Regulation and compartmentation of PC metabolism

Joseph J. Baldassare, Polly J. Phillips, Daniel Max Raben

Research output: Contribution to journalArticle

Abstract

The addition of a-thronibin io quiescent IIC9 cells results in the stimulation of PI and PC metabolism. PC metabolism involves the activation of a PC PI,I) and PLA2 as well as an ''apparent1' PC-PLC activity. We further demonstrated that a PC-PLD ifc activated at the nucleus and this activation is mediated by RhoA. The present studies were designed to examine the molecular mechanisms regulating a-thrombin-induced PC.' metabolism, including those occuring at the nuclear envelope. We demonstrate that one a-thrombin receptor, couples to both PI and PC metabolism but that this occurs via different G proteins. PI metabolism is mediated via a Gq protein while much of the PC metabolism is mediated via betagammadimers associated with Go. The activation of PC-P LI) and PLA2 are mediated by G proteins distinct from Gq or the Go betagamma dimerb. We have cloned a PLO in IIC!) and show that these cells contain both a hamster PLDl that resembles the human PLDlb (hamPLDlb). and a PLD2. Interestingly, while nuclear PLD activity is increased in response to a thrombin, PLD in the Golgi is unaffected even though both fractions contain a hamPLDlb. Taken together, these results indicate that the specificity of PLD activation (and PLA2) is regulated at two levels; (a)by the initial G proteins and {!)) by the immediate downstream activators. Studies to examine other nuclear enzvmrs and regulators are in prepress.

Original languageEnglish (US)
JournalFASEB Journal
Volume12
Issue number8
StatePublished - 1998
Externally publishedYes

Fingerprint

Metabolism
metabolism
thrombin
Gq-G11 GTP-Binding Protein alpha Subunits
Chemical activation
G-proteins
GTP-Binding Proteins
Thrombin
Thrombin Receptors
Nuclear Envelope
nuclear membrane
hamsters
Cricetinae
cells
receptors
1-dodecylpyridoxal
proteins

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Cell Biology

Cite this

Baldassare, J. J., Phillips, P. J., & Raben, D. M. (1998). Regulation and compartmentation of PC metabolism. FASEB Journal, 12(8).

Regulation and compartmentation of PC metabolism. / Baldassare, Joseph J.; Phillips, Polly J.; Raben, Daniel Max.

In: FASEB Journal, Vol. 12, No. 8, 1998.

Research output: Contribution to journalArticle

Baldassare, JJ, Phillips, PJ & Raben, DM 1998, 'Regulation and compartmentation of PC metabolism', FASEB Journal, vol. 12, no. 8.
Baldassare, Joseph J. ; Phillips, Polly J. ; Raben, Daniel Max. / Regulation and compartmentation of PC metabolism. In: FASEB Journal. 1998 ; Vol. 12, No. 8.
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