Abstract:
:Excitatory and inhibitory junction potentials of circular smooth muscle cells in guinea pig ileum and colon are suppressed 30-90 min after setting up in vitro preparations. We have previously shown this "unresponsive" period is associated with a transient loss of dye coupling between smooth muscle cells, which subsequently recovers over the ensuing 30-90 min; junction potentials recover in parallel with dye coupling (Carbone et al., 2012). Here, we investigated which components of dissection trigger the initial loss of coupling. Intracellular recordings were made from circular muscle cells of guinea pig ileum with micropipettes containing 5% carboxyfluorescein. After allowing 90-120 min for junction potentials to reach full amplitude, we re-cut all 4 edges of the preparation more than 1 mm from the recording sites. This caused a reduction in the amplitude of IJPs from 17.2 ± 0.7 mV to 9.5 ± 1.5 mV (P < 0.001, n = 12) and a significant reduction in dye coupling. Both recovered within 60 min. We repeated this experiment (n = 4), recording both 1 and 4 mm from the cut edge: both sites were equally affected by re-cutting the sides of the preparation. Equilibrated preparations were stretched to 150% of their original length, this had no significant effect on junction potentials or dye coupling. Setting up preparations in low calcium solution did not prevent the initial suppression of IJPs and dye coupling. Application of 3 μM indomethacin (n = 3), 10 μM ketotifen (n = 4) or 10 μM forskolin during dissection did not prevent the suppression of IJPs and dye coupling. If dissection damage was reduced, by leaving the mucosa and submucosa attached to the circular muscle, IJPs showed less initial suppression than in preparations where the layers were dissected off. We conclude that physical damage to the gut wall triggers loss of gap junction coupling and neuromuscular transmission, this is not due to stretch, influx of calcium ions, release of prostaglandins or mast cell degranulation. The mechanisms underlying this potent effect remain to be determined.
journal_name
Front Physioljournal_title
Frontiers in physiologyauthors
Carbone SE,Wattchow DA,Spencer NJ,Hibberd TJ,Brookes SJdoi
10.3389/fphys.2014.00319subject
Has Abstractpub_date
2014-08-22 00:00:00pages
319issn
1664-042Xjournal_volume
5pub_type
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journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2019.01210
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journal_title:Frontiers in physiology
pub_type: 杂志文章,评审
doi:10.3389/fphys.2020.00419
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journal_title:Frontiers in physiology
pub_type: 杂志文章
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journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2017.00140
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abstract::Introduction: Baroreflex sensitivity (BRS) is essential to ensure rapid adjustment to variations in blood pressure (BP). Little is known concerning the adaptive responses of BRS during acclimatization to high altitude at rest and during exercise. Methods: Twenty-one healthy sea-level residents were tested near sea lev...
journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2018.00767
更新日期:2018-06-21 00:00:00
abstract::Systems biology approaches provide means to study the interplay between biological processes leading to the mechanistic understanding of the properties of complex biological systems. Here, we developed a vector format rule-based Boolean logic model of the yeast S. cerevisiae cAMP-PKA, Snf1, and the Snf3-Rgt2 pathway t...
journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2018.01964
更新日期:2019-01-21 00:00:00
abstract::Background: This study investigated the effect of volume-matched strength training programs with different frequency and subsequent detraining on muscle size and strength. Methods: During a training period of 11 weeks, untrained subjects (age: 22.3 ± 0.9 years, height: 173.1 ± 4.8 cm and body mass: 66.8 ± 8.4 kg) perf...
journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2018.00744
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journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2019.01573
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journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2017.00972
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journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2017.00576
更新日期:2017-08-08 00:00:00
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journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2017.00150
更新日期:2017-03-23 00:00:00
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journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2014.00327
更新日期:2014-08-26 00:00:00
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journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2020.569221
更新日期:2020-10-15 00:00:00
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journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2020.577400
更新日期:2020-10-20 00:00:00
abstract::Glucagon-like peptide 1 (GLP-1) in addition to regulating glucose-dependent insulin and glucagon secretion exerts anorexic and neuroprotective effects. While brain-derived GLP-1 may participate in these central actions, evidence suggests that peripherally derived GLP-1 plays an important role and GLP-1 analogs are kno...
journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2020.00555
更新日期:2020-05-29 00:00:00
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journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2012.00333
更新日期:2012-08-24 00:00:00
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journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2019.01201
更新日期:2019-09-18 00:00:00
abstract::Background: In an aging population, regular physical activity (PA) and exercise have been recognized as important factors in maintaining physical function and thereby preventing loss of independence and disability. However, (older) adults spent the majority of their day sedentary and therefore insight into the consequ...
journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2017.00242
更新日期:2017-04-25 00:00:00
abstract::As part of the ZOOMICS project, we set out to investigate common and diverging metabolic traits in the blood metabolome across various species by taking advantage of recent developments in high-throughput metabolomics. Here we provide the first comparative metabolomics analysis of fresh and stored human (n = 21, 10 ma...
journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2020.593841
更新日期:2020-10-23 00:00:00
abstract::During formation of the secondary palate in mammalian embryos, two vertically oriented palatal shelves rapidly elevate into a horizontal position above the tongue, meet at the midline, and fuse to form a single entity. Previous observations suggested that elevation occurs by a simple 90° rotation of the palatal shelve...
journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2016.00392
更新日期:2016-09-07 00:00:00
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journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2012.00191
更新日期:2012-06-11 00:00:00
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journal_title:Frontiers in physiology
pub_type: 杂志文章,评审
doi:10.3389/fphys.2020.00135
更新日期:2020-02-21 00:00:00
abstract::During embryonic development, multipotent endodermal cells differentiate to form the pancreas. Islet cell clusters arising from the pancreatic bud form the acini tissue and exocrine ducts whilst pancreatic islets form around the edges of the clusters. The successive steps of islet differentiation are controlled by a c...
journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2013.00170
更新日期:2013-07-18 00:00:00
abstract::Myalgic Encephalomyelitis/Chronic Fatigue Syndrome (ME/CFS) is a debilitating multi-systemic chronic illness of unknown etiology, classified as a neurological disorder by the World Health Organization (WHO). The symptomatology of the condition appears to emanate from a variety of sources of chronic neurological distur...
journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2017.00088
更新日期:2017-02-17 00:00:00
abstract::Pulmonary edema (PE) is an issue widely noted in acute exposure to hypoxia as seen in high altitude climbers, yet the etiology of this is not defined. Previous studies in rats showed that both hypoxia and strong sympathetic activation may induce PE. As acute exposure to hypoxia is accompanied by sympathetic activation...
journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2019.00860
更新日期:2019-07-05 00:00:00
abstract::Invasive coronary revascularization has been shown to improve prognoses in patients with non-ST-segment elevation acute coronary syndromes (NSTE-ACS), but the optimal timing of intervention remains unclear. This meta-analysis is to evaluate the outcomes in immediate (<2 h), early (<24 h), and delayed invasive group an...
journal_title:Frontiers in physiology
pub_type: 杂志文章,评审
doi:10.3389/fphys.2017.00952
更新日期:2017-11-27 00:00:00
abstract::Many natural phenomena display "self-organized criticality" (SOC), (Bak et al., 1987). This refers to spatially extended systems for which patterns of activity characterized by different lengthscales can occur with a probability density that follows a power law with pattern size. Differently from power laws at phase t...
journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2012.00350
更新日期:2012-09-03 00:00:00
abstract::The purpose of this study was to compare the effects of two similar high-intensity intermittent exercises (HIIE) but different volume 1.25 km (HIIE1.25) and 2.5 km (HIIE2.5) on inflammatory and BDNF responses. Ten physically active male subjects (age 25.22 ± 1.74 years, body mass 78.98 ± 7.31 kg, height 1.78 ± 0.06 m,...
journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2016.00509
更新日期:2016-11-04 00:00:00
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journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2018.01073
更新日期:2018-08-07 00:00:00
abstract::The integrated pest management (IPM) strategy was developed and used in combination with pesticides and beneficial biological control agents. To further develop IPM efficiency, it is important to evaluate the side effects of pesticides on biological control agents. Aphidius gifuensis is one of the most important aphid...
journal_title:Frontiers in physiology
pub_type: 杂志文章
doi:10.3389/fphys.2018.01729
更新日期:2018-12-11 00:00:00