Intratracheal instillation: Difference between revisions
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'''Intratracheal instillation''' is the introduction of a substance directly into the [[trachea]]. It is widely used to test the [[Inhalation exposure|respiratory toxicity]] of a substance |
'''Intratracheal instillation''' is the introduction of a substance directly into the [[trachea]]. It is widely used to test the [[Inhalation exposure|respiratory toxicity]] of a substance as an alternative to [[inhalation]] in [[animal testing]]. Intratracheal instillation was reported as early as 1923 in studies of the [[Carcinogen|carcinogenicity]] of [[coal tar]]. Modern methodology was developed by several research groups in the 1970s.<ref name=":0" /> |
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As compared to inhalation, intratracheal instillation allows greater control over the dose and location of the substance, is cheaper and less technically demanding, allows lower amounts of scarce or expensive substances to be used, allows substances to be tested that can be inhaled by humans but not small mammals, and minimizes exposure to laboratory workers and to the skin of laboratory animals. Disadvantages include its nonphysiological and invasive nature, the [[confounding]] effects of the delivery vehicle and anesthesia, and the fact that it bypasses the [[upper respiratory tract]]. Instillation results in a less uniform distribution of the substance than inhalation, and the substance is cleared from the respiratory tract more slowly.<ref name=":0">{{Cite journal|last=Driscoll|first=Kevin E. |
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|first2=Daniel L. |last2=Costa |
|first2=Daniel L. |last2=Costa |
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|first3=Gary |last3=Hatch |
|first3=Gary |last3=Hatch |
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== Methodology == |
== Methodology == |
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Intratracheal instillation is often performed with mice, rats, or hamsters, with hamsters often preferred because their mouth can be opened widely to aid viewing the procedure,<ref>{{Cite book|url=https://books.google.com/books?id=uxvqDAAAQBAJ&pg=PA187|title=Toxicology of Nanomaterials|last=Zhao|first=Yuliang|date=2016-12-12|publisher=John Wiley & Sons|year=|isbn=9783527337972|location=|pages=163|language=en|quote=|via=}}</ref> |
Intratracheal instillation is often performed with mice, rats, or hamsters, with hamsters often preferred because their mouth can be opened widely to aid viewing the procedure,<ref>{{Cite book|url=https://books.google.com/books?id=uxvqDAAAQBAJ&pg=PA187|title=Toxicology of Nanomaterials|last=Zhao|first=Yuliang|date=2016-12-12|publisher=John Wiley & Sons|year=|isbn=9783527337972|location=|pages=163|language=en|quote=|via=}}</ref> and because they are more resistant to lung diseases than rats.<ref>{{Cite book|url=https://books.google.com/books?id=KhvqCAAAQBAJ&pg=PA63|title=Free Radicals and Inhalation Pathology|last=Schiller|first=Erich|date=2013-06-29|publisher=Springer Science & Business Media|year=|isbn=9783642186196|location=|pages=63|language=en|quote=|via=}}</ref> Instillation is performed either through inserting a needle or [[catheter]] down the mouth and throat, or through surgically exposing the trachea and penetrating it with a needle. Generally, short-acting inhaled [[anesthetic]] drugs such as [[halothane]], [[metaphane]], or [[enflurane]] are used during the instillation procedure. [[Saline (medicine)|Saline solution]] is usually used as a delivery vehicle in a typical volume of 1–2 mL/kg body weight.<ref name=":0" /> A wide range of substances can be tested, including both soluble materials and insoluble particles or fibers, including [[nanomaterials]].<ref name=":0" /><ref name=":1" /><ref>{{Cite web|url=https://www.cdc.gov/niosh/docs/2013-145/|title=Occupational Exposure to Carbon Nanotubes and Nanofibers|last=|first=|date=April 2013|website=U.S. National Institute for Occupational Safety and Health|pages=15–17|archive-url=|archive-date=|dead-url=|access-date=2017-02-17}}</ref> |
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== References == |
== References == |
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Revision as of 20:15, 20 February 2017
Intratracheal instillation is the introduction of a substance directly into the trachea. It is widely used to test the respiratory toxicity of a substance as an alternative to inhalation in animal testing. Intratracheal instillation was reported as early as 1923 in studies of the carcinogenicity of coal tar. Modern methodology was developed by several research groups in the 1970s.[1]
As compared to inhalation, intratracheal instillation allows greater control over the dose and location of the substance, is cheaper and less technically demanding, allows lower amounts of scarce or expensive substances to be used, allows substances to be tested that can be inhaled by humans but not small mammals, and minimizes exposure to laboratory workers and to the skin of laboratory animals. Disadvantages include its nonphysiological and invasive nature, the confounding effects of the delivery vehicle and anesthesia, and the fact that it bypasses the upper respiratory tract. Instillation results in a less uniform distribution of the substance than inhalation, and the substance is cleared from the respiratory tract more slowly.[1] Their results provide a quick screen of potential toxicity and can be used to test its mechanism, but may not be directly applicable to occupational exposure that occurs over an extended period.[2]
Methodology
Intratracheal instillation is often performed with mice, rats, or hamsters, with hamsters often preferred because their mouth can be opened widely to aid viewing the procedure,[3] and because they are more resistant to lung diseases than rats.[4] Instillation is performed either through inserting a needle or catheter down the mouth and throat, or through surgically exposing the trachea and penetrating it with a needle. Generally, short-acting inhaled anesthetic drugs such as halothane, metaphane, or enflurane are used during the instillation procedure. Saline solution is usually used as a delivery vehicle in a typical volume of 1–2 mL/kg body weight.[1] A wide range of substances can be tested, including both soluble materials and insoluble particles or fibers, including nanomaterials.[1][2][5]
References
- ^ a b c d Driscoll, Kevin E.; Costa, Daniel L.; Hatch, Gary; Henderson, Rogene; Oberdorster, Gunter; Salem, Harry; Schlesinger, Richard B. (2000-05-01). "Intratracheal Instillation as an Exposure Technique for the Evaluation of Respiratory Tract Toxicity: Uses and Limitations". Toxicological Sciences. 55 (1): 24–35. doi:10.1093/toxsci/55.1.24. ISSN 1096-6080. PMID 10788556.
- ^ a b "Occupational Exposure to Refractory Ceramic Fibers". U.S. National Institute for Occupational Safety and Health. May 2006. pp. 38–39, 42, 89. Retrieved 2017-02-17.
{{cite web}}: Cite has empty unknown parameter:|dead-url=(help) - ^ Zhao, Yuliang (2016-12-12). Toxicology of Nanomaterials. John Wiley & Sons. p. 163. ISBN 9783527337972.
- ^ Schiller, Erich (2013-06-29). Free Radicals and Inhalation Pathology. Springer Science & Business Media. p. 63. ISBN 9783642186196.
- ^ "Occupational Exposure to Carbon Nanotubes and Nanofibers". U.S. National Institute for Occupational Safety and Health. April 2013. pp. 15–17. Retrieved 2017-02-17.
{{cite web}}: Cite has empty unknown parameter:|dead-url=(help)