A novel arachidonic acid-selective cytosolic PLA2 contains a Ca2+-dependent translocation domain with homology to PKC and GAP

Clark, James D.; Lin, Lih-Ling; Kriz, Ronald; Ramesha, Chakkodabylu S.; Sultzman, Lisa A.; Lin, Alice; Milona, Nina; Knopf, John L.

doi:10.1016/0092-8674(91)90556-e

Cited by 1,639 publications

(1,142 citation statements)

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“…Importantly, k* is independent of changes in rCBF, thus reflecting only brain metabolic events (Chang et al, 1997;DeGeorge et al, 1991;Robinson et al, 1992;Robinson and Rapoport, 1986). Dopaminergic D 2 -like receptors can be coupled specifically to Ca 2 + -dependent AA-selective cytosolic PLA 2 (cPLA 2 ) (Clark et al, 1991;Dennis, 1994;Nilsson et al, 1998;Vial and Piomelli, 1995), which is localized on excitatory post-synaptic neuronal membranes and dendrites (Ong et al, 1999;Pardue et al, 2003). D 1 -like receptors have not been reported to be coupled to PLA 2 in normal brain (Bhattacharjee et al, 2005b), but rather to phospholipase C or adenylate cyclase (Cooper et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

D-Amphetamine Stimulates D₂Dopamine Receptor-Mediated Brain Signaling Involving Arachidonic Acid in Unanesthetized Rats

Bhattacharjee

Chang

White

et al. 2006

J Cereb Blood Flow Metab

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In rat brain, dopaminergic D 2 -like but not D 1 -like receptors can be coupled to phospholipase A 2 (PLA 2 ) activation, to release the second messenger, arachidonic acid (AA, 20:4n-6), from membrane phospholipids. In this study, we hypothesized that D-amphetamine, a dopamine-releasing agent, could initiate such AA signaling. The incorporation coefficient, k* (brain radioactivity/integrated plasma radioactivity) for AA, a marker of the signal, was determined in 62 brain regions of unanesthetized rats that were administered i.p. saline, D-amphetamine (2.5 or 0.5 mg/kg i.p.), or the D 2 -like receptor antagonist raclopride (6 mg/kg, i.v.) before saline or 2.5 mg/kg D-amphetamine. After injecting [1-14 C]AA intravenously, k* was measured by quantitative autoradiography. Compared to saline-treated controls, D-amphetamine 2.5 mg/kg i.p. increased k* significantly in 27 brain areas rich in D 2 -like receptors. Significant increases were evident in neocortical, extrapyramidal, and limbic regions. Pretreatment with raclopride blocked the increments, but raclopride alone did not alter baseline values of k*. In independent experiments, D-amphetamine 0.5 mg/kg i.p. increased k* significantly in only seven regions, including the nucleus accumbens and layer IV neocortical regions. These results indicate that D-amphetamine can indirectly activate brain PLA 2 in the unanesthetized rat, and that activation is initiated entirely at D 2 -like receptors. D-Amphetamine's lowdose effects are consistent with other evidence that the nucleus accumbens, considered a reward center, is particularly sensitive to the drug.

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Section: Introductionmentioning

confidence: 99%

D-Amphetamine Stimulates D₂Dopamine Receptor-Mediated Brain Signaling Involving Arachidonic Acid in Unanesthetized Rats

Bhattacharjee

Chang

White

et al. 2006

J Cereb Blood Flow Metab

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“…Crystallographic studies of cPLA 2 -α demonstrated the presence of two domains, an N-terminal calcium-phospholipid-binding (C2) domain and a catalytic domain [12]. Calcium promotes cytosol-to-membrane relocation of the cPLA 2 -α protein by binding to the C2-domain [13][14][15]. However, cPLA 2 -α targeting to membranes by calcium ions is complex since it is dependent both on the amplitude and the duration of the calcium increase [16,17].…”

Section: Introductionmentioning

confidence: 99%

Polychlorinated biphenyls induce arachidonic acid release in human platelets in a tamoxifen sensitive manner via activation of group IVA cytosolic phospholipase A2-α

Forsell

Olsson

Andersson

et al. 2005

Biochemical Pharmacology

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Polychlorinated biphenyls (PCBs) are stable compounds commonly found in nature as environmental pollutants. PCBs can affect the endocrine function of hormones such as steroid-hormones. Also, PCBs are known to be inducers of arachidonic acid release in various cells. We report, here, the effects of PCBs on eicosanoid formation, arachidonic acid release and cytosolic phospholipase A 2 -α(cPLA 2 -α) activation in human platelets. Ortho-substituted PCBs induced a time and dosedependent release of arachidonic acid and the concomitant formation of 12(S)-hydroxy-5,8-cis-10-trans-14-cis-eicosatetraenoic acid (12-HETE) and 12(S)-hydroxy-5-cis-8,10-transheptadecatrienoic acid (12-HHT) in human platelets. The release of arachidonic acid and the formation of 12-HETE was completely blocked by the cPLA 2 -α inhibitors AACOCF 3 or pyrrolidine-1. PCB-treatment of platelets demonstrated that the cPLA 2 -α protein as well as PLA 2 activity translocated to the membrane fraction, independent of a rise in intracellular Ca 2+ . Furthermore, electrophoretic gel mobility shift analysis of cPLA 2 -α on SDS-PAGE demonstrated a PCB-dependent phosphorylation of cPLA 2 -α. The effects of 17β-estradiol and two structurally unrelated anti-estrogens, nafoxidin and tamoxifen on PCB-induced arachidonic acid release in platelets were also investigated. Both nafoxidin and tamoxifen inhibited PCB-induced arachidonic acid release as well as 12-HETE and 12-HHT formation. Interestingly, platelets incubated with PCBs did not aggregate despite the fact that robust release of arachidonic acid was observed. In summary, these results demonstrate that certain PCBs induce activation of cPLA 2 -α independent of a rise in intracellular calcium and a robust release of arachidonic acid release with resulting eicosanoid formation in human platelets.

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“…This suggests that the elevated [Ca2+]i acts on arachidonic acid release via Ca2+/ calmodulin as previously shown in human platelet [27] and medullary [28] subcellular preparations. Recently, Ca2+ induction of phospholipase A2 has been suggested to be due to Ca2+-induced translocation of the enzyme from cytosol to membranes where the enzyme is facilitated to react with its substrates [29][30][31]. This idea was supported by the finding of a Ca2+_ dependent translocation domain with homology to protein kinase C and GTPase-activating protein, in a cytosolic phospholipase A2 of monocytic leukaemic U937 cells [31].…”

Section: Role Of [Ca2+] Increase and Protein Kinase C Activation In mentioning

confidence: 99%

“…Recently, Ca2+ induction of phospholipase A2 has been suggested to be due to Ca2+-induced translocation of the enzyme from cytosol to membranes where the enzyme is facilitated to react with its substrates [29][30][31]. This idea was supported by the finding of a Ca2+_ dependent translocation domain with homology to protein kinase C and GTPase-activating protein, in a cytosolic phospholipase A2 of monocytic leukaemic U937 cells [31]. Although in vitro Ca2+ has been shown to change the enzyme molecules from hydrophilic to hydrophobic forms [30], calmodulin is likely to be involved in this process in cellular events.…”

Section: Role Of [Ca2+] Increase and Protein Kinase C Activation In mentioning

confidence: 99%

Permissive stimulation of Ca(2+)-induced phospholipase A2 by an adenosine receptor agonist in a pertussis toxin-sensitive manner in FRTL-5 thyroid cells: a new ‘cross-talk’ mechanism in Ca2+ signalling.

Shimegi

Okajima

Kondo

1994

Biochemical Journal

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We have described the pertussis toxin (PTX)-sensitive potentiation of P2-purinergic agonist-induced phospholipase C activation, Ca2+ mobilization and arachidonic acid release by an adenosine receptor agonist, N6-(L-2-phenylisopropyl)adenosine (PIA), which alone cannot influence any of these cellular activities [Okajima, Sato, Nazarea, Sho and Kondo (1989) J. Biol. Chem. 264, 13029-13037]. In the present study we have found that arachidonic acid release was associated with lysophosphatidylcholine production, and conclude that arachidonic acid is produced by phospholipase A2 in FRTL-5 thyroid cells. This led us to assume that PIA augments P2-purinergic arachidonic acid release by increasing [Ca2+]i which, in turn, activates Ca(2+)-sensitive phospholipase A2. The arachidonic acid-releasing response to PIA was, however, always considerably higher (3.1-fold increase) than the Ca2+ response (1.3-fold increase) to the adenosine derivative. In addition, arachidonic acid release induced by the [Ca2+]i increase caused by thapsigargin, an endoplasmic-reticulum Ca(2+)-ATPase inhibitor, or calcium ionophores was also potentiated by PIA without any effect on [Ca2+]i and phospholipase C activity. This action of PIA was also PTX-sensitive, but not affected by the forskolin- or cholera toxin-induced increase in the cellular cyclic AMP (cAMP), suggesting that a PTX-sensitive G-protein(s) and not cAMP mediates the PIA-induced potentiation of Ca(2+)-generated phospholipase A2 activation. Although acute phorbol ester activation of protein kinase C induced arachidonic acid release, P2-purinergic and alpha 1-adrenergic stimulation of arachidonic acid release was markedly increased by the protein kinase C down-regulation caused by the phorbol ester. This suggests a suppressive role for protein kinase C in the agonist-induced activation of arachidonic acid release. We conclude that PIA (and perhaps any of the G1-activating agonists) augments an agonist (maybe any of the Ca(2+)-mobilizing agents)-induced arachidonic acid release by activation of Ca(2+)-dependent phospholipase A2 in addition to enhancement of agonist-induced phospholipase C followed by an increase in [Ca2+]i.

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A novel arachidonic acid-selective cytosolic PLA2 contains a Ca2+-dependent translocation domain with homology to PKC and GAP

Cited by 1,639 publications

References 43 publications

D-Amphetamine Stimulates D₂Dopamine Receptor-Mediated Brain Signaling Involving Arachidonic Acid in Unanesthetized Rats

D-Amphetamine Stimulates D₂Dopamine Receptor-Mediated Brain Signaling Involving Arachidonic Acid in Unanesthetized Rats

Polychlorinated biphenyls induce arachidonic acid release in human platelets in a tamoxifen sensitive manner via activation of group IVA cytosolic phospholipase A2-α

Permissive stimulation of Ca(2+)-induced phospholipase A2 by an adenosine receptor agonist in a pertussis toxin-sensitive manner in FRTL-5 thyroid cells: a new ‘cross-talk’ mechanism in Ca2+ signalling.

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A novel arachidonic acid-selective cytosolic PLA2 contains a Ca2+-dependent translocation domain with homology to PKC and GAP

Cited by 1,639 publications

References 43 publications

D-Amphetamine Stimulates D2Dopamine Receptor-Mediated Brain Signaling Involving Arachidonic Acid in Unanesthetized Rats

D-Amphetamine Stimulates D2Dopamine Receptor-Mediated Brain Signaling Involving Arachidonic Acid in Unanesthetized Rats

Polychlorinated biphenyls induce arachidonic acid release in human platelets in a tamoxifen sensitive manner via activation of group IVA cytosolic phospholipase A2-α

Permissive stimulation of Ca(2+)-induced phospholipase A2 by an adenosine receptor agonist in a pertussis toxin-sensitive manner in FRTL-5 thyroid cells: a new ‘cross-talk’ mechanism in Ca2+ signalling.

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D-Amphetamine Stimulates D₂Dopamine Receptor-Mediated Brain Signaling Involving Arachidonic Acid in Unanesthetized Rats

D-Amphetamine Stimulates D₂Dopamine Receptor-Mediated Brain Signaling Involving Arachidonic Acid in Unanesthetized Rats