Optimal duration of risperidone or olanzapine adjunctive therapy to mood stabilizer following remission of a manic episode: A CANMAT randomized double-blind trial.

Atypical antipsychotic adjunctive therapy to lithium or valproate is effective in treating acute mania. Although continuation of atypical antipsychotic adjunctive therapy after mania remission reduces relapse of mood episodes, the optimal duration is unknown. As many atypical antipsychotics cause weight gain and metabolic syndrome, they should not be continued unless the benefits outweigh the risks. This 52-week double-blind placebo-controlled trial recruited patients with bipolar I disorder (n=159) who recently remitted from a manic episode during treatment with risperidone or olanzapine adjunctive therapy to lithium or valproate. Patients were randomized to one of three conditions: discontinuation of risperidone or olanzapine and substitution with placebo at (i) entry ('0-weeks' group) or (ii) at 24 weeks after entry ('24-weeks' group) or (iii) continuation of risperidone or olanzapine for the full duration of the study ('52-weeks' group). The primary outcome measure was time to relapse of any mood episode. Compared with the 0-weeks group, the time to any mood episode was significantly longer in the 24-weeks group (hazard ratio (HR) 0.53; 95% confidence interval (CI): 0.33, 0.86) and nearly so in the 52-weeks group (HR: 0.63; 95% CI: 0.39, 1.02). The relapse rate was similar in the 52-weeks group compared with the 24-weeks group (HR: 1.18; 95% CI: 0.71, 1.99); however, sub-group analysis showed discordant results between the two antipsychotics (HR: 0.48, 95% CI: 0.17; 1.32 olanzapine patients; HR: 1.85, 95% CI: 1.00, 3.41 risperidone patients). Average weight gain was 3.2 kg in the 52-weeks group compared with a weight loss of 0.2 kg in the 0-weeks and 0.1 kg in the 24-weeks groups. These findings suggest that risperidone or olanzapine adjunctive therapy for 24 weeks is beneficial but continuation of risperidone beyond this period does not reduce the risk of relapse. Whether continuation of olanzapine beyond this period reduces relapse risk remains unclear but the potential benefit needs to be weighed against an increased risk of weight gain.

Elevated serum measures of lipid peroxidation and abnormal prefrontal white matter in euthymic bipolar adults: toward peripheral biomarkers of bipolar disorder.

Diffusion tensor imaging (DTI) studies consistently reported abnormalities in fractional anisotropy (FA) and radial diffusivity (RD), measures of the integrity of white matter (WM), in bipolar disorder (BD), that may reflect underlying pathophysiologic processes. There is, however, a pressing need to identify peripheral measures that are related to these WM measures, to help identify easily obtainable peripheral biomarkers of BD. Given the high lipid content of axonal membranes and myelin sheaths, and that elevated serum levels of lipid peroxidation are reported in BD, these serum measures may be promising peripheral biomarkers of underlying WM abnormalities in BD. We used DTI and probabilistic tractography to compare FA and RD in ten prefrontal-centered WM tracts, 8 of which are consistently shown to have abnormal FA (and/or RD) in BD, and also examined serum lipid peroxidation (lipid hydroperoxides, LPH and 4-hydroxy-2-nonenal, 4-HNE), in 24 currently euthymic BD adults (BDE) and 19 age- and gender-matched healthy adults (CONT). There was a significant effect of group upon FA in these a priori WM tracts (BDECONT: F[1,41]=10.3; P=0.003), and a significant between-group difference in LPH (BDE>CONT: t[40]=2.4; P=0.022), but not in 4-HNE. Multivariate multiple regression analyses revealed that LPH variance explained, respectively, 59 and 51% of the variance of FA and RD across all study participants. This is the first study to examine relationships between measures of WM integrity and peripheral measures of lipid peroxidation. Our findings suggest that serum LPH may be useful in the development of a clinically relevant, yet easily obtainable and inexpensive, peripheral biomarkers of BD.

Low rate of prenatal diagnosis among neonates with critical aortic stenosis: insight into the natural history in utero.

OBJECTIVES: To better understand the natural history and spectrum of fetal aortic stenosis (AS), we aimed to (1) determine the prenatal diagnosis rate of neonates with critical AS and a biventricular (BV) outcome, and (2) describe the findings at fetal echocardiography in patients diagnosed prenatally. METHODS: A multicenter, retrospective study was performed on neonates who presented with critical AS and who were discharged with a BV outcome from 2000 to 2013. The prenatal diagnosis rate was compared with that reported for hypoplastic left heart syndrome (HLHS). We reviewed fetal echocardiographic findings in patients who were diagnosed prenatally. RESULTS: In only 10 (8.5%) of 117 neonates with critical AS and a BV outcome was the diagnosis made prenatally, a rate significantly lower than that for HLHS in the contemporary era (82%; P < 0.0001). Of the 10 patients diagnosed prenatally, all had developed left ventricular dysfunction by a median gestational age of 33 (range, 28-35) weeks. When present, Doppler abnormalities such as retrograde flow in the aortic arch (n = 2), monophasic mitral inflow (n = 3) and left-to-right flow across the foramen ovale (n = 8) developed late in gestation (median 33 weeks). CONCLUSION: The prenatal diagnosis rate of critical AS and a BV outcome among neonates is very low, probably owing to a relatively normal four-chamber view in mid-gestation with development of significant obstruction in the third trimester. The natural history contrasts with that of severe mid-gestation AS with evolving HLHS and suggests that the gestational timing of development of significant AS has an important impact on subsequent left-heart growth in utero.

Neuroprotective effect of lithium on hippocampal volumes in bipolar disorder independent of long-term treatment response.

BACKGROUND: Neuroimaging studies have demonstrated an association between lithium (Li) treatment and brain structure in human subjects. A crucial unresolved question is whether this association reflects direct neurochemical effects of Li or indirect effects secondary to treatment or prevention of episodes of bipolar disorder (BD). METHOD: To address this knowledge gap, we compared manually traced hippocampal volumes in 37 BD patients with at least 2 years of Li treatment (Li group), 19 BD patients with <3 months of lifetime Li exposure over 2 years ago (non-Li group) and 50 healthy controls. All BD participants were followed prospectively and had at least 10 years of illness and a minimum of five episodes. We established illness course and long-term treatment response to Li using National Institute of Mental Health (NIMH) life charts. RESULTS: The non-Li group had smaller hippocampal volumes than the controls or the Li group (F 2,102 = 4.97, p = 0.009). However, the time spent in a mood episode on the current mood stabilizer was more than three times longer in the Li than in the non-Li group (t(51) = 2.00, p = 0.05). Even Li-treated patients with BD episodes while on Li had hippocampal volumes comparable to healthy controls and significantly larger than non-Li patients (t(43) = 2.62, corrected p = 0.02). CONCLUSIONS: Our findings support the neuroprotective effects of Li. The association between Li treatment and hippocampal volume seems to be independent of long-term treatment response and occurred even in subjects with episodes of BD while on Li. Consequently, these effects of Li on brain structure may generalize to patients with neuropsychiatric illnesses other than BD.

Mitochondrial DNA content and oxidation in bipolar disorder and its role across brain regions.

The underlying pathology of bipolar disorder remains unknown, though evidence is accumulating to support a role of mitochondrial dysfunction. In this study, we aim to investigate electron transport chain complex I subunit NDUFS7 protein expression; mtDNA content; common deletion; and oxidation in the Broadmann area 24 (BA24), cerebellum, hippocampus, and prefrontal cortex from patients with bipolar disorder, schizophrenia, and non-psychiatric controls. Here, we demonstrate no changes in NDUFS7 in BA24, cerebellum or hippocampus, increases in mtDNA content in hippocampus of patients with bipolar disorder, and decreases in mtDNA oxidation in patients with bipolar disorder and schizophrenia, respectively. Paired analysis between BA24 and cerebellum reveal increases within NDUFS7 levels and mtDNA content in cerebellum of patients with bipolar disorder or schizophrenia. We found a positive correlation between NDUFS7 and mtDNA content (ND4 and ND5) when combining brain regions. Our study supports the involvement of mitochondrial dysfunction in bipolar disorder and schizophrenia.

The effect of mood stabilizer lithium on expression and activity of glutathione s-transferase isoenzymes.

Chronic treatment with the mood stabilizer lithium is required to generate its mood stabilizing effect in the treatment of bipolar disorder. Our recent studies have shown that chronic lithium treatment increases mRNA and protein levels of the cytosolic glutathione s-transferase (GST) M1 isoenzyme. Cytosolic GST encompasses a family of detoxification enzymes that include four main classes: alpha (A), mu (M), pi (P) and theta (T). The purpose of this study is to examine the effect of lithium on GST isoenzymes that are expressed in brain, and determine the role of GST in the neuroprotective effects of lithium against oxidative stress. We found in primary cultured rat cerebral cortical cells that chronic lithium treatment not only increased GST M1 mRNA levels, but also increased GST M3, M5 and A4 mRNA levels. Chronic lithium treatment increased GST enzyme activity when 1-chloro-2, 4-dinitrobenzene and 4-hydroxynonenal were used as substrates. In addition, we found that chronic lithium treatment inhibited reactive oxygen metabolite H(2)O(2)-induced cell death and DNA fragmentation in primary cultured rat cerebral cortical cells, while GST inhibitor ethacrynic acid reduced the neuroprotective effect of lithium against H(2)O(2)-induced cell death and DNA fragmentation. Since GST conjugates glutathione, the major antioxidant in brain, with a variety of oxidized products to form nontoxic products, and plays an important role in cellular protection against oxidative stress, our findings suggest that lithium selectively targets GST isoenzymes in order to produce neuroprotective effects against oxidative stress.

Role of glutathione in neuroprotective effects of mood stabilizing drugs lithium and valproate.

Mood stabilizing drugs lithium and valproate are the most commonly used treatments for bipolar disorder. Previous studies in our laboratory indicate that chronic treatment with lithium and valproate inhibits oxidative damage in primary cultured rat cerebral cortical cells. Glutathione, as the major antioxidant in the brain, plays a key role in defending against oxidative damage. The purpose of this study was to determine the role of glutathione in the neuroprotective effects of lithium and valproate against oxidative damage. We found that chronic treatment with lithium and valproate inhibited reactive oxygen metabolite H(2)O(2)-induced cell death in primary cultured rat cerebral cortical cells, while buthionine sulfoximine, an inhibitor of glutathione rate-limiting synthesis enzyme glutamate-cysteine ligase, reduced the neuroprotective effect of lithium and valproate against H(2)O(2)-induced cell death. Further, we found that chronic treatment with lithium and valproate increased glutathione levels in primary cultured rat cerebral cortical cells and that the effects of lithium and valproate on glutathione levels were dose-dependent in human neuroblastoma SH-SY5Y cells. Chronic treatment with lithium and valproate also increased the expression of glutamate-cysteine ligase in both rat cerebral cortical cells and SH-SY5Y cells. In addition, chronic treatment with other mood stabilizing drugs lamotrigine and carbamazepine, but not antidepressants desipramine and fluoxetine, increased both glutathione levels and the expression of glutamate-cysteine ligase in SH-SY5Y cells. These results suggest that glutathione plays an important role in the neuroprotective effects of lithium and valproate, and that glutathione may be a common target for mood stabilizing drugs.

Effects of restraint stress on the expression of proteins involved in synaptic vesicle exocytosis in the hippocampus.

Chronic restraint stress has been associated with induction of morphological changes in the hippocampus. Postsynaptically, these changes include decreased length and branching of apical dendrites from CA3 pyramidal neurons, while presynaptically, depletion and clustering of synaptic vesicles have been observed. However, the molecular correlates of these changes remain poorly defined; while some studies have identified changes in the levels of some presynaptic proteins, none have assessed the coordinate expression of components of the membrane fusion complex, including synaptobrevin, syntaxin, and synaptosomal-associated protein 25 kDa, and their major regulatory molecules synaptotagmin, synaptophysin, and synapsin. Therefore, we undertook to assess the immunoreactivity of these proteins in hippocampal slices obtained from rats subjected to either acute (one 6 h session) or chronic (21 days at 6 h per day) of restraint stress. Specifically, we observed a significant increase in synaptobrevin immunoreactivity in the inner molecular layer of the dentate gyrus (54.2%; P=0.005), the stratum radiatum in the CA1 subfield (55.5%; P=0.007), and a region including the stratum lucidum and the proximal portion of the stratum radiatum in the CA3 subfield (52.7%; P=0.002); we also observed a trend toward increased synaptophysin levels in the stratum lucidum/radiatum of the CA3 subfield (8.0%; P=0.051) following chronic, but not acute, restraint stress. In that synaptobrevin has been associated with replenishment of the "readily-releasable" pool of synaptic vesicles and the efficiency of neurotransmitter release, the present results suggest that stress-induced changes in synaptobrevin may at least in part underlie the previously observed changes in synaptic and neuronal morphology.

Chronic valproate treatment increases expression of endoplasmic reticulum stress proteins in the rat cerebral cortex and hippocampus.

BACKGROUND: Sodium valproate is a highly effective treatment for bipolar disorder, but its mechanism of action remains poorly understood. We recently found with differential display polymerase chain reaction that valproate regulates the expression of the endoplasmic reticulum stress protein GRP78 in the rat cerebral cortex. In our study, we investigated the effect of this drug on the other members of the endoplasmic reticulum stress protein family, GRP94 and calreticulin, and we studied the brain regional distribution of GRP78, GRP94, and calreticulin. METHODS: Immunohistochemistry was used to measure protein levels of GRP78, GRP94, and calreticulin after treatment with sodium valproate (300 mg/kg, intraperitoneal) in specific rat brain regions. RESULTS: We report here that chronic treatment with valproate also increased expression of other members of the endoplasmic reticulum stress protein family, such as GRP94 and calreticulin. The brain regional distribution of these changes was similar for all three proteins, with marked increase detected in the frontal cortex, parietal cortex, and CA1 region of the hippocampus. CONCLUSIONS: Because GRP78, GRP94, and calreticulin possess molecular chaperone activity and bind Ca(2+) in the endoplasmic reticulum, the pharmacologic action of valproate may involve one or more of these processes.

Reduced brain 5-HT and elevated NE turnover and metabolites in bipolar affective disorder.

Levels of norepinephrine (NE), serotonin (5-HT), dopamine (DA), and their major metabolites were determined in postmortem brain obtained from nine subjects with antemortem histories meeting DSM-III-R criteria for bipolar affective disorder. Compared with controls, no statistically significant differences were found in mean levels of NE, 5-HT, or DA in any brain area of bipolar subjects. NE turnover as estimated by the ratio of the major NE metabolite, 3-methoxy-4-hydroxyphenylethyleneglycol (MHPG) to NE was increased in frontal (+107%), temporal (+103%), and occipital (+64%) cortex and thalamus (+83%). Significant decreases were found in the major 5-HT metabolite 5-hydroxyindoleacetic acid (5-HIAA), in frontal (-54%) and parietal cortex (-64%), and in 5-HIAA/5-HT ratio in temporal cortex (-55%), with a trend for decreases in both measures in caudate nucleus. In addition, levels of the major DA metabolite, homovanillic acid (HVA) were significantly decreased (-46%) in parietal cortex and HVA/DA ratios were significantly reduced (-66%) in occipital cortex obtained from bipolar compared to control subjects. Our data, taken together with previous findings regarding monoamines in postmortem brain of depressed and suicide subjects, suggest that decreased 5-HT metabolite levels and turnover may be common to all mood disorders. Increased cortical NE turnover, however, may be a more important component in the pathophysiology of bipolar disorder.

Increased hippocampal BDNF immunoreactivity in subjects treated with antidepressant medication.

BACKGROUND: The cAMP signaling pathway, and its downstream neurotrophic factor BDNF, are major targets of antidepressant medications. Abnormalities in this pathway have previously been reported in postmortem brain of subjects with mood disorders. This study was designed to test whether the diagnosis of a mood disorder, or treatment with an antidepressant or mood stabilizer was associated with changes in hippocampal BDNF in postmortem brain. METHODS: Frozen postmortem anterior hippocampus sections were obtained from the Stanley Foundation Neuropathology Consortium. Tissue from subjects with major depression, bipolar disorder, schizophrenia and nonpsychiatric control subjects were stained for BDNF using immunohistochemistry. RESULTS: Increased BDNF expression was found in dentate gyrus, hilus and supragranular regions in subjects treated with antidepressant medications at the time of death, compared with antidepressant-untreated subjects. Furthermore, there was a trend toward increased BDNF expression in hilar and supragranular regions in depressed subjects treated with antidepressants, compared with the subjects not on these medications at the time of death. CONCLUSIONS: These findings are consistent with recent studies measuring CREB levels in this same subject sample, and support current animal and cellular models of antidepressant function.

Effects of chronic lithium and carbamazepine treatment on G-protein subunit expression in rat cerebral cortex.

Although lithium and carbamazepine (CBZ) are effective in the treatment of bipolar affective disorder, their mechanism of action is still unknown. Recent evidence suggests that lithium and CBZ might exert their therapeutic effects by modulating the function of guanosine triphosphate (GTP)-regulatory (G) proteins associated with central nervous system second messenger systems. In the present study, we showed that chronic lithium administration decreases G alpha s, G alpha i1, and G alpha i2 messenger RNA (mRNA) abundance by 25%-30% in rat cerebral cortex. However, the levels of G alpha s, G alpha i1, and G alpha i2 mRNA were unaffected by chronic CBZ treatment. The effects of lithium on G alpha s, G alpha i1, and G alpha i2 mRNA levels appear to be selective, as the mRNA levels of G alpha o, G alpha x, G beta 1, G beta 2, and G beta 3 subunits remained unchanged. Two days after terminating chronic lithium treatment, changes in G alpha s, G alpha i1, and G alpha i2 mRNA levels were not demonstrable. Short-term administration of lithium (2 days), however, reduced only the G alpha i2 mRNA levels. Surprisingly, there was no significant difference in the amount of immunologically detectable G alpha s-s, G alpha s-1, G alpha i(1 + 2), G alpha 0, and G beta (1 + 2) in the cortex of rats chronically treated with lithium or CBZ, compared with controls.(ABSTRACT TRUNCATED AT 250 WORDS)

Increased G alpha q/11 immunoreactivity in postmortem occipital cortex from patients with bipolar affective disorder.

As disturbances in guanine nucleotide binding (G) protein-coupled phosphoinositide second messenger systems have been implicated in bipolar disorder, we examined whether the abundance of G alpha q/11 and phospholipase C (PLC)-beta 1 two key transducing proteins in this signaling pathway, are altered in this disorder. Compared with the controls, immunoreactive levels of G alpha q/11 were significantly elevated by 62% (p = .047) in occipital cortex of bipolar subjects. A similar increase (52%) in the PLC-beta 1 immunolabeling was also found in the occipital cortex of the bipolar subjects, but only reached marginal statistical significance (p = .07). In contrast, frontal and temporal cortex G alpha q/11 or PLC-beta 1 immunolabeling did not differ between bipolar and control subjects. Cerebral cortical immunoreactive levels of G beta 1 or G beta 2, included as a negative control, were not different between comparison groups. These findings support and extend earlier observations suggesting that disturbances in G protein-coupled second messenger signaling pathways may play an important role in the pathophysiology of bipolar affective disorder.

Quantification of neuroreceptors in the living human brain: IV. Effect of aging and elevations of D2-like receptors in schizophrenia and bipolar illness.

In a previous study of 10 drug-naive schizophrenic patients, the density of D2 dopamine receptors was found to be elevated in the caudate nucleus. The study raised questions about the influence of the age of the patients, the relationship of receptor density to psychosis, and the accuracy of the method used to obtain this evidence. Using positron emission tomography and constrained analysis of the brain uptake of the radioligand N-[11C]methyl-spiperone ([11C]NMSP), we tested four questions: Were the assumptions underlying the quantitation valid? Is there an age decline of the density of D2-like dopamine receptors in drug-naive schizophrenia and bipolar illness? If so, is it different from that observed in normal aging? Are D2-like dopamine receptors elevated at any age in either drug-naive schizophrenic or psychotic bipolar illness patients? NMSP and haloperidol partition volumes and plasma protein fractions were not significantly different among patient groups and normal volunteers. The model-derived assay of radioligand metabolites in plasma was confirmed by high-performance liquid chromatography in the patient groups. D2-like dopamine receptors declined with age, and the slope did not differ significantly between the schizophrenic patients, bipolar affective illness patients, and normal controls. Taking the effect of age into account, increases in D2 dopamine receptor density were found in seven psychotic patients with bipolar affective illness compared with seven nonpsychotic patients and 24 control subjects as well as in 22 drug-naive schizophrenic patients compared with the 24 control subjects.

Mononuclear leukocyte levels of G proteins in depressed patients with bipolar disorder or major depressive disorder.

Stimulatory (Gs) and inhibitory (G(i)) guanine nucleotide binding protein alpha subunit levels were measured in mononuclear leukocytes from 22 drug-free depressed patients (eight with bipolar disorder, 14 with major depressive disorder) and a comparison group of 17 age- and sex-matched healthy subjects. The levels of Gs alpha and G(i) alpha were significantly higher (160% and 114%, respectively) in the bipolar patients, but not the patients with major depressive disorder, than in the healthy subjects. These data add to the evidence for abnormalities in G protein levels and function in the pathophysiology of bipolar disorder.

Double-blind comparison of addition of a second mood stabilizer versus an antidepressant to an initial mood stabilizer for treatment of patients with bipolar depression.

OBJECTIVE: This study's purpose was to clarify the appropriate treatment of bipolar depression by comparing the addition of an antidepressant versus a second mood stabilizer for inpatients being treated with lithium carbonate or divalproex sodium. METHOD: Twenty-seven patients were randomly assigned to groups that received double-blind treatment with paroxetine or a second mood stabilizer (lithium carbonate or divalproex sodium) for 6 weeks. RESULTS: Both groups showed significant improvement in depressive symptoms during the 6-week trial. There were significantly more noncompleters in the group being treated with the two mood stabilizers than in the group being treated with a mood stabilizer and paroxetine. CONCLUSIONS: Both treatments appeared to be effective; however, the addition of an antidepressant may have greater clinical utility in the treatment of bipolar depression.

Differential display PCR reveals increased expression of 2',3'-cyclic nucleotide 3'-phosphodiesterase by lithium.

Differential display PCR was used to study the effects of lithium on gene expression. Four candidate genes were isolated and verified by Northern hybridization after 1 week treatment of C6 glioma cells with therapeutically relevant concentrations of LiCl (1 mM). Sequencing analysis revealed three previously unidentified cDNA fragments in addition to a sequence with 99% homology with the cDNA for 2',3'-cyclic nucleotide 3'-phosphodiesterase type II (CNPaseII). Since CNPaseII is important in myelinogenesis and possibly neuronal growth and repair, the present findings suggest that lithium treatment may regulate these processes.

Striatal monoamine neurotransmitters and metabolites in dominantly inherited olivopontocerebellar atrophy.

We measured the levels of the monoamine neurotransmitters and metabolites in striatum of 14 patients with end-stage dominantly inherited olivopontocerebellar atrophy (OPCA). On average, dopamine levels were reduced in putamen (-53%), caudate (-35%), and nucleus accumbens (-31%). However, individual patient values showed a wide variation, indicating that mild to moderate striatal dopamine loss is a common but not constant feature of OPCA. Seven patients had marked putamen dopamine loss (-62% to -81%) but without evidence of correspondingly severe substantia nigra cell damage; this suggests the possibility of a "dying-back" phenomenon in which nerve terminal loss precedes cell body degeneration. Severe substantia nigra cell loss with almost total (-95% to -99%) putamen and caudate dopamine depletion was present in two patients; however, none of the 14 patients had had a clinical diagnosis of parkinsonism or was receiving antiparkinsonian medication. Mean striatal serotonin levels were normal, whereas concentrations of the serotonin metabolite 5-hydroxyindoleacetic acid were elevated by 47% to 63%; this suggests increased activity of raphe dorsalis serotonin neurons innervating the striatum, which might aggravate the functional consequences of the dopamine deficit.