Destabilisation and subsequent lysis of human erythrocytes induced by Plasmodium falciparum haem products
In falciparum malaria, both infected and uninfected red cells have structural and functional alterations. To investigate the mechanisms of these modifications, we studied the effects of two Plasmodium falciparum haem products (haematin and malaria pigment in the synthetic form beta-haematin) on isol...
Saved in:
Main Authors: | , , , , |
---|---|
Other Authors: | |
Format: | Article |
Published: |
2018
|
Subjects: | |
Online Access: | https://repository.li.mahidol.ac.th/handle/123456789/17019 |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Institution: | Mahidol University |
id |
th-mahidol.17019 |
---|---|
record_format |
dspace |
spelling |
th-mahidol.170192018-06-21T15:29:02Z Destabilisation and subsequent lysis of human erythrocytes induced by Plasmodium falciparum haem products Fausta Omodeo-Salè Anna Motti Arjen Dondorp Nicholas J. White Donatella Taramelli Universita degli Studi di Milano Mahidol University Churchill Hospital Facoltà di Farmacia Medicine In falciparum malaria, both infected and uninfected red cells have structural and functional alterations. To investigate the mechanisms of these modifications, we studied the effects of two Plasmodium falciparum haem products (haematin and malaria pigment in the synthetic form beta-haematin) on isolated human red blood cells (RBCs) and purified RBC ghosts. A dose- and time-dependent incorporation of haematin into RBC ghosts and intact cells was observed, which was in proportion to the extent of haematin- induced haemolysis. RBCs preincubated with haematin were more sensitive to haemolysis induced by hypotonic shock, low pH, H2O2 or haematin itself. Haemolysis was not related to membrane lipid peroxidation and only partially to oxidation of protein sulphydryl groups and it could not be prevented by scavengers of lipid peroxidation or hydroperoxide groups. N-acetylcysteine partly protected the oxidation of SH groups and significantly reduced haemolysis. In contrast, beta-haematin was neither haemolytic nor oxidative towards protein sulphydryl groups. Beta-haematin did destabilise the RBC membrane, but to a lesser extent than haematin, inducing increased susceptibility to lysis caused by hypotonic medium, H2O2 or haematin. This study suggests that the destabilising effect of haematin and, to a much less extent, beta-haematin on the RBC membrane does not result from oxidative damage of membrane lipids but from direct binding or incorporation which may affect the reciprocal interactions between the membrane and cytoskeleton proteins. These changes could contribute to the reduced red cell deformability associated with severe malaria. © Blackwell Munksgaard 2005. 2018-06-21T08:29:02Z 2018-06-21T08:29:02Z 2005-04-01 Article European Journal of Haematology. Vol.74, No.4 (2005), 324-332 10.1111/j.1600-0609.2004.00352.x 09024441 2-s2.0-16244365509 https://repository.li.mahidol.ac.th/handle/123456789/17019 Mahidol University SCOPUS https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=16244365509&origin=inward |
institution |
Mahidol University |
building |
Mahidol University Library |
continent |
Asia |
country |
Thailand Thailand |
content_provider |
Mahidol University Library |
collection |
Mahidol University Institutional Repository |
topic |
Medicine |
spellingShingle |
Medicine Fausta Omodeo-Salè Anna Motti Arjen Dondorp Nicholas J. White Donatella Taramelli Destabilisation and subsequent lysis of human erythrocytes induced by Plasmodium falciparum haem products |
description |
In falciparum malaria, both infected and uninfected red cells have structural and functional alterations. To investigate the mechanisms of these modifications, we studied the effects of two Plasmodium falciparum haem products (haematin and malaria pigment in the synthetic form beta-haematin) on isolated human red blood cells (RBCs) and purified RBC ghosts. A dose- and time-dependent incorporation of haematin into RBC ghosts and intact cells was observed, which was in proportion to the extent of haematin- induced haemolysis. RBCs preincubated with haematin were more sensitive to haemolysis induced by hypotonic shock, low pH, H2O2 or haematin itself. Haemolysis was not related to membrane lipid peroxidation and only partially to oxidation of protein sulphydryl groups and it could not be prevented by scavengers of lipid peroxidation or hydroperoxide groups. N-acetylcysteine partly protected the oxidation of SH groups and significantly reduced haemolysis. In contrast, beta-haematin was neither haemolytic nor oxidative towards protein sulphydryl groups. Beta-haematin did destabilise the RBC membrane, but to a lesser extent than haematin, inducing increased susceptibility to lysis caused by hypotonic medium, H2O2 or haematin. This study suggests that the destabilising effect of haematin and, to a much less extent, beta-haematin on the RBC membrane does not result from oxidative damage of membrane lipids but from direct binding or incorporation which may affect the reciprocal interactions between the membrane and cytoskeleton proteins. These changes could contribute to the reduced red cell deformability associated with severe malaria. © Blackwell Munksgaard 2005. |
author2 |
Universita degli Studi di Milano |
author_facet |
Universita degli Studi di Milano Fausta Omodeo-Salè Anna Motti Arjen Dondorp Nicholas J. White Donatella Taramelli |
format |
Article |
author |
Fausta Omodeo-Salè Anna Motti Arjen Dondorp Nicholas J. White Donatella Taramelli |
author_sort |
Fausta Omodeo-Salè |
title |
Destabilisation and subsequent lysis of human erythrocytes induced by Plasmodium falciparum haem products |
title_short |
Destabilisation and subsequent lysis of human erythrocytes induced by Plasmodium falciparum haem products |
title_full |
Destabilisation and subsequent lysis of human erythrocytes induced by Plasmodium falciparum haem products |
title_fullStr |
Destabilisation and subsequent lysis of human erythrocytes induced by Plasmodium falciparum haem products |
title_full_unstemmed |
Destabilisation and subsequent lysis of human erythrocytes induced by Plasmodium falciparum haem products |
title_sort |
destabilisation and subsequent lysis of human erythrocytes induced by plasmodium falciparum haem products |
publishDate |
2018 |
url |
https://repository.li.mahidol.ac.th/handle/123456789/17019 |
_version_ |
1763496298569269248 |