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Dissecting signalling by individual Akt/PKB isoforms, three steps at once.

Cesar Osorio-Fuentealba1, Amira Klip2

  • 1Departamento de Kinesiología, Universidad Metropolitana de Ciencias de la Educación, Ñuñoa, 7760197 Santiago, Chile Program in Cell Biology, The Hospital for Sick Children, Toronto, Canada.

The Biochemical Journal
|September 9, 2015
PubMed
Summary

A new method allows researchers to study specific Akt isoforms (protein kinase B) in cells. This technique reveals Akt1 is crucial for fat cell development, while both Akt1 and Akt2 influence glucose uptake.

Keywords:
adipogenesisforkhead box O1 (FoxO1)glucose transporter (GLUT) 4 translocationinsulin signalling

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Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Biochemistry

Background:

  • The serine/threonine kinase Akt/PKB (protein kinase B) plays a critical role in mammalian cell growth, survival, metabolism, and cancer.
  • Identifying the specific functions of its three isoforms (Akt1, Akt2, Akt3) is challenging due to their overlapping expression patterns.
  • Previous methods like knockout and knockdown have limitations in dissecting isoform-specific roles in vivo and in vitro.

Purpose of the Study:

  • To develop and validate a novel strategy for studying Akt isoform selectivity in cell lines.
  • To elucidate the distinct roles of Akt1 and Akt2 in adipocyte differentiation and insulin signaling.
  • To enable acute and precise control over endogenous Akt isoform activity.

Main Methods:

  • Silencing of individual Akt/PKB isoforms in 3T3-L1 pre-adipocytes using short hairpin RNA (shRNA).
  • Selection of stable cell clones lacking specific Akt isoforms.
  • Reconstitution with isoform-specific mutants (Akt1(W80A) or Akt2(W80A)) resistant to MK-2206 inhibition, allowing acute activity control.

Main Results:

  • Confirmed Akt1 (PKBα) as the primary isoform driving adipocyte differentiation.
  • Demonstrated that both Akt1 and Akt2 can mediate insulin-dependent FoxO1 nuclear exclusion.
  • Observed that either Akt1 or Akt2 can support insulin-stimulated glucose transporter (GLUT) 4 translocation, contrasting with prior knockdown data.

Conclusions:

  • The developed system provides a powerful tool for dissecting isoform-specific Akt functions in various cellular contexts and stimuli.
  • This strategy facilitates high-throughput analysis, accelerating research into Akt signaling pathways.
  • Findings challenge previous assumptions about Akt2's exclusive role in GLUT4 translocation.