Growth and metabolic control of lipid signalling at the Golgi

Hailan Piao, Peter Mayinger

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

PtdIns4P is a key regulator of the secretory pathway and plays an essential role in trafficking from the Golgi. Our recent work demonstrated that spatial control of PtdIns4P at the ER (endoplasmic reticulum) and Golgi co-ordinates secretion with cell growth. The central elements of this regulation are specific phosphoinositide 4-kinases and the phosphoinositide phosphatase Sac1. Growth-dependent translocation of Sac1 between the ER and Golgi modulates the levels of PtdIns4P and anterograde traffic at the Golgi. In yeast, this mechanism is largely dependent on the availability of glucose, but our recent results in mammalian cells suggest that Sac1 phosphatases play evolutionarily conserved roles in the growth control of secretion. Sac1 lipid phosphatase plays also an essential role in the spatial control of PtdIns4P at the Golgi complex. A restricted pool of PtdIns4P at the TGN (trans-Golgi network) is required for Golgi integrity and for proper lipid and protein sorting. In mammalian cells, the stress-activated MAPK (mitogen-activated protein kinase) p38 appears to play a critical role in transmitting nutrient signals to the phosphoinositide signalling machinery at the ER and Golgi. These results suggest that temporal and spatial integration of metabolic and lipid signalling networks at the Golgi is required for controlling the secretory pathway.

Original languageEnglish (US)
Pages (from-to)205-209
Number of pages5
JournalBiochemical Society Transactions
Volume40
Issue number1
DOIs
StatePublished - Feb 2012

Fingerprint

Phosphoric Monoester Hydrolases
Endoplasmic Reticulum
Secretory Pathway
Phosphatidylinositols
Lipids
Growth
Cells
trans-Golgi Network
1-Phosphatidylinositol 4-Kinase
Cell growth
Golgi Apparatus
p38 Mitogen-Activated Protein Kinases
Protein Transport
Sorting
Yeast
Nutrients
Machinery
Yeasts
Availability
Glucose

Keywords

  • Golgi
  • Lipid signalling
  • Phosphoinositide
  • Sac1
  • Secretory pathway

ASJC Scopus subject areas

  • Biochemistry

Cite this

Growth and metabolic control of lipid signalling at the Golgi. / Piao, Hailan; Mayinger, Peter.

In: Biochemical Society Transactions, Vol. 40, No. 1, 02.2012, p. 205-209.

Research output: Contribution to journalArticle

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