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Molecular and Cellular Biology, February 2004, p. 1667-1679, Vol. 24, No. 4
0270-7306/04/$08.00+0     DOI: 10.1128/MCB.24.4.1667-1679.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Placental Failure and Impaired Vasculogenesis Result in Embryonic Lethality for Neuropathy Target Esterase-Deficient Mice

Markus Moser,1* Yong Li,2 Kristina Vaupel,1 Doris Kretzschmar,3 Reinhart Kluge,4 Paul Glynn,2 and Reinhard Buettner5

Max Planck Institute for Biochemistry, D-82152 Martinsried,1 Max Rubner Laboratorium, German Institute of Human Nutrition, D-14558 Bergholz-Rehbrücke,4 Institute of Pathology, University Bonn, D-53127 Bonn, Germany,5 MRC Toxicology Unit, University of Leicester, Leicester LE1 9HN, United Kingdom,2 Center for Research on Occupational and Environmental Toxicology L606, Oregon Health and Sciences University, Portland, Oregon 97201-30983

Received 19 March 2003/ Returned for modification 26 April 2003/ Accepted 21 October 2003

Age-dependent neurodegeneration resulting from widespread apoptosis of neurons and glia characterize the Drosophila Swiss Cheese (SWS) mutant. Neuropathy target esterase (NTE), the vertebrate homologue of SWS, reacts with organophosphates which initiate a syndrome of axonal degeneration. NTE is expressed in neurons and a variety of nonneuronal cell types in adults and fetal mice. To investigate the physiological functions of NTE, we inactivated its gene by targeted mutagenesis in embryonic stem cells. Heterozygous NTE+/- mice displayed a 50% reduction in NTE activity but underwent normal organ development. Complete inactivation of the NTE gene resulted in embryonic lethality, which became evident after gastrulation at embryonic day 9 postcoitum (E9). As early as E7.5, mutant embryos revealed growth retardation which did not reflect impaired cell proliferation but rather resulted from failed placental development; as a consequence, massive apoptosis within the developing embryo preceded its resorption. Histological analysis indicated that NTE is essential for the formation of the labyrinth layer and survival and differentiation of secondary giant cells. Additionally, impairment of vasculogenesis in the yolk sacs and embryos of null mutant conceptuses suggested that NTE is also required for normal blood vessel development.

* Corresponding author. Mailing address: Max Planck Institute for Biochemistry, Am Klopferspitz 18A, D-82152 Martinsried, Germany. Phone: 49 89 8578 2849. Fax: 49 89 8578 2422. E-mail: moser{at}biochem.mpg.de.

Molecular and Cellular Biology, February 2004, p. 1667-1679, Vol. 24, No. 4
0022-538X/04/$08.00+0     DOI: 10.1128/MCB.24.4.1667-1679.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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