Abstract
Apoptosis has been reported in oocytes and human preimplantation embryos both in vitro and in vivo. BCL-2 family proteins are likely to play a pivotal role in controlling oocyte and early embryo degeneration. However, no BCL-2-related survival factors have been identified that would specifically function during oocyte maturation, after fertilization and during early embryogenesis. Here, we performed a comprehensive tissue expression pattern analysis of the BCL-2 family at the mRNA level. While expression of various members was detected in human oocytes and during early primate embryogenesis, our data indicate that BCL2L10 is the predominant maternally loaded Bcl-2 family transcript, revealing an evolutionary conserved expression profile at the egg-to-zygote transition. We provide evidence that BCL2L10 is associated with the microtubule binding protein translationally controlled tumor protein and mitochondria, with a stage-specific redistribution along the pericortical regulatory ooplasm. In dying oocytes, BCL2L10 colocalized with proapoptotic BAX and neutralization of BCL2L10 accelerated oocyte death. We propose BCL2L10 as a novel and prime candidate related to oocyte maturation, fertility, and embryo developmental competence.
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Acknowledgments
We wish to thank the ART/PGD Division and Affymetrix™ microarray platform at IRB (CHU Montpellier) and ART Center of Lyon (CECOS) for their assistance. We gratefully acknowledge Dr. Ines Lein and Dr. Kerstin Mätz-Rensing at the German Primate Center (DPZ GmbH), Leibniz Institute for Primate Research (EUPRIM-Net), for the provision of the marmoset ovary slices. We thank Keith Latham, Bela Patel, and Namdori Mtango for their expert assistance in blot hybridizations. The PREGER resource is supported by a grant from the NIH-NCRR (R24 RR-15253). We are grateful to Fabienne Simian and Claire Lionnet (PLATIM, ENS Lyon) and to Marie Teixeira and Denise Aubert (Animal Facility PBES) for their help. Special thanks are extended to Imène Boumela, Séverine Venet, and Stéphane Gasca. YG is a recipient of an MRT fellowship. This work was partially supported by grants from La Ligue Contre le Cancer (Drôme et Rhône) and Ferring and Organon Pharmaceuticals (France).
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Supplementary file 2. Expression of BCL2L10 in human oocytes analyzed by immunofluorescence. Detection of BCL2L10 pertaining to different maturational stages of human oocytes. GV (A), MI (B), MII-stage (C) oocytes visualized by immunofluorescence with anti-BCL2L10 antibody (upper panel) and phase contrast (lower panel). Control staining (without primary antibody) was consistently negative (D). Degenerating, unfertilized oocyte (E). For eight BCL-2 family proteins (BCL-2, BCL-X, BFL-1, BCL-W, MCL-1, BID, BIM, BMF, BAD) analyzed in this manner, no appreciable immunofluorescence was detected, except for BCL-X, MCL-1, and BAD (not shown). Supplementary file 3. A Yeast two-hybrid interaction matrix for BCL2L10, BCL2, BAX, and binding partners isolated in the screen. Yeast clones expressing BCL2L10, BCL2, and BAX in bait vector pGILDA were mated by replica plating with clones expressing BCL2L10, BAX, p53, β-actin, γ-actin, HINT1, and TCTP in prey vector pJG4-5. Picture was taken after 48 h incubation at 30°C. Interactions are measured by the development of a blue color following induction of the LacZ reporter gene. BCL2L10 appears to bind to BAX, HINT1, and TCTP as revealed by light blue coloration. BCL2 binds most strongly to BAX and TCTP, as well as to β-actin, γ-actin, and HINT1. BAX binds to itself but not to the other proteins. Expression of the different proteins has been checked by Western blotting (not shown). The BAX–BAX and BAX–BCL2 interactions served as positive controls for the yeast two-hybrid interaction assay. B Histidine pull down assay of the interaction in vitro between GST-BCL2L10 and TCTP-His6. TCTP-His6 was fixed on Ni-NTA beads and GST (lane 2) or GST-BCL2L10 (lane 3) was applied on the complex. After elution, the attached protein complexes were resolved in a 12% polyacrylamide gel. Anti-GST and anti-TCTP antibodies were used in the Western blot. TCTP-His6 bound specifically to GST-BCL2L10 (lane 3), whereas no interaction between TCTP-His6 and GST was detected (lane 2). Lane 1 (control): GST-BCL2L10 did not interact with Ni-NTA resin. C Indirect ELISA binding assay. Increasing concentrations of purified His-tagged TCTP was used to coat wells of a 96-well plate. Serial dilutions of GST-BCL2L10 were incubated with immobilized TCTP-His6. Binding was detected using anti-GST antibody. GST-BCL2L10 demonstrates dose-dependent binding to immobilized TCTP-His6. GST alone did not demonstrate significant binding to immobilized TCTP-His6. Intensity of the linear signal obtained with GST was subtracted from each experimental point. Supplementary file 4. Confocal images of in vitro matured human oocytes showing TCTP/tubulin double-staining. MII-stage human oocytes (C, D) were double-stained with antibodies against TCTP and microtubules. A5–A8, B5–B8 Enlarged images from A1–A4 and B1–B4, respectively. A1–A8, B1–B8 Two different focal planes of the same oocyte. Microtubules and TCTP are abundant in the peripheral region (A4, A8) and around the meiotic apparatus (B4, B8). Scale bar, 10 μm (PPT 3333 kb)
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Supplementary material to Figs. 7 and 9 (PPT 486 kb)
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Guillemin, Y., Lalle, P., Gillet, G. et al. Oocytes and early embryos selectively express the survival factor BCL2L10. J Mol Med 87, 923–940 (2009). https://doi.org/10.1007/s00109-009-0495-7
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DOI: https://doi.org/10.1007/s00109-009-0495-7