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Disruption of the midkine gene ( Mdk ) resulted in altered expression of a calcium binding protein in the hippocampus of infant mice and their abnormal behaviour

Disruption of the midkine gene ( Mdk ) resulted in altered expression of a calcium binding... Background: Midkine (MK) is a growth factor implicated in the development and repair of various tissues, especially neural tissues. However, its in vivo function has not been clarified. Results: Knockout mice lacking the MK gene (Mdk) showed no gross abnormalities. We closely analysed postnatal brain development in Mdk(–/–) mice using calcium binding proteins as markers to distinguish neuronal subpopulations. Intense and prolonged calretinin expression was found in the dentate gyrus granule cell layer of the hippocampus of infant Mdk(–/–) mice. In infant Mdk(+/+) mice, calretinin expression in the granule cell layer was weaker, and had disappeared by 4 weeks after birth, when calretinin expression still persisted in Mdk(–/–) mice. Furthermore, 4 weeks after birth, Mdk(–/–) mice showed a deficit in their working memory, as revealed by a Y‐maze test, and had an increased anxiety, as demonstrated by the elevated plus‐maze test. Conclusion: Midkine plays an important role in the regulation of postnatal development of the hippocampus. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Genes to Cells Wiley

Disruption of the midkine gene ( Mdk ) resulted in altered expression of a calcium binding protein in the hippocampus of infant mice and their abnormal behaviour

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References (60)

Publisher
Wiley
Copyright
Blackwell Science Ltd, Oxford
ISSN
1356-9597
eISSN
1365-2443
DOI
10.1046/j.1365-2443.1998.00231.x
Publisher site
See Article on Publisher Site

Abstract

Background: Midkine (MK) is a growth factor implicated in the development and repair of various tissues, especially neural tissues. However, its in vivo function has not been clarified. Results: Knockout mice lacking the MK gene (Mdk) showed no gross abnormalities. We closely analysed postnatal brain development in Mdk(–/–) mice using calcium binding proteins as markers to distinguish neuronal subpopulations. Intense and prolonged calretinin expression was found in the dentate gyrus granule cell layer of the hippocampus of infant Mdk(–/–) mice. In infant Mdk(+/+) mice, calretinin expression in the granule cell layer was weaker, and had disappeared by 4 weeks after birth, when calretinin expression still persisted in Mdk(–/–) mice. Furthermore, 4 weeks after birth, Mdk(–/–) mice showed a deficit in their working memory, as revealed by a Y‐maze test, and had an increased anxiety, as demonstrated by the elevated plus‐maze test. Conclusion: Midkine plays an important role in the regulation of postnatal development of the hippocampus.

Journal

Genes to CellsWiley

Published: Dec 1, 1998

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