title: Dietary (n-3) and (n-6) polyunsaturates and acetylsalicylic acid alter ex vivo PGE2 biosynthesis, tissue IGF-I levels, and bone morphometry in chicks.
abstract: This study examined the effects of dietary (n-6) and (n-3) polyunsaturated fatty acids (PUFA) and acetylsalicylic acid (ASA) on bone ash content, morphometry, fatty acid composition, ex vivo PGE2 biosynthesis, tissue IGF-I concentration, and serum alkaline phosphatase (ALPase) activity in chicks. Newly hatched chicks were fed a semipurified diet containing soybean oil (S) or menhaden oil / safflower oil (M) at 90 g/kg. At 4 days of age, chicks were divided into four equal treatment groups receiving 0 mg [symbol: see text] or 500 mg [symbol: see text] of ASA/kg of diet: S[symbol: see text]ASA, M[symbol: see text]ASA, S[symbol: see text]ASA, and M[symbol: see text]ASA. Lipid and ASA treatments did not affect bone length, bone ash, or bone mineral content in chicks. Chicks fed M had increased fractional labeled trabecular surface and tissue level bone formation rates, independent of ASA treatment, compared with those given S. A significant fat x ASA interaction effect was found for trabecular bone volume, thickness, separation, and number. Chicks fed S had higher 20:4(n-6) but lower 20:5(n-3) concentrations in liver and bone compared with those given M. Ex vivo PGE2 biosynthesis was higher in liver homogenates and bone organ cultures of chicks fed S compared with the values for those given M at 17 days. ASA treatment decreased ex vivo PGE2 production in liver homogenates and bone organ cultures of chicks, independent of the dietary lipids. Chicks fed ASA had a lower concentration of IGF-I in tibiotarsal bone compared with those not given ASA at 19 days. Serum ALPase activity was higher in chicks given M compared with those fed S, but the values were reversed with ASA feeding. This study demonstrated that both dietary fat and ASA modulated bone PGE2 biosynthesis, and that (n-3) PUFA and fat x ASA interactions altered bone morphometry.
authors.affiliation: Department of Food Science, Purdue University, West Lafayette, Indiana, USA.
authors.forename: B A
authors.initials: BA
authors.lastname: Watkins
authors.forename: C L
authors.initials: CL
authors.lastname: Shen
authors.forename: K G
authors.initials: KG
authors.lastname: Allen
authors.forename: M F
authors.initials: MF
authors.lastname: Seifert
mesh_terms: D000469:Alkaline Phosphatase / Q000097:blood; D000818:Animals; D001241:Aspirin / Q000494:pharmacology*; D001696:Biomechanical Phenomena; D015519:Bone Density / Q000187:drug effects; D001842:Bone and Bones / Q000187:drug effects / Q000378:metabolism; D002645:Chickens; D015232:Dinoprostone / Q000096:biosynthesis*; D005231:Fatty Acids, Unsaturated / Q000494:pharmacology*; D005395:Fish Oils / Q000008:administration & dosage; D007334:Insulin-Like Growth Factor I / Q000378:metabolism*; D008099:Liver / Q000187:drug effects / Q000378:metabolism; D008297:Male; D009924:Organ Culture Techniques; D012450:Safflower Oil / Q000008:administration & dosage; D013024:Soybean Oil / Q000008:administration & dosage
chemical_list: D005231:Fatty Acids, Unsaturated; D005395:Fish Oils; C033266:Menhaden oil; D007334:Insulin-Like Growth Factor I; D013024:Soybean Oil; D012450:Safflower Oil; D000469:Alkaline Phosphatase; D015232:Dinoprostone; D001241:Aspirin