Essential Role of the Apolipoprotein E Receptor-2 in Sperm Development

The apolipoprotein (apo) E receptor-2 (apoER2) is a member of the low density lipoprotein receptor gene family and an important regulator of neuronal migration. It acts as a receptor for the signaling factor Reelin and provides positional cues to neurons that migrate to their proper position in the...

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Veröffentlicht in:The Journal of biological chemistry 2003-06, Vol.278 (26), p.23989-23995
Hauptverfasser: Andersen, Olav M, Yeung, Ching-Hei, Vorum, Henrik, Wellner, Maren, Andreassen, Thomas K, Erdmann, Bettina, Mueller, Eva-Christina, Herz, Joachim, Otto, Albrecht, Cooper, Trevor G, Willnow, Thomas E
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container_end_page 23995
container_issue 26
container_start_page 23989
container_title The Journal of biological chemistry
container_volume 278
creator Andersen, Olav M
Yeung, Ching-Hei
Vorum, Henrik
Wellner, Maren
Andreassen, Thomas K
Erdmann, Bettina
Mueller, Eva-Christina
Herz, Joachim
Otto, Albrecht
Cooper, Trevor G
Willnow, Thomas E
description The apolipoprotein (apo) E receptor-2 (apoER2) is a member of the low density lipoprotein receptor gene family and an important regulator of neuronal migration. It acts as a receptor for the signaling factor Reelin and provides positional cues to neurons that migrate to their proper position in the developing brain. Besides brain formation defects, apoER2-deficient mice also exhibit male infertility. The role of the receptor in male reproduction, however, remained unclear. Here we demonstrate that apoER2 is highly expressed in the initial segment of the epididymis, where it affects the functional expression of clusterin and phospholipid hydroperoxide glutathione peroxidase (PHGPx), two proteins required for sperm maturation. Reduced PHGPx expression in apoER2 knockout mice results in the inability of the sperm to regulate the cell volume and in abnormal sperm morphology and immotility. Because insufficient expression of PHGPx is a major cause of infertility in men, these findings not only highlight an important new function for apoER2 that is unrelated to neuronal migration, but they also suggest a possible role for apoER2 in human infertility.
doi_str_mv 10.1074/jbc.M302157200
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subjects Animals
Cell Size
Clusterin
Epididymis
Glutathione Peroxidase
Glycoproteins
Infertility, Male - etiology
LDL-Receptor Related Proteins
Male
Mice
Mice, Knockout
Molecular Chaperones
Phospholipid Hydroperoxide Glutathione Peroxidase
Receptors, Lipoprotein - physiology
Sperm Maturation
Sperm Motility
Spermatogenesis
Spermatozoa - cytology
Spermatozoa - growth & development
title Essential Role of the Apolipoprotein E Receptor-2 in Sperm Development
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