Validation of merocyanine 540 staining as a technique for assessing capacitation-related membrane destabilization of fresh dog sperm

Theriogenology
D StecklerJ O Nöthling

Abstract

The aim of this study was to determine whether flow cytometric evaluation of combined merocyanine 540 and Yo-Pro 1 (M540-YP) staining would identify viable dog sperm that had undergone membrane stabilization known to be associated with capacitation in other species, and whether such destabilization is detected earlier than when using the tyrosine phosphorylation and ethidium homodimer (TP-EH) stain combination with epifluorescence microscopy. Semen from nine dogs was collected and incubated in parallel in bicarbonate-free modified Tyrode's medium (-BIC), medium containing 15 mM bicarbonate (+BIC), dog prostatic fluid, and in PBS. Aliquots for staining were removed at various time points during incubation of up to 6 hours. Staining with M540-YP allowed the classification of dog sperm as viable without destabilized membranes, viable with destabilized membranes, nonviable without destabilized membranes, or nonviable with destabilized membranes. The percentage of viable sperm detected using EH (83.5 ± 1.37%; mean ± SEM) was higher than when using YP (66.7 ± 1.37%: P < 0.05; n = 54 semen samples). On the other hand, M540-YP identified a higher percentage of viable sperm with destabilized membranes than TP-EH (75 ± 1.76% vs. 35 ± 1.7...Continue Reading

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Citations

Jan 26, 2017·Reproduction in Domestic Animals = Zuchthygiene·A Alcantar-Rodriguez, A Medrano
Sep 5, 2018·Reproduction in Domestic Animals = Zuchthygiene·Camila Arroyo-SalvoRicardo Felmer
Jun 28, 2021·Cell Biochemistry and Biophysics·Caroline Crespo da CostaIzabel Cristina Custódio de Souza

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