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Goddio MV, Gattelli A, Tocci JM, Cuervo LP, Stedile M, Stumpo DJ, Hynes NE, Blackshear PJ, Meiss RP, Kordon EC. Expression of the mRNA stability regulator Tristetraprolin is required for lactation maintenance in the mouse mammary gland. Oncotarget 2018; 9:8278-8289. [PMID: 29492194 PMCID: PMC5823555 DOI: 10.18632/oncotarget.23904] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Accepted: 11/14/2017] [Indexed: 11/25/2022] Open
Abstract
Tristetraprolin (TTP), an mRNA-binding protein that negatively controls levels of inflammatory factors, is highly expressed in the lactating mouse mammary gland. To determine the biological relevance of this expression profile, we developed bi-transgenic mice in which this protein is specifically down-regulated in the secretory mammary epithelium in the secretory mammary epithelium during lactation. Our data show that TTP conditional KO mice produced underweight litters, possibly due to massive mammary cell death induced during lactation without the requirement of additional stimuli. This effect was linked to overexpression of inflammatory cytokines, activation of STAT3 and down-regulation of AKT phosphorylation. Importantly, blocking TNFα activity in the lactating conditional TTP KO mice inhibited cell death and similar effects were observed when this treatment was applied to wild-type animals during 48 h after weaning. Therefore, our results demonstrate that during lactation TTP wards off early involution by preventing the increase of local inflammatory factors. In addition, our data reveal the relevance of locally secreted TNFα for triggering programmed cell death after weaning.
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Affiliation(s)
- María Victoria Goddio
- IFIBYNE-UBA-CONICET, Departamento de Química Biológica, FCEN-UBA, Buenos Aires, Argentina
| | - Albana Gattelli
- IFIBYNE-UBA-CONICET, Departamento de Química Biológica, FCEN-UBA, Buenos Aires, Argentina
| | - Johanna M Tocci
- IFIBYNE-UBA-CONICET, Departamento de Química Biológica, FCEN-UBA, Buenos Aires, Argentina
| | - Lourdes Pérez Cuervo
- IFIBYNE-UBA-CONICET, Departamento de Química Biológica, FCEN-UBA, Buenos Aires, Argentina
| | - Micaela Stedile
- IFIBYNE-UBA-CONICET, Departamento de Química Biológica, FCEN-UBA, Buenos Aires, Argentina
| | - Deborah J Stumpo
- Signal Transduction Laboratory, National Institute of Environmental Health Sciences, Research Triangle Park, Durham, North Carolina, USA
| | - Nancy E Hynes
- Friedrich Miescher Institute for Biomedical Research, Basel, Switzerland
| | - Perry J Blackshear
- Signal Transduction Laboratory, National Institute of Environmental Health Sciences, Research Triangle Park, Durham, North Carolina, USA
| | | | - Edith C Kordon
- IFIBYNE-UBA-CONICET, Departamento de Química Biológica, FCEN-UBA, Buenos Aires, Argentina
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