ACl, 0.1 BSA, 0.1 Tween-20, and 0.1 NaN3, pH 7.4) and stored at 280 C until use. Ten microliters of a patient’s sera were diluted with 490 ml of reaction buffer. Thirty microliters of diluted patient sera and 20 ml of reaction buffer containing 20,000 cpm of [35S]-labeled human mAChR protein were incubated overnight at 4uC. The final dilution of each serum sample was 1:50. The reaction mixtures were transferred to each well in a 96-well filtration plate (Millipore, Benford, MA), which had been pretreated with blocking buffer (50 mmol/l Tris-HCl, 150 mmol/l NaCl, 3 BSA, and 0.1 NaN3, ph 7.4) at 4uC overnight. Ten microliters of 50 protein G Sepharose 4FF (Asiaticoside A biological activity Amersham Bioscience) was added to each well to isolate the immune complex and then incubated for 45 min at room temperature. The plate was washed 10 times with 200 ml washing buffer (50 mmol/l Tris-HCl, 150 mmol/l NaCl, and 1 Tween-20, pH 7.4) using a vacuum manifold (Millipore). The filter was dried and OptiPhase SuperMix (Perkin-Elmer Life Science, Boston, MA) was added to each well before the quantity of precipitated labeled protein was counted in a 1450 MicroBeta TriLux apparatus (Perkin-Elmer Life Science). All samples were measured in duplicate. The inter-assay coefficient of variation varied from 6.3 to 9.6 . The results were expressed as an antibody index and were calculated as follows:AntibodyIndex pmofthesampleserum{ pmofthenormalserum pmofthepositivestandardserum{ pmofthenormalpooledserumPET was performed as described previously [42] on a brain SHR12000 tomograph (Hamamatsu Photonics KK, Hamamatsu, Japan) having an intrinsic resolution of 2.962.963.4 scanner in full width at half maximum, 47 slices, and a 163-mm axial field of view. Two PET measurements using [11C](+)3-MPB and [11C]MP4A were performed sequentially at 3-hour intervals on the same day. The order of [11C](+)3-MPB and [11C]MP4A PET measurements were counterbalanced across subjects. The specific radioactivities of these ligands were found to be more than 50 GBq/mmol after synthesis of [11C](+)3-MPB and [11C]MP4A, respectively. After head fixation using a thermoplastic face mask, a 10-min transmission scan for attenuation correction was obtained. After a bolus injection of [11C](+)3-MPB (348.9657.2 MBq), serial PET scans were performed with a total duration of 92 min 23727046 (4630 sec, 2061 min, and 1465 min). After a bolus injection of [11C]MP4A (297.6653.8 MBq), serial PET scans were performed for a total of 62 min (4630 sec, 2061 min, and 865 min).PET Data AnalysisThe brain MRI was first co-registered to the PET image by pixel-wise kinetic modeling software (Pixel-Wise Kinetic Modeling Group, I-BRD9 Zurich, Switzerland). The following ROIs were drawn bilaterally on the registered MR images; dorsolateral prefrontal cortex, anterior cingulate cortex, amygdala, occipital cortex, parietal cortex, temporal cortex, orbitofrontal cortex, thalamus and cerebellum. These ROIs were then transferred onto the corresponding dynamic [11C](+)3-MPB images and static [11C]MP4A image. For [11C](+)3-MPB analysis, the Logan reference tissue method was used in pixel-wise kinetic modeling software. In this study, the cerebellum was used as the reference region [51]. The Logan reference tissue method allows the estimation of the distribution volume ratio (DVR), which can be expressed as follows [52]: ROItar (t)dt=ROItar (T)|Commericial antibodies to human mAChR M1 (C-20) (Santa Cruz Biotechnology, Santa Cruz, CA) was used as the positiv.ACl, 0.1 BSA, 0.1 Tween-20, and 0.1 NaN3, pH 7.4) and stored at 280 C until use. Ten microliters of a patient’s sera were diluted with 490 ml of reaction buffer. Thirty microliters of diluted patient sera and 20 ml of reaction buffer containing 20,000 cpm of [35S]-labeled human mAChR protein were incubated overnight at 4uC. The final dilution of each serum sample was 1:50. The reaction mixtures were transferred to each well in a 96-well filtration plate (Millipore, Benford, MA), which had been pretreated with blocking buffer (50 mmol/l Tris-HCl, 150 mmol/l NaCl, 3 BSA, and 0.1 NaN3, ph 7.4) at 4uC overnight. Ten microliters of 50 protein G Sepharose 4FF (Amersham Bioscience) was added to each well to isolate the immune complex and then incubated for 45 min at room temperature. The plate was washed 10 times with 200 ml washing buffer (50 mmol/l Tris-HCl, 150 mmol/l NaCl, and 1 Tween-20, pH 7.4) using a vacuum manifold (Millipore). The filter was dried and OptiPhase SuperMix (Perkin-Elmer Life Science, Boston, MA) was added to each well before the quantity of precipitated labeled protein was counted in a 1450 MicroBeta TriLux apparatus (Perkin-Elmer Life Science). All samples were measured in duplicate. The inter-assay coefficient of variation varied from 6.3 to 9.6 . The results were expressed as an antibody index and were calculated as follows:AntibodyIndex pmofthesampleserum{ pmofthenormalserum pmofthepositivestandardserum{ pmofthenormalpooledserumPET was performed as described previously [42] on a brain SHR12000 tomograph (Hamamatsu Photonics KK, Hamamatsu, Japan) having an intrinsic resolution of 2.962.963.4 scanner in full width at half maximum, 47 slices, and a 163-mm axial field of view. Two PET measurements using [11C](+)3-MPB and [11C]MP4A were performed sequentially at 3-hour intervals on the same day. The order of [11C](+)3-MPB and [11C]MP4A PET measurements were counterbalanced across subjects. The specific radioactivities of these ligands were found to be more than 50 GBq/mmol after synthesis of [11C](+)3-MPB and [11C]MP4A, respectively. After head fixation using a thermoplastic face mask, a 10-min transmission scan for attenuation correction was obtained. After a bolus injection of [11C](+)3-MPB (348.9657.2 MBq), serial PET scans were performed with a total duration of 92 min 23727046 (4630 sec, 2061 min, and 1465 min). After a bolus injection of [11C]MP4A (297.6653.8 MBq), serial PET scans were performed for a total of 62 min (4630 sec, 2061 min, and 865 min).PET Data AnalysisThe brain MRI was first co-registered to the PET image by pixel-wise kinetic modeling software (Pixel-Wise Kinetic Modeling Group, Zurich, Switzerland). The following ROIs were drawn bilaterally on the registered MR images; dorsolateral prefrontal cortex, anterior cingulate cortex, amygdala, occipital cortex, parietal cortex, temporal cortex, orbitofrontal cortex, thalamus and cerebellum. These ROIs were then transferred onto the corresponding dynamic [11C](+)3-MPB images and static [11C]MP4A image. For [11C](+)3-MPB analysis, the Logan reference tissue method was used in pixel-wise kinetic modeling software. In this study, the cerebellum was used as the reference region [51]. The Logan reference tissue method allows the estimation of the distribution volume ratio (DVR), which can be expressed as follows [52]: ROItar (t)dt=ROItar (T)|Commericial antibodies to human mAChR M1 (C-20) (Santa Cruz Biotechnology, Santa Cruz, CA) was used as the positiv.
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