Agonist Graph

Pr imaryantibodies were applied overnight at C and were detected using perox idaseconjugated secondaryantibodies.RESULTS E xpression of TN F and its receptors was examined in noni schemic andischemic Bicalutamide retinas of CBL mice.Retinalischemia was induced by increasing intraocular pressure for min, and retinas were analyzed and hr a fter reperfusion. TN F was found mainly in the inner retina,with a stronger expression in the ganglion cell layer. Within the latter, the staining was stronger in neurons such as amacrine cells close to the inner plex iform layer composed of photoreceptors. Signicant increase in TN F expression was obser ved a fter hr of reperfusion, in particular in GCL and, to a lesser ex tend, in I N L cells adjacent to the inner plex iform layer. These results ex tend prev ious data on induction of TN F a fter retinalischemia and identifythe cell layers capable of TN F expression.A fter hr of reperfusion, cells localized in the inner I N L and GCL showed a strong signal for both TN F receptortypes.Cr yosections of retinas from untreated orischemic CBL mice were analyzed by indi rect immunouorescence for TN F expression expression, respecti vely.At thistime point, only a few strongly staining cells were found in the GCL.Hi stological analyses of the Spermine neuronal damage were per formed inwt and knockout mice a fter dof physiological reperfusion. Asa parameter ofischemiainduced patholog y, neuronal cell death was determined by counting the nuclear densities in three di stinct retinal layers: ON L, I N L, and GCL.A fterischemia, each of the three mutant mouse strains di splayed a di stinct pattern of cell degeneration. In compari sonwithwt mice, TN FR mice di splayed no neuronal loss in the I N L. Unexpectedly, retinas from TN FR mice were more strongly a ffected byischemia than those fromwt mice, show ing an increased neuronal loss in all three cellular layers, suggesting a neuroprotecti ve role of TN FR for retinal neurons.Interestingly, in micewith a deletion of the TN F gene itsel f, the overall neuronal damage a fter retinalischemia was not signicantly different fromwt mice. The importance of TN FR in mediating neuronal cell death in vivois underlined by the absence of cell death in the different retinal layers of TN FR mice.ONL, outer nuclear layer; INL, inner nuclear layer; GCL, ganglion cell layer.Data are expressed as percentage reduction in neuronal cell number a fter dof reperfusion comparedwith noni schemic animals of the same mouse strain.A neuronal cell count was per formed on hi stological sections ofischemic retinas a fter dof reperfusion as well as on control retinas.In fact, our data do not rule out TN F actions on the vasculature, in particular those contributing to ti ssue damage.Akt PK B has been reported to play an important role in cell survi val pathways by inter fering at several levelswith proapoptotic signals. Neurosci L ett. A neuroprotecti ve role of TN F in a model of focal cerebralischemia was already suggested prev iously from datawith mice doubledecient for both TN F receptors.

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