LIM-homeodomain gene Lhx2 regulates the formation of the cortical hem.

We are interested in the early mechanisms that initiate regional patterning in the dorsal telencephalon, which gives rise to cerebral cortex. Members of the LIM-homeodomain (LIM-HD) family of transcription factors are implicated in patterning and cell fate specification in several systems including the mammalian forebrain. Mice in which Lhx2 is disrupted were reported to have reduced telencephalic development, and the hippocampal primordium appeared to be missing, by morphological observation. We hypothesized that this may be due to a defect in the cortical hem, a Wnt- and Bmp-rich putative signaling center in the medial telencephalon, a source of regulatory signals for hippocampal development. We asked if the expression of any known hem-specific signaling molecule is deficient in Lhx2-/- mice. Our results reveal, unexpectedly, that at embryonic day (E)12.5, what appears to be some spared 'lateral' cortex is instead an expanded cortical hem. Normally restricted to the extreme medial edge of the telencephalon, the hem covers almost the entire dorsal telencephalon in the Lhx2-/- mice. This indicates a role for Lhx2 in the regulation of the extent of the cortical hem. In spite of an expanded, mislocated hem in the Lhx2-/- telencephalon, a potential source of ectopic dorsalizing cues, no hippocampal differentiation is detected in tissue adjacent to the mutant hem, nor does the overall dorsoventral patterning appear perturbed. We propose that Lhx2 is involved at a crucial early step in patterning the telencephalon, where the neuroepithelium is first divided into presumptive cortical tissue, and the cortical hem. The defect in the Lhx2-/- telencephalon appears to be at this step.

Evaluation of the efficacy and safety of azathioprine (Azoran), in fresh cases of renal homotransplantation.

In a randomised, controlled study, the efficacy and safety of an indigenously developed azathioprine formulation, Azoran/1000 (Searle), was compared with an imported formulation Imuran, as an immunosuppressive agent in fresh cases of renal transplantation. All 14 patients enrolled into the trial completed the study period were analysed. There were 8 episodes of rejection, 4 in each group. All these cases responded to pulse steroids. There was no instance of severe bone marrow suppression or hepatitis in either group and none of the patients had any drug related adverse effects. The results of this study show that Azoran is equiefficacious and safe as an immunosuppressive drug in renal transplants and compares satisfactorily in all respects with the imported formulation Imuran and has the added advantage of being easily available and less costly.

Protein intake in Indian haemodialysis patients.

OBJECTIVES: Aim of our study was to find out the amount of protein consumed by Indian haemodialysis patients. METHODS: Twenty patients with endstage renal disease on regular haemodialysis at a major urban dialysis centre in India had their Kt/V and nPCR measured monthly for 4 months utilising urea kinetic methods. RESULTS: Despite an adequate amount of dialysis per session being delivered to almost all of these patients (19 out of 20 had a Kt/V greater than 1.2) none of our patients had an nPCR greater than 1 gm/kg/day and only 4 patients i.e. 20% had a protein intake greater than 0.8 gm/kg/day which is a cut off point below which mortality has been shown to increase dramatically. Most of the patients had a protein intake between 0.7-0.8 gm/kg/day which is alarmingly low. Patients who consumed non vegetarian food at least thrice a week did appear to have a significantly higher protein intake compared to the rest of the patients. CONCLUSION: We believe that these results are likely to be representative of other dialysis centers in India and that an intensive effort at dietary education aimed at increasing the protein intake in our haemodialysis patients is urgently required. The morbidity and mortality of dialysis patients is high and perhaps appropriate dietary intervention can help to reduce this.