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Right now, I'm out on the open road: Gone With The Wynns We're Jason and Nikki Wynn, a couple of perpetual travelers and modern day documentarians. We share in hopes of inspiring you to fi: Welcome to RV-Dreams!! We are so glad to see you! Now with a popular online forum. A dedicated fulltime RVer site! This website is dedicated to the use. Itch definition is - to have an itch. How to use itch in a sentence. Copy and paste the following code to link back to this work (CTRL A/CMD A will select all), or use the Tweet or Tumblr links to share the work on your Twitter or Tumblr account. Out Of Reach: an FPS where shooting a teleport projectile is your only form of movement. 9 levels for you to speedrun. Itch.io View all. 8.7k views 593 subscribers 850 likes GL Drama LGBTQ+. Comic 8.7k views 593 subscribers 850 likes Subscribe. Episodes Details. Description on hiatus due to tech issues highschool is weird, and it takes time figuring out yourself. Isobel is willing to support her childhood.
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[ on hiatus due to tech issues ]
highschool is weird, and it takes time figuring out yourself. isobel is willing to support her childhood friend adeline through anything, but what about her own feelings..?
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[ on hiatus due to tech issues ]
highschool is weird, and it takes time figuring out yourself. isobel is willing to support her childhood friend adeline through anything, but what about her own feelings..?
Animal study reveals a skin itch receptor contributes to airway constriction
Working with mice, Johns Hopkins researchers report they have found previously known skin itch receptors in the airways that appear to contribute to bronchoconstriction and airway hypersensitivity, hallmarks of asthma and other respiratory disorders. The investigators' experiments in mice suggest that the receptors' activation directly aggravates airway constriction and—if the same process is active in people—may be a promising new target for the development of drug therapies.
In a report on the study, published Feb. 5 in Nature Neuroscience, researchers say the biochemical receptor, known as a G protein-coupled receptor, was present on nerve cells in the lower respiratory tracts of lab mice.
'The findings give us a fuller picture of what airway reactivity looks like,' says Xinzhong Dong, Ph.D., professor of neuroscience at the Johns Hopkins University School of Medicine Institute for Basic Biomedical Sciences.
In a report on the study, published Feb. 5 in Nature Neuroscience, researchers say the biochemical receptor, known as a G protein-coupled receptor, was present on nerve cells in the lower respiratory tracts of lab mice.
'The findings give us a fuller picture of what airway reactivity looks like,' says Xinzhong Dong, Ph.D., professor of neuroscience at the Johns Hopkins University School of Medicine Institute for Basic Biomedical Sciences.
Dong said he and his team were inspired to study 'itchiness' in the airway by asthma patients who reported the sensation in their lungs just prior to full-blown asthma symptoms such as wheezing. Though he has been studying the G protein-coupled receptor on the skin for many years, Dong said he had not yet looked for it in other parts of the body.
Using fluorescent antibodies designed specifically to light up the receptor in mice, the investigators observed it on vagus nerves, which serve as a main biochemical connection between airway cells and the brain.
To explore the effects of the receptor on the airway, the researchers used a protein called BAM8-22, which is an itch activator that specifically targets the G protein-coupled receptor, to induce a reaction. They found that mice with the G protein-coupled receptor breathed more quickly and with more effort after exposure to the receptor activator than mice lacking it, evidence that the receptors are activated before an asthma-like attack.
Currently, asthma treatments such as anticholinergics target the hypersensitive nerves that connect the brain to so-called parasympathetic neurons in the smooth muscle of the airway.
To investigate what, if any, role vagus neurons have in this system, Dong and his team repeated the experiments, while also activating the airway smooth muscles using acetylcholine—a neurotransmitter used throughout the nervous system to activate muscles. They found that stimulation of the G protein-coupled receptor increased airway constriction more than activating the airway smooth muscles alone.
The research team then infected specially bred mice carrying G protein-coupled receptors and those without the receptor with an influenza virus—which is known to trigger asthma attacks in humans. When the researchers then administered acetylcholine to the mice through the nebulizer, they observed that mice with the G protein-coupled receptors reacted more vigorously than those with only smooth muscle reactions, and they also showed increased airway restriction compared to their counterparts without the receptor.
'We know that influenza stresses the respiratory system in humans. Through this test, we saw that in mice, activating our receptor made the reaction much, much worse,' says Dong.
In the future, Dong hopes to identify a compound that can block the G protein-coupled receptor on vagus nerves as a means of stopping airway 'itch' and curbing asthma.
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Other researchers involved in this study include Liang Han, Nathachit Limjunyawong, Zhe Li, Fei Ru, Marian Kollarik, Bradley J Undem and Brendan J Canning of the Johns Hopkins University School of Medicine; Olivia J Hall and Wayne Mitzner of the Johns Hopkins Bloomberg School of Public Health; and Haley Steele, Yuyan Zhu and Julie Wilson of the Georgia Institute of Technology.
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This research was supported by the National Institutes of Health (NS054791 & NS087088), the National Heart, Lung, and Blood Institute (112919 &122228) and by the American Asthma Foundation.
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