Freeze-dried primate sperm retains early reproductive potential after intracytoplasmic sperm injection Luis Gabriel Sánchez-Partida, Ph.D., Calvin R.

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Presentation transcript:

Freeze-dried primate sperm retains early reproductive potential after intracytoplasmic sperm injection Luis Gabriel Sánchez-Partida, Ph.D., Calvin R. Simerly, Ph.D., João Ramalho-Santos, Ph.D. Fertility and Sterility Volume 89, Issue 3, Pages 742-745 (March 2008) DOI: 10.1016/j.fertnstert.2007.02.066 Copyright © 2008 American Society for Reproductive Medicine Terms and Conditions

Figure 1 Organelle and functional integrity of freeze-dried rhesus sperm. Deoxyribonucleic acid of freeze-dried rhesus sperm labeled with (A) 6-diamino-2-phenylindole (DAPI, blue), showing no obvious morphological damage and with (B) propidium iodide (red), indicating disrupted plasma membrane. Acrosomal contents of fresh ejaculated (C) and freeze-dried (D) sperm were visualized by using the fluorescent lectin peanut agglutinin fluorescein isothiocyanate conjugate (green) and DNA (DAPI, blue). (E–G) The vital probe JC-1 was used to assess mitochondrial activity. (E) In fresh ejaculated sperm, yellow-orange fluorescence, indicative of both high (red) and low (green) mitochondrial potential, was observed. In freeze-dried rhesus sperm, only low (green) mitochondrial membrane potential was visualized (F), whereas no mitochondrial activity was observed in fixed sperm (G). By using electron microscopy, we could show that freeze-drying sperm in a 0.3 M trehalose solution maintained the integrity of the proximal centrioles (H); however, the proximal centrioles were damaged when sperm were freeze-dried in a Chatot-Biozek-Bavister (CBZ) medium (I). After ICSI, fresh (J) and freeze-dried (K, L) sperm were able to nucleate microtubules (green) at the base of the sperm head, forming the sperm aster that directs pronuclear apposition. Blue, DNA. (M) Notwithstanding markers of cell death, rehydrated FD sperm retain some reproductive potency after ICSI, as assayed by embryonic development to the 8- to 16-cell stage in vitro. Fertility and Sterility 2008 89, 742-745DOI: (10.1016/j.fertnstert.2007.02.066) Copyright © 2008 American Society for Reproductive Medicine Terms and Conditions