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Articles by B Mishra
Total Records ( 2 ) for B Mishra
  A Mehanna , B Mishra , N Kurschat , C Schulze , S Bian , G Loers , A Irintchev and M. Schachner
 

2,8 Polysialic acid (PSA) is a carbohydrate attached to the glycoprotein backbone of the neural cell adhesion molecule (NCAM) and implicated in nervous system development and repair. Here, we investigated whether PSA can improve functional recovery after peripheral nerve lesion in adult mice. We applied a functional PSA mimicking peptide or a control peptide in a polyethylene cuff used to surgically reconnect the severed stumps of the femoral nerve before it bifurcates into the motor and sensory branches. Using video-based motion analysis to monitor motor recovery over a 3 month postoperative period, we observed a better functional outcome in the PSA mimetic-treated than in control mice receiving a control peptide or phosphate buffered saline. Retrograde tracing of regenerated motoneurons and morphometric analyses showed that motoneuron survival, motoneuron soma size and axonal diameters were not affected by treatment with the PSA mimetic. However, remyelination of regenerated axons distal to the injury site was considerably improved by the PSA mimetic indicating that effects on Schwann cells in the denervated nerve may underlie the functional effects seen in motor recovery. In line with this notion was the observation that the PSA mimetic enhanced the elongation of Schwann cell processes and Schwann cell proliferation in vitro, when compared with the control peptide. Moreover, Schwann cell proliferation in vivo was enhanced in both motor and sensory branches of the femoral nerve by application of the PSA mimetic. These effects were likely mediated by NCAM through its interaction with the fibroblast growth factor receptor (FGFR), since they were not observed when the PSA mimetic was applied to NCAM-deficient Schwann cells, and since application of two different FGFR inhibitors reduced process elongation from Schwann cells in vitro. Our results indicate the potential of PSA mimetics as therapeutic agents promoting motor recovery and myelination after peripheral nerve injury.

  D. Shukla , S. Chakraborty , S. Singh and B Mishra
  Background and the purpose of the study: This investigation deals with risperidone cyclodextrin (CD) complexation for parenteral administration to improve its aqueous solubility which would be beneficial over immediate and sustained release formulations available in market especially for agitated and non-cooperative psychotic patients.
Methods: The phase solubility study of the drug with β-CD, hydroxypropyl (HP)-β-CD and γ-CD was conducted and CDs with higher stability constants were selected for complexation. The complexes of Risperidone with β-CD and HP-β-CD were prepared by precipitation and vacuum drying methods, respectively. Fourier transform-infrared, X-ray diffraction and differential scanning calorimetry techniques were used for characterization of complexes. Drug precipitation study of complex's solution in water for injection and 100 ml of 0.1 M pH 7.4 phosphate buffer saline and stability study in accelerated condition were also carried out.
Results: The stability constants of the CD were in the following order: β-CD (341.953±11.87 M-1) > HP-β-CD (170.817± 5.93 M-1) > γ-CD (93.716 ± 3.25 M-1). CDs with high stability constants were selected to prepare the drug CD complex. The complexation efficiencies of β-CD and HP-β-CD were 95.23 ± 2.27% and 97.59 ±1.97%, respectively. Both types of CDs exhibited complexation at 1:2 molar stoichiometric ratio. The drug precipitation study indicated complete solubility (100% drug dissolution) without a trace of precipitate within 5 mins. The complexes were found to be stable for a period of 3 months under accelerated stability conditions.
Major conclusion: Stable complexes of risperidone were successfully formulated using both β-CD and HP-β-CD by simple and highly efficient methods of complexation for parenteral administration.
 
 
 
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