Document Information


PMID 17719032  (  )
Title Intrathecal infusion of a Ca(2+)-permeable AMPA channel blocker slows loss of both motor neurons and of the astrocyte glutamate transporter, GLT-1 in a mutant SOD1 rat model of ALS.
Abstract Elevated extracellular glutamate, resulting from a loss of astrocytic glutamate transport capacity, may contribute to excitotoxic motor neuron (MN) damage in ALS. Accounting for their high excitotoxic vulnerability, MNs possess large numbers of unusual Ca(2+)-permeable AMPA channels (Ca-AMPA channels), the activation of which triggers mitochondrial Ca(2+) overload and strong reactive oxygen species (ROS) generation. However, the causes of the astrocytic glutamate transport loss remain unexplained. To assess the role of Ca-AMPA channels on the evolution of pathology in vivo, we have examined effects of prolonged intrathecal infusion of the Ca-AMPA channel blocker, 1-naphthyl acetylspermine (NAS), in G93A transgenic rat models of ALS. In wild-type animals, immunoreactivity for the astrocytic glutamate transporter, GLT-1, was particularly strong around ventral horn MNs. However, a marked loss of ventral horn GLT-1 was observed, along with substantial MN damage, prior to onset of symptoms (90-100 days) in the G93A rats. Conversely, labeling with the oxidative marker, nitrotyrosine, was increased in the neuropil surrounding MNs in the transgenic animals. Compared to sham-treated G93A animals, 30-day NAS infusions (starting at 67+/-2 days of age) markedly diminished the loss of both MNs and of astrocytic GLT-1 labeling. These observations are compatible with the hypothesis that activation of Ca-AMPA channels on MNs contributes, likely in part through oxidative mechanisms, to loss of glutamate transporter in surrounding astrocytes.

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Targets by SciMiner Summary

HUGO ID Symbol Target Name #Occur ActualStr
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 257GLT-1 | excitatory amino acid transporter 2 | glt 1 |
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))14SOD1 | superoxide dismutase |
4235GFAPglial fibrillary acidic protein12GFAP-positive | glial fibrillary acidic protein |
4571GRIA1glutamate receptor, ionotropic, AMPA 11glutamate receptor |

 


Targets by SciMiner Full list

HUGO ID Symbol Name ActualStr Score FlankingText
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0In wild-type animals immunoreactivity for the astrocytic glutamate transporter GLT-1 was particularly strong around ventral horn MNs
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0However a marked loss of ventral horn GLT-1 was observed along with substantial MN damage prior to onset
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0markedly diminished the loss of both MNs and of astrocytic GLT-1 labeling
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0resulting from a selective loss of the astrocytic glutamate transporter GLT-1 suggested an excitotoxic contribution ( Rothstein et al. 1992 and
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))SOD11.4mutant forms of the enzyme Cu Zn superoxide dismutase (SOD1), SOD1 which are associated with familial ALS in humans
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))SOD11.4indicate that the rate of progression of MN loss in SOD1 mutant mice varies bidirectionally with the level of expression of
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))SOD11.4in a distinct form of familial ALS not linked to SOD1 ( Lai et al. 2006 and a Ca-AMPA channel blocker
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))SOD11.4Ca-AMPA channel blocker 1-naphthyl acetylspermine (NAS) NAS in G93A transgenic SOD1 rats
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0loss in these animals but also slows the loss of GLT-1 glutamate transporter in ventral horn regions near MNs consistent with
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))SOD11.4Male hemizygous SOD1 G93A transgenic rats [Tac:N:(SD)-TgN(SOD1G93A)L26H, Tac N SD -TgN SOD1G93A L26H
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.01 8000 ip 1 2000 if Sternberger Monoclonals Berkeley CA GLT-1 1 1000 Chemicon Temecula CA 3-nitrotyrosine 10_amp_#xa0;_amp_#x3bc;g/ml, 10_amp_#xa0 _amp_#x3bc g
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0For examination of NT and GLT-1 labeling staining in the neuropil surrounding ventral horn MNs care
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0For GLT-1 fluorescence was measured in 5-_amp_#x3bc m zones surrounding the MNs
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0from the center of a neuron a region lacking specific GLT-1 labeling was subtracted prior to normalization of values to WT
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0were from the following sources SMI-32 Sternberger Monoclonals Berkeley CA GLT-1 Chemicon Temecula CA 3-nitrotyrosine Upstate Biotechnology Waltham MA
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))SOD11.4NAS slows MN loss in G93A SOD1 transgenic rats
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))SOD11.4As previously reported hemizygous G93A SOD1 transgenic rats generally develop symptoms between 115 and 130_amp_#xa0 days
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))SOD11.4Effects of NAS on glial pathology in G93A SOD1 transgenic rats
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))SOD11.4astrogliosis nitrotyrosine labeling and loss of astrocytic glutamate transport in SOD1 mutant rodent models of ALS ( Alexander et al. 2000
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0Tu et al. 1996 and a specific decrease of the GLT-1 glutamate transporter has been reported in ventral horn of the
4235GFAPglial fibrillary acidic proteinGFAP2.5we see a dramatic increase in astrogliosis as indicated by GFAP labeling most prominent initially in ventral horn and extending throughout
4235GFAPglial fibrillary acidic proteinGFAP-positive2.5increase in both numbers and intensity of labeling of large GFAP-positive astrocytes in Tg-S mild attenuation of this astrocytosis in the
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0Finally there was a marked and consistent decrease in GLT-1 staining most prominent in ventral horn
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0Notably in wild-type animals GLT-1 labeling often showed a rim of particularly strong labeling immediately
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0Quantification of GLT-1 labeling in the neuropil surrounding MNs revealed a sharp decrease
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0in the neuropil surrounding MNs revealed a sharp decrease in GLT-1 labeling surrounding MNs in sham-treated transgenic animals (Tg-S) Tg-S
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0NAS on NT labeling NAS completely prevented the loss of GLT-1 labeling ( Fig 4
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0Howland et al. 2002 we observe substantial loss of the GLT-1 glutamate transporter most evident in the ventral horn in close
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0preservation not only of ventral horn MNs but also of GLT-1 labeling near ventral horn MNs
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0protection by NAS of MNs themselves as well as of GLT-1 levels in the adjacent astrocytes is most consistent with the
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0Indeed observations that substantial loss of GLT-1 preceded much of the MN loss ( Howland et al.
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))SOD11.4as MNs is well documented in both sporadic human and SOD1 linked forms of the disease ( Beal et al. 1997
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))SOD11.4Of note while SOD1 mutations only account for a small percentage of human ALS
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))SOD11.4between MNs and glia which we suggest are unique to SOD1 linked forms of disease transporter loss and oxidative tissue damage
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))SOD11.4It has become increasingly clear that MN degeneration in SOD1 linked models of ALS is non-cell-autonomous with the genotype of
4235GFAPglial fibrillary acidic proteinGFAP2.5transgenic rats and stained for glial fibrillary acidic protein (GFAP, GFAP green and SMI-32 (red, red A 3-nitrotyrosine (B), B or
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0red A 3-nitrotyrosine (B), B or the astrocytic glutamate transporter GLT-1 (green) green along with SMI-32 (red, red C
4235GFAPglial fibrillary acidic proteinGFAP2.5number of reactive astrocytes near transgenic MNs indicated by strong GFAP labeling
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0Finally note the rim of strong GLT-1 labeling surrounding MNs in wild-type animals and the distinct loss
4235GFAPglial fibrillary acidic proteinGFAP2.530-day intrathecal infusions stained for glial fibrillary acidic protein (GFAP; GFAP 400_amp_#xd7 or for 3-nitrotyrosine (NT; NT 400_amp_#xd7 inserts 40_amp_#xd7
4235GFAPglial fibrillary acidic proteinGFAP-positive2.5Note the marked increase in numbers of GFAP-positive reactive astrocytes in transgenic animals (Tg-S), Tg-S the modest attenuation
4235GFAPglial fibrillary acidic proteinGFAP2.5(B) B Quantification of labeling graphs show quantification of GFAP and NT labeling
4235GFAPglial fibrillary acidic proteinGFAP2.5GFAP labeling was quantified as the number of distinct GFAP-positive astrocytes
4235GFAPglial fibrillary acidic proteinGFAP-positive2.5GFAP labeling was quantified as the number of distinct GFAP-positive astrocytes per high power (400_amp_#xd7;) 400_amp_#xd7 field whereas NT staining
4235GFAPglial fibrillary acidic proteinGFAP2.5labeling intensity in 25-_amp_#x3bc m zones surrounding each MN (GFAP GFAP counts based upon 6 independent experiments _amp_#x3e 20 fields for
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0Fig 4._amp_#xa0 Loss of GLT-1 in ventral horn astrocytes of G93A rats and preservation by
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0(A) A GLT-1 immunofluorescence photomicrographs show the ventral horn region of lumbar spinal
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0(upon upon termination of the 30-day intrathecal infusions stained for GLT-1 (40, 40 400_amp_#xd7 and for SMI-32 (right, right 400_amp_#xd7
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0Note the strong GLT-1 labeling surrounding MNs and throughout ventral horn MN clusters in
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0show clusters of ventral horn motor neurons with strong astrocytic GLT-1 labeling arrowhead shows persistent strong GLT-1 labeling in dorsal horn
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0neurons with strong astrocytic GLT-1 labeling arrowhead shows persistent strong GLT-1 labeling in dorsal horn of untreated transgenic animals
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2GLT-11.0(B) B Quantification of labeling graph shown quantification of GLT-1 labeling in 5-_amp_#x3bc m zones surrounding each MN (compiled compiled
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0in wild type animals immunoreactivity for the astrocytic glutamate transporter glt 1 was particularly strong around ventral horn mns.
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0however a marked loss of ventral horn glt 1 was observed along with substantial mn damage prior to onset of symptoms 90_amp_#x2013;100_amp_#xa0;days in the g93a rats.
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0compared to sham treated g93a animals 30 day nas infusions starting at 67 _amp_#xb1; 2_amp_#xa0;days of age markedly diminished the loss of both mns and of astrocytic glt 1 labeling.
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0although the cause of most cases is unknown observations of deficiencies in glutamate uptake resulting from a selective loss of the astrocytic glutamate transporter glt 1 suggested an excitotoxic contribution [rothstein et al. 1992] and [rothstein et al. 1995] .
4571GRIA1glutamate receptor, ionotropic, AMPA 1glutamate receptor1.0likely contributing to this vulnerability mns possess substantial numbers of unusual ca 2+ permeable ampa type glutamate receptor channels ca ampa channels [carriedo et al. 1995] [carriedo et al. 1996] [van den bosch et al. 2000] and [vandenberghe et al. 2000] .
11179SOD1superoxide dismutase 1, soluble (amyotrophic lateral sclerosis 1 (adult))superoxide dismutase1.0currently the best animal models of als are provided by rodents harboring mutant forms of the enzyme cu zn superoxide dismutase sod1 which are associated with familial als in humans.
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0we find that this treatment slows not only mn loss in these animals but also slows the loss of glt 1 glutamate transporter in ventral horn regions near mns consistent with the idea that ca ampa channel activation on mns contributes to the loss of astrocytic glutamate transport.
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0 stains were carried out on floating sections blocked 10% fbs 1_amp_#xa0;h and exposed to primary antibody in 10% fbs 0.3% triton x 100 smi 32 1:8000 ip 1:2000 if sternberger monoclonals berkeley ca; glt 1 1:1000 chemicon temecula ca; 3 nitrotyrosine 10_amp_#xa0;_amp_#x3bc;g/ml upstate biotechnology waltham ma .
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0for examination of nt and glt 1 labeling staining in the neuropil surrounding ventral horn mns care was taken to ensure that all slices from each experiment were labeled using identical primary and secondary antibody exposures and
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0for glt 1 fluorescence was measured in 5 _amp_#x3bc;m zones surrounding the mns.
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0for this measure non specific background fluorescence from the center of a neuron a region lacking specific glt 1 labeling was subtracted prior to normalization of values to wt as above.
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0antibodies were from the following sources: smi 32 sternberger monoclonals berkeley ca; glt 1 chemicon temecula ca; 3 nitrotyrosine upstate biotechnology waltham ma.
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0itrotyrosine labeling and loss of astrocytic glutamate transport in sod1 mutant rodent models of als [alexander et al. 2000] [ferrante et al. 1997] and [tu et al. 1996] and a specific decrease of the glt 1 glutamate transporter has been reported in ventral horn of the g93a rats that are the subject of this study howland et al. 2002 .
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0finally there was a marked and consistent decrease in glt 1 staining most prominent in ventral horn.
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0notably in wild type animals glt 1 labeling often showed a rim of particularly strong labeling immediately surrounding mn somata whereas even in the presymptomatic animals this rim was often conspicuously absent fig 2 c .
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0quantification of glt 1 labeling in the neuropil surrounding mns revealed a sharp decrease in glt 1 labeling surrounding mns in sham treated transgenic animals tg s .
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0however in contrast to the paucity of effect of nas on nt labeling nas completely prevented the loss of glt 1 labeling fig 4 .
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0in agreement with prior studies of these animals howland et al. 2002 we observe substantial loss of the glt 1 glutamate transporter most evident in the ventral horn in close proximity to mns in late presymptomatic animals 97_amp_#xa0;days shortly before an acceleration in the rate of mn death with developmen
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0the primary new findings of present studies are that animals treated with the ca ampa channel blocker nas demonstrate a marked preservation not only of ventral horn mns but also of glt 1 labeling near ventral horn mns.
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0s generators in response to ca ampa channel activation taken together with present observations of strong oxidative damage in the vicinity of mns and protection by nas of mns themselves as well as of glt 1 levels in the adjacent astrocytes is most consistent with the primary relevant effect of nas being mn ca ampa channel blockade.
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0indeed observations that substantial loss of glt 1 preceded much of the mn loss howland et al. 2002 and that increasing the level of this transporter slows disease onset guo et al. 2003 whereas decreasing its levels accelerates disease in g93a transg
4235GFAPglial fibrillary acidic proteinglial fibrillary acidic protein1.0lumbar spinal cord sections were obtained from 97 _amp_#xb1; 2 day old wild type and g93a transgenic rats and stained for glial fibrillary acidic protein gfap green and smi 32 red a 3 nitrotyrosine b or the astrocytic glutamate transporter glt 1 green along with smi 32 red c .
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0d from 97 _amp_#xb1; 2 day old wild type and g93a transgenic rats and stained for glial fibrillary acidic protein gfap green and smi 32 red a 3 nitrotyrosine b or the astrocytic glutamate transporter glt 1 green along with smi 32 red c .
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0finally note the rim of strong glt 1 labeling surrounding mns in wild type animals and the distinct loss of labeling surrounding mns in the transgenics.
4235GFAPglial fibrillary acidic proteinglial fibrillary acidic protein1.0 a photomicrographs show the ventral horn region of lumbar spinal cord sections derived from 97 _amp_#xb1; 2 day old rats upon termination of the 30 day intrathecal infusions stained for glial fibrillary acidic protein gfap; 400_amp_#xd7; or for 3 nitrotyrosine nt; 400_amp_#xd7; inserts 40_amp_#xd7; .
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0fig. 4._amp_#xa0;loss of glt 1 in ventral horn astrocytes of g93a rats and preservation by nas.
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0 a glt 1 immunofluorescence: photomicrographs show the ventral horn region of lumbar spinal cord sections derived from 97 _amp_#xb1; 2 day old rats upon termination of the 30 day intrathecal infusions stained
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0nofluorescence: photomicrographs show the ventral horn region of lumbar spinal cord sections derived from 97 _amp_#xb1; 2 day old rats upon termination of the 30 day intrathecal infusions stained for glt 1 40 400_amp_#xd7; and for smi 32 right 400_amp_#xd7; .
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0note the strong glt 1 labeling surrounding mns and throughout ventral horn mn clusters in wild type wt animals in contrast to the preferential loss of ventral horn labeling with preservation of dorsal horn labeling in tra
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0arrows show clusters of ventral horn motor neurons with strong astrocytic glt 1 labeling; arrowhead shows persistent strong glt 1 labeling in dorsal horn of untreated transgenic animals.
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2glt 11.0 b quantification of labeling: graph shown quantification of glt 1 labeling in 5 _amp_#x3bc;m zones surrounding each mn compiled from 4 independent experiments _amp_#x3e; 100 surround regions for wt tg s and tg nas conditions; 3 animals _amp_#x3e; 60 regions for tg
10940SLC1A2solute carrier family 1 (glial high affinity glutamate transporter), member 2excitatory amino acid transporter 21.0excitatory amino acid antagonists|excitatory amino acid transporter 2|glial fibrillary acidic protein|1 naphthylacetylspermine|spermine|sod1 g93a protein|superoxide dismutase|