The effect of the stage of lactation on blood redox homeostasis of bovine and buffalo cows was evaluated.The investigation was carried out on early lactating and mid-late lactating cows, reared in a farm locatedin Campania (southern Italy). Plasma concentration of ?-tocopherol and ascorbate, the total antioxidant capacity(TAC), glutathione peroxidase (GPx), and superoxide dismutase activities were higher (P < 0.01) in mid-late lactatingcows, thus suggesting a higher consumption of antioxidants during early lactation. Plasma concentration ofprotein-bound carbonyls (PC) and nitrotyrosine (N-Tyr), and the level of lipid hydroperoxides (LPO) were higher(P < 0.01) in early lactating cows, thus suggesting that lipid peroxidation and peroxynitrite production are crucialin determining oxidative modifications in plasma. TAC was positively correlated with ascorbate concentration(P < 0.03), and negatively correlated with PC concentration (P < 0.002), and ascorbate was negatively correlatedwith PC (P < 0.03) in mid-late lactating group. These findings demonstrate that circulating ascorbate plays a majorrole in preventing protein modifications induced by carbonyls, and that ascorbate scavenging effect is impairedduring early lactation. We calculated a protein oxidative stress index as the ratio (PC + N-Tyr)/TAC multipliedby 100, and we found that this parameter was higher (P < 0.0001) in early lactating cows. Therefore, it could beuseful for assessing the extent of protein oxidative damage in relation to the whole antioxidant status. Further,we suggest that the LPO/GPx ratio multiplied by 100 might be used as lipid oxidative stress index in lactatingcows. This index was higher (P < 0.0001) in early lactating cows, and might represent a standard parameter forevaluating the lipid damage depending on a deficiency of the enzymatic antioxidant defence. These parametersare proposed for a possible effective description of physiological changes associated with lactation.
Characterization of blood redox status of early and mid-late lactating dairy cows
M Strazzullo;C Rossetti;G Grazioli;G Auriemma;F Sarubbi;L Iannuzzi;MS Spagnuolo
2014
Abstract
The effect of the stage of lactation on blood redox homeostasis of bovine and buffalo cows was evaluated.The investigation was carried out on early lactating and mid-late lactating cows, reared in a farm locatedin Campania (southern Italy). Plasma concentration of ?-tocopherol and ascorbate, the total antioxidant capacity(TAC), glutathione peroxidase (GPx), and superoxide dismutase activities were higher (P < 0.01) in mid-late lactatingcows, thus suggesting a higher consumption of antioxidants during early lactation. Plasma concentration ofprotein-bound carbonyls (PC) and nitrotyrosine (N-Tyr), and the level of lipid hydroperoxides (LPO) were higher(P < 0.01) in early lactating cows, thus suggesting that lipid peroxidation and peroxynitrite production are crucialin determining oxidative modifications in plasma. TAC was positively correlated with ascorbate concentration(P < 0.03), and negatively correlated with PC concentration (P < 0.002), and ascorbate was negatively correlatedwith PC (P < 0.03) in mid-late lactating group. These findings demonstrate that circulating ascorbate plays a majorrole in preventing protein modifications induced by carbonyls, and that ascorbate scavenging effect is impairedduring early lactation. We calculated a protein oxidative stress index as the ratio (PC + N-Tyr)/TAC multipliedby 100, and we found that this parameter was higher (P < 0.0001) in early lactating cows. Therefore, it could beuseful for assessing the extent of protein oxidative damage in relation to the whole antioxidant status. Further,we suggest that the LPO/GPx ratio multiplied by 100 might be used as lipid oxidative stress index in lactatingcows. This index was higher (P < 0.0001) in early lactating cows, and might represent a standard parameter forevaluating the lipid damage depending on a deficiency of the enzymatic antioxidant defence. These parametersare proposed for a possible effective description of physiological changes associated with lactation.File | Dimensione | Formato | |
---|---|---|---|
prod_279835-doc_79167.pdf
solo utenti autorizzati
Descrizione: Characterization of blood redox status of early and mid-late lactating dairy cows
Licenza:
NON PUBBLICO - Accesso privato/ristretto
Dimensione
291.95 kB
Formato
Adobe PDF
|
291.95 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.