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Knee osteoarthritis (OA)-related phenotypes of myeloid-derived suppressor cells (MDSCs) is mediated by infrapatellar fat pad (IPFP)-derived factors in a body mass (BMI)-dependent manner and positively correlates with IPFP-derived adiponectin levels

ABSTRACT: In osteoarthritis (OA), immune cells including myeloid-derived suppressor cells (MDSCs) infiltrate infrapatellar fat pad. MDSCs play a crucial role in immune suppression in cancer and autoimmunity, but their function change upon increasing of body mass index (BMI). However, role of MDSC in OA is less studied. Therefore, this study aimed to investigate the the effect of BMI on gene expression profile in MDSC from knee OA patients.

ORGANISM(S): Homo sapiens

PROVIDER: GSE292129 | GEO | 2026/04/15

REPOSITORIES: GEO

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Project description:Myeloid-derived suppressor cells (MDSCs) are immature myeloid cells that accumulate in the tumor microenvironment of most cancer patients. There MDSCs suppress both adaptive and innate immune responses, hindering immunotherapies. Moreover, many cancers are accompanied by inflammation, a processes that further intensifies MDSC suppressive activity, causing aggressive tumor progression and metastasis. MDSCs collected from tumor-bearing mice profusely release nano-scale membrane-bound extracellular vesicles, called exosomes, which carry biologically active proteins between cells and contribute directly to the immune suppressive functions of MDSC. Many studies on other cell types have shown that exosomes may also carry microRNAs (miRNAs) and messenger RNAs (mRNAs) which can also be transferred to surrounding and distant cells. However, to the best of our knowledge, the miRNA and mRNA cargo of MDSC-derived exosomes has not yet been interrogated. This study aims to identify and quantify the cargo of MDSC and their immunosuppressive exosomes to gather knowledge that can offer insights on the mechanisms by which MDSCs contribute to immune suppression, focusing on the role of exosomes as intercellular communication mediators in the tumor microenvironment. In order to achieve our objective a well-established mouse model based on a conventional mammary carcinoma (4T1 cells) and heightened inflammation (4T1 transduced to express the cytokine interleukin-1b) was used. We provide evidence that MDSC-derived exosomes carry proteins, mRNAs and miRNAs. Relative quantitation demonstrated quantitative differences between the exosome cargo and the cargo of their parental cells, supporting the hypothesis that selective loading into the exosomes is possible. Additionally, quantitative and functional analyses of the exosome cargo generated under conventional and heightened inflammation conditions are consistent with clinical observations that inflammation is linked to cancer development.

Dataset Information

Knee osteoarthritis (OA)-related phenotypes of myeloid-derived suppressor cells (MDSCs) is mediated by infrapatellar fat pad (IPFP)-derived factors in a body mass (BMI)-dependent manner and positively correlates with IPFP-derived adiponectin levels

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