Name: analyzing the function of small gtpases by microinjection of plasmids into polarized epithelial cells
Uploaded: 2011-05-31T12:00:00
Description: Watch this Scientific Journal Video about Analyzing the Function of Small GTPases by Microinjection of Plasmids into Polarized Epithelial Cells at JoVE.com

Эта работа финансировалась за счет гранта от Национального института здоровья (GM070736) к H. Fölsch. SF Анг была поддержана * STAR награды стипендии Высшее и RS Кан был поддержан клеточной и молекулярной основы болезни программы обучения (GM8061)

1. Выделение плазмидной ДНК <ol><li> Используйте Sigma-Aldrich эндотоксина бесплатный комплект maxiprep подготовить эндотоксина свободной ДНК в соответствии с протоколом производителя. Этот комплект работает на нас, потому что она надежно удаляет любые эндотоксинов из препаратов ДНК. Эндотоксины...

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Наиболее важных шагов для успешного эксперимента микроинъекции являются качество и чистоту ДНК и полярность ваших клеток. Без поляризованных клеток, инъекции ваш контроль будет уже mistargeted VSVG и эксперимент не может быть использован. Если ДНК имеет низкое качество, ДНК может засорить ин...

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analyzing the function of small gtpases by microinjection of plasmids into polarized epithelial cells

Epithelial cells polarize their plasma membrane into biochemically and functionally distinct apical and basolateral domains where the apical domain faces the 'free' surfaces and the basolateral membrane is in contact with the substrate and neighboring cells. Both membrane domains are separated by tight junctions, which form a diffusion barrier. Apical-basolateral polarization can be recapitulated successfully in culture when epithelial cells such as Madin-Darby Canine Kidney (MDCK) cells are seeded at high density on polycarbonate filters and cultured for several days 1 2. Establishment and maintenance of cell polarity is regulated by an array of small GTPases of the Ras superfamily such as RalA, Cdc42, Rab8, Rab10 and Rab13 3 4 5 6 7. Like all GTPases these proteins cycle between an inactive GDP-bound state and an active GTP-bound state. Specific mutations in the nucleotide binding regions interfere with this cycling 8. For example, Rab13T22N is permanently locked in the GDP-form and thus dubbed 'dominant negative', whereas Rab13Q67L can no longer hydrolyze GTP and is thus locked in a 'dominant active' state 7. To analyze their function in cells both dominant negative and dominant active alleles of GTPases are typically expressed at high levels to interfere with the function of the endogenous proteins 9. An elegant way to achieve high levels of overexpression in a short amount of time is to introduce the plasmids encoding the relevant proteins directly into the nuclei of polarized cells grown on filter supports using microinjection technique. This is often combined with the co-injection of reporter plasmids that encode plasma membrane receptors that are specifically sorted to the apical or basolateral domain. A cargo frequently used to analyze cargo sorting to the basolateral domain is a temperature sensitive allele of the vesicular stomatitis virus glycoprotein (VSVGts045) 10. This protein cannot fold properly at 39&deg;C and will thus be retained in the endoplasmic reticulum (ER) while the regulatory protein of interest is assembled in the cytosol. A shift to 31&deg;C will then allow VSVGts045 to fold properly, leave the ER and travel to the plasma membrane 11. This chase is typically performed in the presence of cycloheximide to prevent further protein synthesis leading to cleaner results. Here we describe in detail the procedure of microinjecting plasmids into polarized cells and subsequent incubations including temperature shifts that allow a comprehensive analysis of regulatory proteins involved in basolateral sorting.

Watch this Scientific Journal Video about Analyzing the Function of Small GTPases by Microinjection of Plasmids into Polarized Epithelial Cells at JoVE.com

Analyzing the Function of Small GTPases by Microinjection of Plasmids into Polarized Epithelial Cells

Эта статья подробно описывает процедуры, связанные с гиперэкспрессией и анализа малых ГТФаз в поляризованных эпителиальных клеток с помощью микроинъекции техники.

Анализ функций малого ГТФаз по микроинъекции Плазмиды в поляризованных эпителиальных клеток

Epithelial cells polarize their plasma membrane into biochemically and functionally distinct apical and basolateral domains where the apical domain faces ...

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