title: [Temperature denaturation of erythrocyte spectrin: rheology, deformability and resistance to detergents].
abstract: Detergent resistance of erythrocytes and viscosity of whole blood altered sharply already on the first stages of spectrin denaturation process (46-48 degrees C). Alternatively, deformability changes arise above 50 degrees C. Further insignificant increase in viscosity proceeded above 50 degrees C. Yield stress decreased to zero at t < 50 degrees C and at higher temperatures suspension demonstrated Newton's behavior. So, the following order of events can be seen: 1) the initial stages of denaturation process (46-48 degrees C) lead to shape modifications of erythrocytes (spicula formation on the cell rim-echinocytosis), with the detergent resistance of erythrocytes decreasing significantly and capability of echinocytes to aggregate with fibrinogen participation being lost. 2) Above 50 degrees C vesiculation and spherulation of erythrocytes lead to a sharp alteration of deformability with an insignificant increase of viscosity. Thus, deformability of erythrocytes, which is a very important factor in the capillary circulation, may be of lesser rheological role in large vessels.
authors.forename: I V
authors.initials: IV
authors.lastname: Iamaĭkina
authors.forename: V A
authors.initials: VA
authors.lastname: Mansurov
authors.forename: E V
authors.initials: EV
authors.lastname: Ivashkevich
mesh_terms: D003902:Detergents / Q000494:pharmacology*; D004912:Erythrocytes / Q000737:chemistry*; D006801:Humans; D011489:Protein Denaturation; D013049:Spectrin / Q000737:chemistry* / Q000187:drug effects; D013696:Temperature
chemical_list: D003902:Detergents; D013049:Spectrin