title: Stored of Hsp72/Hsp73 in germinal vesicle-stage mouse oocytes.
abstract: Heat-shock proteins (hsps) Hsp72 and Hsp73 are the stored maternal proteins found in mouse oocytes. Both hsps appear in mouse oocytes at germinal vesicle (GV) and metaphase II (M-II)-stages as previously demonstrated by immunoblotting analysis. In this report, we further determined the presences of Hsp72/Hsp73 proteins in mouse embryos at stages of 2-pronucleus, arrested 1-cell, 2-cell, arrested 2-cell, 4-cell, arrested 4-cell, 8-cell to morula and blastocyst. Except for the blastocyst stage, the Hsp72/Hsp73 proteins were detectable in most embryo stages. The concentration of Hsp72/Hsp73 in GV-stage oocytes was higher than that in M-II-stage oocytes, and in any stages of embryos before implantation. A dramatical increase in Hsp72/Hsp73 expression was found at the 2-cell stage. Together with these findings, we speculated that hsps accumulated or stored earlier in the GV-stage mouse oocytes to protect the oocytes against environmental influences acting on ovary, and hsps may be required for zygotic gene activation and provided a protective effect against apoptosis.
authors.affiliation: Department of Obstetrics and Gynecology, Chung Shan Medical University Hospital, Taichung, Taiwan, China.
authors.forename: C H
authors.initials: CH
authors.lastname: Liu
authors.forename: C C
authors.initials: CC
authors.lastname: Yang
authors.forename: D P C
authors.initials: DP
authors.lastname: Lin
authors.forename: M H
authors.initials: MH
authors.lastname: Wu
authors.forename: K J
authors.initials: KJ
authors.lastname: Tsai
mesh_terms: D000818:Animals; D015153:Blotting, Western / Q000662:veterinary; D002352:Carrier Proteins / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel / Q000662:veterinary; D004622:Embryo, Mammalian / Q000378:metabolism*; D047108:Embryonic Development; D005260:Female; D050883:HSC70 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins; D050884:HSP72 Heat-Shock Proteins; D006360:Heat-Shock Proteins / Q000378:metabolism*; D015151:Immunoblotting / Q000662:veterinary; D051379:Mice; D008813:Mice, Inbred ICR; D033661:Oocysts / Q000378:metabolism*; D011247:Pregnancy
chemical_list: D002352:Carrier Proteins; D050883:HSC70 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins; D050884:HSP72 Heat-Shock Proteins; D006360:Heat-Shock Proteins; C494372:Hspa8 protein, mouse