Cargando…
An AFM Approach Applied in a Study of α-Crystallin Membrane Association: New Insights into Lens Hardening and Presbyopia Development
The lens of the eye loses elasticity with age, while α-crystallin association with the lens membrane increases with age. It is unclear whether there is any correlation between α-crystallin association with the lens membrane and loss in lens elasticity. This research investigated α-crystallin membran...
Autores principales: | , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9146655/ https://www.ncbi.nlm.nih.gov/pubmed/35629848 http://dx.doi.org/10.3390/membranes12050522 |
_version_ | 1784716616232075264 |
---|---|
author | Khadka, Nawal K. Timsina, Raju Mainali, Laxman |
author_facet | Khadka, Nawal K. Timsina, Raju Mainali, Laxman |
author_sort | Khadka, Nawal K. |
collection | PubMed |
description | The lens of the eye loses elasticity with age, while α-crystallin association with the lens membrane increases with age. It is unclear whether there is any correlation between α-crystallin association with the lens membrane and loss in lens elasticity. This research investigated α-crystallin membrane association using atomic force microscopy (AFM) for the first time to study topographical images and mechanical properties (breakthrough force and membrane area compressibility modulus (K(A)), as measures of elasticity) of the membrane. α-Crystallin extracted from the bovine lens cortex was incubated with a supported lipid membrane (SLM) prepared on a flat mica surface. The AFM images showed the time-dependent interaction of α-crystallin with the SLM. Force spectroscopy revealed the presence of breakthrough events in the force curves obtained in the membrane regions where no α-crystallin was associated, which suggests that the membrane’s elasticity was maintained. The force curves in the α-crystallin submerged region and the close vicinity of the α-crystallin associated region in the membrane showed no breakthrough event within the defined peak force threshold, indicating loss of membrane elasticity. Our results showed that the association of α-crystallin with the membrane deteriorates membrane elasticity, providing new insights into understanding the molecular basis of lens hardening and presbyopia. |
format | Online Article Text |
id | pubmed-9146655 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-91466552022-05-29 An AFM Approach Applied in a Study of α-Crystallin Membrane Association: New Insights into Lens Hardening and Presbyopia Development Khadka, Nawal K. Timsina, Raju Mainali, Laxman Membranes (Basel) Communication The lens of the eye loses elasticity with age, while α-crystallin association with the lens membrane increases with age. It is unclear whether there is any correlation between α-crystallin association with the lens membrane and loss in lens elasticity. This research investigated α-crystallin membrane association using atomic force microscopy (AFM) for the first time to study topographical images and mechanical properties (breakthrough force and membrane area compressibility modulus (K(A)), as measures of elasticity) of the membrane. α-Crystallin extracted from the bovine lens cortex was incubated with a supported lipid membrane (SLM) prepared on a flat mica surface. The AFM images showed the time-dependent interaction of α-crystallin with the SLM. Force spectroscopy revealed the presence of breakthrough events in the force curves obtained in the membrane regions where no α-crystallin was associated, which suggests that the membrane’s elasticity was maintained. The force curves in the α-crystallin submerged region and the close vicinity of the α-crystallin associated region in the membrane showed no breakthrough event within the defined peak force threshold, indicating loss of membrane elasticity. Our results showed that the association of α-crystallin with the membrane deteriorates membrane elasticity, providing new insights into understanding the molecular basis of lens hardening and presbyopia. MDPI 2022-05-14 /pmc/articles/PMC9146655/ /pubmed/35629848 http://dx.doi.org/10.3390/membranes12050522 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Communication Khadka, Nawal K. Timsina, Raju Mainali, Laxman An AFM Approach Applied in a Study of α-Crystallin Membrane Association: New Insights into Lens Hardening and Presbyopia Development |
title | An AFM Approach Applied in a Study of α-Crystallin Membrane Association: New Insights into Lens Hardening and Presbyopia Development |
title_full | An AFM Approach Applied in a Study of α-Crystallin Membrane Association: New Insights into Lens Hardening and Presbyopia Development |
title_fullStr | An AFM Approach Applied in a Study of α-Crystallin Membrane Association: New Insights into Lens Hardening and Presbyopia Development |
title_full_unstemmed | An AFM Approach Applied in a Study of α-Crystallin Membrane Association: New Insights into Lens Hardening and Presbyopia Development |
title_short | An AFM Approach Applied in a Study of α-Crystallin Membrane Association: New Insights into Lens Hardening and Presbyopia Development |
title_sort | afm approach applied in a study of α-crystallin membrane association: new insights into lens hardening and presbyopia development |
topic | Communication |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9146655/ https://www.ncbi.nlm.nih.gov/pubmed/35629848 http://dx.doi.org/10.3390/membranes12050522 |
work_keys_str_mv | AT khadkanawalk anafmapproachappliedinastudyofacrystallinmembraneassociationnewinsightsintolenshardeningandpresbyopiadevelopment AT timsinaraju anafmapproachappliedinastudyofacrystallinmembraneassociationnewinsightsintolenshardeningandpresbyopiadevelopment AT mainalilaxman anafmapproachappliedinastudyofacrystallinmembraneassociationnewinsightsintolenshardeningandpresbyopiadevelopment AT khadkanawalk afmapproachappliedinastudyofacrystallinmembraneassociationnewinsightsintolenshardeningandpresbyopiadevelopment AT timsinaraju afmapproachappliedinastudyofacrystallinmembraneassociationnewinsightsintolenshardeningandpresbyopiadevelopment AT mainalilaxman afmapproachappliedinastudyofacrystallinmembraneassociationnewinsightsintolenshardeningandpresbyopiadevelopment |