| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Regular Article TA |
a Cryobiology Research Institute, Herman B Wells Center for Pediatric Research, Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana 46202
b Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, Indiana 47907
c Advanced Fertility Institute, Methodist Medical Plaza Carmel, Indianapolis, Indiana 46280
ABSTRACT
Current mammalian embryo cryopreservation protocols typically employ an interrupted slow freezing (ISF) procedure. In general, ISF consists of initial slow cooling, which raises the extracellular solute concentration, and results in cell dehydration. Permeating cryoprotective agents (CPAs), such as dimethyl sulfoxide (DMSO), are typically included in the medium to protect the cells against high solute concentrations. As this ISF procedure continues, slow cooling is terminated at an intermediate temperature (Tp), followed by plunging into liquid nitrogen (LN2). If the slow cooling step allowed a critical concentration ([CPA]c) of CPA to be reached within the cell, the CPA will interact with the remaining intracellular water during rapid cooling, resulting in the majority of the intracellular solution becoming vitrified and preventing damaging intracellular ice formation (IIF). This study presents a theoretical model to develop efficient ISF procedures, on the basis of previously developed data for the rat zygote. The model was used to select values of initial CPA concentrations and slow cooling rates (from initial estimated ranges of 0 to 4 molal DMSO and 0 to 2.5°C/min cooling rates) that would allow the intracellular solute concentration to exceed the critical concentration. The optimal combination was then determined from this range based on minimizing the duration of slow cooling.
First decision: 23 March 2000.
1 Supported by The Cryobiology Research Institute, grants R01-AA10722 and R24RR13195 from the National Institutes of Health, and Harlan Sprague Dawley, Inc.
2 Correspondence: John K. Critser, Indiana University School of Medicine, Cancer Research Building, Wells Center for Pediatric Research, 1044 West Walnut St., Room 454, Indianapolis, IN 46202. FAX: 317 274 8679; jcritser{at}iupui.edu
This article has been cited by other articles:
|
|
 |
|
  E. Nsabimana, S. Kisidayova, D. Macheboeuf, C. J. Newbold, and J. P. Jouany Two-Step Freezing Procedure for Cryopreservation of Rumen Ciliates, an Effective Tool for Creation of a Frozen Rumen Protozoa Bank Appl. Envir. Microbiol., July 1, 2003; 69(7): 3826 - 3832. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 Y. Agca, J. Gilmore, M. Byers, E. J. Woods, J. Liu, and J. K. Critser Osmotic Characteristics of Mouse Spermatozoa in the Presence of Extenders and Sugars Biol Reprod, November 1, 2002; 67(5): 1493 - 1501. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 F. Izadyar, J. J. Matthijs-Rijsenbilt, K. D. Ouden, L. B. Creemers, H. Woelders, and D. G. de Rooij Development of a Cryopreservation Protocol for Type A Spermatogonia J Androl, July 1, 2002; 23(4): 537 - 545. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. Keskintepe, Y. Agca, G. A. Pacholczyk, A. Machnicka, and J. K. Critser Use of Cryopreserved Pronuclear Embryos for the Production of Transgenic Mice Biol Reprod, August 1, 2001; 65(2): 407 - 411. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
