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Cryobiology ; 97: 76-84, 2020 12.
Article in English | MEDLINE | ID: mdl-33038414

ABSTRACT

Cryoprotectants play a vital role in the cryopreservation process, protecting biological samples from freezing damage. Here, we evaluate the effects of the combination and interaction of different extenders with permeable and non-permeable cryoprotectants, on the cryopreservation of Danio rerio sperm, analyzing the effects of cryopreservation through a broad approach to variables. Two extenders were used, Hank's balanced salt solution (HBSS) and Ginsburg's solution. Eight cryoprotective solutions (CS) were used: CS1 (HBSS + Me2SO 8%), CS2 (HBSS + Methanol 8%), CS3 (HBSS + Me2SO 8% + Skim milk powder 15%), CS4 (HBSS + Methanol 8% + Skim milk powder 15%), CS5 (Ginsburg + Me2SO 8%), CS6 (Ginsburg + Methanol 8%), CS7 (Ginsburg + Me2SO 8% + Skim milk powder 15%) and CS8 (Ginsburg + Methanol 8% + Skim milk powder 15%). The samples were cryopreserved in cryovials for 20 min on dry ice, stored in liquid nitrogen, thawed at 38 °C for 10 s, and analyzed. In addition to increasing viability, we show that powdered milk also allows for better preservation of the membrane and normal cell morphology, and protects the sperm cells from DNA damage and oxidative stress caused by cryopreservation.


Subject(s)
Cryopreservation , Semen Preservation , Animals , Cryopreservation/methods , Cryoprotective Agents/pharmacology , DNA Damage , Dimethyl Sulfoxide , Male , Milk , Oxidative Stress , Powders , Sperm Motility , Spermatozoa , Zebrafish
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