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Flow cytometry를 이용하여 개 정자의 생존율 평가를 수행하고자 2-4세의 수캐 5두가 이용되었고, 분석을 위해 PI염색을 실시하였다. Flow cytometry를 이용한 개 신선 정액의 생존율 평가는 생존 정자와 죽은 정자의 비율을 1:0, 1:1, 1:3으로 조성하여 이를 flow cytometry로 평가하고 광학현미경검사, CFDA/PI 염색검사, HOS test에 의한 생존율과 비교하여 flow cytometry와의 상관관계를 알아보았다. 또한 개 정액을 동결하여 응해 후의 개 정자의 생존율 평가에도 동일한 방법으로 상관관계를 조사하였다. 신선 정액에서 생존 정자와 죽은 정자의 비율이 1:0, 1:1, 1:3 모든 경우에서 flow cytometry를 이용한 생존율은 HOS test에 의한 생존율과 높은 상관관계를 나타내었다 (p<0.01). 신선 정액에서 생존 정자와 죽은 정자의 비율이 1:0과 1:3일 때 광학현미경적 검사에 의한 생존율은 flow cytometry 분석에 의한 생존율과 유의 적인 상관관계를 나타내었으나 (p<0.05), 1:1 비율의 경우 상관관계를 보이지 않았다. 신선 정액에 생존 정자와 죽은 정자의 비율이 1:0과 1:1일 때 CFDA/PI 염색 검사에 의한 생존율은 flow cytometry분석에 의한 생존율과 높은 상관관계를 보였으며(p<0.01), 1:3 비율에서는 유의적인 상관관계를 보였다 (p<0.05). 동결 및 응해 후의 개 정자의 생존율 평가에서 HOS test 결과는 flow cytometry분석에 의한 생존율과 높은 상관관계를 보였으며 (p<0.01), 광학현미경적 검사를 통한 생존율은 유의적인 상관관계를 보였으나 (p<0.05), CFDA/PI 염색 검사결과는 상관관계를 보이지 않았다. 이상의 결과 flow cytometry는 신선정액 및 동결ㆍ융해 후 개 정자에 대한 생존율 검사에 정확한 평가 방법 인 것으로 판단되었다.
This study was performed to examine the correlations among dog sperm viabilities evaluated by flow cytometry, by microscopic evaluation (ME), by carbo-xifluorescein diacetate and propidium iodide (CFDA/PI) and by hypoosmotic swelling (HOS) test. Semen were collected from 5 dogs ranging in age from 2 to 4 years. Each ejaculate was divided into 3 aliquots and different proportions of freeze-killed cells were added to each aliquot (1:0, 1:1 and 1:3). In the other experiment, semen was extended with Sweden extender containing 5% glycerol and equex STM paste, and frozen using liquid nitrogen vapor. Fresh and frozen-thawed dog sperm viability were assessed by flow cytometry using PI staining method. The accuracy of flow cytometry was evaluated by comparing with other classic assessments, microscopic evaluation, epifluorescence microscopic analysis using CFDA/PI, and HOS test. High correlations of sperm viabilities were found among flow cytometry, epifluorescence evaluation, HOS test (p<0.01) in fresh semen. Especially, sperm viability assessed by HOS test was highly correlated with viability by flow cytometry in all the ratios of live and dead spermatozoa, 1:0, 1:1 and 1:3 (p<0.01). The viability evaluated by ME were significantly correlated with that by flow cytometry in ratios of 1:0 and 1:3 (p<0.05) however, there was no significance in ratio of 1:1. The viability evaluated by C/p were highly correlated with that by flow cytometry in ratio of 1:0 and 1:1 (p<0.01) and significantly correlated in ratio of 1:3 (p<0.05). In frozen-thawed spermatozoa, the viability determined by HOS test was considerably correlated with that by flow cytometry (p<0.01). There was significant correlation between the viabilities by ME and by flow cytometry (p<0.05). But the viability evaluated by CFDA/PI was not correlated with viability by flow cytometry. The result from this study validate the use of flow cytometry as a precise method for assessing the viability of fresh and frozen-thawed dog spermatozoa.
