The aim of this study was to investigate the relationship between cell cycle reentry and apoptosis in cultured cortical neurons following oxygen-glucose deprivation (OGD). We found that the percentage of neurons with BrdU uptake, TUNEL staining, and colocalized BrdU uptake and TUNEL staining was increased relative to control 6, 12 and 24 h after 1 h of OGD. The number of neurons with colocalized BrdU and TUNEL staining was decreased relative to the number of TUNEL-positive neurons at 24 h. The expression of phosphorylated retinoblastoma protein (phospho-Rb) was significantly increased 6, 12 and 24 h after OGD, parallel with the changes in BrdU uptake. Phospho-Rb and TUNEL staining were colocalized in neurons 6 and 12 h after OGD. This colocalization was strikingly decreased 24 h after OGD. Treatment with the cyclin-dependent kinase inhibitor roscovitine (100 μM) decreased the expression of phospho-Rb and reduced neuronal apoptosis in vitro. These results demonstrated that attempted cell cycle reentry with phosphorylation of Rb induce early apoptosis in neurons after OGD and there must be other mechanisms involved in the later stages of neuronal apoptosis besides cell cycle reentry. Phosphoralated Rb may be an important factor which closely associates aberrant cell cycle reentry with the early stages of neuronal apoptosis following ischemia/hypoxia in vitro, and pharmacological interventions for neuroprotection may be useful directed at this keypoint.

Background: Background activity on fluorine-18-fluorodeoxyglucose ( 18 F-FDG) positron emission tomography/computed tomography (PET/CT) is often used as a reference to assess a patient's response to tumor treatment. To produce a suitable background activity reference, we examined the variations in standardized uptake values (SUVs) in the blood pool and liver of a large multi-aged population.Methods: A total of 2,526 subjects underwent 18 F-FDG PET/CT examinations and were divided into 12 age groups. Pearson's partial correlation and multivariate regression analyses were performed to assess the associations between individual factors and SUVs of the blood pool and liver and to identify the factor that most influenced the SUVs. The mean SUVs across the age groups were also determined.Results: Positive correlations were found between individual factors and SUVs. Age appeared to be the most important predictor of SUVs and was significantly associated with the blood pool SUV max (ß=0.466, P=0.000), blood pool SUV mean (ß=0.393, P=0.000), liver SUV max (ß=0.347, P=0.000), and liver SUV mean (ß=0.354, P=0.000). Blood pool and liver SUVs rose rapidly until the age of 20 and then showed a slow upward trend without reaching a plateau. Conclusions:Age is an important factor that influences variations in the blood pool and liver SUVs. Our study clarified this understanding of age-related variations in SUVs and provided a normal range of blood pool and liver SUVs that may aid clinicians in evaluating tumors with greater accuracy.

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Rationale:Ulcerative colitis is a chronic and recurrent inflammatory disease involving the intestine. It is reported that about 40% of patients with ulcerative colitis have extraintestinal manifestations, where as the literature on neurological involvement as extraintestinal manifestation is rather limited. Guillain-Barré syndrome is an abnormal immune-mediated and acute-acquired demyelinating disease that mainly affects the peripheral nervous system and often has a phenomenon of protein-cell separation of cerebrospinal fluid. Here, we report a rare case of ulcerative colitis with Guillain-Barré Syndrome.Patient concerns:We described a patient with Guillain-Barré syndrome during the remission period of ulcerative colitis. Clinical manifestations are the numbness of the upper extremities, weakness in the limbs and the inability of the fingers companion. Cerebrospinal fluid (CSF) showed albuminocytological dissociation and electromyography suggested neurogenic lesion.Diagnoses:Ulcerative colitis with Guillain-Barré syndrome was diagnosed based on the history of ulcerative colitis, related symptoms, typical cerebrospinal fluid albuminocytological dissociation and evidence of neurogenic injury through electromyography.Interventions:The patient was treated with intravenous (IV) methylprednisolone.Outcomes:After the treatment of glucocorticoid, the symptoms of the nervous system were disappeared.Lessons:Neurological involvement of extraintestinal manifestation during the remission period of ulcerative colitis also exists in the clinic. This case highlights the need for diagnostic vigilance in cases of ulcerative colitis involving the peripheral nerves during the remission period. We recommend cerebrospinal fluid examination and electromyography in view of rare but serious possibility of Guillain-Barré syndrome.