Role of protein kinase C in agonist-induced desensitization of 5-HT1A receptor coupling to calcium channels in F11 cells
The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Wu, Xiaoping [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2013transfer abstract |
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| Schlagwörter: |
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| Umfang: |
8 |
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| Übergeordnetes Werk: |
Enthalten in: Mexican student-teachers’ “English” language praxicum: Decolonizing attempts - López-Gopar, Mario E. ELSEVIER, 2022, EJP, New York, NY [u.a.] |
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| Übergeordnetes Werk: |
volume:706 ; year:2013 ; number:1 ; day:15 ; month:04 ; pages:84-91 ; extent:8 |
| Links: |
|---|
| DOI / URN: |
10.1016/j.ejphar.2013.03.005 |
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ELV022239057 |
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| 245 | 1 | 0 | |a Role of protein kinase C in agonist-induced desensitization of 5-HT1A receptor coupling to calcium channels in F11 cells |
| 264 | 1 | |c 2013transfer abstract | |
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| 520 | |a The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. | ||
| 520 | |a The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. | ||
| 650 | 7 | |a 5-HT1A-receptor |2 Elsevier | |
| 650 | 7 | |a Protein kinase C |2 Elsevier | |
| 650 | 7 | |a Desensitization |2 Elsevier | |
| 650 | 7 | |a Serotonin |2 Elsevier | |
| 650 | 7 | |a Calcium current |2 Elsevier | |
| 700 | 1 | |a Kushwaha, Neena |4 oth | |
| 700 | 1 | |a Banerjee, Probal |4 oth | |
| 700 | 1 | |a Albert, Paul R. |4 oth | |
| 700 | 1 | |a Penington, Nicholas J. |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier |a López-Gopar, Mario E. ELSEVIER |t Mexican student-teachers’ “English” language praxicum: Decolonizing attempts |d 2022 |d EJP |g New York, NY [u.a.] |w (DE-627)ELV008405875 |
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10.1016/j.ejphar.2013.03.005 doi GBVA2013020000017.pica (DE-627)ELV022239057 (ELSEVIER)S0014-2999(13)00189-1 DE-627 ger DE-627 rakwb eng 610 610 DE-600 370 VZ 5,3 ssgn Wu, Xiaoping verfasserin aut Role of protein kinase C in agonist-induced desensitization of 5-HT1A receptor coupling to calcium channels in F11 cells 2013transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. 5-HT1A-receptor Elsevier Protein kinase C Elsevier Desensitization Elsevier Serotonin Elsevier Calcium current Elsevier Kushwaha, Neena oth Banerjee, Probal oth Albert, Paul R. oth Penington, Nicholas J. oth Enthalten in Elsevier López-Gopar, Mario E. ELSEVIER Mexican student-teachers’ “English” language praxicum: Decolonizing attempts 2022 EJP New York, NY [u.a.] (DE-627)ELV008405875 volume:706 year:2013 number:1 day:15 month:04 pages:84-91 extent:8 https://doi.org/10.1016/j.ejphar.2013.03.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 706 2013 1 15 0415 84-91 8 045F 610 |
| spelling |
10.1016/j.ejphar.2013.03.005 doi GBVA2013020000017.pica (DE-627)ELV022239057 (ELSEVIER)S0014-2999(13)00189-1 DE-627 ger DE-627 rakwb eng 610 610 DE-600 370 VZ 5,3 ssgn Wu, Xiaoping verfasserin aut Role of protein kinase C in agonist-induced desensitization of 5-HT1A receptor coupling to calcium channels in F11 cells 2013transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. 5-HT1A-receptor Elsevier Protein kinase C Elsevier Desensitization Elsevier Serotonin Elsevier Calcium current Elsevier Kushwaha, Neena oth Banerjee, Probal oth Albert, Paul R. oth Penington, Nicholas J. oth Enthalten in Elsevier López-Gopar, Mario E. ELSEVIER Mexican student-teachers’ “English” language praxicum: Decolonizing attempts 2022 EJP New York, NY [u.a.] (DE-627)ELV008405875 volume:706 year:2013 number:1 day:15 month:04 pages:84-91 extent:8 https://doi.org/10.1016/j.ejphar.2013.03.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 706 2013 1 15 0415 84-91 8 045F 610 |
| allfields_unstemmed |
10.1016/j.ejphar.2013.03.005 doi GBVA2013020000017.pica (DE-627)ELV022239057 (ELSEVIER)S0014-2999(13)00189-1 DE-627 ger DE-627 rakwb eng 610 610 DE-600 370 VZ 5,3 ssgn Wu, Xiaoping verfasserin aut Role of protein kinase C in agonist-induced desensitization of 5-HT1A receptor coupling to calcium channels in F11 cells 2013transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. 5-HT1A-receptor Elsevier Protein kinase C Elsevier Desensitization Elsevier Serotonin Elsevier Calcium current Elsevier Kushwaha, Neena oth Banerjee, Probal oth Albert, Paul R. oth Penington, Nicholas J. oth Enthalten in Elsevier López-Gopar, Mario E. ELSEVIER Mexican student-teachers’ “English” language praxicum: Decolonizing attempts 2022 EJP New York, NY [u.a.] (DE-627)ELV008405875 volume:706 year:2013 number:1 day:15 month:04 pages:84-91 extent:8 https://doi.org/10.1016/j.ejphar.2013.03.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 706 2013 1 15 0415 84-91 8 045F 610 |
| allfieldsGer |
10.1016/j.ejphar.2013.03.005 doi GBVA2013020000017.pica (DE-627)ELV022239057 (ELSEVIER)S0014-2999(13)00189-1 DE-627 ger DE-627 rakwb eng 610 610 DE-600 370 VZ 5,3 ssgn Wu, Xiaoping verfasserin aut Role of protein kinase C in agonist-induced desensitization of 5-HT1A receptor coupling to calcium channels in F11 cells 2013transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. 5-HT1A-receptor Elsevier Protein kinase C Elsevier Desensitization Elsevier Serotonin Elsevier Calcium current Elsevier Kushwaha, Neena oth Banerjee, Probal oth Albert, Paul R. oth Penington, Nicholas J. oth Enthalten in Elsevier López-Gopar, Mario E. ELSEVIER Mexican student-teachers’ “English” language praxicum: Decolonizing attempts 2022 EJP New York, NY [u.a.] (DE-627)ELV008405875 volume:706 year:2013 number:1 day:15 month:04 pages:84-91 extent:8 https://doi.org/10.1016/j.ejphar.2013.03.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 706 2013 1 15 0415 84-91 8 045F 610 |
| allfieldsSound |
10.1016/j.ejphar.2013.03.005 doi GBVA2013020000017.pica (DE-627)ELV022239057 (ELSEVIER)S0014-2999(13)00189-1 DE-627 ger DE-627 rakwb eng 610 610 DE-600 370 VZ 5,3 ssgn Wu, Xiaoping verfasserin aut Role of protein kinase C in agonist-induced desensitization of 5-HT1A receptor coupling to calcium channels in F11 cells 2013transfer abstract 8 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. 5-HT1A-receptor Elsevier Protein kinase C Elsevier Desensitization Elsevier Serotonin Elsevier Calcium current Elsevier Kushwaha, Neena oth Banerjee, Probal oth Albert, Paul R. oth Penington, Nicholas J. oth Enthalten in Elsevier López-Gopar, Mario E. ELSEVIER Mexican student-teachers’ “English” language praxicum: Decolonizing attempts 2022 EJP New York, NY [u.a.] (DE-627)ELV008405875 volume:706 year:2013 number:1 day:15 month:04 pages:84-91 extent:8 https://doi.org/10.1016/j.ejphar.2013.03.005 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U AR 706 2013 1 15 0415 84-91 8 045F 610 |
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English |
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Enthalten in Mexican student-teachers’ “English” language praxicum: Decolonizing attempts New York, NY [u.a.] volume:706 year:2013 number:1 day:15 month:04 pages:84-91 extent:8 |
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Enthalten in Mexican student-teachers’ “English” language praxicum: Decolonizing attempts New York, NY [u.a.] volume:706 year:2013 number:1 day:15 month:04 pages:84-91 extent:8 |
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5-HT1A-receptor Protein kinase C Desensitization Serotonin Calcium current |
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Role of protein kinase C in agonist-induced desensitization of 5-HT1A receptor coupling to calcium channels in F11 cells |
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The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. |
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The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. |
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The 5-Hydroxytriptamine 1A receptor (5-HT1A) is expressed both as a pre- and post-synaptic receptor in neurons. The presynaptic receptor preferentially desensitizes compared to post-synaptic receptors, suggesting different underlying mechanisms of agonist-induced desensitization. Using F11 cells as a model of post-synaptic neurons, the present study examined the role of protein kinase C (PKC) and protein kinase A (PKA) in desensitization of the 5-HT1A-receptor by agonist. Desensitization in whole cell experiments was dependent on internal [Ca2+] and was blocked by chelation of intracellular Ca2+. Using the perforated patch technique, desensitization was reduced when Ba2+ was used as the conducting cation. Selective inhibitors of conventional PKC isoforms prevented 5-HT-induced desensitization, whereas an inhibitor of PKA did not. In cells in which 3 PKC/PKA sites located in the third intracellular loop (i3) of the 5-HT1A receptor were mutated (i3, T229A-S253G-T343A), 5-HT-mediated desensitization was reduced (and abolished in the absence of intracellular Ca2+). In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. Furthermore, these studies reveal that 5-HT1A-receptor desensitization utilizes a different kinase in F11 cells and serotonergic neurons, which may in part account for their differential sensitivity in vivo. |
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In cells in which a fourth mutation was added (T149 in the second i2 loop), the cells responded similarly to the triple mutants suggesting that phosphorylation of T149 does not contribute greatly to the desensitization induced by 5-HT-mediated activation of PKC. Thus agonist-induced uncoupling of the 5-HT1A-receptor is PKC-dependent, but requires a different set of phosphorylation sites than phorbol ester-mediated PKC activation, suggesting differential recruitment of PKC. 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