Phospholipid synthesis participates in the regulation of diacylglycerol required for membrane trafficking at the Golgi complex

Elisabet Sarri, Adrià Sicart, Francisco Lazaro-Dieguez, Gustavo Egea

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The lipid metabolite diacylglycerol (DAG) is required for transport carrier biogenesis at the Golgi, although how cells regulate its levels is not well understood. Phospholipid synthesis involves highly regulated pathways that consume DAG and can contribute to its regulation. Here we altered phosphatidylcholine (PC) and phosphatidylinositol synthesis for a short period of time in CHO cells to evaluate the changes in DAG and its effects in membrane trafficking at the Golgi. We found that cellular DAG rapidly increased when PC synthesis was inhibited at the non-permissive temperature for the rate-limiting step of PC synthesis inCHO-MT58cells.DAGalso increased when choline and inositol were not supplied. The major phospholipid classes and triacylglycerol remained unaltered for both experimental approaches. The analysis of Golgi ultrastructure and membrane trafficking showed that 1) the accumulation of the budding vesicular profiles induced by propanolol was prevented by inhibition of PC synthesis, 2) the density of KDEL receptor-containing punctated structures at the endoplasmic reticulum-Golgi interface correlated with the amount of DAG, and 3) the post- Golgi transport of the yellow fluorescent temperature-sensitive G protein of stomatitis virus and the secretion of a secretory form of HRP were both reduced when DAG was lowered. We confirmed that DAG-consuming reactions of lipid synthesis were present in Golgi-enriched fractions. We conclude that phospholipid synthesis pathways play a significant role to regulate the DAG required in Golgi-dependent membrane trafficking.

Original languageEnglish (US)
Pages (from-to)28632-28643
Number of pages12
JournalJournal of Biological Chemistry
Volume286
Issue number32
DOIs
StatePublished - Aug 12 2011

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Diglycerides
Golgi Apparatus
Phospholipids
Membranes
Phosphatidylcholines
Lipids
Stomatitis
Temperature
Carrier transport
CHO Cells
Inositol
Metabolites
Phosphatidylinositols
Choline
Viruses
GTP-Binding Proteins
Propranolol
Endoplasmic Reticulum
Triglycerides

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Cite this

Phospholipid synthesis participates in the regulation of diacylglycerol required for membrane trafficking at the Golgi complex. / Sarri, Elisabet; Sicart, Adrià; Lazaro-Dieguez, Francisco; Egea, Gustavo.

In: Journal of Biological Chemistry, Vol. 286, No. 32, 12.08.2011, p. 28632-28643.

Research output: Contribution to journalArticle

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