Differential increases in chromogranins, but not synapsin I, in cortical neurons following spreading depression: implications for functional roles and transmitter peptide release
Experimental damage of cerebral cortex induces a slow-moving depolarization and subsequent depression of activity called cortical spreading depression (CSD) which is associated with various ionic, metabolic and genomic changes. Chromogranins are a family of water-soluble acidic proteins with a wides...
Ausführliche Beschreibung
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| Autor*in: |
Shen, Pei-Juan [verfasserIn] Gundlach, Andrew L. [verfasserIn] |
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E-Artikel |
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| Erschienen: |
Oxford, UK: Blackwell Science Ltd ; 1998 |
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Online-Ressource |
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| Reproduktion: |
2001 ; Blackwell Publishing Journal Backfiles 1879-2005 |
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| Übergeordnetes Werk: |
In: European journal of neuroscience - Oxford [u.a.] : Blackwell, 1989, 10(1998), 7, Seite 0 |
| Übergeordnetes Werk: |
volume:10 ; year:1998 ; number:7 ; pages:0 |
| Links: |
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| DOI / URN: |
10.1046/j.1460-9568.1998.00231.x |
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| 520 | |a Experimental damage of cerebral cortex induces a slow-moving depolarization and subsequent depression of activity called cortical spreading depression (CSD) which is associated with various ionic, metabolic and genomic changes. Chromogranins are a family of water-soluble acidic proteins with a widespread distribution in secretory, large dense-core vesicles of neurons. We have earlier reported that secretogranin II (SgII) mRNA is increased in cerebral cortex hours after a unilateral craniotomy which would have induced CSD. To investigate further the regulation of chromogranin systems and the nature of genomic and biochemical changes produced by CSD, this study examined the temporal changes in chromogranin A (CgA), chromogranin B (CgB) and SgII mRNAs and CgB and SgII immunoreactivity (IR) in cerebral cortex and hippocampus following unilateralKCl-induced CSD. For comparison, the levels of mRNA for synapsin I, a protein present in small synaptic vesicles was also examined. Rats were killed at various times after 10 min or 2 h of CSD and levels of chromogranins mRNAs were determined by semiquantitative in situ hybridization histochemistry, while changes in corresponding peptide products were detected by immunohistochemistry. CSD increased both SgII and CgB mRNA levels in ipsilateral cortex – levels of SgII mRNA were significantly (P < 0.01) increased at 1–6 h after CSD (165–225% of levels in contralateral cortex), but were not significantly above control values at later time points. Increased expression of CgB mRNA was delayed and prolonged compared with SgII and was significantly (P < 0.05) increased between 3 and 24 h (120–145%) after CSD, peaked at 2 days (180%), and was still elevated at 1 week (130%) compared with contralateral cortex. No alteration in CgA mRNA was observed in the ipsilateral cortex of the same animals across the entire time-course except for an increase in piriform cortex at 1–2 days. In contrast, levels of synapsin I mRNA in affected cortex were identical to those in contralateral cortex and cortex in sham-operated rats, at all times after CSD. Levels of chromogranin (SN-IR and PE-11-IR) were also increased in ipsilateral cortex following CSD. A strong increase in SN-IR in neuronal cell bodies and fibres was observed at 12 h and a moderate increase in PE-11-IR was observed 24–72 h after CSD. These results demonstrate that chromogranin transcripts and gene products are differentially regulated by neuronal depolarization/depression occurring during CSD and suggest that these chromogranin proteins may have differing functional roles in peptide transmitter release and distinct effects on neuronal function in rat brain. | ||
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10.1046/j.1460-9568.1998.00231.x doi (DE-627)NLEJ242448496 DE-627 ger DE-627 rakwb Shen, Pei-Juan verfasserin aut Differential increases in chromogranins, but not synapsin I, in cortical neurons following spreading depression: implications for functional roles and transmitter peptide release Oxford, UK Blackwell Science Ltd 1998 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Experimental damage of cerebral cortex induces a slow-moving depolarization and subsequent depression of activity called cortical spreading depression (CSD) which is associated with various ionic, metabolic and genomic changes. Chromogranins are a family of water-soluble acidic proteins with a widespread distribution in secretory, large dense-core vesicles of neurons. We have earlier reported that secretogranin II (SgII) mRNA is increased in cerebral cortex hours after a unilateral craniotomy which would have induced CSD. To investigate further the regulation of chromogranin systems and the nature of genomic and biochemical changes produced by CSD, this study examined the temporal changes in chromogranin A (CgA), chromogranin B (CgB) and SgII mRNAs and CgB and SgII immunoreactivity (IR) in cerebral cortex and hippocampus following unilateralKCl-induced CSD. For comparison, the levels of mRNA for synapsin I, a protein present in small synaptic vesicles was also examined. Rats were killed at various times after 10 min or 2 h of CSD and levels of chromogranins mRNAs were determined by semiquantitative in situ hybridization histochemistry, while changes in corresponding peptide products were detected by immunohistochemistry. CSD increased both SgII and CgB mRNA levels in ipsilateral cortex – levels of SgII mRNA were significantly (P < 0.01) increased at 1–6 h after CSD (165–225% of levels in contralateral cortex), but were not significantly above control values at later time points. Increased expression of CgB mRNA was delayed and prolonged compared with SgII and was significantly (P < 0.05) increased between 3 and 24 h (120–145%) after CSD, peaked at 2 days (180%), and was still elevated at 1 week (130%) compared with contralateral cortex. No alteration in CgA mRNA was observed in the ipsilateral cortex of the same animals across the entire time-course except for an increase in piriform cortex at 1–2 days. In contrast, levels of synapsin I mRNA in affected cortex were identical to those in contralateral cortex and cortex in sham-operated rats, at all times after CSD. Levels of chromogranin (SN-IR and PE-11-IR) were also increased in ipsilateral cortex following CSD. A strong increase in SN-IR in neuronal cell bodies and fibres was observed at 12 h and a moderate increase in PE-11-IR was observed 24–72 h after CSD. These results demonstrate that chromogranin transcripts and gene products are differentially regulated by neuronal depolarization/depression occurring during CSD and suggest that these chromogranin proteins may have differing functional roles in peptide transmitter release and distinct effects on neuronal function in rat brain. 2001 Blackwell Publishing Journal Backfiles 1879-2005 |2001|||||||||| chromogranin A and B, immunohistochemistry, in situ hybridization histochemistry, rat, secretogranin II Gundlach, Andrew L. verfasserin aut In European journal of neuroscience Oxford [u.a.] : Blackwell, 1989 10(1998), 7, Seite 0 Online-Ressource (DE-627)NLEJ243926383 (DE-600)2005178-5 1460-9568 nnns volume:10 year:1998 number:7 pages:0 http://dx.doi.org/10.1046/j.1460-9568.1998.00231.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 10 1998 7 0 |
| spelling |
10.1046/j.1460-9568.1998.00231.x doi (DE-627)NLEJ242448496 DE-627 ger DE-627 rakwb Shen, Pei-Juan verfasserin aut Differential increases in chromogranins, but not synapsin I, in cortical neurons following spreading depression: implications for functional roles and transmitter peptide release Oxford, UK Blackwell Science Ltd 1998 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Experimental damage of cerebral cortex induces a slow-moving depolarization and subsequent depression of activity called cortical spreading depression (CSD) which is associated with various ionic, metabolic and genomic changes. Chromogranins are a family of water-soluble acidic proteins with a widespread distribution in secretory, large dense-core vesicles of neurons. We have earlier reported that secretogranin II (SgII) mRNA is increased in cerebral cortex hours after a unilateral craniotomy which would have induced CSD. To investigate further the regulation of chromogranin systems and the nature of genomic and biochemical changes produced by CSD, this study examined the temporal changes in chromogranin A (CgA), chromogranin B (CgB) and SgII mRNAs and CgB and SgII immunoreactivity (IR) in cerebral cortex and hippocampus following unilateralKCl-induced CSD. For comparison, the levels of mRNA for synapsin I, a protein present in small synaptic vesicles was also examined. Rats were killed at various times after 10 min or 2 h of CSD and levels of chromogranins mRNAs were determined by semiquantitative in situ hybridization histochemistry, while changes in corresponding peptide products were detected by immunohistochemistry. CSD increased both SgII and CgB mRNA levels in ipsilateral cortex – levels of SgII mRNA were significantly (P < 0.01) increased at 1–6 h after CSD (165–225% of levels in contralateral cortex), but were not significantly above control values at later time points. Increased expression of CgB mRNA was delayed and prolonged compared with SgII and was significantly (P < 0.05) increased between 3 and 24 h (120–145%) after CSD, peaked at 2 days (180%), and was still elevated at 1 week (130%) compared with contralateral cortex. No alteration in CgA mRNA was observed in the ipsilateral cortex of the same animals across the entire time-course except for an increase in piriform cortex at 1–2 days. In contrast, levels of synapsin I mRNA in affected cortex were identical to those in contralateral cortex and cortex in sham-operated rats, at all times after CSD. Levels of chromogranin (SN-IR and PE-11-IR) were also increased in ipsilateral cortex following CSD. A strong increase in SN-IR in neuronal cell bodies and fibres was observed at 12 h and a moderate increase in PE-11-IR was observed 24–72 h after CSD. These results demonstrate that chromogranin transcripts and gene products are differentially regulated by neuronal depolarization/depression occurring during CSD and suggest that these chromogranin proteins may have differing functional roles in peptide transmitter release and distinct effects on neuronal function in rat brain. 2001 Blackwell Publishing Journal Backfiles 1879-2005 |2001|||||||||| chromogranin A and B, immunohistochemistry, in situ hybridization histochemistry, rat, secretogranin II Gundlach, Andrew L. verfasserin aut In European journal of neuroscience Oxford [u.a.] : Blackwell, 1989 10(1998), 7, Seite 0 Online-Ressource (DE-627)NLEJ243926383 (DE-600)2005178-5 1460-9568 nnns volume:10 year:1998 number:7 pages:0 http://dx.doi.org/10.1046/j.1460-9568.1998.00231.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 10 1998 7 0 |
| allfields_unstemmed |
10.1046/j.1460-9568.1998.00231.x doi (DE-627)NLEJ242448496 DE-627 ger DE-627 rakwb Shen, Pei-Juan verfasserin aut Differential increases in chromogranins, but not synapsin I, in cortical neurons following spreading depression: implications for functional roles and transmitter peptide release Oxford, UK Blackwell Science Ltd 1998 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Experimental damage of cerebral cortex induces a slow-moving depolarization and subsequent depression of activity called cortical spreading depression (CSD) which is associated with various ionic, metabolic and genomic changes. Chromogranins are a family of water-soluble acidic proteins with a widespread distribution in secretory, large dense-core vesicles of neurons. We have earlier reported that secretogranin II (SgII) mRNA is increased in cerebral cortex hours after a unilateral craniotomy which would have induced CSD. To investigate further the regulation of chromogranin systems and the nature of genomic and biochemical changes produced by CSD, this study examined the temporal changes in chromogranin A (CgA), chromogranin B (CgB) and SgII mRNAs and CgB and SgII immunoreactivity (IR) in cerebral cortex and hippocampus following unilateralKCl-induced CSD. For comparison, the levels of mRNA for synapsin I, a protein present in small synaptic vesicles was also examined. Rats were killed at various times after 10 min or 2 h of CSD and levels of chromogranins mRNAs were determined by semiquantitative in situ hybridization histochemistry, while changes in corresponding peptide products were detected by immunohistochemistry. CSD increased both SgII and CgB mRNA levels in ipsilateral cortex – levels of SgII mRNA were significantly (P < 0.01) increased at 1–6 h after CSD (165–225% of levels in contralateral cortex), but were not significantly above control values at later time points. Increased expression of CgB mRNA was delayed and prolonged compared with SgII and was significantly (P < 0.05) increased between 3 and 24 h (120–145%) after CSD, peaked at 2 days (180%), and was still elevated at 1 week (130%) compared with contralateral cortex. No alteration in CgA mRNA was observed in the ipsilateral cortex of the same animals across the entire time-course except for an increase in piriform cortex at 1–2 days. In contrast, levels of synapsin I mRNA in affected cortex were identical to those in contralateral cortex and cortex in sham-operated rats, at all times after CSD. Levels of chromogranin (SN-IR and PE-11-IR) were also increased in ipsilateral cortex following CSD. A strong increase in SN-IR in neuronal cell bodies and fibres was observed at 12 h and a moderate increase in PE-11-IR was observed 24–72 h after CSD. These results demonstrate that chromogranin transcripts and gene products are differentially regulated by neuronal depolarization/depression occurring during CSD and suggest that these chromogranin proteins may have differing functional roles in peptide transmitter release and distinct effects on neuronal function in rat brain. 2001 Blackwell Publishing Journal Backfiles 1879-2005 |2001|||||||||| chromogranin A and B, immunohistochemistry, in situ hybridization histochemistry, rat, secretogranin II Gundlach, Andrew L. verfasserin aut In European journal of neuroscience Oxford [u.a.] : Blackwell, 1989 10(1998), 7, Seite 0 Online-Ressource (DE-627)NLEJ243926383 (DE-600)2005178-5 1460-9568 nnns volume:10 year:1998 number:7 pages:0 http://dx.doi.org/10.1046/j.1460-9568.1998.00231.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 10 1998 7 0 |
| allfieldsGer |
10.1046/j.1460-9568.1998.00231.x doi (DE-627)NLEJ242448496 DE-627 ger DE-627 rakwb Shen, Pei-Juan verfasserin aut Differential increases in chromogranins, but not synapsin I, in cortical neurons following spreading depression: implications for functional roles and transmitter peptide release Oxford, UK Blackwell Science Ltd 1998 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Experimental damage of cerebral cortex induces a slow-moving depolarization and subsequent depression of activity called cortical spreading depression (CSD) which is associated with various ionic, metabolic and genomic changes. Chromogranins are a family of water-soluble acidic proteins with a widespread distribution in secretory, large dense-core vesicles of neurons. We have earlier reported that secretogranin II (SgII) mRNA is increased in cerebral cortex hours after a unilateral craniotomy which would have induced CSD. To investigate further the regulation of chromogranin systems and the nature of genomic and biochemical changes produced by CSD, this study examined the temporal changes in chromogranin A (CgA), chromogranin B (CgB) and SgII mRNAs and CgB and SgII immunoreactivity (IR) in cerebral cortex and hippocampus following unilateralKCl-induced CSD. For comparison, the levels of mRNA for synapsin I, a protein present in small synaptic vesicles was also examined. Rats were killed at various times after 10 min or 2 h of CSD and levels of chromogranins mRNAs were determined by semiquantitative in situ hybridization histochemistry, while changes in corresponding peptide products were detected by immunohistochemistry. CSD increased both SgII and CgB mRNA levels in ipsilateral cortex – levels of SgII mRNA were significantly (P < 0.01) increased at 1–6 h after CSD (165–225% of levels in contralateral cortex), but were not significantly above control values at later time points. Increased expression of CgB mRNA was delayed and prolonged compared with SgII and was significantly (P < 0.05) increased between 3 and 24 h (120–145%) after CSD, peaked at 2 days (180%), and was still elevated at 1 week (130%) compared with contralateral cortex. No alteration in CgA mRNA was observed in the ipsilateral cortex of the same animals across the entire time-course except for an increase in piriform cortex at 1–2 days. In contrast, levels of synapsin I mRNA in affected cortex were identical to those in contralateral cortex and cortex in sham-operated rats, at all times after CSD. Levels of chromogranin (SN-IR and PE-11-IR) were also increased in ipsilateral cortex following CSD. A strong increase in SN-IR in neuronal cell bodies and fibres was observed at 12 h and a moderate increase in PE-11-IR was observed 24–72 h after CSD. These results demonstrate that chromogranin transcripts and gene products are differentially regulated by neuronal depolarization/depression occurring during CSD and suggest that these chromogranin proteins may have differing functional roles in peptide transmitter release and distinct effects on neuronal function in rat brain. 2001 Blackwell Publishing Journal Backfiles 1879-2005 |2001|||||||||| chromogranin A and B, immunohistochemistry, in situ hybridization histochemistry, rat, secretogranin II Gundlach, Andrew L. verfasserin aut In European journal of neuroscience Oxford [u.a.] : Blackwell, 1989 10(1998), 7, Seite 0 Online-Ressource (DE-627)NLEJ243926383 (DE-600)2005178-5 1460-9568 nnns volume:10 year:1998 number:7 pages:0 http://dx.doi.org/10.1046/j.1460-9568.1998.00231.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 10 1998 7 0 |
| allfieldsSound |
10.1046/j.1460-9568.1998.00231.x doi (DE-627)NLEJ242448496 DE-627 ger DE-627 rakwb Shen, Pei-Juan verfasserin aut Differential increases in chromogranins, but not synapsin I, in cortical neurons following spreading depression: implications for functional roles and transmitter peptide release Oxford, UK Blackwell Science Ltd 1998 Online-Ressource nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier Experimental damage of cerebral cortex induces a slow-moving depolarization and subsequent depression of activity called cortical spreading depression (CSD) which is associated with various ionic, metabolic and genomic changes. Chromogranins are a family of water-soluble acidic proteins with a widespread distribution in secretory, large dense-core vesicles of neurons. We have earlier reported that secretogranin II (SgII) mRNA is increased in cerebral cortex hours after a unilateral craniotomy which would have induced CSD. To investigate further the regulation of chromogranin systems and the nature of genomic and biochemical changes produced by CSD, this study examined the temporal changes in chromogranin A (CgA), chromogranin B (CgB) and SgII mRNAs and CgB and SgII immunoreactivity (IR) in cerebral cortex and hippocampus following unilateralKCl-induced CSD. For comparison, the levels of mRNA for synapsin I, a protein present in small synaptic vesicles was also examined. Rats were killed at various times after 10 min or 2 h of CSD and levels of chromogranins mRNAs were determined by semiquantitative in situ hybridization histochemistry, while changes in corresponding peptide products were detected by immunohistochemistry. CSD increased both SgII and CgB mRNA levels in ipsilateral cortex – levels of SgII mRNA were significantly (P < 0.01) increased at 1–6 h after CSD (165–225% of levels in contralateral cortex), but were not significantly above control values at later time points. Increased expression of CgB mRNA was delayed and prolonged compared with SgII and was significantly (P < 0.05) increased between 3 and 24 h (120–145%) after CSD, peaked at 2 days (180%), and was still elevated at 1 week (130%) compared with contralateral cortex. No alteration in CgA mRNA was observed in the ipsilateral cortex of the same animals across the entire time-course except for an increase in piriform cortex at 1–2 days. In contrast, levels of synapsin I mRNA in affected cortex were identical to those in contralateral cortex and cortex in sham-operated rats, at all times after CSD. Levels of chromogranin (SN-IR and PE-11-IR) were also increased in ipsilateral cortex following CSD. A strong increase in SN-IR in neuronal cell bodies and fibres was observed at 12 h and a moderate increase in PE-11-IR was observed 24–72 h after CSD. These results demonstrate that chromogranin transcripts and gene products are differentially regulated by neuronal depolarization/depression occurring during CSD and suggest that these chromogranin proteins may have differing functional roles in peptide transmitter release and distinct effects on neuronal function in rat brain. 2001 Blackwell Publishing Journal Backfiles 1879-2005 |2001|||||||||| chromogranin A and B, immunohistochemistry, in situ hybridization histochemistry, rat, secretogranin II Gundlach, Andrew L. verfasserin aut In European journal of neuroscience Oxford [u.a.] : Blackwell, 1989 10(1998), 7, Seite 0 Online-Ressource (DE-627)NLEJ243926383 (DE-600)2005178-5 1460-9568 nnns volume:10 year:1998 number:7 pages:0 http://dx.doi.org/10.1046/j.1460-9568.1998.00231.x text/html Verlag Deutschlandweit zugänglich Volltext GBV_USEFLAG_U ZDB-1-DJB GBV_NL_ARTICLE AR 10 1998 7 0 |
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Chromogranins are a family of water-soluble acidic proteins with a widespread distribution in secretory, large dense-core vesicles of neurons. We have earlier reported that secretogranin II (SgII) mRNA is increased in cerebral cortex hours after a unilateral craniotomy which would have induced CSD. To investigate further the regulation of chromogranin systems and the nature of genomic and biochemical changes produced by CSD, this study examined the temporal changes in chromogranin A (CgA), chromogranin B (CgB) and SgII mRNAs and CgB and SgII immunoreactivity (IR) in cerebral cortex and hippocampus following unilateralKCl-induced CSD. For comparison, the levels of mRNA for synapsin I, a protein present in small synaptic vesicles was also examined. Rats were killed at various times after 10 min or 2 h of CSD and levels of chromogranins mRNAs were determined by semiquantitative in situ hybridization histochemistry, while changes in corresponding peptide products were detected by immunohistochemistry. CSD increased both SgII and CgB mRNA levels in ipsilateral cortex – levels of SgII mRNA were significantly (P < 0.01) increased at 1–6 h after CSD (165–225% of levels in contralateral cortex), but were not significantly above control values at later time points. Increased expression of CgB mRNA was delayed and prolonged compared with SgII and was significantly (P < 0.05) increased between 3 and 24 h (120–145%) after CSD, peaked at 2 days (180%), and was still elevated at 1 week (130%) compared with contralateral cortex. No alteration in CgA mRNA was observed in the ipsilateral cortex of the same animals across the entire time-course except for an increase in piriform cortex at 1–2 days. In contrast, levels of synapsin I mRNA in affected cortex were identical to those in contralateral cortex and cortex in sham-operated rats, at all times after CSD. Levels of chromogranin (SN-IR and PE-11-IR) were also increased in ipsilateral cortex following CSD. A strong increase in SN-IR in neuronal cell bodies and fibres was observed at 12 h and a moderate increase in PE-11-IR was observed 24–72 h after CSD. 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Shen, Pei-Juan |
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Shen, Pei-Juan misc chromogranin A and B, immunohistochemistry, in situ hybridization histochemistry, rat, secretogranin II Differential increases in chromogranins, but not synapsin I, in cortical neurons following spreading depression: implications for functional roles and transmitter peptide release |
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Differential increases in chromogranins, but not synapsin I, in cortical neurons following spreading depression: implications for functional roles and transmitter peptide release chromogranin A and B, immunohistochemistry, in situ hybridization histochemistry, rat, secretogranin II |
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Differential increases in chromogranins, but not synapsin I, in cortical neurons following spreading depression: implications for functional roles and transmitter peptide release |
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Differential increases in chromogranins, but not synapsin I, in cortical neurons following spreading depression: implications for functional roles and transmitter peptide release |
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differential increases in chromogranins, but not synapsin i, in cortical neurons following spreading depression: implications for functional roles and transmitter peptide release |
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Differential increases in chromogranins, but not synapsin I, in cortical neurons following spreading depression: implications for functional roles and transmitter peptide release |
| abstract |
Experimental damage of cerebral cortex induces a slow-moving depolarization and subsequent depression of activity called cortical spreading depression (CSD) which is associated with various ionic, metabolic and genomic changes. Chromogranins are a family of water-soluble acidic proteins with a widespread distribution in secretory, large dense-core vesicles of neurons. We have earlier reported that secretogranin II (SgII) mRNA is increased in cerebral cortex hours after a unilateral craniotomy which would have induced CSD. To investigate further the regulation of chromogranin systems and the nature of genomic and biochemical changes produced by CSD, this study examined the temporal changes in chromogranin A (CgA), chromogranin B (CgB) and SgII mRNAs and CgB and SgII immunoreactivity (IR) in cerebral cortex and hippocampus following unilateralKCl-induced CSD. For comparison, the levels of mRNA for synapsin I, a protein present in small synaptic vesicles was also examined. Rats were killed at various times after 10 min or 2 h of CSD and levels of chromogranins mRNAs were determined by semiquantitative in situ hybridization histochemistry, while changes in corresponding peptide products were detected by immunohistochemistry. CSD increased both SgII and CgB mRNA levels in ipsilateral cortex – levels of SgII mRNA were significantly (P < 0.01) increased at 1–6 h after CSD (165–225% of levels in contralateral cortex), but were not significantly above control values at later time points. Increased expression of CgB mRNA was delayed and prolonged compared with SgII and was significantly (P < 0.05) increased between 3 and 24 h (120–145%) after CSD, peaked at 2 days (180%), and was still elevated at 1 week (130%) compared with contralateral cortex. No alteration in CgA mRNA was observed in the ipsilateral cortex of the same animals across the entire time-course except for an increase in piriform cortex at 1–2 days. In contrast, levels of synapsin I mRNA in affected cortex were identical to those in contralateral cortex and cortex in sham-operated rats, at all times after CSD. Levels of chromogranin (SN-IR and PE-11-IR) were also increased in ipsilateral cortex following CSD. A strong increase in SN-IR in neuronal cell bodies and fibres was observed at 12 h and a moderate increase in PE-11-IR was observed 24–72 h after CSD. These results demonstrate that chromogranin transcripts and gene products are differentially regulated by neuronal depolarization/depression occurring during CSD and suggest that these chromogranin proteins may have differing functional roles in peptide transmitter release and distinct effects on neuronal function in rat brain. |
| abstractGer |
Experimental damage of cerebral cortex induces a slow-moving depolarization and subsequent depression of activity called cortical spreading depression (CSD) which is associated with various ionic, metabolic and genomic changes. Chromogranins are a family of water-soluble acidic proteins with a widespread distribution in secretory, large dense-core vesicles of neurons. We have earlier reported that secretogranin II (SgII) mRNA is increased in cerebral cortex hours after a unilateral craniotomy which would have induced CSD. To investigate further the regulation of chromogranin systems and the nature of genomic and biochemical changes produced by CSD, this study examined the temporal changes in chromogranin A (CgA), chromogranin B (CgB) and SgII mRNAs and CgB and SgII immunoreactivity (IR) in cerebral cortex and hippocampus following unilateralKCl-induced CSD. For comparison, the levels of mRNA for synapsin I, a protein present in small synaptic vesicles was also examined. Rats were killed at various times after 10 min or 2 h of CSD and levels of chromogranins mRNAs were determined by semiquantitative in situ hybridization histochemistry, while changes in corresponding peptide products were detected by immunohistochemistry. CSD increased both SgII and CgB mRNA levels in ipsilateral cortex – levels of SgII mRNA were significantly (P < 0.01) increased at 1–6 h after CSD (165–225% of levels in contralateral cortex), but were not significantly above control values at later time points. Increased expression of CgB mRNA was delayed and prolonged compared with SgII and was significantly (P < 0.05) increased between 3 and 24 h (120–145%) after CSD, peaked at 2 days (180%), and was still elevated at 1 week (130%) compared with contralateral cortex. No alteration in CgA mRNA was observed in the ipsilateral cortex of the same animals across the entire time-course except for an increase in piriform cortex at 1–2 days. In contrast, levels of synapsin I mRNA in affected cortex were identical to those in contralateral cortex and cortex in sham-operated rats, at all times after CSD. Levels of chromogranin (SN-IR and PE-11-IR) were also increased in ipsilateral cortex following CSD. A strong increase in SN-IR in neuronal cell bodies and fibres was observed at 12 h and a moderate increase in PE-11-IR was observed 24–72 h after CSD. These results demonstrate that chromogranin transcripts and gene products are differentially regulated by neuronal depolarization/depression occurring during CSD and suggest that these chromogranin proteins may have differing functional roles in peptide transmitter release and distinct effects on neuronal function in rat brain. |
| abstract_unstemmed |
Experimental damage of cerebral cortex induces a slow-moving depolarization and subsequent depression of activity called cortical spreading depression (CSD) which is associated with various ionic, metabolic and genomic changes. Chromogranins are a family of water-soluble acidic proteins with a widespread distribution in secretory, large dense-core vesicles of neurons. We have earlier reported that secretogranin II (SgII) mRNA is increased in cerebral cortex hours after a unilateral craniotomy which would have induced CSD. To investigate further the regulation of chromogranin systems and the nature of genomic and biochemical changes produced by CSD, this study examined the temporal changes in chromogranin A (CgA), chromogranin B (CgB) and SgII mRNAs and CgB and SgII immunoreactivity (IR) in cerebral cortex and hippocampus following unilateralKCl-induced CSD. For comparison, the levels of mRNA for synapsin I, a protein present in small synaptic vesicles was also examined. Rats were killed at various times after 10 min or 2 h of CSD and levels of chromogranins mRNAs were determined by semiquantitative in situ hybridization histochemistry, while changes in corresponding peptide products were detected by immunohistochemistry. CSD increased both SgII and CgB mRNA levels in ipsilateral cortex – levels of SgII mRNA were significantly (P < 0.01) increased at 1–6 h after CSD (165–225% of levels in contralateral cortex), but were not significantly above control values at later time points. Increased expression of CgB mRNA was delayed and prolonged compared with SgII and was significantly (P < 0.05) increased between 3 and 24 h (120–145%) after CSD, peaked at 2 days (180%), and was still elevated at 1 week (130%) compared with contralateral cortex. No alteration in CgA mRNA was observed in the ipsilateral cortex of the same animals across the entire time-course except for an increase in piriform cortex at 1–2 days. In contrast, levels of synapsin I mRNA in affected cortex were identical to those in contralateral cortex and cortex in sham-operated rats, at all times after CSD. Levels of chromogranin (SN-IR and PE-11-IR) were also increased in ipsilateral cortex following CSD. A strong increase in SN-IR in neuronal cell bodies and fibres was observed at 12 h and a moderate increase in PE-11-IR was observed 24–72 h after CSD. These results demonstrate that chromogranin transcripts and gene products are differentially regulated by neuronal depolarization/depression occurring during CSD and suggest that these chromogranin proteins may have differing functional roles in peptide transmitter release and distinct effects on neuronal function in rat brain. |
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