scholarly journals Chemokine, cytokine and haematological profiles in Sprague-Dawley rats co-infected with Plasmodium berghei ANKA and Trichinella zimbabwensis-A laboratory animal model for malaria and tissue-dwelling nematodes co-infection

Heliyon ◽  
2020 ◽  
Vol 6 (2) ◽  
pp. e03475 ◽  
Author(s):  
Pretty Murambiwa ◽  
Ekuyikeno Silas ◽  
Yanga Mdleleni ◽  
Samson Mukaratirwa
Keyword(s):  
Animal Model ◽  
Plasmodium Berghei ◽  
Laboratory Animal ◽  
Plasmodium Berghei Anka ◽  
Sprague Dawley ◽  
Sprague Dawley Rats

Ultrastructural investigation of spontaneous pituitary gonadotroph cell adenomas in aging Sprague-Dawley rats

1983 ◽  
Vol 41 ◽  
pp. 702-703
Author(s):  
D. J. McComb ◽  
J. Beri ◽  
F. Zak ◽  
K. Kovacs
Keyword(s):  
Electron Microscopy ◽  
Animal Model ◽  
Epoxy Resin ◽  
Immunoelectron Microscopy ◽  
Tumor Type ◽  
Gonadal Function ◽  
Sprague Dawley ◽  
Male And Female ◽  
Reticulin Fibers ◽  
Sprague Dawley Rats

Gonadotroph cell adenomas of the pituitary are infrequent in human patients and are not invariably associated with altered gonadal function. To date, no animal model of this tumor type exists. Herein, we describe spontaneous gonadotroph cell adenomas in old male and female Sprague-Dawley rats by histology, immunocytology and electron microscopy.The material consisted of the pituitaries of 27 male and 38 female Sprague Dawley rats, all 26 months of age or older, removed at routine autopsy. Sections of formal in-fixed, paraffin-embedded tissue were stained with hematoxylin-phloxine-saffron (HPS), the PAS method and the Gordon-Sweet technique for the demonstration of reticulin fibers. For immunostaining, sections were exposed to anti-rat β-LH, anti-ratβ-TSH, anti-rat PRL, anti-rat GH and anti-rat ACTH 1-39. For electron microscopy, tissue was fixed in 2.5% glutaraldehyde, postfixed in 1% OsO4 and embedded in epoxy-resin. Tissue fixed in 10% formalin, embedded in epoxy resin without osmification, was used for immunoelectron microscopy.

Recombinant human regenerating gene 4 attenuates the severity of osteoarthritis by promoting the proliferation of articular chondrocyte in an animal model

2021 ◽  
Vol 14 ◽  
Author(s):  
Xue-jia Li ◽  
Fei Zhu ◽  
Bo Li ◽  
Dong Zhang ◽  
Cheng-Wei Liang
Keyword(s):  
Risk Factors ◽  
Animal Model ◽  
Sprague Dawley ◽  
Articular Chondrocyte ◽  
Chondrocyte Proliferation ◽  
Histological Changes ◽  
Proper Role ◽  
Sprague Dawley Rats ◽  
Gene 4

Introduction: Osteoarthritis (OA) is a dominant cause of morbidity and disability. As a chronic disease, its etiological risk factors and most therapies at present, are empirical and symptomatic. Regenerating gene 4 (Reg4) is involved in cell growth, survival, regeneration, adhesion, and resistance to apoptosis, which are partially thought to be the pathogenic mechanisms of OA. However, the proper role of Reg4 in OA is still unknown. Methods: In this study, a consecutive administration of rhReg4 was applied to normal Sprague-Dawley rats or rats after OA induction. Histological changes and chondrocyte proliferation in the articular cartilage were measured. Results: We found that RhReg4 promotes chondrocyte proliferation in normal rats, and RhReg4 attenuated the severity of OA in rats by promoting chondrocytes’ proliferation in OA rats. Conclusion: In conclusion, recombinant human regenerating gene 4 (rhReg4) attenuates the severity of osteoarthritis in OA animal models and may be used as a new method for the treatment of osteoarthritis.

scholarly journals Usefulness of a finger-mounted tissue oximeter with near-infrared spectroscopy for evaluating the intestinal oxygenation and viability in rats

Surgery Today ◽  
2020 ◽  
Author(s):  
Yuhi Suzuki ◽  
Masayoshi Yamamoto ◽  
Kosuke Sugiyama ◽  
Toshiya Akai ◽  
Katsunori Suzuki ◽  
...  
Keyword(s):  
Animal Model ◽  
Intestinal Ischemia ◽  
Near Infrared ◽  
Tissue Oxygenation ◽  
Promising Result ◽  
Sprague Dawley ◽  
Sprague Dawley Rats ◽  
Histological Score ◽  
Ischemic Tissue ◽  
Normal Intestine

Abstract Purpose To investigate the utility of the device for evaluating intestinal oxygenation and viability using an animal model. Methods Sprague–Dawley rats underwent laparotomy under general anesthesia, and the blood vessels in the terminal ileum were clamped to create ischemia. We measured the regional tissue oxygenation saturation (rSO2) using an oximeter after 1, 3, and 6 h of vessel clamping. Ischemic tissue damage was assessed using a histological score. The intestine was reperfused after each clamping period, and intestinal rSO2 and survival rate were evaluated. Results When reperfusion was performed at 1 and 3 h after ischemia, rSO2 increased after 10 min, and it improved to the same level as for normal intestine after 1 h; all rats survived for 1 week. In contrast, after 6 h of ischemia, rSO2 did not increase after reperfusion, and all animals died within 2 days. The histological scores increased after 1 h of reperfusion, with longer clamping periods. Conclusion A finger-mounted tissue oximeter could evaluate intestinal ischemia and the viability, which is thus considered to be a promising result for future clinical application.

scholarly journals Cardiotoxic effects of pavetamine extracted from Pavetta harborii in the rat

2008 ◽  
Vol 75 (3) ◽  
Author(s):  
L. Hay ◽  
R.A. Schultz ◽  
P.J. Schutte
Keyword(s):  
Heart Failure ◽  
Animal Model ◽  
Carotid Artery ◽  
Plant Material ◽  
Active Component ◽  
Systolic Function ◽  
Sprague Dawley ◽  
Sprague Dawley Rats ◽  
The Right ◽  
Induce Heart Failure

Previous studies have shown that crude extracts from Pavetta harborii as well as dried plant material have cardiotoxic effects on rats and sheep that can lead to heart failure. The active component has since been isolated and identified. This substance has been named pavetamine. The aim of this study was to determine whether pavetamine has cardiotoxic effects similar to those seen in previous reports, when administered to rats intraperitoneally. Sprague Dawley rats received two doses, initially 4 mg / kg and then 3 mg / kg pavetamine respectively and were monitored for 35 days before cardiodynamic parameters were measured by inserting a fluid-filled catheter into the left ventricle via the right carotid artery. These values were compared to those of control rats that had received only saline. Pavetamine significantly reduced systolic function and body mass in the treated rats, which indicates that it has the potential to induce heart failure in this animal model.

A Novel Rat Model for Comprehensive Microvascular Training of End-to-End, End-to-Side, and Side-to-Side Anastomoses

2019 ◽  
Vol 35 (07) ◽  
pp. 499-504 ◽  
Author(s):  
Xiaoliang Yin ◽  
Gengfan Ye ◽  
Jun Lu ◽  
Lijun Wang ◽  
Peng Qi ◽  
...  
Keyword(s):  
Animal Model ◽  
Average Length ◽  
Proximal Part ◽  
Distal Portion ◽  
Left Renal Artery ◽  
Sprague Dawley ◽  
Anatomical Dissection ◽  
Sprague Dawley Rats ◽  
End To End ◽  
The Right

Background End-to-end, end-to-side, and side-to-side microvascular anastomoses are the main types of vascular bypass grafting used in microsurgery and neurosurgery. Currently, there has been no animal model available for practicing all three anastomoses in one operation. The aim of this study was to develop a novel animal model that utilizes the rat abdominal aorta (AA), common iliac arteries (CIAs), and the median sacral artery (MSA) for practicing these three types of anastomosis. Methods Eight adult Sprague–Dawley rats were anesthetized and then laparotomized. The AA, MSA, and bilateral CIAs were exposed and separated from the surrounding tissues. The length and diameter of each artery were measured. The relatively long segment of the AA without major branches was selected to perform end-to-end anastomosis. One side of the CIAs (or AA) and MSA were used for end-to-side anastomosis. The bilateral CIAs were applied to a side-to-side and another end-to-side anastomosis. Results Anatomical dissection of the AA, CIAs, and MSA was successfully performed on eight Sprague–Dawley rats; four arterial-to-arterial anastomoses were possible for each animal. The AA trunk between the left renal artery and right iliolumbar arteries was 15.60 ± 0.76 mm in length, 1.59 ± 0.15 mm in diameter, for an end-to-end anastomosis. The left CIA was 1.06 ± 0.08 mm in diameter, for an end-to-side anastomosis with the right CIA. The MSA was 0.78 ± 0.07 mm in diameter, for another end-to-side anastomosis with the right CIA or AA. After finishing end-to-side anastomosis in the proximal part of bilateral CIAs, the distal portion was juxtaposed for an average length of 5.6 ± 0.25 mm, for a side-to-side anastomosis. Conclusion This model can comprehensively and effectively simulate anastomosis used in revascularization procedures and can provide more opportunities for surgical education, which may lead to more routine use in microvascular anastomosis training.

scholarly journals Differential Effect of the Dopamine D3 Agonist (±)-7-Hydroxy-2-(N,N-di-n-propylamino) Tetralin (7-OH-DPAT) on Motor Activity between Adult Wistar and Sprague-Dawley Rats after a Neonatal Ventral Hippocampus Lesion

2011 ◽  
Vol 2011 ◽  
pp. 1-8
Author(s):  
Sonia Guzmán-Velázquez ◽  
Linda Garcés-Ramírez ◽  
Gonzalo Flores ◽  
Fidel De La Cruz ◽  
Sergio R. Zamudio
Keyword(s):  
Animal Model ◽  
Motor Activity ◽  
Differential Effect ◽  
Sprague Dawley ◽  
Behavioral Alterations ◽  
Male Adult ◽  
Sd Rats ◽  
Sprague Dawley Rats ◽  
Dopamine D3 ◽  
Genetic And Environmental Factors

The neonatal ventral hippocampal lesion (nVHL) has been widely used as an animal model for schizophrenia. Rats with an nVHL show several delayed behavioral alterations that mimic some symptoms of schizophrenia. Sprague-Dawley (SD) rats with an nVHL have a decrease in D3 receptors in limbic areas, but the expression of D3 receptors in Wistar (W) rats with an nVHL is unknown. The 7-Hydroxy-2-(N,N-di-n-propylamino) tetralin (7-OH-DPAT) has been reported as a D3-preferring agonist. Thus, we investigated the effect of (±)-7-OH-DPAT (0.25 mg/kg) on the motor activity in male adult W and SD rats after an nVHL. The 7-OH-DPAT caused a decrease in locomotion of W rats with an nVHL, but it did not change the locomotion of SD rats with this lesion. Our results suggest that the differential effect of 7-OH-DPAT between W and SD rats with an nVHL could be caused by a different expression of the D3 receptors. These results may have implications for modeling interactions of genetic and environmental factors involved in schizophrenia.

scholarly journals Lack of protective effect of autotransplanted splenic tissue to pneumococcal challenge

Blood ◽  
1978 ◽  
Vol 51 (3) ◽  
pp. 475-478
Author(s):  
AD Schwartz ◽  
JF Goldthorn ◽  
JA Winkelstein ◽  
AJ Swift
Keyword(s):  
Animal Model ◽  
Splenic Tissue ◽  
Immune Functions ◽  
Sprague Dawley ◽  
Experimental Animals ◽  
Susceptibility To Infection ◽  
Normal Spleen ◽  
Sprague Dawley Rats ◽  
Encapsulated Bacteria ◽  
Increased Susceptibility

Studies in animals and clinical experience in patients have demonstrated that splenectomy may lead to an increased susceptibility to infection. The infections are usually caused by encapsulated bacteria such as penumococcus. It has been shown in a variety of experimental animals that autotransplanted splenic tissue is capable of regenerating into implants that are microscopically indistinguishable from normal spleen and of restoring a number of normal splenic functions. The response to intravenous challenge with Streptococcus pneumoniae, type 25, was therefore studied in control, asplenic, and autotransplanted Sprague-Dawley rats. Despite previous observations that a number of immune functions can be restored in this animal model by autotransplanted splenic tissue, the present study indicates that splenic tissue autotransplants do not restore the ability to resist intravenous pneumococcal challenge.

scholarly journals Percutaneous Application of Galvanic Current in Rodents Reverses Signs of Myofascial Trigger Points

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
R. Margalef ◽  
M. Bosque ◽  
P. Monclús ◽  
P. Flores ◽  
F. Minaya-Muñoz ◽  
...  
Keyword(s):  
Animal Model ◽  
Electric Fields ◽  
Electrical Current ◽  
Trigger Points ◽  
Sprague Dawley ◽  
Galvanic Current ◽  
Myofascial Trigger Points ◽  
Sprague Dawley Rats ◽  
Release Of Acetylcholine ◽  
Miniature Endplate Potentials

An increase in the spontaneous release of acetylcholine (ACh) at the motor endplate is directly related to the generation of myofascial trigger points (MTrPs). In this study, percutaneous electric fields were applied to an animal model of MTrPs with high levels of spontaneous ACh release. All experiments were performed on Swiss mice and Sprague Dawley rats. For evaluating the spontaneous neurotransmission, intracellular recordings were performed, and the frequency of miniature endplate potentials was evaluated. Electromyographic recordings were also conducted to evaluate the endplate noise. Finally, the number and strength of local twitch responses (LTR) were evaluated using ultrasound recordings. The protocols used for the electric currents were 0.4 mA for five seconds and four repetitions (protocol 1), 1.5 mA for five seconds and three repetitions (protocol 2), and 3 mA for three seconds and three repetitions (protocol 3). After a subcutaneous injection of neostigmine (NTG), a great increase was observed in the frequency of mEPPs, together with an elevated endplate noise. Protocols 2 and 3 were the most effective. Protocol 3 could completely reverse the action of NTG at both three hours and 24 hours, respectively. The application of percutaneous currents produced both an increase in the number (144%) and in the speed (230% faster) of LTR compared with dry needling. In conclusion, higher doses of electrical current are more effective for decreasing MTrPs findings in an animal model.

scholarly journals A Rat Model of Epilepsy in Women: A Tool to Study Physiological Interactions Between Endocrine Systems and Seizures

2009 ◽  
Vol 94 (7) ◽  
pp. 2671-2671
Author(s):  
Helen E. Scharfman ◽  
Gauri H. Malthankar-Phatak ◽  
Daniel Friedman ◽  
Patrice Pearce ◽  
Daniel P. McCloskey ◽  
...  
Keyword(s):  
Animal Model ◽  
Hormone Secretion ◽  
Sprague Dawley ◽  
Receptor Modulator ◽  
Spontaneous Seizures ◽  
Sprague Dawley Rats ◽  
Endocrine Status ◽  
Estrous Cyclicity ◽  
Acute Convulsions ◽  
Epilepsy In Women

Epilepsy in women is influenced by endocrine status and antiepileptic drugs (AEDs), but without an animal model, the effects of endocrine variables and AEDs cannot be easily dissociated from the influence of epilepsy itself. Animal models have had limited utility because experimentally-induced seizures typically result in reproductive failure. This study was conducted to develop an improved animal model. The muscarinic convulsant pilocarpine was used to elicit status epilepticus (SE) in adult female Sprague-Dawley rats. The selective estrogen receptor modulator raloxifene was administered 30 min before pilocarpine. An anticonvulsant barbiturate, pentobarbital, was injected 5–10 min after the onset of SE, and at least once thereafter to minimize acute convulsions. Mortality, morbidity, estrous cyclicity, and the ultimate success of the procedure (i.e. induction of recurrent, spontaneous seizures) were monitored. The combination of raloxifene and pentobarbital led to significantly improved estrous cyclicity compared to previous methods. Animals treated with raloxifene and pentobarbital became epileptic, as defined by the recurrence of spontaneous convulsions in the weeks after SE. The results of this study provide an improved animal model to examine the interactions between seizures and ovarian hormone secretion. The results also suggest that treatment of SE with raloxifene may benefit women with SE.

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