Microbiota Reconstitution Does Not Cause Bone Loss in Germ-Free Mice

ABSTRACT Annually, an estimated 2 million osteoporotic fractures occur in the United States alone. Osteoporosis imparts a great burden on the health care system. The identification of novel regulators of bone health is critical for developing more effective therapeutics. A previous study on the colo...

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Autores principales:	Darin Quach, Fraser Collins, Narayanan Parameswaran, Laura McCabe, Robert A. Britton
Formato:	article
Lenguaje:	EN
Publicado:	American Society for Microbiology 2018
Materias:	bone microbiome microbiota osteoporosis Microbiology QR1-502
Acceso en línea:	https://doaj.org/article/576fefb36936468d886c4e459728949a
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spelling	oai:doaj.org-article:576fefb36936468d886c4e459728949a2021-11-15T15:22:01ZMicrobiota Reconstitution Does Not Cause Bone Loss in Germ-Free Mice10.1128/mSphereDirect.00545-172379-5042https://doaj.org/article/576fefb36936468d886c4e459728949a2018-02-01T00:00:00Zhttps://journals.asm.org/doi/10.1128/mSphereDirect.00545-17https://doaj.org/toc/2379-5042ABSTRACT Annually, an estimated 2 million osteoporotic fractures occur in the United States alone. Osteoporosis imparts a great burden on the health care system. The identification of novel regulators of bone health is critical for developing more effective therapeutics. A previous study on the colonization of germ-free (GF) mice with a microbial community has demonstrated that bacterial colonization dramatically increases bone loss. We therefore investigated the impact of multiple microbial communities in different mice to understand how generalizable the impact of bacterial colonization is on bone health. To investigate the impact of different microbial communities on bone health in outbred and inbred mouse strains, gavage was performed on GF Swiss Webster and GF C57BL/6 mice to introduce distinct microbiotas that originated from either humans or mice. GF mice displayed a high degree of colonization, as indicated by more than 90% of the operational taxonomic units present in the starting inoculum being successfully colonized in the mice when they were examined at the end of the experiment. In spite of the successful colonization of GF mice with gut microbiota of either mouse or human origin, bone mass did not change significantly in any of the groups tested. Furthermore, static and dynamic bone parameters and osteoclast precursor and T cell populations, as well as the expression of several inflammatory markers, were mostly unchanged following microbial colonization of GF mice. IMPORTANCE The microbiota has been shown to be an important regulator of health and development. With regard to its effect on bone health, a previous study has suggested that gut microbes negatively impact bone density. However, we show here that this is not generalizable to all microbial communities and mouse strain backgrounds. Our results demonstrate that colonization of mice, both outbred and inbred strains, did not have a major impact on bone health. The identification of microbial communities that do not negatively impact bone health may provide a foundation for future investigations that seek to identify microbes that are either beneficial or detrimental to bone metabolism.Darin QuachFraser CollinsNarayanan ParameswaranLaura McCabeRobert A. BrittonAmerican Society for MicrobiologyarticlebonemicrobiomemicrobiotaosteoporosisMicrobiologyQR1-502ENmSphere, Vol 3, Iss 1 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	bone microbiome microbiota osteoporosis Microbiology QR1-502
spellingShingle	bone microbiome microbiota osteoporosis Microbiology QR1-502 Darin Quach Fraser Collins Narayanan Parameswaran Laura McCabe Robert A. Britton Microbiota Reconstitution Does Not Cause Bone Loss in Germ-Free Mice
description	ABSTRACT Annually, an estimated 2 million osteoporotic fractures occur in the United States alone. Osteoporosis imparts a great burden on the health care system. The identification of novel regulators of bone health is critical for developing more effective therapeutics. A previous study on the colonization of germ-free (GF) mice with a microbial community has demonstrated that bacterial colonization dramatically increases bone loss. We therefore investigated the impact of multiple microbial communities in different mice to understand how generalizable the impact of bacterial colonization is on bone health. To investigate the impact of different microbial communities on bone health in outbred and inbred mouse strains, gavage was performed on GF Swiss Webster and GF C57BL/6 mice to introduce distinct microbiotas that originated from either humans or mice. GF mice displayed a high degree of colonization, as indicated by more than 90% of the operational taxonomic units present in the starting inoculum being successfully colonized in the mice when they were examined at the end of the experiment. In spite of the successful colonization of GF mice with gut microbiota of either mouse or human origin, bone mass did not change significantly in any of the groups tested. Furthermore, static and dynamic bone parameters and osteoclast precursor and T cell populations, as well as the expression of several inflammatory markers, were mostly unchanged following microbial colonization of GF mice. IMPORTANCE The microbiota has been shown to be an important regulator of health and development. With regard to its effect on bone health, a previous study has suggested that gut microbes negatively impact bone density. However, we show here that this is not generalizable to all microbial communities and mouse strain backgrounds. Our results demonstrate that colonization of mice, both outbred and inbred strains, did not have a major impact on bone health. The identification of microbial communities that do not negatively impact bone health may provide a foundation for future investigations that seek to identify microbes that are either beneficial or detrimental to bone metabolism.
format	article
author	Darin Quach Fraser Collins Narayanan Parameswaran Laura McCabe Robert A. Britton
author_facet	Darin Quach Fraser Collins Narayanan Parameswaran Laura McCabe Robert A. Britton
author_sort	Darin Quach
title	Microbiota Reconstitution Does Not Cause Bone Loss in Germ-Free Mice
title_short	Microbiota Reconstitution Does Not Cause Bone Loss in Germ-Free Mice
title_full	Microbiota Reconstitution Does Not Cause Bone Loss in Germ-Free Mice
title_fullStr	Microbiota Reconstitution Does Not Cause Bone Loss in Germ-Free Mice
title_full_unstemmed	Microbiota Reconstitution Does Not Cause Bone Loss in Germ-Free Mice
title_sort	microbiota reconstitution does not cause bone loss in germ-free mice
publisher	American Society for Microbiology
publishDate	2018
url	https://doaj.org/article/576fefb36936468d886c4e459728949a
work_keys_str_mv	AT darinquach microbiotareconstitutiondoesnotcausebonelossingermfreemice AT frasercollins microbiotareconstitutiondoesnotcausebonelossingermfreemice AT narayananparameswaran microbiotareconstitutiondoesnotcausebonelossingermfreemice AT lauramccabe microbiotareconstitutiondoesnotcausebonelossingermfreemice AT robertabritton microbiotareconstitutiondoesnotcausebonelossingermfreemice
_version_	1718428071200030720

Microbiota Reconstitution Does Not Cause Bone Loss in Germ-Free Mice

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