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1 Departments of Anatomy and Cell Biology, The University of Iowa Roy J. and Lucille A.Carver College of Medicine, Iowa City, Iowa, USA
2 Department of Internal Medicine, The University of Iowa Roy J. and Lucille A.Carver College of Medicine, Iowa City, Iowa, USA
3 Department of Internal Medicine, The University of Iowa Roy J. and Lucille A.Carver College of Medicine, Iowa City, Iowa, USA; Department of Neurology, The University of Iowa Roy J. and Lucille A.Carver College of Medicine, Iowa City, Iowa, USA
* To whom correspondence should be addressed. E-mail: robin-davisson{at}uiowa.edu.
The Cre/loxP system has shown promise for investigating genes involved in nervous system function and pathology, although its application for studying central neural regulation of cardiovascular function and disease has not been explored. Here, we report for the first time that recombination of loxP-flanked genes can be achieved in discrete cardiovascular regulatory nuclei of adult mouse brain using targeted delivery of adenovirus (Ad) or feline immunodeficiency virus (FIV) bearing Cre recombinase (Ad- Cre, FIV-Cre). Single stereotaxic microinjections of Ad-Cre or FIV-Cre into specific nuclei along the subfornical organ-hypothalamic-hypophyseal and brainstemparabrachial axes resulted in robust and highly localized gene deletion as early as 7 days and for as long as 3 weeks in a reporter mouse model in which Cre recombinase activates -galactosidase expression. An even greater selectivity in Cre-mediated gene deletion could be achieved in unique subpopulations of cells, such as vasopressinsynthesizing magnocellular neurons, by delivering Ad-Cre via retrograde transport. Moreover, Ad-Cre and FIV-Cre induced gene recombination in differential cell populations within these cardiovascular nuclei. FIV-Cre infection resulted in LacZ activation selectively in neurons, while both neuronal and glial cell types underwent gene recombination upon infection with Ad-Cre. These results establish the feasibility of using a combination of viral and Cre/loxP technologies to target specific cardiovascular nuclei in the brain for conditional gene modification, and suggest the potential of this approach for determining the functional role of genes within these sites.
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