Effects of proteinase inhibitors on fertilization in sea lamprey (Petromyzon marinus).
A search for alternative sterilants in parasitic fish encouraged us to explore the usefulness of proteinase inhibitors for this purpose. Fertilization in sea lamprey species (Petromyzon marinus L.) was inhibited by chymotrypsin and trypsin inhibitors 4'-acetamidophenyl 4-guanidinobenzoate (AGB), chymostatin, tosyl-L-lysine chloromethyl ketone (TLCK), and N-tosyl-L-phenylalanine chloromethyl ketone (TPCK) when these substances were added into a fertilization medium at the time of fertilization. Preincubation of eggs before fertilization with 100 microM TPCK, but not TLCK, resulted in inhibition of fertilization. Conversely, preincubation of spermatozoa with TLCK, but not TPCK, produced inhibition of fertilization. These data suggest the involvement of the chymotrypsin-like activity of eggs and trypsin-like activity of spermatozoa in fertilization. However, enzymes present in sperm suspensions were able to hydrolyze a chymotrypsin substrate N-glutaryl-L-phenylalanine-p-nitroanilide (GPNA) but not trypsin substrate N-alpha-benzoyl-DL-arginine-p-nitroanilide (BAPNA). The nature of this activity can be characterized as serine protease and our results indicate the involvement of serine proteinases in the fertilization of sea lamprey.
School of Natural Resources, The Ohio State University, 210 Kottman Hall, 2021 Coffey Road, Columbus, OH 43210, USA. dabrowski.1@osu.edu
Konrad
K
Dabrowski
Jan
J
Glogowski
Andrzej
A
Ciereszko
D000818:Animals; D002918:Chymotrypsin / Q000037:antagonists & inhibitors; D005260:Female; D005306:Fertilization / Q000187:drug effects*; D008297:Male; D010063:Ovum / Q000187:drug effects / Q000201:enzymology; D048428:Petromyzon / Q000502:physiology*; D011480:Protease Inhibitors / Q000494:pharmacology*; D012697:Serine Endopeptidases; D013094:Spermatozoa / Q000187:drug effects / Q000201:enzymology; D014361:Trypsin Inhibitors / Q000494:pharmacology
D011480:Protease Inhibitors; D014361:Trypsin Inhibitors; D012697:Serine Endopeptidases; D002918:Chymotrypsin