsal subcutaneous pouch and systemically injected 5x105 mesenchymal stem cells derived from adipose tissue. The animals were divided into two groups according to the time of sacrifice: T7 and T21.

Intravenous vs intraperitoneal mesenchymal stem cells administration: what is the best route for treating experimental colitis?

Aim: To investigate the therapeutic effects of mesenchymal stem cells (MSCs) transplanted intraperitoneally and intravenously in a murine model of colitis.

Methods: MSCs were isolated from C57BL/6 mouse adipose tissue. MSC cultures were analyzed according to morphology, cellular differentiation potential, and surface molecular markers.

Experimental histopathological study on retinal and renal cellular response to intravitreous antiangiogenic drugs.

Aim: To evaluate histopathological retinal and renal response after one single dose of intravitreous injection of antiangiogenic drugs ranibizumab and bevacizumab in rats.

Methods: Experimental study in 60d of life adults Wistar rats. Ten animals were included.

An experimental model of chronic rhinosinusitis in rabbits without bacterial inoculation.

Purpose: Evaluate and compare two different experimental techniques of maxillary sinus ostium occlusion using N-butyl cyanoacrylate in developing chronic histological findings without the inoculation of pathogenic bacteria among rabbits.

Methods: In a randomized study, sixteen New Zealand rabbits were assigned for occlusion of the right maxillary sinus through a transmaxillary approach or through the roof of the nasal cavity. The contralateral sinus served as a control.

Oxidative stress evaluation of ischemia and reperfusion in kidneys under various degrees of hypothermia in rats.

Purpose: To design an animal model of ischemia-reperfusion (I/R) in kidneys and evaluate the role that predetermined ranges of local hypothermia plays on markers of stress-oxydative as well as on histologic sections.

Methods: Twenty eight male rats Wistar, under general anesthesia, undergone right nephrectomy (G0, control group) followed by left kidney ischemia during 40 min. Four temperatures groups were designed, with seven animals randomized for each group: normothermic (G1, ±37ºC), mild hypothermia (G2, 26ºC), moderate hypothermia (G3, 15ºC) and deep hypothermia (G4, 4ºC).

Enzyme replacement therapy started at birth improves outcome in difficult-to-treat organs in mucopolysaccharidosis I mice.

Since we previously observed that in patients with mucopolysaccharidosis (MPS) the storage of undegraded glycosaminoglycans (GAG) occurs from birth, in the present study we aimed to compare normal, untreated MPS I mice (knockout for alpha-l-iduronidase-IDUA), and MPS I mice treated with enzyme replacement therapy (ERT, Laronidase, 1.2mg/kg every 2 weeks) started from birth (ERT-neo) or from 2 months of age (ERT-ad). All mice were sacrificed at 6 months.

Impairment of short term memory in rats with hepatic encephalopathy due to bile duct ligation.

Hepatic encephalopathy (HE) arises from acute or chronic liver diseases and leads to cognitive deficits. Different animal models for the study of HE have demonstrated learning and memory impairment and a number of neurotransmitter systems have been proposed to be involved in this. Recently, it was described that bile duct-ligated (BDL) rats exhibited altered spatio-temporal locomotor and exploratory activities and biosynthesis of neurotransmitter GABA in brain cortices.

Evidence of a progressive motor dysfunction in Mucopolysaccharidosis type I mice.

Mucopolysaccharidosis (MPS) type I (Hurler syndrome) is a lysosomal storage disorder characterized by deficiency of alpha-L-iduronidase (IDUA), intracellular storage of glycosaminoglycans (GAGs) and progressive neurological pathology. The MPS I mouse model provides an opportunity to study the pathophysiology of this disorder and to determine the efficacy of novel therapies. Previous work has demonstrated a series of abnormalities in MPS I mice behavior, but so far some important brain functions have not been addressed.

Intraperitoneal implant of recombinant encapsulated cells overexpressing alpha-L-iduronidase partially corrects visceral pathology in mucopolysaccharidosis type I mice.

Background Aims: Mucopolysaccharidosis type I (MPS I) is characterized by deficiency of the enzyme alpha-L-iduronidase (IDUA) and storage of glycosaminoglycans (GAG) in several tissues. Current available treatments present limitations, thus the search for new therapies. Encapsulation of recombinant cells within polymeric structures combines gene and cell therapy and is a promising approach for treating MPS I.

Histological analysis of cobalt-chromium stents with and without Camouflage® polymer coating: experimental porcine carotid artery model.

This study evaluated the arterial response to cobalt-chromium stents with and without polymer coating (Camouflage®, Hemoteq AG, Wuerselen, Germany) implanted in pigs. Cobalt-chromium balloon-expandable stents (4 × 16 mm) were implanted in the common carotid arteries of nine pigs. Histological analysis of endothelialization, inflammation and injury was performed one month later.

Barrier methods used to prevent pelvic adhesions in videolaparoscopy: experimental study in female rabbits.

Background: This study was designed to evaluate the effectiveness of barrier methods to prevent adhesions in videolaparoscopy, comparing the use of Surgicel(®) and Interceed(®) with the control group.

Methods: We performed a controlled, randomized study in healthy adult female rabbits Oryctolagus cuniculu, inducing adhesions in the abdominal wall by resection of a peritoneal fragment and cauterization. In the control group, surgery was performed, and the other group was randomized to the use of the barrier method.

Anesthetic protocol for videolaparoscopic surgery in rabbits.

Purpose: To describe the anesthetic protocol and the intubation technique without visualizing the trachea in rabbits, in order to enable the videolaparoscopic surgical procedure.

Methods: The experiment was performed on 33 female rabbits (Oryctolagus cuniculus), aged from 5 to 7 months. It consisted of general anesthesia and endotracheal intubation by manual palpation of the trachea of the rabbits, without using the laryngoscope, orally, for later videolaparoscopic surgical access to the abdominal cavity.

Experimental model of the formation of pelvic adhesions by videolaparoscopic in female rabbits.

Purpose: To verify the frequency of postsurgical pelvic adhesion formation in an experimental animal model using videolaparoscopy.

Methods: Experimental study in a sample of 11 non-pregnant female rabbits, aged 5 to 7 months. After general anesthesia, access to the abdominal cavity was performed by an open puncture technique, with 10mm optics, placing two other 5 mm trochars under direct visualization, in the iliac fossae.