Nelly E. Villacreses

Rat brain arachidonic acid metabolism is increased by a 6-day intracerebral ventricular infusion of bacterial lipopolysaccharide

Palmitate (16:0) 80.2 ± 10.9 81.9 ± 10.9 26.2 ± 0.3 27.0 ± 1.1 11.2 ± 2.6 13.4 ± 3.9 Stearate (18:0) 26.8 ± 4.3 24.6 ± 2.8 48.0 ± 8.0 59.0 ± 9.2 1.9 ± 1.5 3.2 ± 1.8 Oleate (18:1n-9) 35.3 ± 10.0 37.5 ± 8.4 36.6 ± 4.9 38.8 ± 1.4 10.6 ± 3.1 11.7 ± 3.3 Linoleate (18:2n-6) 38.5 ± 10.6 39.8 ± 7.5 1.8 ± 0.2 *3.7 ± 0.3 4.0 ± 1.2 5.5 ± 3.9 Arachidonate (20:4n-6) 8.9 ± 2.8 6.2 ± 1.8 8.2 ± 0.1 *19.7 ± 3.6 0.7 ± 0.3 0.5 ± 0.4 Docosahexaenoate (22:6n-3) 8.7 ± 3.2 8.1 ± 2.9 1.2 ± 0.8 1.7 ± 0.2 0.6 ± 0.3 0.8 ± 0.3

Rat brain arachidonic acid metabolism is increased by a 6-day intracerebral ventricular infusion of bacterial lipopolysaccharide: Neuroinflammation alters brain arachidonic acid metabolism

In a rat model of acute neuroinflammation, produced by a 6‐day intracerebral ventricular infusion of bacterial lipopolysaccharide (LPS), we measured brain activities and protein levels of three phospholipases A2 (PLA2) and of cyclo‐oxygenase‐1 and ‐2, and quantified other aspects of brain phospholipid and fatty acid metabolism. The 6‐day intracerebral ventricular infusion increased lectin‐reactive microglia in the cerebral ventricles, pia mater, and the glial membrane of the cortex and resulted in morphological changes of glial fibrillary acidic protein (GFAP)‐positive astrocytes in the cortical mantel and areas surrounding the cerebral ventricles. LPS infusion increased brain cytosolic and secretory PLA2 activities by 71% and 47%, respectively, as well as the brain concentrations of non‐esterified linoleic and arachidonic acids, and of prostaglandins E2 and D2. LPS infusion also increased rates of incorporation and turnover of arachidonic acid in phosphatidylethanolamine, plasmenylethanolamine, phosphatidylcholine, and plasmenylcholine by 1.5‐ to 2.8‐fold, without changing these rates in phosphatidylserine or phosphatidylinositol. These observations suggest that selective alterations in brain arachidonic acid metabolism involving cytosolic and secretory PLA2 contribute to early pathology in neuroinflammation.

Chronic lithium administration attenuates up-regulated brain arachidonic acid metabolism in a rat model of neuroinflammation

Neuroinflammation, caused by a 6‐day intracerebroventricular infusion of lipopolysaccharide (LPS) in rats, is associated with the up‐regulation of brain arachidonic acid (AA) metabolism markers. Because chronic LiCl down‐regulates markers of brain AA metabolism, we hypothesized that it would attenuate increments of these markers in LPS‐infused rats. Incorporation coefficients k* of AA from plasma into brain, and other brain AA metabolic markers, were measured in rats that had been fed a LiCl or control diet for 6 weeks, and subjected in the last 6 days on the diet to intracerebroventricular infusion of artificial CSF or of LPS. In rats on the control diet, LPS compared with CSF infusion increased k* significantly in 28 regions, whereas the LiCl diet prevented k* increments in 18 of these regions. LiCl in CSF infused rats increased k* in 14 regions, largely belonging to auditory and visual systems. Brain cytoplasmic phospholipase A2 activity, and prostaglandin E2 and thromboxane B2 concentrations, were increased significantly by LPS infusion in rats fed the control but not the LiCl diet. Chronic LiCl administration attenuates LPS‐induced up‐regulation of a number of brain AA metabolism markers. To the extent that this up‐regulation has neuropathological consequences, lithium might be considered for treating human brain diseases accompanied by neuroinflammation.

In vivo imaging detects a transient increase in brain arachidonic acid metabolism: a potential marker of neuroinflammation

In a rat model of neuroinflammation produced by an intracerebral ventricular infusion of bacterial lipopolysaccaride (LPS), we measured the coefficients of incorporation (k*) of arachidonic acid (AA, 20 : 4n−6) from plasma into each of 80 brain regions, using quantitative autoradiography and intravenously injected [1–14C]AA. Compared with control rats infused with artificial cerebrospinal fluid (aCSF), k* was increased significantly in 25 brain areas, many of them close to the CSF compartments, following 6‐days of LPS infusion. The increases, ranging from 31 to 76%, occurred in frontal, motor, somatosensory, and olfactory cortex, thalamus, hypothalamus, and septal nuclei, and basal ganglia. Following 28 days of LPS infusion, k* was increased significantly in only two brain regions. Direct analyses of microwaved brain showed that 93 ± 3 (SD) and 94 ± 4% of brain radioactivity was in the organic extract as radiolabeled AA in the 6‐day control and LPS‐infused animals, respectively, compared with 91 ± 3 and 87 ± 6% in the 28‐day control and LPS‐infused animals. These results confirm that brain AA metabolism is disturbed after 6 days of LPS exposure, show this increase is transient, and that these changes can be detected and localized using in vivo imaging with radiolabeled AA.

Chronic Carbamazepine Administration Reduces N-Methyl-D-Aspartate Receptor–Initiated Signaling via Arachidonic Acid in Rat Brain

BACKGROUND Lithium and carbamazepine (CBZ) are used to treat mania in bipolar disorder. When given chronically to rats, both agents reduce arachidonic acid (AA) turnover in brain phospholipids and downstream AA metabolism. Lithium in rats also attenuates brain N-methyl-D-aspartic acid receptor (NMDAR) signaling via AA. We hypothesized that, like chronic lithium, chronic CBZ administration to rats would reduce NMDAR-mediated signaling via AA. METHODS We used our fatty acid method with quantitative autoradiography to image the regional brain incorporation coefficient k* of AA, a marker of AA signaling, in unanesthetized rats that had been given 25 mg/kg/day I.P. CBZ or vehicle for 30 days, then injected with NMDA (25 mg/kg I.P.) or saline. We also measured brain concentrations of two AA metabolites, prostaglandin E(2) (PGE(2)) and thromboxane B(2) (TXB(2)). RESULTS In chronic vehicle-treated rats, NMDA compared with saline increased k* significantly in 69 of 82 brain regions examined, but did not change k* significantly in any region in CBZ-treated rats. In vehicle- but not CBZ-treated rats, NMDA also increased brain concentrations of PGE(2) and TXB(2). CONCLUSIONS Chronic CBZ administration to rats blocks increments in the AA signal k*, and in PGE(2) and TXB(2) concentrations that are produced by NMDA in vehicle-treated rats. The clinical action of antimanic drugs might involve inhibition of brain NMDAR-mediated signaling involving AA and its metabolites.

Resting and arecoline-stimulated brain metabolism and signaling involving arachidonic acid are altered in the cyclooxygenase-2 knockout mouse

Studies were performed to determine if cyclooxygenase (COX)‐2 regulates muscarinic receptor‐initiated signaling involving brain phospholipase A2 (PLA2) activation and arachidonic acid (AA; 20 : 4n‐6) release. AA incorporation coefficients, k* (brain [1–14C]AA radioactivity/integrated plasma radioactivity), representing this signaling, were measured following the intravenous injection of [1–14C]AA using quantitative autoradiography, in each of 81 brain regions in unanesthetized COX‐2 knockout (COX‐2–/–) and wild‐type (COX‐2+/+) mice. Mice were administered arecoline (30 mg/kg i.p.), a non‐specific muscarinic receptor agonist, or saline i.p. (baseline control). At baseline, COX‐2–/– compared with COX‐2+/+ mice had widespread and significant elevations of k*. Arecoline increased k* significantly in COX‐2+/+ mice compared with saline controls in 72 of 81 brain regions, but had no significant effect on k* in any region in COX‐2–/– mice. These findings, when related to net incorporation rates of AA from brain into plasma, demonstrate enhanced baseline brain metabolic loss of AA in COX‐2–/– compared with COX‐2+/+ mice, and an absence of a normal k* response to muscarinic receptor activation. This response likely reflects selective COX‐2‐mediated conversion of PLA2‐released AA to prostanoids.

Rat brain docosahexaenoic acid metabolism is not altered by a 6-day intracerebral ventricular infusion of bacterial lipopolysaccharide

In a rat model of neuroinflammation, produced by a 6-day intracerebral ventricular infusion of bacterial lipopolysaccharide (LPS), we reported that the brain concentrations of non-esterified brain arachidonic acid (AA, 20:4 n-6) and its eicosanoid products PGE(2) and PGD(2) were increased, as were AA turnover rates in certain brain phospholipids and the activity of AA-selective cytosolic phospholipase A(2) (cPLA(2)). The activity of Ca(2+)-independent iPLA(2), which is thought to be selective for the release of docosahexaenoic acid (DHA, 22:6 n-3) from membrane phospholipid, was unchanged. In the present study, we measured parameters of brain DHA metabolism in comparable artificial cerebrospinal fluid (control) and LPS-infused rats. In contrast to the reported changes in markers of AA metabolism, the brain non-esterified DHA concentration and DHA turnover rates in individual phospholipids were not significantly altered by LPS infusion. The formation rates of AA-CoA and DHA-CoA in a microsomal brain fraction were also unaltered by the LPS infusion. These observations indicate that LPS-treatment upregulates markers of brain AA but not DHA metabolism. All of which are consistent with other evidence that suggest different sets of enzymes regulate AA and DHA recycling within brain phospholipids and that only selective increases in brain AA metabolism occur following a 6-day LPS infusion.