Abstract
Caveolae are small plasma membrane invaginations constituted for membrane proteins namely caveolins and cytosolic proteins termed cavins, which can occupy up to 50% of the surface of mammalian cells. The caveolae have been involved with a variety of cellular processes including regulation of cellular signaling. Insulin is a hormone that mediates a variety of physiological processes through activation of insulin receptor (IR), which is a tyrosine kinase receptor expressed in all mammalian tissues. Insulin induces activation of signal transducers and activators of transcription (STAT) family members including STAT5. In this study, we demonstrate, for the first time, that insulin induces phosphorylation of STAT5 at tyrosine-694 (STAT5-Tyr(P)694), STAT5 nuclear accumulation and an increase in STAT5-DNA complex formation in MCF-7 breast cancer cells. Insulin also induces nuclear accumulation of STAT5-Tyr(P)694, caveolin-1, and IR in MCF-7 cells. STAT5 nuclear accumulation and the increase of STAT5-DNA complex formation require the integrity of caveolae and microtubule network. Moreover, insulin induces an increase and nuclear accumulation of STAT5-Tyr(P)694 in MDA-MB-231 breast cancer cells. In conclusion, results demonstrate that caveolae and microtubule network play an important role in STAT5-Tyr(P)694, STAT5 nuclear accumulation and STAT5-DNA complex formation induced by insulin in breast cancer cells.
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The authors declare that all data supporting the findings of this study are available within the article.
Abbreviations
- Ab:
-
Antibody
- DMEM:
-
Dulbecco’s modified Eagle’s media
- DTT:
-
Dithiothreitol
- EDTA:
-
Ethylenediamine tetraacetic acid
- EGF:
-
Epidermal growth factor
- EGTA:
-
Ethylene glycol-bis-(2-aminoethyl ether)-N,N,N′,N′-tetraacetic acid
- EMSA:
-
Electrophoretic mobility shift assay
- FBS:
-
Fetal bovine serum
- HEPES:
-
4-(2-Hydroxyethyl) piperazine-1-ethanesulfonic acid
- IR:
-
Insulin receptor
- PBS:
-
Phosphate buffered saline
- PI3K:
-
Phosphatidylinositol 3-kinase
- PMSF:
-
Phenylmethylsulfonyl fluoride
- PTK:
-
Protein tyrosine kinase
- Rb:
-
Retinoblastoma
- RIPA:
-
Radioimmune precipitation assay
- SDS:
-
Sodium dodecyl sulfate
- STAT:
-
Signal transducer and activators of transcription
- STAT5-Tyr(P)694 :
-
STAT5 phosphorylation at Tyr-694
- Tyr:
-
Tyrosine
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Acknowledgements
We are grateful to Biol. Ivonne-Grisel Sanchez-Cervantes for her technical assistance in the analysis of imagens and to the Unidad de microscopia (Facultad de Medicina, UNAM).
Funding
This research was funded by a grant from CONACYT (255429). R C-S is supported by a CONACYT Post-Doctoral grant.
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Castillo-Sanchez, R., Cortes-Reynosa, P., Lopez-Perez, M. et al. Caveolae Microdomains Mediate STAT5 Signaling Induced by Insulin in MCF-7 Breast Cancer Cells. J Membrane Biol 256, 79–90 (2023). https://doi.org/10.1007/s00232-022-00253-x
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DOI: https://doi.org/10.1007/s00232-022-00253-x