scholarly journals The guinea-pig tracheal potential difference as an in vivo model for the study of epithelial sodium channel function in the airways

2008 ◽  
Vol 155 (7) ◽  
pp. 1025-1033 ◽  
Author(s):  
K J Coote ◽  
H Atherton ◽  
A Young ◽  
R Sugar ◽  
R Burrows ◽  
...  
Keyword(s):  
Guinea Pig ◽  
Sodium Channel ◽  
Epithelial Sodium Channel ◽  
Potential Difference ◽  
In Vivo Model ◽  
Channel Function

Camostat Attenuates Airway Epithelial Sodium Channel Function in Vivo through the Inhibition of a Channel-Activating Protease

2009 ◽  
Vol 329 (2) ◽  
pp. 764-774 ◽  
Author(s):  
K. Coote ◽  
H. C. Atherton-Watson ◽  
R. Sugar ◽  
A. Young ◽  
A. MacKenzie-Beevor ◽  
...  
Keyword(s):  
Sodium Channel ◽  
Epithelial Sodium Channel ◽  
Airway Epithelial ◽  
Channel Function

Direct determination of the contractility of the guinea pig gallbladder: a new in vivo model

1985 ◽  
Vol 63 (9) ◽  
pp. 1038-1042 ◽  
Author(s):  
I. S. Pomeranz ◽  
J. S. Davison ◽  
E. A. Shaffer
Keyword(s):  
Guinea Pig ◽  
Nerve Stimulation ◽  
Direct Determination ◽  
Displacement Transducer ◽  
In Vivo Model ◽  
Gallbladder Emptying ◽  
Gallbladder Contraction ◽  
Force Displacement

In vivo methods to study gallbladder contractility either equate gallbladder emptying with contraction or have relied on changes in gallbladder intravesicular pressure to reflect active transmural tension. We therefore devised an animal model in which the contractile force of the intact gallbladder is measured directly while the blood and neural supply remains uncompromised. Under general anesthesia one pole of the guinea pig gallbladder is anchored to the sternum and the other connected to a force displacement transducer. Any contraction–relaxation between these two points is recorded. This model was validated by measuring gallbladder response to both neuronal and humoral stimulation. Nerve stimulation was accomplished by means of two silver collar electrodes placed in contact with the cystic duct. With nerve stimulation, a frequency (0.5–10 Hz) or amplitude (1–10 V) dependent contraction occurred. Intravenous bethanechol (10 × 104 ng∙kg−1∙h−1) and cholecystokinin (3 × 104 ng∙kg−1∙h−1) both induced dose-dependent gallbladder contraction. This model should prove useful in assessing the physiologic control of gallbladder contraction.

scholarly journals Filamin Interacts with Epithelial Sodium Channel and Inhibits Its Channel Function

2012 ◽  
Vol 288 (1) ◽  
pp. 264-273 ◽  
Author(s):  
Qian Wang ◽  
Xiao-Qing Dai ◽  
Qiang Li ◽  
Jagdeep Tuli ◽  
Gengqing Liang ◽  
...  
Keyword(s):  
Sodium Channel ◽  
Epithelial Sodium Channel ◽  
Channel Function

scholarly journals 009 Axonal excitability properties in dravet’s syndrome reflect effect of loss of sodium channels

2019 ◽  
Vol 90 (e7) ◽  
pp. A4.1-A4
Author(s):  
Michelle A Farrar ◽  
Susan E Tomlinson ◽  
James Howells ◽  
Cindy Shin-YI Lin ◽  
Kate Carey ◽  
...  
Keyword(s):  
Sodium Channel ◽  
Single Channel ◽  
Age Groups ◽  
List Type ◽  
Axonal Membrane ◽  
Patients Âgés ◽  
Channel Function ◽  
Axonal Excitability

IntroductionMutations in SCN1A encoding the Nav1.1 subunit of the neuronal sodium channel underlie the devastating epilepsy of Dravet’s syndrome.1 The mechanism by which Nav1.1 dysfunction causes seizures is not clear. In vitro and in silico channel evaluation can support mutation pathogenicity but cannot define the in vivo impact of channel dysfunction. Axonal excitability studies can show the pattern of single-channel dysfunction in disorders where the channel is peripherally expressed.2 This study was undertaken to determine whether axonal excitability studies could detect changes in Dravet’s patients related to the condition or due to medication effect.MethodsPatients with Dravet’s syndrome were recruited from clinics in Sydney and Melbourne and axonal excitability studies were performed. Excitability results were analysed in 3 age groups and compared to age-matched normal controls.ResultsTwenty six patients (ages 2–46) were studied. Findings were most pronounced in patients aged 20–46 (n=7) with 6.9% greater increase in threshold during hyperpolarization(p=0.1), 7.6% greater threshold decrease on depolarization(p=0.005) and, in the recovery cycle, 19.7% reduction in superexcitability(p=0.002) and 26% reduction in subexcitability(p=0.03). Axonal excitability studies resembled previously published changes seen in patients with sodium channel blockade caused by acute tetrodotoxin poisoning.3ConclusionsChanges in excitability of axonal membrane in Dravet’s syndrome are consistent with a decrease in sodium channel function. As the affected channel in Dravet’s syndrome is not peripherally expressed, the effect seen is likely due to the heavy anticonvulsant regime required to control epilepsy, combined with a progressive loss of sodium channel function that occurs with age.ReferencesMeisler MH, O’Brien JE, Sharkey LM. Sodium channel gene family: epilepsy mutations, gene interactions and modifier effects. J Physiol 2010;588:1841–1848.Tomlinson SE, Howells J, Burke D. In vivo assessment of neurological channelopathies: Application of peripheral nerve excitability studies. Neuropharmacology. 2018 Apr;132:98–107.Kiernan MC, Isbister GK, Lin CS, Burke D, Bostock H. Acute tetrodotoxin-induced neurotoxicity after ingestion of puffer fish. Ann Neurol 2005;57:339–48.

A novel in vivo model of anaphylaxis in the guinea pig

1982 ◽  
Vol 4 (4) ◽  
pp. 345 ◽  
Author(s):  
T.J. Rising ◽  
A. Steward ◽  
K.M.K. Bottomley ◽  
S. Lewis
Keyword(s):  
Guinea Pig ◽  
In Vivo Model
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