Exploring the Potential Roles of Band 3 and Aquaporin-1 in Blood CO Transport-Inspired by Comparative Studies of Glycophorin B-A-B Hybrid Protein GP.Mur

Overview

Journal Front Physiol

Date 2018 Jul 5

PMID 29971013

Citations 12

Authors

Kate Hsu

Affiliations

Soon will be listed here.

Abstract

The Cl/HCO exchanger band 3 is functionally relevant to blood CO transport. Band 3 is the most abundant membrane protein in human red blood cells (RBCs). Our understanding of its physiological functions mainly came from clinical cases associated with band 3 mutations. Severe reduction in band 3 expression affects blood HCO/CO metabolism. What could happen physiologically if band 3 expression is elevated instead? In some areas of Southeast Asia, about 1-10% of the populations express GP.Mur, a glycophorin B-A-B hybrid membrane protein important in the field of transfusion medicine. GP.Mur functions to promote band 3 expression, and GP.Mur red cells can be deemed as a naturally occurred model for higher band 3 expression. This review first compares the functional consequences of band 3 at different levels, and suggests a critical role of band 3 in postnatal CO respiration. The second part of the review explores the transport of water, which is the other substrate for intra-erythrocytic CO/HCO conversion (an essential step in blood CO transport). Despite that water is considered unlimited physiologically, it is unclear whether water channel aquaporin-1 (AQP1) abundantly expressed in RBCs is functionally involved in CO transport. Research in this area is complicated by the fact that the HO/CO-transporting function of AQP1 is replaceable by other erythrocyte channels/transporters (e.g., UT-B/GLUT1 for HO; RhAG for CO). Recently, using carbonic anhydrase II (CAII)-filled erythrocyte vesicles, AQP1 has been demonstrated to transport water for the CAII-mediated reaction, CO + HO ⇌ HCO + H. AQP1 is structurally associated with some population of band 3 complexes on the erythrocyte membrane in an osmotically responsive fashion. The current findings reveal transient interaction among components within the band 3-central, CO-transport metabolon (AQP1, band 3, CAII and deoxygenated hemoglobin). Their dynamic interaction is envisioned to facilitate blood CO respiration, in the presence of constantly changing osmotic and hemodynamic stresses during circulation.

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