Role of DDC-4/sFRP-4, a secreted Frizzled-related protein, at the onset of apoptosis in mammary involution

Using differential display, we isolated DDC-4, a s ecreted frizzled-related protein (sFRP), which is induced in the physiological apoptosis of hormonally regulated, reproductive tissues such as mammary gland, prostate, corpus luteum and uterus. The role of this gene in apoptosis was studied in anima...

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Veröffentlicht in:Cell death and differentiation 2003-05, Vol.10 (5), p.528-538
Hauptverfasser: Lacher, M D, Siegenthaler, A, Jäger, R, Yan, Xi, Hett, S, Xuan, L, Saurer, S, Lareu, R R, Dharmarajan, A M, Friis, R
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container_end_page 538
container_issue 5
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container_title Cell death and differentiation
container_volume 10
creator Lacher, M D
Siegenthaler, A
Jäger, R
Yan, Xi
Hett, S
Xuan, L
Saurer, S
Lareu, R R
Dharmarajan, A M
Friis, R
description Using differential display, we isolated DDC-4, a s ecreted frizzled-related protein (sFRP), which is induced in the physiological apoptosis of hormonally regulated, reproductive tissues such as mammary gland, prostate, corpus luteum and uterus. The role of this gene in apoptosis was studied in animals overexpressing ectopic DDC-4/sFRP-4. Transgenic mice bearing the DDC-4/sFRP-4 cDNA under the control of the MMTV-LTR promoter showed lactational insufficiency and many apoptotic cells in the alveoli between day 19 of pregnancy and day 4 of lactation as demonstrated by TUNEL reaction and the presence of activated caspase-3. We performed a PKB/Akt kinase assay and studied several of its substrates using phosphorylation-specific antibodies to show reduced phosphorylation in PKB/Akt itself, as well as in glycogen synthetase kinase-3 β (GSK-3 β ), BAD, and Forkhead. Taken together, our results show a role for DDC-4/sFRP-4 in abrogating an epithelial cell survival pathway at the onset of mammary gland involution.
doi_str_mv 10.1038/sj.cdd.4401197
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subjects Animals
Apoptosis
Apoptosis - physiology
bcl-Associated Death Protein
Biochemistry
Biomedical and Life Sciences
Breastfeeding & lactation
Carrier Proteins - metabolism
Caspase 3
Caspases - metabolism
Cell Biology
Cell Cycle Analysis
Cell death
Cell Line
Cell Survival - physiology
Cells, Cultured
Electrophoresis, Polyacrylamide Gel
Epithelial Cells - cytology
Epithelial Cells - metabolism
Female
Fibroblasts
Forkhead Transcription Factors
Genes
Glycogen Synthase Kinase 3 - metabolism
Glycogen Synthase Kinase 3 beta
Kinases
Life Sciences
Ligands
Mammary Glands, Animal - cytology
Mammary Glands, Animal - physiology
Membrane Proteins - genetics
Membrane Proteins - physiology
Mice
Mice, Inbred BALB C
Mice, Transgenic
Nuclear Proteins - metabolism
original-paper
Phenotype
Phosphorylation
Physiology
Prostate
Protein-Serine-Threonine Kinases
Proteins
Proteins - physiology
Proto-Oncogene Proteins - metabolism
Proto-Oncogene Proteins c-akt
Signal transduction
Stem Cells
Transcription Factors - metabolism
Transgenes - genetics
Transgenic animals
title Role of DDC-4/sFRP-4, a secreted Frizzled-related protein, at the onset of apoptosis in mammary involution
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