HIV protein, transactivator of transcription, alters circadian rhythms through the light entrainment pathway
Patients infected with the human immunodeficiency virus (HIV), and other mammals infected with related lentiviruses, exhibit fatigue, altered sleep patterns, and abnormal circadian rhythms. A circadian clock in the hypothalamic suprachiasmatic nucleus (SCN) temporally regulates these functions in mammals. We found that a secretary HIV transcription factor, transactivator of transcription (Tat), resets the murine circadian clock, in vitro and in vivo, at clinically relevant concentrations (EC(50) = 0.31 nM). This effect of Tat occurs only during the subjective night, when N-methyl-D-aspartate (NMDA) receptor [D-2-amino-5-phosphonovaleric acid (0.1 mM)] and nitric oxide synthase (N(G)-nitro-L-arginine methyl ester, 0.1 mM) inhibitors block Tat-induced phase shifts. Whole cell recordings of SCN neurons within the brain slice revealed that Tat did not activate NMDA receptors directly but potentiated NMDA receptor currents through the enhancement of glutamate release. Consistent with this presynaptic mechanism, inhibitors of neurotransmission block Tat-induced phase shifts, such as tetrodotoxin (1 microM), tetanus toxin (1 microM), P/Q/N type-calcium channel blockers (1 microM omega-agatoxin IVA and 1 microM omega-conotoxin GIVA) and bafilomycin A(1) (1 microM). Thus the effect of Tat on the SCN may underlie lentiviral circadian rhythm dysfunction by operating as a disease-dependent modulator of light entrainment through the enhancement of excitatory neurotransmission.
| Medienart: |
Artikel |
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| Erscheinungsjahr: |
2005 |
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| Erschienen: |
2005 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:289 |
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| Enthalten in: |
American journal of physiology. Regulatory, integrative and comparative physiology - 289(2005), 3 vom: 29. Sept., Seite R656-62 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Clark, J P [VerfasserIn] |
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| Anmerkungen: |
Date Completed 20.09.2005 Date Revised 30.09.2020 published: Print-Electronic Citation Status MEDLINE |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM15508576X |
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| 100 | 1 | |a Clark, J P |c 3rd |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a HIV protein, transactivator of transcription, alters circadian rhythms through the light entrainment pathway |
| 264 | 1 | |c 2005 | |
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| 500 | |a Date Completed 20.09.2005 | ||
| 500 | |a Date Revised 30.09.2020 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status MEDLINE | ||
| 520 | |a Patients infected with the human immunodeficiency virus (HIV), and other mammals infected with related lentiviruses, exhibit fatigue, altered sleep patterns, and abnormal circadian rhythms. A circadian clock in the hypothalamic suprachiasmatic nucleus (SCN) temporally regulates these functions in mammals. We found that a secretary HIV transcription factor, transactivator of transcription (Tat), resets the murine circadian clock, in vitro and in vivo, at clinically relevant concentrations (EC(50) = 0.31 nM). This effect of Tat occurs only during the subjective night, when N-methyl-D-aspartate (NMDA) receptor [D-2-amino-5-phosphonovaleric acid (0.1 mM)] and nitric oxide synthase (N(G)-nitro-L-arginine methyl ester, 0.1 mM) inhibitors block Tat-induced phase shifts. Whole cell recordings of SCN neurons within the brain slice revealed that Tat did not activate NMDA receptors directly but potentiated NMDA receptor currents through the enhancement of glutamate release. Consistent with this presynaptic mechanism, inhibitors of neurotransmission block Tat-induced phase shifts, such as tetrodotoxin (1 microM), tetanus toxin (1 microM), P/Q/N type-calcium channel blockers (1 microM omega-agatoxin IVA and 1 microM omega-conotoxin GIVA) and bafilomycin A(1) (1 microM). Thus the effect of Tat on the SCN may underlie lentiviral circadian rhythm dysfunction by operating as a disease-dependent modulator of light entrainment through the enhancement of excitatory neurotransmission | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Research Support, N.I.H., Extramural | |
| 650 | 4 | |a Research Support, U.S. Gov't, Non-P.H.S. | |
| 650 | 4 | |a Research Support, U.S. Gov't, P.H.S. | |
| 650 | 7 | |a Gene Products, tat |2 NLM | |
| 650 | 7 | |a Receptors, N-Methyl-D-Aspartate |2 NLM | |
| 650 | 7 | |a tat Gene Products, Human Immunodeficiency Virus |2 NLM | |
| 650 | 7 | |a tat peptide (1-72), Human immunodeficiency virus 1 |2 NLM | |
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| 700 | 1 | |a Sampair, Christopher S |e verfasserin |4 aut | |
| 700 | 1 | |a Kofuji, Paulo |e verfasserin |4 aut | |
| 700 | 1 | |a Nath, Avindra |e verfasserin |4 aut | |
| 700 | 1 | |a Ding, Jian M |e verfasserin |4 aut | |
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