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Protective effect of 14-3-3 antibodies on stressed neuroretinal cells via the mitochondrial apoptosis pathway.

Bell K, Wilding C, Funke S, Pfeiffer N, Grus FH - BMC Ophthalmol (2015)

Bottom Line: We found significant effects of serum antibodies on proteins of neuroretinal cells especially of the mitochondrial apoptosis pathway.The changed autoantibodies belong to the natural autoimmunity.We conclude that changes in the natural autoimmunity of patients with glaucoma can negatively impact regulatory functions.

View Article: PubMed Central - PubMed

Affiliation: Experimental Ophthalmology, Department of Ophthalmology, University Medical center of the Johannes Gutenberg University, Langenbeckstraße 1, 55131, Mainz, Germany. kbell@eye-research.org.

ABSTRACT

Background: Previous studies demonstrate changes of autoantibody concentrations against retinal and optic nerve head antigens in the serum of glaucoma patients in comparison to healthy persons. These antibodies belong to the natural autoimmunity. Previous studies showed up regulated, but also significantly down-regulated autoantibody levels. These antibodies have the ability to influence protein profiles of neuroretinal cells and possibly hold neuroprotective potential, as we have been able to demonstrate before. Aim of this study was to analyse the serum and antibody effect of glaucoma patients on neuroretinal cells in more detail and also determine the impact of antibodies found down-regulated in glaucoma patients on the pathogenesis of the neurodegenerative disease glaucoma.

Methods: Neuroretinal cells (RGC-5) were incubated with serum either from glaucoma patients or healthy controls for 24 h. Mass spectrometric analysis was performed after cell lysis. Furthermore the neuroretinal cells were preincubated with different and concentrations of 14-3-3 antibodies (0.005, 0.1, 0.5, 1, 5 and 10 μg/ml) and then stressed with H2O2, staurosporine or glutamate. Viability tests were performed with crystal violet and ROS tests with DCFH-DA. Antibody location in the cell after antibody incubation was performed with immunocytochemical methods. Additionally mass spectrometric analysis was performed with the cells after antibody incubation.

Results: Protein expression analysis with Maldi-Orbitrap MS showed changes in the expression level of regulatory proteins in cells incubated with glaucoma serum, e.g. an up-regulation of 14-3-3 and a down-regulation of Calmodulin. After preincubation of the cells with anti-14-3-3 antibody and stressing the cells, we detected an increase in viability of up to 22 % and a decrease in reactive oxygen species (ROS) of up to 31 %. Proteomic 1 analysis involvement of the mitochondrial apoptosis pathway in this protective effect and immunohistochemical analysis showed an antibody uptake in the cells.

Conclusion: We found significant effects of serum antibodies on proteins of neuroretinal cells especially of the mitochondrial apoptosis pathway. Furthermore we detected a protective potential of antibodies down-regulated in glaucoma patients. The changed autoantibodies belong to the natural autoimmunity. We conclude that changes in the natural autoimmunity of patients with glaucoma can negatively impact regulatory functions.

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Related in: MedlinePlus

Viability of glutamate and staurosporine stressed RGC-5 upon 14-3-3 sigma antibody treatment. RGC-5 were preincubated with different 14-3-3 antibody concentrations and additionally stressed with 20 mM glutamate for 24 h, or 1.5 μM stauorsporine for 5 h. Cell viability was determined using crystal violet and expressed as percent of the control cells + the stress factor (glutamate or staurosporine) (* = p < 0.05; **p < 0.01). N in each experimental group is 4. a: Increased highly significant and significant cell viability of up to 7 % was demonstrated after the cells were preincubated with 0.5, 1 μg/ml 14-3-3 sigma antibodies and additionally stressed with staurosporine. b: Increased cell viability in a range of 0.05-5 μg/ml 14-3-3 antibodies were obtained after the cells were stressed with glutamate, whereby the result of 0.5 μg/ml is highly significant and of 1.5 μg/ml is significant. We were able to detect an increase of viability of up to 12 %
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Fig4: Viability of glutamate and staurosporine stressed RGC-5 upon 14-3-3 sigma antibody treatment. RGC-5 were preincubated with different 14-3-3 antibody concentrations and additionally stressed with 20 mM glutamate for 24 h, or 1.5 μM stauorsporine for 5 h. Cell viability was determined using crystal violet and expressed as percent of the control cells + the stress factor (glutamate or staurosporine) (* = p < 0.05; **p < 0.01). N in each experimental group is 4. a: Increased highly significant and significant cell viability of up to 7 % was demonstrated after the cells were preincubated with 0.5, 1 μg/ml 14-3-3 sigma antibodies and additionally stressed with staurosporine. b: Increased cell viability in a range of 0.05-5 μg/ml 14-3-3 antibodies were obtained after the cells were stressed with glutamate, whereby the result of 0.5 μg/ml is highly significant and of 1.5 μg/ml is significant. We were able to detect an increase of viability of up to 12 %

Mentions: An increased cell viability of 22 % (p < 0.01) was measured after preincubation of the cells with 10 μg/ml 14-3-3 ab and additional stress with H2O2 (Fig. 3), as well as a significantly decreased ROS-production of 31 % (p < 0.01) (Fig. 3). We could indicate a significantly increased viability of 12 % (p < 0.01) when incubating the cells with 0.5 μg/ml 14-3-3 ab and of 7 % (p < 0.05) when incubating the cells with 1 μg/ml 14-3-3 ab and stressing with staurosporine (Fig. 4a).Fig. 3


Protective effect of 14-3-3 antibodies on stressed neuroretinal cells via the mitochondrial apoptosis pathway.

Bell K, Wilding C, Funke S, Pfeiffer N, Grus FH - BMC Ophthalmol (2015)

Viability of glutamate and staurosporine stressed RGC-5 upon 14-3-3 sigma antibody treatment. RGC-5 were preincubated with different 14-3-3 antibody concentrations and additionally stressed with 20 mM glutamate for 24 h, or 1.5 μM stauorsporine for 5 h. Cell viability was determined using crystal violet and expressed as percent of the control cells + the stress factor (glutamate or staurosporine) (* = p < 0.05; **p < 0.01). N in each experimental group is 4. a: Increased highly significant and significant cell viability of up to 7 % was demonstrated after the cells were preincubated with 0.5, 1 μg/ml 14-3-3 sigma antibodies and additionally stressed with staurosporine. b: Increased cell viability in a range of 0.05-5 μg/ml 14-3-3 antibodies were obtained after the cells were stressed with glutamate, whereby the result of 0.5 μg/ml is highly significant and of 1.5 μg/ml is significant. We were able to detect an increase of viability of up to 12 %
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4482181&req=5

Fig4: Viability of glutamate and staurosporine stressed RGC-5 upon 14-3-3 sigma antibody treatment. RGC-5 were preincubated with different 14-3-3 antibody concentrations and additionally stressed with 20 mM glutamate for 24 h, or 1.5 μM stauorsporine for 5 h. Cell viability was determined using crystal violet and expressed as percent of the control cells + the stress factor (glutamate or staurosporine) (* = p < 0.05; **p < 0.01). N in each experimental group is 4. a: Increased highly significant and significant cell viability of up to 7 % was demonstrated after the cells were preincubated with 0.5, 1 μg/ml 14-3-3 sigma antibodies and additionally stressed with staurosporine. b: Increased cell viability in a range of 0.05-5 μg/ml 14-3-3 antibodies were obtained after the cells were stressed with glutamate, whereby the result of 0.5 μg/ml is highly significant and of 1.5 μg/ml is significant. We were able to detect an increase of viability of up to 12 %
Mentions: An increased cell viability of 22 % (p < 0.01) was measured after preincubation of the cells with 10 μg/ml 14-3-3 ab and additional stress with H2O2 (Fig. 3), as well as a significantly decreased ROS-production of 31 % (p < 0.01) (Fig. 3). We could indicate a significantly increased viability of 12 % (p < 0.01) when incubating the cells with 0.5 μg/ml 14-3-3 ab and of 7 % (p < 0.05) when incubating the cells with 1 μg/ml 14-3-3 ab and stressing with staurosporine (Fig. 4a).Fig. 3

Bottom Line: We found significant effects of serum antibodies on proteins of neuroretinal cells especially of the mitochondrial apoptosis pathway.The changed autoantibodies belong to the natural autoimmunity.We conclude that changes in the natural autoimmunity of patients with glaucoma can negatively impact regulatory functions.

View Article: PubMed Central - PubMed

Affiliation: Experimental Ophthalmology, Department of Ophthalmology, University Medical center of the Johannes Gutenberg University, Langenbeckstraße 1, 55131, Mainz, Germany. kbell@eye-research.org.

ABSTRACT

Background: Previous studies demonstrate changes of autoantibody concentrations against retinal and optic nerve head antigens in the serum of glaucoma patients in comparison to healthy persons. These antibodies belong to the natural autoimmunity. Previous studies showed up regulated, but also significantly down-regulated autoantibody levels. These antibodies have the ability to influence protein profiles of neuroretinal cells and possibly hold neuroprotective potential, as we have been able to demonstrate before. Aim of this study was to analyse the serum and antibody effect of glaucoma patients on neuroretinal cells in more detail and also determine the impact of antibodies found down-regulated in glaucoma patients on the pathogenesis of the neurodegenerative disease glaucoma.

Methods: Neuroretinal cells (RGC-5) were incubated with serum either from glaucoma patients or healthy controls for 24 h. Mass spectrometric analysis was performed after cell lysis. Furthermore the neuroretinal cells were preincubated with different and concentrations of 14-3-3 antibodies (0.005, 0.1, 0.5, 1, 5 and 10 μg/ml) and then stressed with H2O2, staurosporine or glutamate. Viability tests were performed with crystal violet and ROS tests with DCFH-DA. Antibody location in the cell after antibody incubation was performed with immunocytochemical methods. Additionally mass spectrometric analysis was performed with the cells after antibody incubation.

Results: Protein expression analysis with Maldi-Orbitrap MS showed changes in the expression level of regulatory proteins in cells incubated with glaucoma serum, e.g. an up-regulation of 14-3-3 and a down-regulation of Calmodulin. After preincubation of the cells with anti-14-3-3 antibody and stressing the cells, we detected an increase in viability of up to 22 % and a decrease in reactive oxygen species (ROS) of up to 31 %. Proteomic 1 analysis involvement of the mitochondrial apoptosis pathway in this protective effect and immunohistochemical analysis showed an antibody uptake in the cells.

Conclusion: We found significant effects of serum antibodies on proteins of neuroretinal cells especially of the mitochondrial apoptosis pathway. Furthermore we detected a protective potential of antibodies down-regulated in glaucoma patients. The changed autoantibodies belong to the natural autoimmunity. We conclude that changes in the natural autoimmunity of patients with glaucoma can negatively impact regulatory functions.

Show MeSH
Related in: MedlinePlus