Mechanistic insight into high-fat diet-induced metabolic inflammation in the arcuate nucleus of the hypothalamus.

A high-fat diet (HFD) is linked with cytokines production by non-neuronal cells within the hypothalamus, which mediates metabolic inflammation. These cytokines then activate different inflammatory mediators in the arcuate nucleus of the hypothalamus (ARC), a primary hypothalamic area accommodating proopiomelanocortin (POMC) and agouti-related peptide (AGRP) neurons, first-order neurons that sense and integrate peripheral metabolic signals and then respond accordingly. These mediators, such as inhibitor of κB kinase-ß (IKKß), suppression of cytokine signaling 3 (SOCS3), c-Jun N-terminal kinases (JNKs), protein kinase C (PKC), etc., cause insulin and leptin resistance in POMC and AGRP neurons and support obesity and related metabolic complications. On the other hand, inhibition of these mediators has been shown to counteract the impaired metabolism. Therefore, it is important to discuss the contribution of neuronal and non-neuronal cells in HFD-induced hypothalamic inflammation. Furthermore, understanding few other questions, such as the diets causing hypothalamic inflammation, the gender disparity in response to HFD feeding, and how hypothalamic inflammation affects ARC neurons to cause impaired metabolism, will be helpful for the development of therapeutic approaches to prevent or treat HFD-induced obesity.

Intraventricular injection of 5,7-dihydroxytryptamine alters neuronal activity of neurons in the medial prefrontal cortex of rat / 生理学报

The present study is aimed to investigated the firing activity of pyramidal neurons and interneurons in the medial prefrontal cortex (mPFC) in rats with bilateral intraventricular injection of 5,7-dihydroxytryptamine (5,7-DHT) by using in vivo extracellular recording. The results showed that the injection of 5,7-DHT reduced the 5-hydroxytryptamine (5-HT) levels in the mPFC and dorsal raphe nucleus in the rats. The firing rate of mPFC pyramidal neurons in rats with 5,7-DHT injection was significantly higher than that of normal rats, and the firing pattern of these neurons also changed significantly towards a more burst-firing, while the injection decreased the firing rate of mPFC interneurons and changed the firing pattern of the interneurons towards a more irregular. These results indicate that the lesions of the serotonergic neurons lead to the changes in the firing activity of mPFC pyramidal neurons and interneurons, suggesting that serotonergic system plays an important role in the regulation of the neuronal activity in the mPFC.

Clinical analysis of intracranial hemorrhage in children with hemophilia / 中华实用儿科临床杂志

Objective To discuss the risk factors,clinical characteristics,treatment protocol and prognosis of intracranial hemorrhage (ICH) in children with hemophilia.Methods Twenty-four hemophilic children with ICH,which were registered in hospital between Jan.2005 and Dec.2012,were reviewed retrospectively.Results (1) Fifteen patients were hemophilia A and 9 patients were hemophilia B,all boys.The mean age of ICH was 1 year and 7 months old.The 70.8％ of patients were less than 3 years old,among whom hemophilia was diagnosed after ICH in more than 88.9％.The 87.5％ of patients had moderate or severe disease,and 37.5％ had head trauma before ICH.(2) The clinical symptoms were high cranial pressure,anemia,disturbance of consciousness,seizure,hemiplegia.(3) ICH position:cerebral hemorrhage with subarachnoid hemorrhage (SAH) in 7 patients,ventricular hemorrhage 2 patients,subdural hemorrhage with SAH in 10 patients,extradural hemorrhage 5 patients.(4)All patients were given blood coagulation factor replacement therapy,5 patients by operation.(5)Thirteen patients had not sequelae,9 patients had sequelae and 2 patients died.Conclusions The risk factors of ICH in hemophilic children include ages less than 3 years old,moderate or severe disease.Some patients have no predispositions.The clinical symptoms of patients are similar with normal children suffering from ICH.The keys of treatment are early diagnosis,early treatment and adequate course of treatment.Surgical operation could be in treatment after coagulation function gets corrected back to normal.