Cargando…

Unexpected severe consequences of Pikfyve deletion by aP2‐ or Aq‐promoter‐driven Cre expression for glucose homeostasis and mammary gland development

Systemic deficiency of PIKfyve, the evolutionarily conserved phosphoinositide kinase synthesizing cellular PtdIns5P and PtdIns(3,5)P(2) and implicated in insulin signaling, causes early embryonic death in mice. In contrast, mice with muscle‐specific Pikfyve disruption have normal lifespan but exhibi...

Descripción completa

Detalles Bibliográficos
Autores principales: Ikonomov, Ognian C., Sbrissa, Diego, Delvecchio, Khortnal, A. Rillema, James, Shisheva, Assia
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4908490/
https://www.ncbi.nlm.nih.gov/pubmed/27273882
http://dx.doi.org/10.14814/phy2.12812
_version_ 1782437690052968448
author Ikonomov, Ognian C.
Sbrissa, Diego
Delvecchio, Khortnal
A. Rillema, James
Shisheva, Assia
author_facet Ikonomov, Ognian C.
Sbrissa, Diego
Delvecchio, Khortnal
A. Rillema, James
Shisheva, Assia
author_sort Ikonomov, Ognian C.
collection PubMed
description Systemic deficiency of PIKfyve, the evolutionarily conserved phosphoinositide kinase synthesizing cellular PtdIns5P and PtdIns(3,5)P(2) and implicated in insulin signaling, causes early embryonic death in mice. In contrast, mice with muscle‐specific Pikfyve disruption have normal lifespan but exhibit early‐age whole‐body glucose intolerance and muscle insulin resistance, thus establishing the key role of muscle PIKfyve in glucose homeostasis. Fat and muscle tissues control postprandial glucose clearance through different mechanisms, raising questions as to whether adipose Pikfyve disruption will also trigger whole‐body metabolic abnormalities, and if so, what the mechanism might be. To clarify these issues, here we have characterized two new mouse models with adipose tissue disruption of Pikfyve through Cre recombinase expression driven by adipose‐specific aP2‐ or adiponectin (Aq) promoters. Whereas both mouse lines were ostensibly normal until adulthood, their glucose homeostasis and systemic insulin sensitivity were severely dysregulated. These abnormalities stemmed in part from accelerated fat‐cell lipolysis and elevated serum FFA. Intriguingly, aP2‐Cre‐PIKfyve(fl/fl) but not Aq‐Cre‐PIKfyve(fl/fl) females had severely impaired pregnancy‐induced mammary gland differentiation and lactogenesis, consistent with aP2‐Cre‐mediated Pikfyve excision in nonadipogenic tissues underlying this defect. Intriguingly, whereas mammary glands from postpartum control and Aq‐Cre‐PIKfyve(fl/fl) mice or ex vivo mammary gland explants showed profound upregulation of PIKfyve protein levels subsequent to prolactin receptor activation, such increases were not apparent in aP2‐Cre‐PIKfyve(fl/fl) females. Collectively, our data identify for the first time that adipose tissue Pikfyve plays a key role in the mechanisms regulating glucose homeostasis and that the PIKfyve pathway is critical in mammary epithelial differentiation during pregnancy and lactogenesis downstream of prolactin receptor signaling.
format Online
Article
Text
id pubmed-4908490
institution National Center for Biotechnology Information
language English
publishDate 2016
publisher John Wiley and Sons Inc.
record_format MEDLINE/PubMed
spelling pubmed-49084902016-06-17 Unexpected severe consequences of Pikfyve deletion by aP2‐ or Aq‐promoter‐driven Cre expression for glucose homeostasis and mammary gland development Ikonomov, Ognian C. Sbrissa, Diego Delvecchio, Khortnal A. Rillema, James Shisheva, Assia Physiol Rep Original Research Systemic deficiency of PIKfyve, the evolutionarily conserved phosphoinositide kinase synthesizing cellular PtdIns5P and PtdIns(3,5)P(2) and implicated in insulin signaling, causes early embryonic death in mice. In contrast, mice with muscle‐specific Pikfyve disruption have normal lifespan but exhibit early‐age whole‐body glucose intolerance and muscle insulin resistance, thus establishing the key role of muscle PIKfyve in glucose homeostasis. Fat and muscle tissues control postprandial glucose clearance through different mechanisms, raising questions as to whether adipose Pikfyve disruption will also trigger whole‐body metabolic abnormalities, and if so, what the mechanism might be. To clarify these issues, here we have characterized two new mouse models with adipose tissue disruption of Pikfyve through Cre recombinase expression driven by adipose‐specific aP2‐ or adiponectin (Aq) promoters. Whereas both mouse lines were ostensibly normal until adulthood, their glucose homeostasis and systemic insulin sensitivity were severely dysregulated. These abnormalities stemmed in part from accelerated fat‐cell lipolysis and elevated serum FFA. Intriguingly, aP2‐Cre‐PIKfyve(fl/fl) but not Aq‐Cre‐PIKfyve(fl/fl) females had severely impaired pregnancy‐induced mammary gland differentiation and lactogenesis, consistent with aP2‐Cre‐mediated Pikfyve excision in nonadipogenic tissues underlying this defect. Intriguingly, whereas mammary glands from postpartum control and Aq‐Cre‐PIKfyve(fl/fl) mice or ex vivo mammary gland explants showed profound upregulation of PIKfyve protein levels subsequent to prolactin receptor activation, such increases were not apparent in aP2‐Cre‐PIKfyve(fl/fl) females. Collectively, our data identify for the first time that adipose tissue Pikfyve plays a key role in the mechanisms regulating glucose homeostasis and that the PIKfyve pathway is critical in mammary epithelial differentiation during pregnancy and lactogenesis downstream of prolactin receptor signaling. John Wiley and Sons Inc. 2016-06-07 /pmc/articles/PMC4908490/ /pubmed/27273882 http://dx.doi.org/10.14814/phy2.12812 Text en © 2016 The Authors. Physiological Reports published by Wiley Periodicals, Inc. on behalf of the American Physiological Society and The Physiological Society. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Research
Ikonomov, Ognian C.
Sbrissa, Diego
Delvecchio, Khortnal
A. Rillema, James
Shisheva, Assia
Unexpected severe consequences of Pikfyve deletion by aP2‐ or Aq‐promoter‐driven Cre expression for glucose homeostasis and mammary gland development
title Unexpected severe consequences of Pikfyve deletion by aP2‐ or Aq‐promoter‐driven Cre expression for glucose homeostasis and mammary gland development
title_full Unexpected severe consequences of Pikfyve deletion by aP2‐ or Aq‐promoter‐driven Cre expression for glucose homeostasis and mammary gland development
title_fullStr Unexpected severe consequences of Pikfyve deletion by aP2‐ or Aq‐promoter‐driven Cre expression for glucose homeostasis and mammary gland development
title_full_unstemmed Unexpected severe consequences of Pikfyve deletion by aP2‐ or Aq‐promoter‐driven Cre expression for glucose homeostasis and mammary gland development
title_short Unexpected severe consequences of Pikfyve deletion by aP2‐ or Aq‐promoter‐driven Cre expression for glucose homeostasis and mammary gland development
title_sort unexpected severe consequences of pikfyve deletion by ap2‐ or aq‐promoter‐driven cre expression for glucose homeostasis and mammary gland development
topic Original Research
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4908490/
https://www.ncbi.nlm.nih.gov/pubmed/27273882
http://dx.doi.org/10.14814/phy2.12812
work_keys_str_mv AT ikonomovognianc unexpectedsevereconsequencesofpikfyvedeletionbyap2oraqpromoterdrivencreexpressionforglucosehomeostasisandmammaryglanddevelopment
AT sbrissadiego unexpectedsevereconsequencesofpikfyvedeletionbyap2oraqpromoterdrivencreexpressionforglucosehomeostasisandmammaryglanddevelopment
AT delvecchiokhortnal unexpectedsevereconsequencesofpikfyvedeletionbyap2oraqpromoterdrivencreexpressionforglucosehomeostasisandmammaryglanddevelopment
AT arillemajames unexpectedsevereconsequencesofpikfyvedeletionbyap2oraqpromoterdrivencreexpressionforglucosehomeostasisandmammaryglanddevelopment
AT shishevaassia unexpectedsevereconsequencesofpikfyvedeletionbyap2oraqpromoterdrivencreexpressionforglucosehomeostasisandmammaryglanddevelopment