Preventing tumor progression to the bone by induced tumor-suppressing MSCs.
Theranostics
; 11(11): 5143-5159, 2021.
Article
em En
| MEDLINE
| ID: mdl-33859739
ABSTRACT
Background:
Advanced breast cancer metastasizes to many organs including bone, but few effective treatments are available. Here we report that induced tumor-suppressing (iTS) MSCs protected bone from metastases while un-induced MSCs did not.Methods:
iTS MSCs were generated by overexpressing Lrp5, ß-catenin, Snail, or Akt. Their tumor-suppressing capability was tested using a mouse model of mammary tumors and bone metastasis, human breast cancer tissues and cancer cell lines.Results:
In a mouse model, the induced MSC-derived conditioned medium (MSC CM) reduced mammary tumors and suppressed tumor-induced osteolysis. Tumor-promoting genes such as CXCL2 and LIF, as well as PDL1, a blocker of T-cell-based immune responses were downregulated. Proteomics analysis revealed that heat shock protein 90 (Hsp90ab1), calreticulin (Calr) and peptidylprolyl isomerase B (Ppib), which are highly expressed intracellular proteins in many cancers, were enriched in MSC CM as atypical tumor suppressors. Thus, overexpressing selected genes that were otherwise tumorigenic rendered MSCs the tumor-suppressing capability through the atypical suppressors, as well as p53 and Trail. Notably, the inhibitory effect of Lrp5- and Akt-overexpressing MSC CMs, Hsp90ab1 and Calr presented selective inhibition to tumor cells than non-tumor cells. The development of bone-resorbing osteoclasts was also suppressed by MSC CMs.Conclusion:
Collectively, the results showed an anti-tumor effect of iTS MSCs and suggested novel therapeutic approaches to suppress the progression of tumors into the bone.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Osso e Ossos
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Neoplasias Ósseas
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Células-Tronco Mesenquimais
Limite:
Animals
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Female
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Humans
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article