Cytoplasmic calcium level and membrane fluidity of platelets contacting poly(acrylamide-co-methacrylic acid) particles with different surface properties.

N. Yui, K. Suzuki, T. Okano, Y. Sakurai, M. Nakano, C. Ishikawa, Keiji Fujimoto, H. Kawaguchi

Research output: Contribution to journalArticle

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Abstract

Changes in cytoplasmic free calcium levels and membrane fluidity of platelets in contact with poly(acrylamide-co-methacrylic acid) (PAAmMAc) particles were examined to analyze the mechanistic aspect of regulating platelet function. Our previous studies demonstrated interesting features of PAAmMAc particles during interaction with platelets: (1) PAAmMAc particles induce no calcium increase but enhance membrane fluidity of platelets: (2) thrombin induces no calcium increase in platelets when the platelets were mixed previously with PAAmMAc particles; and (3) PAAmMAc particles induce a calcium increase in platelets when they were treated previously with sodium azide (NaN3). These results suggest the possibility that PAAmMAc surfaces may regulate the calcium level by influencing platelet metabolism. In this study, non-cross-linked PAAmMAc solution with the same chemical composition as the particles showed a suppressive effect on thrombin-induced calcium increase, but, no influence on membrane fluidity. This result indicates that aggregated macromolecular surface assemblies of PAAmMAc may dominate the increase in membrane fluidity of platelets although the calcium change is induced by discrete molecular level interaction between the PAAmMAc and platelet membranes. It was also revealed that the suppression of thrombin-induced calcium increase and the membrane fluidity increase in platelets by PAAmMAc particles were reduced by albumin-treatment of the particles. This result suggests that such phenomena may be due to a decrease in any physicochemical interaction of PAAmMAc surfaces with albumin, rather than platelet metabolic change. PAAmMAc particle surfaces with higher carboxyl groups exhibited a more suppressive effect on thrombin-induced calcium increase, whereas those with lower carboxyl groups derived a higher calcium increase when the platelets were treated previously with NaN3. These results suggest the importance of electrostatic and any other physicochemical interaction of PAAmMAc chains on regulating cytoplasmic calcium levels.

Original languageEnglish
Pages (from-to)253-264
Number of pages12
JournalJournal of biomaterials science. Polymer edition
Volume7
Issue number3
Publication statusPublished - 1995

Fingerprint

Membrane Fluidity
Surface Properties
Fluidity
Acrylamide
Platelets
Polyacrylates
Surface properties
Calcium
Blood Platelets
Membranes
Acids
Thrombin
Sodium Azide
methacrylic acid
Albumins
Particle interactions
Static Electricity
Metabolism
Electrostatics

ASJC Scopus subject areas

  • Biophysics

Cite this

Cytoplasmic calcium level and membrane fluidity of platelets contacting poly(acrylamide-co-methacrylic acid) particles with different surface properties. / Yui, N.; Suzuki, K.; Okano, T.; Sakurai, Y.; Nakano, M.; Ishikawa, C.; Fujimoto, Keiji; Kawaguchi, H.

In: Journal of biomaterials science. Polymer edition, Vol. 7, No. 3, 1995, p. 253-264.

Research output: Contribution to journalArticle

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