Multi-omics in vitro study of the salivary modulation of the goat rumen microbiome.

Autor:	Palma-Hidalgo JM; Estación Experimental del Zaidín (CSIC), Profesor Albareda 1, 18008 Granada, Spain; Scotland's Rural College (SRUC), Peter Wilson Building King's Buildings, W Mains Rd, Edinburgh EH9 3JG, United Kingdom., Belanche A; Estación Experimental del Zaidín (CSIC), Profesor Albareda 1, 18008 Granada, Spain; Departamento de Producción Animal y Ciencia de los Alimentos, IA2, Universidad de Zaragoza, Miguel Servet 177, 50013 Zaragoza, Spain., Jiménez E; Estación Experimental del Zaidín (CSIC), Profesor Albareda 1, 18008 Granada, Spain., Newbold CJ; Scotland's Rural College (SRUC), Peter Wilson Building King's Buildings, W Mains Rd, Edinburgh EH9 3JG, United Kingdom., Denman SE; CSIRO Livestock Industries, Queensland Bioscience Precinct, St Lucia, Qld, Australia., Yáñez-Ruiz DR; Estación Experimental del Zaidín (CSIC), Profesor Albareda 1, 18008 Granada, Spain. Electronic address: david.yanez@eez.csic.es.
Jazyk:	angličtina
Zdroj:	Animal : an international journal of animal bioscience [Animal] 2023 Aug; Vol. 17 (8), pp. 100895. Date of Electronic Publication: 2023 Jul 04.
DOI:	10.1016/j.animal.2023.100895
Abstrakt:	Ruminants are able to produce large quantities of saliva which enter into the rumen and salivary components exert different physiological functions. Although previous research has indicated that salivary immunoglobulins can partially modulate the rumen microbial activity, the role of the salivary components other than ions on the rumen microbial ecosystem has not been thoroughly investigated in ruminants. To investigate this modulatory activity, a total of 16 semi-continuous in vitro cultures with oats hay and concentrate were used to incubate rumen fluid from four donor goats with autoclaved saliva (AUT) as negative control, saliva from the same rumen fluid donor (OWN) as positive control, and either goat (GOAT) or sheep (SHEEP) saliva as experimental interventions. Fermentation was monitored throughout 7 days of incubation and the microbiome and metabolome were analysed at the end of this incubation by Next-Generation sequencing and liquid chromatography coupled with mass spectrometry, respectively. Characterisation of the proteome and metabolome of the different salivas used for the incubation showed a high inter-animal variability in terms of metabolites and proteins, including immunoglobulins. Incubation with AUT saliva promoted lower fermentative activity in terms of gas production (-9.4%) and highly divergent prokaryotic community in comparison with other treatments (OWN, GOAT and SHEEP) suggesting a modulatory effect derived from the presence of bioactive salivary components. Microbial alpha-diversity at amplicon sequence variant (ASV) level was unaffected by treatment. However, some differences were found in the microbial communities across treatments, which were mostly caused by a greater abundance of Proteobacteria and Rikenellacea in the AUT treatment and lower of Prevotellaceae. These bacteria, which are key in the rumen metabolism, had greater abundances in GOAT and SHEEP treatments. Incubation with GOAT saliva led to a lower protozoal concentration and propionate molar proportion indicating a capacity to modulate the rumen microbial ecosystem. The metabolomics analysis showed that the AUT samples were clustered apart from the rest indicating different metabolic pathways were promoted in this treatment. These results suggest that specific salivary components contribute to host-associated role in selecting the rumen commensal microbiota and its activity. These findings could open the possibility of developing new strategies to modulate the saliva composition as a way to manipulate the rumen function and activity. (Copyright © 2023 The Author(s). Published by Elsevier B.V. All rights reserved.)
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu