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In Vivo Gene Delivery into Mouse Mammary Epithelial Cells Through Mammary Intraductal Injection

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JOURNAL OF VISUALIZED EXPERIMENTS
DOI: 10.3791/64718

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Mouse mammary glands have ductal trees lined by epithelial cells with one opening at each nipple. Introducing genes into these epithelial cells is crucial for studying gene function and generating mammary tumor models. This can be done by intraductal injection of a viral vector carrying the genes. Different types of viral vectors can be used, such as lentiviruses and retroviruses. This study demonstrates the delivery of genes of interest into mammary epithelial cells using intraductal injection of a viral vector, and the subsequent expression and effects of these genes.
Mouse mammary glands comprise ductal trees, which are lined by epithelial cells and have one opening at the tip of each nipple. The epithelial cells play a major role in mammary gland function and are the origin of most mammary tumors. Introducing genes of interest into mouse mammary epithelial cells is a critical step in evaluating gene function in epithelial cells and generating mouse mammary tumor models. This goal can be accomplished through the intraductal injection of a viral vector carrying the genes of interest into the mouse mammary ductal tree. The injected virus subsequently infects mammary epithelial cells, bringing in the genes of interest. The viral vector can be lentiviral, retroviral, adenoviral, or adenovirus-associated viral (AAV). This study demonstrates how a gene of interest is delivered into mammary epithelial cells through mouse mammary intraductal injection of a viral vector. A lentivirus carrying GFP is used to show stable expression of a delivered gene, and a retrovirus carrying Erbb2 (HER2/Neu) is used to demonstrate oncogene-induced atypical hyperplastic lesions and mammary tumors.

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