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Senescence associated secretory phenotype profile from primary lung mice fibroblasts depends on the senescence induction stimuli

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Abstract

Cellular senescence is a multifactorial phenomenon of growth arrest and distorted function, which has been recognized as an important feature during tumor suppression mechanisms and a contributor to aging. Senescent cells have an altered secretion pattern called Senescence-Associated Secretory Phenotype (SASP) that comprises a complex mix of factors including cytokines, growth factors, chemokines, and matrix metalloproteinases. SASP has been related with local inflammation that leads to cellular transformation and neurodegenerative diseases. Various pathways for senescence induction have been proposed; the most studied is replicative senescence due to telomere attrition called replicative senescence (RS). However, senescence can be prematurely achieved when cells are exposed to diverse stimuli such as oxidative stress (stress-induced premature senescence, SIPS) or proteasome inhibition (proteasome inhibition-induced premature senescence, PIIPS). SASP has been characterized in RS and SIPS but not in PIIPS. Hence, our aim was to determine SASP components in primary lung fibroblasts obtained from CD-1 mice induced to senescence by PIIPS and compare them to RS and SIPS. Our results showed important variations in the 62 cytokines analyzed, while SIPS and RS showed an increase in the secretion of most cytokines, and in PIIPS only 13 were incremented. Variations in glutathione-redox balance were also observed in SIPS and RS, and not in PIIPS. All senescence types SASP displayed a pro-inflammatory profile and increased proliferation in L929 mice fibroblasts exposed to SASP. However, the behavior observed was not exactly the same, suggesting that the senescence induction pathway might encompass dissimilar responses in adjacent cells and promote different outcomes.

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Acknowledgments

The authors would like to thank Dr. Rocío González-Vieira from UAM-I for animal supply; we also thank the CBS-UAMI Confocal Core for confocal image acquisition and analysis. This work was supported by CONACyT’s grant CB-2012-1-178349 as well as the “Red Temática de Envejecimiento, Salud y Desarrollo Social” from CONACyT and INGER DI-PI004/2012. In addition this work was supported by grants 1RO1NS078283, R21AG046943 and the Commonwealth of Pennsylvania Universal Research Enhancement Grant awarded to C.Torres. LA Maciel-Barón and SL Morales-Rosales are CONACyT scholarship holders.

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Correspondence to Mina Königsberg.

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L. A. Maciel-Barón Posgrado en Biología Experimental, UAMI.

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S. Figure 1

Close-up for p16 and β-galactosidase. Close-up for unmerged images. a Control (day 9), b RS (day 21), c PIIPS (day 15), and d SIPS (day 15) cells. p16 is stained in green, DAPI in blue, and β-galactosidase in red. (PPTX 2038 kb)

S. Figure 2

Membranes used for SASP analysis. The components present in the SASP secreted by the different senescent-induced cells were analyzed and compared at selected time points for each kind of senescence (day 15 for SIPS and PIIPS, day 21 for RS, and day 9 for control non-senescent cells). MEM supplemented medium was changed to MCDB105-free serum (Conditioned Media, CM), and cells were incubated for 48 h. After that time, CM was recovered and frozen at −80 °C for further analysis. The figure shows representative membranes from the kit that where incubated with 1 mL of 10-fold concentrate CM from the different senescent-induced cells. The spots marked in a red box are the positive controls. The other boxes show some representative cytokines that are discussed in the text: IL-6 (green), IL1a (yellow), and IL12 (blue). (PPTX 2038 kb)

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Maciel-Barón, L.A., Morales-Rosales, S.L., Aquino-Cruz, A.A. et al. Senescence associated secretory phenotype profile from primary lung mice fibroblasts depends on the senescence induction stimuli. AGE 38, 26 (2016). https://doi.org/10.1007/s11357-016-9886-1

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  • DOI: https://doi.org/10.1007/s11357-016-9886-1

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