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. 2020 Sep 30;8:575126. doi: 10.3389/fcell.2020.575126

FIGURE 5.

FIGURE 5

Distribution of SPINK3 on capacitated and non-capacitated sperm. (A) Caudal sperm were incubated in non-capacitating (NC) or capacitating (CAP) conditions and then treated with recombinant SPINK3 (13 μM, “exogenous SPINK3”) for 15 min, washed and fixed. As a control of BSA blocking effect, a NC + BSA condition was included. SPINK3 was immunodetected as detailed in Methods. (B) Sperm recovered from the uterus of synchronized females immediately after coitus or from the male epididymis (negative control of cells that were not in contact with seminal vesicle secretions) were fixed. Then, native SPINK3 (“endogenous SPINK3”) was immunodetected. For (A,B) left panel shows representative pseudocolor images and bright fields (BF), and right panel shows percentage of positive immunoreactive cells. Scale bar = 10 μM.