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The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord
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| Zeitschriftentitel: | The Journal of Neuroscience |
|---|---|
| Personen und Körperschaften: | , , |
| In: | The Journal of Neuroscience, 14, 1994, 5, S. 3364-3369 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
Society for Neuroscience
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| Schlagwörter: |
| author_facet |
Hornfeldt, CS Sun, X Larson, AA Hornfeldt, CS Sun, X Larson, AA |
|---|---|
| author |
Hornfeldt, CS Sun, X Larson, AA |
| spellingShingle |
Hornfeldt, CS Sun, X Larson, AA The Journal of Neuroscience The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord General Neuroscience |
| author_sort |
hornfeldt, cs |
| spelling |
Hornfeldt, CS Sun, X Larson, AA 0270-6474 1529-2401 Society for Neuroscience General Neuroscience http://dx.doi.org/10.1523/jneurosci.14-05-03364.1994 <jats:p>Excitatory amino acids (EAAs) and substance P are believed to transmit nociceptive information in the spinal cord. As substance P NH2-terminal fragments can modulate non-NMDA EAA-mediated activity, we examined the effects of substance P fragments to ascertain whether the COOH- or NH2- terminus of substance P modulates the actions of NMDA in the spinal cord. NMDA activity was measured by the intensity of behaviors produced by NMDA (0.2 nmol) administered intrathecally in the mouse. The NMDA response was attenuated after pretreatment with either substance P (22.5 pmol, 30 min) or the NH2-terminal fragment of substance P, SP-(1– 7). Pretreatment with the COOH-terminal fragment SP-(5–11) (22.5 pmol, 30 min), a neurokinin ligand, had no effect on NMDA-induced behaviors, suggesting that the inhibitory effect of substance P is caused by the NH2-terminus. Pretreatment with D-Pro2,D-Phe7 substance P-(1–7), a SP- (1–7) antagonist, potentiated NMDA activity, suggesting a tonic inhibitory effect of the substance P NH2-terminus. Desensitization to NMDA typically develops when NMDA is injected at 2 min intervals. While pretreatment with SP-(1–7) inhibited NMDA, coadministration of SP-(1–7) (22.5 pmol), with the first of four injections of NMDA, first inhibited but then potentiated responses to each challenge with NMDA. Coadministration of the same dose of SP-(1–7) with the fourth injection of NMDA immediately potentiated the response to NMDA.(ABSTRACT TRUNCATED AT 250 WORDS)</jats:p> The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord The Journal of Neuroscience |
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1994 |
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| title |
The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord |
| title_unstemmed |
The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord |
| title_full |
The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord |
| title_fullStr |
The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord |
| title_full_unstemmed |
The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord |
| title_short |
The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord |
| title_sort |
the nh2-terminus of substance p modulates nmda-induced activity in the mouse spinal cord |
| topic |
General Neuroscience |
| url |
http://dx.doi.org/10.1523/jneurosci.14-05-03364.1994 |
| publishDate |
1994 |
| physical |
3364-3369 |
| description |
<jats:p>Excitatory amino acids (EAAs) and substance P are believed to transmit nociceptive information in the spinal cord. As substance P NH2-terminal fragments can modulate non-NMDA EAA-mediated activity, we examined the effects of substance P fragments to ascertain whether the COOH- or NH2- terminus of substance P modulates the actions of NMDA in the spinal cord. NMDA activity was measured by the intensity of behaviors produced by NMDA (0.2 nmol) administered intrathecally in the mouse. The NMDA response was attenuated after pretreatment with either substance P (22.5 pmol, 30 min) or the NH2-terminal fragment of substance P, SP-(1– 7). Pretreatment with the COOH-terminal fragment SP-(5–11) (22.5 pmol, 30 min), a neurokinin ligand, had no effect on NMDA-induced behaviors, suggesting that the inhibitory effect of substance P is caused by the NH2-terminus. Pretreatment with D-Pro2,D-Phe7 substance P-(1–7), a SP- (1–7) antagonist, potentiated NMDA activity, suggesting a tonic inhibitory effect of the substance P NH2-terminus. Desensitization to NMDA typically develops when NMDA is injected at 2 min intervals. While pretreatment with SP-(1–7) inhibited NMDA, coadministration of SP-(1–7) (22.5 pmol), with the first of four injections of NMDA, first inhibited but then potentiated responses to each challenge with NMDA. Coadministration of the same dose of SP-(1–7) with the fourth injection of NMDA immediately potentiated the response to NMDA.(ABSTRACT TRUNCATED AT 250 WORDS)</jats:p> |
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| author | Hornfeldt, CS, Sun, X, Larson, AA |
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| author_sort | hornfeldt, cs |
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| description | <jats:p>Excitatory amino acids (EAAs) and substance P are believed to transmit nociceptive information in the spinal cord. As substance P NH2-terminal fragments can modulate non-NMDA EAA-mediated activity, we examined the effects of substance P fragments to ascertain whether the COOH- or NH2- terminus of substance P modulates the actions of NMDA in the spinal cord. NMDA activity was measured by the intensity of behaviors produced by NMDA (0.2 nmol) administered intrathecally in the mouse. The NMDA response was attenuated after pretreatment with either substance P (22.5 pmol, 30 min) or the NH2-terminal fragment of substance P, SP-(1– 7). Pretreatment with the COOH-terminal fragment SP-(5–11) (22.5 pmol, 30 min), a neurokinin ligand, had no effect on NMDA-induced behaviors, suggesting that the inhibitory effect of substance P is caused by the NH2-terminus. Pretreatment with D-Pro2,D-Phe7 substance P-(1–7), a SP- (1–7) antagonist, potentiated NMDA activity, suggesting a tonic inhibitory effect of the substance P NH2-terminus. Desensitization to NMDA typically develops when NMDA is injected at 2 min intervals. While pretreatment with SP-(1–7) inhibited NMDA, coadministration of SP-(1–7) (22.5 pmol), with the first of four injections of NMDA, first inhibited but then potentiated responses to each challenge with NMDA. Coadministration of the same dose of SP-(1–7) with the fourth injection of NMDA immediately potentiated the response to NMDA.(ABSTRACT TRUNCATED AT 250 WORDS)</jats:p> |
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| imprint_str_mv | Society for Neuroscience, 1994 |
| institution | DE-105, DE-14, DE-Ch1, DE-L229, DE-D275, DE-Bn3, DE-Brt1, DE-D161, DE-Zwi2, DE-Gla1, DE-Zi4, DE-15, DE-Pl11, DE-Rs1 |
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| spelling | Hornfeldt, CS Sun, X Larson, AA 0270-6474 1529-2401 Society for Neuroscience General Neuroscience http://dx.doi.org/10.1523/jneurosci.14-05-03364.1994 <jats:p>Excitatory amino acids (EAAs) and substance P are believed to transmit nociceptive information in the spinal cord. As substance P NH2-terminal fragments can modulate non-NMDA EAA-mediated activity, we examined the effects of substance P fragments to ascertain whether the COOH- or NH2- terminus of substance P modulates the actions of NMDA in the spinal cord. NMDA activity was measured by the intensity of behaviors produced by NMDA (0.2 nmol) administered intrathecally in the mouse. The NMDA response was attenuated after pretreatment with either substance P (22.5 pmol, 30 min) or the NH2-terminal fragment of substance P, SP-(1– 7). Pretreatment with the COOH-terminal fragment SP-(5–11) (22.5 pmol, 30 min), a neurokinin ligand, had no effect on NMDA-induced behaviors, suggesting that the inhibitory effect of substance P is caused by the NH2-terminus. Pretreatment with D-Pro2,D-Phe7 substance P-(1–7), a SP- (1–7) antagonist, potentiated NMDA activity, suggesting a tonic inhibitory effect of the substance P NH2-terminus. Desensitization to NMDA typically develops when NMDA is injected at 2 min intervals. While pretreatment with SP-(1–7) inhibited NMDA, coadministration of SP-(1–7) (22.5 pmol), with the first of four injections of NMDA, first inhibited but then potentiated responses to each challenge with NMDA. Coadministration of the same dose of SP-(1–7) with the fourth injection of NMDA immediately potentiated the response to NMDA.(ABSTRACT TRUNCATED AT 250 WORDS)</jats:p> The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord The Journal of Neuroscience |
| spellingShingle | Hornfeldt, CS, Sun, X, Larson, AA, The Journal of Neuroscience, The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord, General Neuroscience |
| title | The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord |
| title_full | The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord |
| title_fullStr | The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord |
| title_full_unstemmed | The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord |
| title_short | The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord |
| title_sort | the nh2-terminus of substance p modulates nmda-induced activity in the mouse spinal cord |
| title_unstemmed | The NH2-terminus of substance P modulates NMDA-induced activity in the mouse spinal cord |
| topic | General Neuroscience |
| url | http://dx.doi.org/10.1523/jneurosci.14-05-03364.1994 |