Also, the influx of Ca2+ into the cytoplasm, an early event in cold stress, may be mediated by Ca2+ channels that are activated by membrane rigidification, ligands, or mechanical stimuli (Chinnusamy et al. [2006]).
This decrease was accompanied by an enrichment in free sterols which was interpreted as a mechanism of drought adaptation based on sterol-induced membrane rigidification.
Additionally, membrane rigidification in certain membrane domains could lead to lateral membrane heterogeneity with regions of low tension in between different domains that the peptide may use to more easily perturb the membrane as suggested by different studies [51] [53].
Cholesterol incorporation resulted in a decrease in the CLA of the PDC-109/DMPC recombinants, which could be attributed to membrane rigidification, or to direct interaction of cholesterol with the CRAC domain of PDC-109.
Similarly, the median level of rigidity of erythrocytes infected with FIKK12-KO parasites was also lower than those infected with FCR3 but the difference did not quite reach statistical significance at the 95% confidence level (P = 0.06) These suggest that both FIKK7.1 and FIKK12 play a role in modulating the overall level of membrane rigidification induced by P. falciparum infection.
Membrane rigidification leads to an increase in the cytosolic concentration of the Ca2+ ion [ 15], which is regarded as a major regulator of low temperature responsive factor.
The recent findings support the hypothesis that plant cells can perceive cold stress and subsequently trigger the production of second messengers, such as Ca2+ via membrane rigidification [ 7].
Nevertheless, early changes in membrane rigidification leading to certain cytoskeletal rearrangement has been proposed to be a cellular sensor for cold stress, in addition to metabolic or redox status alterations.
Thus, compared with the MWCNTs/GO membrane, the PDDA-MWCNTs/GO membrane caused a more pronounced decrease in absorption intensity.
2. Membrane stress caused by direct contact with sharp edges.
