Influence of whey and purified whey proteins on neutrophil functions in sheep.
The effects of ruminant whey and its purified fractions on neutrophil chemotaxis and superoxide production in sheep were studied. Both colostral whey and milk whey were found to inhibit chemotaxis regardless of whether they were autologous or homologous, but the inhibitory effects were abolished by washing neutrophils with culture medium before their use in the chemotaxis assay. Colostral whey and milk whey also inhibited the chemotactic activity of zymosan-activated serum. Whey fractions of various degrees of purity such as lactoferrin, lactoperoxidase, lactoferrin-lactoperoxidase, alpha-lactalbumin, bovine serum albumin and whey protein concentrate were then studied. While none of these proteins showed any effects on chemotaxis, lactoferrin-lactoperoxidase and whey protein concentrate were found to have an enhancing effect on superoxide production in a dose-dependent manner. Our results provide information on the modulatory role of ruminant milk proteins in inflammatory responses and warrant future investigation.
Wong
C W
CW
CSIRO Division of Animal Health, Armidale, NSW, Australia.
Liu
A H
AH
Regester
G O
GO
Francis
G L
GL
Watson
D L
DL
D000818:Animals; D002417:Cattle; D002448:Cell Adhesion / Q000502:physiology; D002634:Chemotaxis, Leukocyte / Q000187:drug effects / Q000502:physiology; D003126:Colostrum / Q000737:chemistry; D004305:Dose-Response Relationship, Drug; D004730:Endothelium, Vascular / Q000166:cytology; D005109:Extracellular Matrix / Q000502:physiology; D005260:Female; D016209:Interleukin-8 / Q000494:pharmacology; D007768:Lactalbumin / Q000032:analysis; D007781:Lactoferrin / Q000032:analysis; D007784:Lactoperoxidase / Q000032:analysis; D008297:Male; D008892:Milk / Q000737:chemistry; D008894:Milk Proteins / Q000302:isolation & purification / Q000494:pharmacology*; D009504:Neutrophils / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology; D012710:Serum Albumin, Bovine / Q000032:analysis; D012756:Sheep / Q000097:blood / Q000378:metabolism / Q000502:physiology*; D013481:Superoxides / Q000378:metabolism; D000067816:Whey Proteins
D016209:Interleukin-8; D008894:Milk Proteins; D000067816:Whey Proteins; D013481:Superoxides; D012710:Serum Albumin, Bovine; D007768:Lactalbumin; D007784:Lactoperoxidase; D007781:Lactoferrin