Abstract
Background
Triple negative breast cancer (TNBC) is characterized by invasiveness and short survival. Identifying novel TNBC-targeted therapies, to potentiate standard of care (SOC) therapy, is an unmet need. Progranulin (PGRN/GP88) is a biological driver of tumorigenesis, survival, and drug resistance in several cancers including breast cancer (BC). PGRN/GP88 tissue expression is an independent prognostic factor of recurrence while elevated serum PGRN/GP88 level is associated with poor outcomes. Since PGRN/GP88 expression is elevated in 30% TNBC, we investigated the involvement of progranulin on TNBC.
Methods
The effect of inhibiting PGRN/GP88 expression in TNBC cells by siRNA was investigated. The effects of a neutralizing anti-human PGRN/GP88 monoclonal antibody AG01 on the proliferation and migration of two TNBC cell lines expressing PGRN/GP88 were then examined in vitro and in vivo.
Results
Inhibition of GP88 expression by siRNA and AG01 treatment to block PGRN/GP88 action reduced proliferation and migration in a dose-dependent fashion in MDA-MB-231 and HS578-T cells. Western blot analysis showed decreased expression of phosphorylated protein kinases p-Src, p-AKT, and p-ERK upon AG01 treatment, as well as inhibition of tumor growth and Ki67 expression in vivo.
Conclusion
PGRN/GP88 represents a therapeutic target with companion diagnostics. Blocking PGRN/GP88 with antibody treatment may provide novel-targeted solutions in TNBC treatment which could eventually address the issue of toxicity and unresponsiveness associated with SOC.
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Data availability
The data used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- AG01:
-
Anti-progranulin antibody
- Akt:
-
Protein kinase B
- BC:
-
Breast cancer
- DAB:
-
3,3′-Diaminobenzidine
- DMEM:
-
Dulbecco’s Modified Eagle Medium
- ECL:
-
Enhanced chemiluminescence
- E-Cadherin:
-
Epithelial cadherin
- EDTA:
-
Ethylenediaminetetraacetic acid
- ERK1/2:
-
Extracellular signal-regulated protein kinases 1 and 2
- FAK:
-
Focal adhesion kinase
- FBS:
-
Fetal bovine serum
- GRN:
-
Granulin
- H&E:
-
Hematoxylin eosin
- HGFR/c-Met-:
-
Hepatocyte growth factor receptor
- HIF-1α:
-
Hypoxia-inducible factors-1α
- HO-1/HMOX1:
-
Heme oxygenase
- HRP:
-
Horse radish peroxide
- IACUC:
-
Institutional Animal Care and Use Committee
- ICAM-1/CD54:
-
Intercellular Adhesion Molecule 1
- IgG-Fc:
-
Immunoglobulin Fc region
- MAPK:
-
Mitogen-activated protein kinase
- MMP-2:
-
Metalloprotease-2
- PBS:
-
Phosphate buffer saline
- PGRN/GP88:
-
Progranulin, GP88
- PVDF:
-
Polyvinylidene fluoride
- R.T.:
-
Room temperature
- SD:
-
Standard deviation
- SEM:
-
Standard error of the mean
- SDS:
-
Sodium dodecyl sulfate
- SDS-PAGE:
-
Sodium dodecyl sulfate polyacrylamide gel electrophoresis
- SiRNA:
-
Silencing RNA
- SOC:
-
Standard of care
- TBST:
-
Tris-buffered saline
- TNBC:
-
Triple negative breast cancer
- TBST:
-
Tris-buffered saline with Tween-20
- TMB:
-
3,3′,5,5′-Tetramethylbenzidine
- TNFR2:
-
Tumor necrosis factor receptor-2
- V t/V o :
-
Tumor volume on Day t over tumor volume on Day 0
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Acknowledgements
We thank Dr. William S. Twaddell (School of Medicine, University of Maryland, Baltimore) for assisting in animal tumor section evaluation and Dr. Young Suk Lee (University of Maryland, Baltimore) for her review and suggestions on animal data. We also thank Drs. Rena Lapidus, Antonino Passaniti and Amy Fulton (School of Medicine, University of Maryland, Baltimore) for their suggestions and kind review of the manuscript. This work was supported by grant R44 CA 224718 from the National Cancer Institute to GS.
Funding
This work was supported by grant R44 CA 224718 from the National Cancer Institute to Ginette Serrero’s laboratory.
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Ginette Serrero and Rupa Guha planned, performed, and analyzed the experimental results, perform data analysis and were primarily responsible for writing and revising the manuscript. Binbin Yue prepared the reagents and carried out the progranulin analysis by ELISA and assisted in performing the animal studies. Jianping Dong assisted in performing the animal studies and the analysis of the in vivo data. Aditi Baneerjee assisted in analyzing the Ki67 stained and HE stained tumor sections for mitotic index, microvessel count. All authors agreed to the submission of the manuscript and its revision.
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Binbin Yue, Jianping Dong, and Ginette Serrero are employees of A&G Pharmaceutical. Rupa Guha and Aditi Banerjee have no conflicts to declare.
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Guha, R., Yue, B., Dong, J. et al. Anti-progranulin/GP88 antibody AG01 inhibits triple negative breast cancer cell proliferation and migration. Breast Cancer Res Treat (2021). https://doi.org/10.1007/s10549-021-06120-y
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Keywords
- Progranulin/GP88
- Triple negative breast cancer
- Proliferation
- Migration
- Ki67
- Anti-progranulin antibody
- Progranulin SiRNA