Journal of Veterinary Clinics (한국임상수의학회지)

The Korean Society of Veterinary Clinics (한국임상수의학회)
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Dog Sperm Cryopreservation Using Glucose in Glycerol-free TRIS: Glucose Concentration, Exposure Time

Glycerol-free TRIS 배지내 glucose를 이용한 개 정자 동결: 포도당 농도, 노출시간

  • Yu, Il-Jeoung (Department of Theriogenology and Reproductive Biotechnologies, College of Veterinary Medicine and Bio-safety Research Institute, Chonbuk National University)
  • Accepted : 2013.12.02
  • Published : 2013.12.31
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Abstract

The aim of the present study was to develop glycerol-free TRIS extender using glucose for dog sperm cryopreservation. We determined the appropriate concentration of glucose in glycerol-free TRIS and the exposure time in glycerol-free TRIS containing 0.3 M glucose at $4^{\circ}C$. Ejaculates of six dog sperm were cooled in glycerol-free TRIS through $4^{\circ}C$ for 100 min, cooled at $4^{\circ}C$ in TRIS with different glucose concentrations 0 M, 0.04 M, 0.1 M, 0.2 M and 0.3 M, respectively for 30 min followed by cryopreservation. After thawing at $37^{\circ}C$ for 25 sec, membrane and acrosome integrities of dog sperm were evaluated. In addition, the effect of exposure time (10, 30, 50 and 70 min) of sperm to glycerol-free TRIS containing 0.3 M glucose at $4^{\circ}C$ on progressive motility, viability, and DNA integrity following sperm cryopreservation was studied. Membrane integrity and acrosome integrity were assessed by 6-carboxyfluoresceindiacetate (6-CFDA)/propidium iodide (PI) fluorescent staining and Pisum sativum agglutinin conjugated to fluorescein isothiocyanate, respectively. DNA integrity was assessed by terminal deoxynucleotidyl transferase dUTP nick end labeling, using flow cytometry. Sperm frozen in glycerol-free TRIS supplemented with 0.2 M or 0.3 M glucose have an intact plasma membrane (CFDA+/PI-) after cryopreservation than sperm frozen in the extenders with lower glucose concentrations (p<0.05). Acrosome integrity was significantly higher in the 0.3 M group than less than 0.1 M groups (p<0.05). The sperm DNA fragmentation index did not differ according to exposure time, although progressive motility was significantly higher in the 50 min exposure group than the other groups (p<0.05). These results indicate that cryopreservation of dog sperm is feasible and yields more motile sperm following freezing and thawing in glycerol-free TRIS containing 0.3 M glucose with the exposure time for 50 min at $4^{\circ}C$.

개 정액 동결을 위한 glucose가 첨가된 glycerol-free TRIS 희석액을 개발하기 위해 glycerol-free TRIS내 알맞은 glucose의 양과 0.3 M glucose가 첨가된 glycerol-free TRIS내 정자의 적정 노출시간을 조사하였다. 여섯 마리의 수캐의 사출액을 0.04 M glucose가 첨가된 glycerol-free TRIS내에서 $4^{\circ}C$까지 100분 동안 냉각한 후 서로 다른 glucose농도 (0 M, 0,04 M, 0.1 M, 0.2 M, 0.3 M)의 glycerol-free TRIS에서 30분 동안 냉각하여 동결하였다. $37^{\circ}C$에서 25 초 동안 융해한 후 정자의 막 고유성과 첨단체 고유성을 검사하였다. 부가적으로 0.3 M glucose가 첨가된 glycerol-free TRIS내 정자의 적정 노출시간에 따른 정자의 동결 후 운동성, 생존성, DNA 고유성을 확인하였다. 막 고유성과 첨단체 고유성은 각각 6-carboxyfluoresceindiacetate(6-CFDA)/propidium iodide(PI) fluorescent staining와 Pisum sativum agglutinin conjugated-fluorescein isothiocyanate 방법에 의해 검사하였다. DNA 고유성은 terminal deoxynucleotidyl transferase dUTP nick end labeling로 염색하여 flow cytometry로 검사하였다. 0.2 M 또는 0.3 M glucose가 첨가된 glycerol-free TRIS에서 동결된 정자가 낮은 농도의 glucose가 첨가된 희석액에서 동결된 정자보다 막 고유성이 높게 나타났으며(p<0.05), 첨단체 고유성은 0.3 M 군에서 높게 나타났다(p<0.05). 운동성은 50 분 군에서 높게 나타났으나(p<0.05), DNA fragmentation index는 노출시간에 따라 차이가 없었다. 본 연구 결과 개정자가 0.3 M glucose가 첨가된 glycerol-free TRIS에서 $4^{\circ}C$, 50 분간 냉각 후 동결과 융해 후 더 높은 생존성을 나타냈다.

Keywords

References

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