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Expression and immunolocalization of Gpnmb, a glioma-associated glycoprotein, in normal and inflamed central nervous systems of adult rats.

Huang JJ, Ma WJ, Yokoyama S - Brain Behav (2012)

Bottom Line: Double immunofluorescence staining showed that these cells were co-stained most frequently with the microglia/macrophage marker OX42, and occasionally with the radial glia marker RC2 or the neuronal marker NeuN.Furthermore, an intraperitoneal injection of bacterial endotoxin lipopolysaccharide increased the number of Gpnmb and OX42 double-positive cells in the area postrema, which is one of the circumventricular organs, indicating infiltration of hematogenous macrophages.These results suggest that Gpnmb, which is expressed in microglia and macrophages in non-tumorous neural tissues, plays an important role in the regulation of immune/inflammatory responses.

View Article: PubMed Central - PubMed

Affiliation: Department of Biophysical Genetics, Kanazawa University Graduate School of Medicine Kanazawa 920-8640, Japan.

ABSTRACT
Glycoprotein nonmetastatic melanoma B (Gpnmb) is a type I transmembrane protein implicated in cell differentiation, inflammation, tissue regeneration, and tumor progression. Gpnmb, which is highly expressed in glioblastoma cells, is a potential therapeutic target. However, little is known about its expression, cellular localization, and roles in non-tumorous neural tissues. In this study, we examined Gpnmb expression in the central nervous system of adult rats under both normal and inflammatory conditions. Reverse transcription-polymerase chain reaction analysis revealed that Gpnmb mRNA was expressed in the cerebrum, cerebellum, brain stem, and spinal cord of normal adult rats. Immunoperoxidase staining revealed that Gpnmb-immunoreactive cells were widely distributed in the parenchyma of all brain regions examined, with the cells being most prevalent in the hippocampal dentate gyrus, cerebellar cortex, spinal dorsal horn, choroid plexus, ependyma, periventricular regions, and in layers II and III of the cerebral cortex. Double immunofluorescence staining showed that these cells were co-stained most frequently with the microglia/macrophage marker OX42, and occasionally with the radial glia marker RC2 or the neuronal marker NeuN. Furthermore, an intraperitoneal injection of bacterial endotoxin lipopolysaccharide increased the number of Gpnmb and OX42 double-positive cells in the area postrema, which is one of the circumventricular organs, indicating infiltration of hematogenous macrophages. These results suggest that Gpnmb, which is expressed in microglia and macrophages in non-tumorous neural tissues, plays an important role in the regulation of immune/inflammatory responses.

No MeSH data available.


Related in: MedlinePlus

Characterization of Gpnmb-IR cells in the hippocampal dentate gyrus. Sections were double-stained for Gpnmb (green) and the indicated markers (red). Note that Gpnmb-IR cells were co-stained with OX42, IB4, or NeuN (arrows). Scale bars: A, 10 μm; B–E, 30 μm.
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fig06: Characterization of Gpnmb-IR cells in the hippocampal dentate gyrus. Sections were double-stained for Gpnmb (green) and the indicated markers (red). Note that Gpnmb-IR cells were co-stained with OX42, IB4, or NeuN (arrows). Scale bars: A, 10 μm; B–E, 30 μm.

Mentions: Gpnmb-IR was observed throughout the hippocampus (Fig. 5A). IR was abolished by the primary antibody that was preadsorbed with the peptide used for immunization (Fig. 5B). IR in the CA1 segment (Fig. 5C) and dentate gyrus (Fig. 5F) was stronger than that observed in the CA2 and CA3 segments (Fig. 5D, E). With double fluorescence staining, Gpnmb-IR cells co-stained with OX42 or IB4 were observed in the polymorphic cell layer (Fig. 6A, B), but no co-staining with GFAP or NG2 was observed (Fig. 6C, D). A fraction of Gpnmb-IR cells in the granule cell layer of the dentate gyrus was positive for NeuN (Fig. 6E).


Expression and immunolocalization of Gpnmb, a glioma-associated glycoprotein, in normal and inflamed central nervous systems of adult rats.

Huang JJ, Ma WJ, Yokoyama S - Brain Behav (2012)

Characterization of Gpnmb-IR cells in the hippocampal dentate gyrus. Sections were double-stained for Gpnmb (green) and the indicated markers (red). Note that Gpnmb-IR cells were co-stained with OX42, IB4, or NeuN (arrows). Scale bars: A, 10 μm; B–E, 30 μm.
© Copyright Policy
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3345354&req=5

fig06: Characterization of Gpnmb-IR cells in the hippocampal dentate gyrus. Sections were double-stained for Gpnmb (green) and the indicated markers (red). Note that Gpnmb-IR cells were co-stained with OX42, IB4, or NeuN (arrows). Scale bars: A, 10 μm; B–E, 30 μm.
Mentions: Gpnmb-IR was observed throughout the hippocampus (Fig. 5A). IR was abolished by the primary antibody that was preadsorbed with the peptide used for immunization (Fig. 5B). IR in the CA1 segment (Fig. 5C) and dentate gyrus (Fig. 5F) was stronger than that observed in the CA2 and CA3 segments (Fig. 5D, E). With double fluorescence staining, Gpnmb-IR cells co-stained with OX42 or IB4 were observed in the polymorphic cell layer (Fig. 6A, B), but no co-staining with GFAP or NG2 was observed (Fig. 6C, D). A fraction of Gpnmb-IR cells in the granule cell layer of the dentate gyrus was positive for NeuN (Fig. 6E).

Bottom Line: Double immunofluorescence staining showed that these cells were co-stained most frequently with the microglia/macrophage marker OX42, and occasionally with the radial glia marker RC2 or the neuronal marker NeuN.Furthermore, an intraperitoneal injection of bacterial endotoxin lipopolysaccharide increased the number of Gpnmb and OX42 double-positive cells in the area postrema, which is one of the circumventricular organs, indicating infiltration of hematogenous macrophages.These results suggest that Gpnmb, which is expressed in microglia and macrophages in non-tumorous neural tissues, plays an important role in the regulation of immune/inflammatory responses.

View Article: PubMed Central - PubMed

Affiliation: Department of Biophysical Genetics, Kanazawa University Graduate School of Medicine Kanazawa 920-8640, Japan.

ABSTRACT
Glycoprotein nonmetastatic melanoma B (Gpnmb) is a type I transmembrane protein implicated in cell differentiation, inflammation, tissue regeneration, and tumor progression. Gpnmb, which is highly expressed in glioblastoma cells, is a potential therapeutic target. However, little is known about its expression, cellular localization, and roles in non-tumorous neural tissues. In this study, we examined Gpnmb expression in the central nervous system of adult rats under both normal and inflammatory conditions. Reverse transcription-polymerase chain reaction analysis revealed that Gpnmb mRNA was expressed in the cerebrum, cerebellum, brain stem, and spinal cord of normal adult rats. Immunoperoxidase staining revealed that Gpnmb-immunoreactive cells were widely distributed in the parenchyma of all brain regions examined, with the cells being most prevalent in the hippocampal dentate gyrus, cerebellar cortex, spinal dorsal horn, choroid plexus, ependyma, periventricular regions, and in layers II and III of the cerebral cortex. Double immunofluorescence staining showed that these cells were co-stained most frequently with the microglia/macrophage marker OX42, and occasionally with the radial glia marker RC2 or the neuronal marker NeuN. Furthermore, an intraperitoneal injection of bacterial endotoxin lipopolysaccharide increased the number of Gpnmb and OX42 double-positive cells in the area postrema, which is one of the circumventricular organs, indicating infiltration of hematogenous macrophages. These results suggest that Gpnmb, which is expressed in microglia and macrophages in non-tumorous neural tissues, plays an important role in the regulation of immune/inflammatory responses.

No MeSH data available.


Related in: MedlinePlus