Orexins A and B (ORA and ORB) are neuropeptide hormones found throughout the central nervous system and periphery. They are required for a host of physiological processes including mitogen-activated protein kinase (MAPK) regulation, steroidogenesis, appetite control and energy regulation. While some signalling mechanisms have been proposed for individual recombinant orexin receptors in generic mammalian cell types, it is clear that the peripheral effects of orexin are spatially and temporally complex. This study dissects the different G-protein signalling and MAPK pathways activated in a pluripotent human adrenal H295R cell line capable of all the physiological steps involved in steroidogenesis. Both extracellular receptor kinase 1/2 (ERK1/2) and p38 were phosphorylated rapidly with a subsequent decline, in a time-and dose-dependent manner, in response to both ORA and ORB. Conversely, there was little or no direct activation of the ERK5 or JNK pathway. Analysis using signalling and MAPK inhibitors as well as receptorspecific antagonists determined the precise mediators of the orexin response in these cells. Both ERK1/2 and p38 activation were predominantly G q -and to a lesser extent G s -mediated; p38 activation even had a small G i -component. Effects were broadly comparable for both orexin sub-types ORA and ORB and although most of the effects were transmitted through the orexin receptor-1 subtype, we did observe a role for orexin receptor-2-mediated activation of both ERK1/2 and p38. Cortisol secretion also differed in response to ORA and ORB. These data suggest multiple roles for orexin-mediated MAPK activation in an adrenal cell-line, this complexity may help to explain the diverse biological actions of orexins with wide-ranging consequences for our understanding of the mechanisms initiated by these steroidogenic molecules.
Background: Neurocysticercosis (NCC) is a common, widely prevalent parasitic infestation of the central nervous system in children of developing countries leading to neurological morbidities. Objectives: To study the variability of initial clinical presentations and brain imaging findings in children with NCC in the rural population of West Bengal. Methods: A retrospective analysis was done in the Department of Pediatric Medicine, Burdwan Medical College, Burdwan, India from August 2011 to August 2013. Results: Out of 952 admitted children with seizure, 113 children were diagnosed as having NCC (11.9%). Out of them, 62 (54.9%) were boys and 51 (45.1%) were girls. The age of presentation varied from 3 years to 12 years, with mean age 9.4 years. The commonest age of presentation was between 10 to 12 years (n=62; 54.9%). The maximum number of patients were from Burdwan district (n=72; 63.7%) followed by Birbhum (n=25; 22.1%). The commonest initial presentation with seizure (n=93; 82.3 %); partial seizure were present in 76 patients (81.7%). On brain imaging study, the commonest location of lesions was found in the parietal region (n=69; 61.1 %), the right parietal region being more common. Single lesions were found in 102 patients(90.3%). Conclusion: NCC is a major cause of neurological morbidity in children of developing nations and it should be suspected in any children presenting with a first episode of afebrile partial seizure. A screening brain imaging should be performed earlier to prevent undue mortality and morbidity.
Tooth eruption normally starts from 6 months of age. Teeth that appear at birth are called natal teeth, whereas, teeth that erupt during the first month of life are called neonatal teeth. Both are uncommon, with the ratio of natal to neonatal is 3:1. Presence of neonatal teeth may lead to complication in mother like painful bitten or bleeding nipples or it may cause complications in babies like difficulty in feeding, pain/distress due to erupting tooth, swallowing of the tooth, repeated trauma to the tip or undersurface of the tongue resulting in Riga-Fede ulceration and rarely aspiration. We are presenting a 15-day-old male baby who admitted at our hospital primarily with excessive crying and poor feeding and on a thorough physical examination revealed an erupting neonatal tooth. Other causes of excessive crying have been excluded.DOI: http://dx.doi.org/10.3126/ajms.v6i4.11241 Asian Journal of Medical Sciences Vol.6(4) 2015 87-88
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