|
1
|
Blitz SE, Kappel AD, Gessler FA, Klinger NV, Arnaout O, Lu Y, Peruzzi PP, Smith TR, Chiocca EA, Friedman GK, Bernstock JD. Tumor-Associated Macrophages/Microglia in Glioblastoma Oncolytic Virotherapy: A Double-Edged Sword. Int J Mol Sci 2022; 23:ijms23031808. [PMID: 35163730 PMCID: PMC8836356 DOI: 10.3390/ijms23031808] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2022] [Revised: 01/29/2022] [Accepted: 02/01/2022] [Indexed: 02/06/2023] Open
Abstract
Oncolytic virotherapy is a rapidly progressing field that uses oncolytic viruses (OVs) to selectively infect malignant cells and cause an antitumor response through direct oncolysis and stimulation of the immune system. Despite demonstrated pre-clinical efficacy of OVs in many cancer types and some favorable clinical results in glioblastoma (GBM) trials, durable increases in overall survival have remained elusive. Recent evidence has emerged that tumor-associated macrophage/microglia (TAM) involvement is likely an important factor contributing to OV treatment failure. It is prudent to note that the relationship between TAMs and OV therapy failures is complex. Canonically activated TAMs (i.e., M1) drive an antitumor response while also inhibiting OV replication and spread. Meanwhile, M2 activated TAMs facilitate an immunosuppressive microenvironment thereby indirectly promoting tumor growth. In this focused review, we discuss the complicated interplay between TAMs and OV therapies in GBM. We review past studies that aimed to maximize effectiveness through immune system modulation-both immunostimulatory and immunosuppressant-and suggest future directions to maximize OV efficacy.
Collapse
Affiliation(s)
- Sarah E. Blitz
- Harvard Medical School, Boston, MA 02115, USA; (S.E.B.); (A.D.K.); (N.V.K); (O.A.); (Y.L.); (P.P.P.); (T.R.S.); (E.A.C.)
| | - Ari D. Kappel
- Harvard Medical School, Boston, MA 02115, USA; (S.E.B.); (A.D.K.); (N.V.K); (O.A.); (Y.L.); (P.P.P.); (T.R.S.); (E.A.C.)
- Department of Neurosurgery, Brigham and Women’s Hospital, Boston, MA 02115, USA
| | - Florian A. Gessler
- Department of Neurosurgery, University Medicine Rostock, 18057 Rostock, Germany;
| | - Neil V. Klinger
- Harvard Medical School, Boston, MA 02115, USA; (S.E.B.); (A.D.K.); (N.V.K); (O.A.); (Y.L.); (P.P.P.); (T.R.S.); (E.A.C.)
- Department of Neurosurgery, Brigham and Women’s Hospital, Boston, MA 02115, USA
| | - Omar Arnaout
- Harvard Medical School, Boston, MA 02115, USA; (S.E.B.); (A.D.K.); (N.V.K); (O.A.); (Y.L.); (P.P.P.); (T.R.S.); (E.A.C.)
- Department of Neurosurgery, Brigham and Women’s Hospital, Boston, MA 02115, USA
| | - Yi Lu
- Harvard Medical School, Boston, MA 02115, USA; (S.E.B.); (A.D.K.); (N.V.K); (O.A.); (Y.L.); (P.P.P.); (T.R.S.); (E.A.C.)
- Department of Neurosurgery, Brigham and Women’s Hospital, Boston, MA 02115, USA
| | - Pier Paolo Peruzzi
- Harvard Medical School, Boston, MA 02115, USA; (S.E.B.); (A.D.K.); (N.V.K); (O.A.); (Y.L.); (P.P.P.); (T.R.S.); (E.A.C.)
- Department of Neurosurgery, Brigham and Women’s Hospital, Boston, MA 02115, USA
| | - Timothy R. Smith
- Harvard Medical School, Boston, MA 02115, USA; (S.E.B.); (A.D.K.); (N.V.K); (O.A.); (Y.L.); (P.P.P.); (T.R.S.); (E.A.C.)
- Department of Neurosurgery, Brigham and Women’s Hospital, Boston, MA 02115, USA
| | - Ennio A. Chiocca
- Harvard Medical School, Boston, MA 02115, USA; (S.E.B.); (A.D.K.); (N.V.K); (O.A.); (Y.L.); (P.P.P.); (T.R.S.); (E.A.C.)
- Department of Neurosurgery, Brigham and Women’s Hospital, Boston, MA 02115, USA
| | - Gregory K. Friedman
- Department of Pediatrics, University of Alabama at Birmingham, Birmingham, AL 35294, USA;
| | - Joshua D. Bernstock
- Harvard Medical School, Boston, MA 02115, USA; (S.E.B.); (A.D.K.); (N.V.K); (O.A.); (Y.L.); (P.P.P.); (T.R.S.); (E.A.C.)
- Department of Neurosurgery, Brigham and Women’s Hospital, Boston, MA 02115, USA
- Correspondence:
| |
Collapse
|