Changes in the tumor microenvironment and outcome for TME-targeting therapy in glioblastoma: A pilot study

Sehar Ali, Thaiz Ferraz Borin, Raziye Piranlioglu, Roxan Ara, Iryna Oleksandrivna Lebedyeva, Kartik Angara, Bhagelu Ram Achyut, Ali Syed Arbab, Mohammad H. Rashid

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13 Scopus citations


Glioblastoma (GBM) is a hypervascular and aggressive primary malignant tumor of the central nervous system. Recent investigations showed that traditional therapies along with antiangiogenic therapies failed due to the development of post-therapy resistance and recurrence. Previous investigations showed that there were changes in the cellular and metabolic compositions in the tumor microenvironment (TME). It can be said that tumor cell-directed therapies are ineffective and rethinking is needed how to treat GBM. It is hypothesized that the composition of TME-associated cells will be different based on the therapy and therapeutic agents, and TME-targeting therapy will be better to decrease recurrence and improve survival. Therefore, the purpose of this study is to determine the changes in the TME in respect of T-cell population, M1 and M2 macrophage polarization status, and MDSC population following different treatments in a syngeneic model of GBM. In addition to these parameters, tumor growth and survival were also studied following different treatments. The results showed that changes in the TME-associated cells were dependent on the therapeutic agents, and the TME-targeting therapy improved the survival of the GBM bearing animals. The current GBM therapies should be revisited to add agents to prevent the accumulation of bone marrow-derived cells in the TME or to prevent the effect of immune-suppressive myeloid cells in causing alternative neovascularization, the revival of glioma stem cells, and recurrence. Instead of concurrent therapy, a sequential strategy would be better to target TME-associated cells.

Original languageEnglish (US)
Article numbere0246646
JournalPloS one
Issue number2 February
StatePublished - Feb 2021

ASJC Scopus subject areas

  • General


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