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Adipocyte and Cell Biology

Adipose tissue microbiota in humans: an open issue

International Journal of Obesity volume 40, pages 1643–1648 (2016)Cite this article

Subjects

Abstract

Background:

A specific ‘adipose tissue’ microbiota has been recently identified in mice and hypothesized in humans. The purpose of this study was to verify the presence of microbiota of human whole adipose tissue and isolated adipocytes by combining culture-dependent and independent methods.

Methods:

Standard microbiological cultural techniques and 16S ribosomal RNA (16S rRNA) gene sequencing (Illumina technology) on DNA and RNA were employed to study (a) whole abdominal subcutaneous adipose tissue (SAT) and visceral adipose tissue (VAT) from 14 obese and five normal-weight subjects and (b) mature adipocytes isolated from SAT and VAT after collagenase digestion or mechanical separation. To optimize the 16S rRNA gene detection, we used different DNA extraction methods (lysis with proteinase K, proteinase K+lysozyme and microbeads) and amplification procedures (semi-quantitative standard PCR and real-time quantitative PCR).

Results:

Microbiological cultures were negative in all analyzed samples. In enzymatically isolated adipocytes, 90% of the sequenced bacterial DNA belonged to Clostridium histolyticum, the bacterium from which the collagenase enzyme was isolated. Bacterial 16S rRNA gene was not detected from DNA and RNA of whole SAT and VAT, as well as of mechanically isolated mature adipocytes, even after blocking with a specific primer the nonspecific amplification of human mitochondrial 12S rRNA.

Conclusions:

Our results do not support the presence of a human adipose tissue microbiota. In addition, they emphasized the technical problems encountered when applying metagenomic studies to human tissues with very low or absent bacterial load.

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Authors and Affiliations

  1. IRCCS Istituto Auxologico Italiano, Diabetes Research Laboratory, Milan, Italy

    A Zulian, R Cancello & C Invitti

  2. IRCCS Istituto Auxologico Italiano, Laboratory of Molecular Biology, Milan, Italy

    A Zulian, R Cancello & A M Di Blasio

  3. IRCCS Istituto Auxologico Italiano, Microbiology Laboratory, Milan, Italy

    E Cesana

  4. National Research Council, Institute for Biomedical Technologies, Segrate, Milan, Italy

    E Rizzi, C Consolandi & M Severgnini

  5. INCO and Department of General Surgery, Istituto Clinico Sant'Ambrogio, Milan, Italy

    V Panizzo

  6. Department of Pathophysiology and Transplantation University of Milan, INCO and Department of General Surgery, Istituto Clinico Sant'Ambrogio, Milan, Italy

    G Micheletto

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  1. A Zulian
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  2. R Cancello
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Correspondence to A Zulian.

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Zulian, A., Cancello, R., Cesana, E. et al. Adipose tissue microbiota in humans: an open issue. Int J Obes 40, 1643–1648 (2016). https://doi.org/10.1038/ijo.2016.111

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  • DOI: https://doi.org/10.1038/ijo.2016.111

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