Journal Article

Biomarkers of oxidative stress in saliva in pigs: analytical validation and changes in lactation

Mainau, Eva, Cerón, José Joaquín, Manteca, Xavier, Navarro, Elena, Rubio, Camila Peres, Contreras-Aguilar, Maria Dolores, Tecles, Fernando, Escribano, Damian, Martínez-Subiela, Silvia

2019

Overview

Background Biomarkers of oxidative stress in pigs have been measured in serum/plasma samples. However, blood collection in pigs can be highly stressful to the animals. Saliva is a biological fluid with several advantages in pigs over blood, since it can be easily collected without stress to the animals, being therefore an ideal sample in this species. The objective of this study was the validation of assays for the evaluation of oxidative stress status in saliva of pigs. For this purpose, three assays commonly used to evaluate the total antioxidant capacity (TAC): trolox equivalent antioxidant capacity (TEAC), cupric reducing antioxidant capacity (CUPRAC), and ferric reducing ability of plasma (FRAP)), one individual antioxidant (uric acid) and two assays to evaluate oxidant concentrations (advanced oxidation protein products (AOPP) and hydrogen peroxide (H 2 O 2 )) were measured and validated in porcine saliva. In addition, the possible changes of these assays in sows’ saliva during lactation were be studied. Results The methods had intra- and inter-assays coefficient of variation lower than 15%. They also showed an adequate linearity and recovery, and their detection limits were low enough to detect the analytes in saliva of pigs. Overall the analytical validation tests showed that the assays used in our study are valid and reliable for the evaluation of oxidative stress in porcine saliva. In addition, it was observed that these salivary biomarkers can change in a situation of oxidative stress such as lactation in sows. Conclusions All assays for salivary biomarkers of oxidative stress evaluated in this study have demonstrated a high analytical accuracy and low imprecision. In addition, it has been observed that these biomarkers showed significant changes in a situation of oxidative stress such as lactation in sows. Therefore, this study opens a new possibility of using saliva as a non-invasive sample to evaluate oxidative stress in pigs.

• Publisher: BioMed Central,BioMed Central Ltd,Springer Nature B.V,BMC
• Subject: advanced oxidation protein products / Advanced Oxidation Protein Products - analysis / Animals / Antioxidant / antioxidant activity / Antioxidants / Antioxidants (Nutrients) / Antioxidants - analysis / Biological markers / Biomarkers / Biomarkers - analysis / Blood banks / blood serum / chemical species / Clinical pathology / detection limit / Evaluation / Female / Hogs / Hydrogen peroxide / Hydrogen Peroxide - analysis / Identification and classification / Iron compounds / Lactation / Lactation - physiology / Medical examination / Medicine / Medicine & Public Health / Oxidant / oxidants / Oxidation / Oxidation-reduction reactions / Oxidative Stress / Peroxides / physiology and immunology / Plasma / Proteins / Purines / Reactive oxygen species / Research Article / Saliva / Saliva - chemistry / Sows / Sus scrofa - physiology / Swine / Transgenics / Uric acid / Uric Acid - analysis / Veterinary Medicine/Veterinary Science / Vitamin E / Zoology