Voltage‐sensitive conductances increase the sensitivity of rod photoresponses following pigment bleaching
Key points Following substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of the rod outer segment photocurrent. The block of cation conductances during the internal dialysis of Cs+ further desensitizes the photovoltage...
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| Published in: | The Journal of physiology Vol. 595; no. 11; pp. 3459 - 3469 |
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| Main Authors: | , , , , , |
| Format: | Journal Article |
| Language: | English |
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01.06.2017
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| ISSN: | 0022-3751, 1469-7793, 1469-7793 |
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| Abstract | Key points
Following substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of the rod outer segment photocurrent.
The block of cation conductances during the internal dialysis of Cs+ further desensitizes the photovoltage thereby eliminating its difference in desensitization with the rod outer segment photocurrent.
Bleached visual pigment produced an acceleration of the rod photovoltage with respect to the outer segment photocurrent, which is eliminated upon internal dialysis of Cs+.
A majority of our visual experience occurs during the day when a substantial fraction of the visual pigment in our photoreceptor cells is bleached. Under these conditions it is widely believed that rods are saturated and do not contribute substantially to downstream signalling. However, behavioural experiments on subjects with only rod function reveals that these individuals unexpectedly retain substantial vision in daylight. We sought to understand this discrepancy by characterizing the sensitivity of rod photoresponses following exposure to bright bleaching light. Measurements of the rod outer segment photocurrent in transgenic mice, which have only rod function, revealed the well‐studied reduction in the sensitivity of rod photoresponses following pigment bleaching. However, membrane voltage measurements showed that the desensitization of the photovoltage was considerably less than that of the outer segment photocurrent following equivalent pigment bleaching. This discrepancy was largely eliminated during the blockade of cation channels due to the internal dialysis of Cs+, which increased the bleach‐induced desensitization of the photovoltage and slowed its temporal characteristics. Thus, sensitization of the photovoltage by rod inner segment conductances appears to extend the operating range of rod phototransduction following pigment bleaching.
Key points
Following substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of the rod outer segment photocurrent.
The block of cation conductances during the internal dialysis of Cs+ further desensitizes the photovoltage thereby eliminating its difference in desensitization with the rod outer segment photocurrent.
Bleached visual pigment produced an acceleration of the rod photovoltage with respect to the outer segment photocurrent, which is eliminated upon internal dialysis of Cs+. |
|---|---|
| AbstractList | Following substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of the rod outer segment photocurrent.
The block of cation conductances during the internal dialysis of Cs
+
further desensitizes the photovoltage thereby eliminating its difference in desensitization with the rod outer segment photocurrent.
Bleached visual pigment produced an acceleration of the rod photovoltage with respect to the outer segment photocurrent, which is eliminated upon internal dialysis of Cs
+
. Following substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of the rod outer segment photocurrent. The block of cation conductances during the internal dialysis of Cs further desensitizes the photovoltage thereby eliminating its difference in desensitization with the rod outer segment photocurrent. Bleached visual pigment produced an acceleration of the rod photovoltage with respect to the outer segment photocurrent, which is eliminated upon internal dialysis of Cs . A majority of our visual experience occurs during the day when a substantial fraction of the visual pigment in our photoreceptor cells is bleached. Under these conditions it is widely believed that rods are saturated and do not contribute substantially to downstream signalling. However, behavioural experiments on subjects with only rod function reveals that these individuals unexpectedly retain substantial vision in daylight. We sought to understand this discrepancy by characterizing the sensitivity of rod photoresponses following exposure to bright bleaching light. Measurements of the rod outer segment photocurrent in transgenic mice, which have only rod function, revealed the well-studied reduction in the sensitivity of rod photoresponses following pigment bleaching. However, membrane voltage measurements showed that the desensitization of the photovoltage was considerably less than that of the outer segment photocurrent following equivalent pigment bleaching. This discrepancy was largely eliminated during the blockade of cation channels due to the internal dialysis of Cs , which increased the bleach-induced desensitization of the photovoltage and slowed its temporal characteristics. Thus, sensitization of the photovoltage by rod inner segment conductances appears to extend the operating range of rod phototransduction following pigment bleaching. Following substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of the rod outer segment photocurrent. The block of cation conductances during the internal dialysis of Cs+ further desensitizes the photovoltage thereby eliminating its difference in desensitization with the rod outer segment photocurrent. Bleached visual pigment produced an acceleration of the rod photovoltage with respect to the outer segment photocurrent, which is eliminated upon internal dialysis of Cs+ .KEY POINTSFollowing substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of the rod outer segment photocurrent. The block of cation conductances during the internal dialysis of Cs+ further desensitizes the photovoltage thereby eliminating its difference in desensitization with the rod outer segment photocurrent. Bleached visual pigment produced an acceleration of the rod photovoltage with respect to the outer segment photocurrent, which is eliminated upon internal dialysis of Cs+ .A majority of our visual experience occurs during the day when a substantial fraction of the visual pigment in our photoreceptor cells is bleached. Under these conditions it is widely believed that rods are saturated and do not contribute substantially to downstream signalling. However, behavioural experiments on subjects with only rod function reveals that these individuals unexpectedly retain substantial vision in daylight. We sought to understand this discrepancy by characterizing the sensitivity of rod photoresponses following exposure to bright bleaching light. Measurements of the rod outer segment photocurrent in transgenic mice, which have only rod function, revealed the well-studied reduction in the sensitivity of rod photoresponses following pigment bleaching. However, membrane voltage measurements showed that the desensitization of the photovoltage was considerably less than that of the outer segment photocurrent following equivalent pigment bleaching. This discrepancy was largely eliminated during the blockade of cation channels due to the internal dialysis of Cs+ , which increased the bleach-induced desensitization of the photovoltage and slowed its temporal characteristics. Thus, sensitization of the photovoltage by rod inner segment conductances appears to extend the operating range of rod phototransduction following pigment bleaching.ABSTRACTA majority of our visual experience occurs during the day when a substantial fraction of the visual pigment in our photoreceptor cells is bleached. Under these conditions it is widely believed that rods are saturated and do not contribute substantially to downstream signalling. However, behavioural experiments on subjects with only rod function reveals that these individuals unexpectedly retain substantial vision in daylight. We sought to understand this discrepancy by characterizing the sensitivity of rod photoresponses following exposure to bright bleaching light. Measurements of the rod outer segment photocurrent in transgenic mice, which have only rod function, revealed the well-studied reduction in the sensitivity of rod photoresponses following pigment bleaching. However, membrane voltage measurements showed that the desensitization of the photovoltage was considerably less than that of the outer segment photocurrent following equivalent pigment bleaching. This discrepancy was largely eliminated during the blockade of cation channels due to the internal dialysis of Cs+ , which increased the bleach-induced desensitization of the photovoltage and slowed its temporal characteristics. Thus, sensitization of the photovoltage by rod inner segment conductances appears to extend the operating range of rod phototransduction following pigment bleaching. Following substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of the rod outer segment photocurrent.The block of cation conductances during the internal dialysis of Cs+ further desensitizes the photovoltage thereby eliminating its difference in desensitization with the rod outer segment photocurrent.Bleached visual pigment produced an acceleration of the rod photovoltage with respect to the outer segment photocurrent, which is eliminated upon internal dialysis of Cs+. Key points Following substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of the rod outer segment photocurrent. The block of cation conductances during the internal dialysis of Cs+ further desensitizes the photovoltage thereby eliminating its difference in desensitization with the rod outer segment photocurrent. Bleached visual pigment produced an acceleration of the rod photovoltage with respect to the outer segment photocurrent, which is eliminated upon internal dialysis of Cs+. A majority of our visual experience occurs during the day when a substantial fraction of the visual pigment in our photoreceptor cells is bleached. Under these conditions it is widely believed that rods are saturated and do not contribute substantially to downstream signalling. However, behavioural experiments on subjects with only rod function reveals that these individuals unexpectedly retain substantial vision in daylight. We sought to understand this discrepancy by characterizing the sensitivity of rod photoresponses following exposure to bright bleaching light. Measurements of the rod outer segment photocurrent in transgenic mice, which have only rod function, revealed the well-studied reduction in the sensitivity of rod photoresponses following pigment bleaching. However, membrane voltage measurements showed that the desensitization of the photovoltage was considerably less than that of the outer segment photocurrent following equivalent pigment bleaching. This discrepancy was largely eliminated during the blockade of cation channels due to the internal dialysis of Cs+, which increased the bleach-induced desensitization of the photovoltage and slowed its temporal characteristics. Thus, sensitization of the photovoltage by rod inner segment conductances appears to extend the operating range of rod phototransduction following pigment bleaching. Key points Following substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of the rod outer segment photocurrent. The block of cation conductances during the internal dialysis of Cs+ further desensitizes the photovoltage thereby eliminating its difference in desensitization with the rod outer segment photocurrent. Bleached visual pigment produced an acceleration of the rod photovoltage with respect to the outer segment photocurrent, which is eliminated upon internal dialysis of Cs+. Key points Following substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of the rod outer segment photocurrent. The block of cation conductances during the internal dialysis of Cs+ further desensitizes the photovoltage thereby eliminating its difference in desensitization with the rod outer segment photocurrent. Bleached visual pigment produced an acceleration of the rod photovoltage with respect to the outer segment photocurrent, which is eliminated upon internal dialysis of Cs+. A majority of our visual experience occurs during the day when a substantial fraction of the visual pigment in our photoreceptor cells is bleached. Under these conditions it is widely believed that rods are saturated and do not contribute substantially to downstream signalling. However, behavioural experiments on subjects with only rod function reveals that these individuals unexpectedly retain substantial vision in daylight. We sought to understand this discrepancy by characterizing the sensitivity of rod photoresponses following exposure to bright bleaching light. Measurements of the rod outer segment photocurrent in transgenic mice, which have only rod function, revealed the well‐studied reduction in the sensitivity of rod photoresponses following pigment bleaching. However, membrane voltage measurements showed that the desensitization of the photovoltage was considerably less than that of the outer segment photocurrent following equivalent pigment bleaching. This discrepancy was largely eliminated during the blockade of cation channels due to the internal dialysis of Cs+, which increased the bleach‐induced desensitization of the photovoltage and slowed its temporal characteristics. Thus, sensitization of the photovoltage by rod inner segment conductances appears to extend the operating range of rod phototransduction following pigment bleaching. Key points Following substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of the rod outer segment photocurrent. The block of cation conductances during the internal dialysis of Cs+ further desensitizes the photovoltage thereby eliminating its difference in desensitization with the rod outer segment photocurrent. Bleached visual pigment produced an acceleration of the rod photovoltage with respect to the outer segment photocurrent, which is eliminated upon internal dialysis of Cs+. |
| Author | Miyagishima, Kiyoharu J. Frederiksen, Rikard Cornwall, M. Carter Sampath, Alapakkam P. Pahlberg, Johan Pollock, Gabriel E. |
| AuthorAffiliation | 2 Physiology and Biophysics Boston University School of Medicine Boston MA 02118 USA 1 Ophthalmology, Stein Eye Institute University of California Los Angeles CA 90095 USA 3 Unit on Retinal Neurophysiology, National Eye Institute Intramural Program National Institutes of Health Bethesda MD 20892 USA |
| AuthorAffiliation_xml | – name: 2 Physiology and Biophysics Boston University School of Medicine Boston MA 02118 USA – name: 3 Unit on Retinal Neurophysiology, National Eye Institute Intramural Program National Institutes of Health Bethesda MD 20892 USA – name: 1 Ophthalmology, Stein Eye Institute University of California Los Angeles CA 90095 USA |
| Author_xml | – sequence: 1 givenname: Johan orcidid: 0000-0002-4038-9693 surname: Pahlberg fullname: Pahlberg, Johan organization: University of California – sequence: 2 givenname: Rikard surname: Frederiksen fullname: Frederiksen, Rikard organization: Boston University School of Medicine – sequence: 3 givenname: Gabriel E. surname: Pollock fullname: Pollock, Gabriel E. organization: University of California – sequence: 4 givenname: Kiyoharu J. surname: Miyagishima fullname: Miyagishima, Kiyoharu J. organization: National Institutes of Health – sequence: 5 givenname: Alapakkam P. orcidid: 0000-0002-0785-9577 surname: Sampath fullname: Sampath, Alapakkam P. email: asampath@jsei.ucla.edu organization: University of California – sequence: 6 givenname: M. Carter surname: Cornwall fullname: Cornwall, M. Carter email: cornwall@bu.edu organization: Boston University School of Medicine |
| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/28168711$$D View this record in MEDLINE/PubMed |
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| CitedBy_id | crossref_primary_10_1038_s41598_018_34073_8 crossref_primary_10_1523_JNEUROSCI_2817_20_2021 crossref_primary_10_1016_j_preteyeres_2019_05_001 crossref_primary_10_1016_j_cub_2019_01_042 crossref_primary_10_1007_s00424_021_02551_0 crossref_primary_10_1016_j_cophys_2020_05_003 crossref_primary_10_1073_pnas_2001776117 crossref_primary_10_1038_s41467_020_17113_8 crossref_primary_10_1093_hmg_ddz171 crossref_primary_10_1038_s41467_017_01816_6 crossref_primary_10_1167_iovs_66_2_52 crossref_primary_10_1038_s41598_025_95998_5 crossref_primary_10_1088_1741_2552_abdd42 crossref_primary_10_3389_fcell_2024_1332944 crossref_primary_10_1007_s12035_023_03873_z crossref_primary_10_1113_JP274146 crossref_primary_10_1016_j_cub_2018_02_062 crossref_primary_10_1016_j_exer_2018_02_024 crossref_primary_10_1016_j_jbc_2021_101401 |
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| Keywords | adaptation rod photoreceptor photovoltage retina photocurrent |
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Following substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of... Following substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of the rod... Key points Following substantial bleaching of the visual pigment, the desensitization of the rod photovoltage is not as substantial as the desensitization of... |
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| SubjectTerms | Action Potentials adaptation Animals Bleaching Cells, Cultured Cesium - pharmacology Dialysis Hemodialysis Mice Mice, Inbred C57BL Neuroscience ‐ Cellular/Molecular photocurrent Photopigments Photoresponse Phototransduction photovoltage Research Paper retina Retinal Pigments - metabolism Retinal Rod Photoreceptor Cells - drug effects Retinal Rod Photoreceptor Cells - metabolism Retinal Rod Photoreceptor Cells - physiology Rod outer segment membranes rod photoreceptor Rods Transgenic mice Vision, Ocular Visual perception Voltage |
| Title | Voltage‐sensitive conductances increase the sensitivity of rod photoresponses following pigment bleaching |
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