Control of HCO3-Dependent Exchangers by Cyclic Nucleotides in Vascular Smooth Muscle Cells

  • Robert W. Putnam
  • Phyllis B. Douglas
  • Dianne Dewey
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 304)


A variety of membrane transport systems responsible for the regulation of intracellular pH (pHi) have been identified in smooth muscle (Aickin, 1986; Aalkjaer and Cragoe, 1988; Wray, 1988; Kikeri et al., 1990) and smooth musclelike cells (Boyarsky et al.,1988a,b; Putnam,1990). These include the ubiquitous Na/H exchanger and at least two HC03-dependent transport systems (Fig. 1): i) a putative alkalinizing (Na + HCO3)/C1 exchanger (although the role of Cl in this exchanger is still at issue) (Aickin and Brading, 1984; Aalkjaer and Mulvany, 1988); and ii) an acidifying Cl/HCO3 exchanger. While these exchangers are important for determining steady state pHi (Aalkjaer and Cragoe, 1988; Boyarsky et al., 1988a; Wray, 1988; Kikeri et al., 1990; Putnam and Grubbs, 1990), defending pHi against acid/base disturbances (Aalkjaer and Cragoe, 1988; Boyarsky et al., 1988b; Putnam, 1990) and mediating cellular responses to external signals (Berk et al., 1987; Ganz et al., 1989), only the Na/H exchanger has been extensively studied in regard to the factors which regulate its activity. In fact, the regulation of the HCO3-dependent transport systems is poorly studied in any cell.


Vascular Smooth Muscle Cell Aortic Smooth Muscle Cell Vascular Smooth Muscle Cell Function Cellular Alkalinization Adenylate Cyclase Activator Forskolin 
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Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • Robert W. Putnam
    • 1
  • Phyllis B. Douglas
    • 1
  • Dianne Dewey
    • 1
  1. 1.Department of Physiology and BiophysicsWright State University School of MedicineDaytonUSA

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