title: Characterization of functional variables in epididymal alpaca (Vicugna pacos) sperm using imaging flow cytometry.
abstract: Epididymal alpaca sperm represent an alternative model for the study of alpaca semen. The objective of this study was to characterize the normal values of some functional variables in epididymal alpaca sperm using imaging flow cytometry. Alpaca testicles (n=150) were processed and sperm were recovered from the cauda epididymides. Only 76 samples with acceptable motility and sperm count were considered for assessment by imaging flow cytometry. Acrosome integrity and integrity/viability were assessed by FITC-PSA/PI and FITC-PNA/PI. Mitochondrial membrane potential (MMP) was assessed by MitoTracker CMXRos and MitoTracker Deep Red FM. Lipid peroxidation was evaluated using BODIPY 581/591 C11. Results show that the mean values for acrosome-intact sperm were 95.03±6.39% and 93.34±7.96%, using FITC-PSA and FITC-PNA, respectively. The mean values for acrosome-intact viable sperm were 60.58±12.12% with FITC-PSA/PI and 58.81±12.94% with FITC-PNA/PI. Greater MMP was detected in 65.03±15.92% and 59.52±19.19%, using MitoTracker CMXRos and MitoTracker Deep Red FM, respectively. Lipid peroxidation was 0.84±0.95%. Evaluation of acrosome-intact and acrosome-intact viable sperm with FITC-PSA/PI compared with. FITC-PNA/PI or MMP with MitoTracker CMXRos compared with MitoTracker Deep Red FM were correlated (P<0.05). The MMP using MitoTracker CMXRos was the only variable correlated (P<0.05) with sperm motility (r=0.3979). This report provides a basis for future research related to alpaca semen using the epididymal sperm model.
authors: Laboratory of Animal Reproduction, Faculty of Veterinary Medicine, Universidad Nacional Mayor de San Marcos (UNMSM), 2800 Circunvalación Av., Lima 41, Peru; Laboratory of Reproductive and Cellular Biotechnologies, Faculty of Veterinary and Biological Sciences, Universidad Científica del Sur (UCSUR), Panamericana Sur Km. 19, Lima 42, Peru. Electronic address: asantiani@hotmail.com.
authors: Alexei
authors: A
authors: Santiani
authors: Laboratory of Reproductive and Cellular Biotechnologies, Faculty of Veterinary and Biological Sciences, Universidad Científica del Sur (UCSUR), Panamericana Sur Km. 19, Lima 42, Peru.
authors: Alejandra
authors: A
authors: Ugarelli
authors: Laboratory of Reproductive and Cellular Biotechnologies, Faculty of Veterinary and Biological Sciences, Universidad Científica del Sur (UCSUR), Panamericana Sur Km. 19, Lima 42, Peru.
authors: Shirley
authors: S
authors: Evangelista-Vargas
mesh_terms: D000177:Acrosome / Q000502:physiology; D000818:Animals; D002161:Camelids, New World / Q000502:physiology*; D004822:Epididymis / Q000502:physiology*; D005434:Flow Cytometry / Q000379:methods / Q000662:veterinary*; D019044:Image Cytometry / Q000379:methods / Q000662:veterinary*; D008297:Male; D053078:Membrane Potential, Mitochondrial; D013094:Spermatozoa / Q000502:physiology*; D013194:Staining and Labeling
keywords: Acrosome integrity; Epididymal sperm; Flow cytometry; Lipid peroxidation; Mitochondrial membrane potential; Vicugna pacos