title: The myocardial interstitium: its structure and its role in ionic exchange.
abstract: The structures present in the rabbit myocardial interstitium have been defined and quantified. Stereological methods were used for the quantification. The extracellular space contains abundant ground substance (23%) distributed in a homogeneous mat throughout the space and within the T tubules. The remainder of the space contains 59% blood vessels, 6% "empty" space, 4.0% collagen, and 7.0% connective tissue cells. The arrangement of the interstitium in relation to the myocardial cells and the capillaries has been described. In addition, the extracellular space was measured using extracellular markers: (14)C sucrose (neutrally charged), (35)SO(4) (negatively charged), and (140)La (positively charged). The La(+++) space differed markedly from the other two (P << 0.001), indicating extensive binding of La(+++) to polyanionic extracellular structures. Cetylpyridinium chloride, a cationic detergent specific for polysaccharides, caused precipitation of the ground substance and marked decrease in the La(+++) space. This study indicates the considerable structural complexity of the interstitium. The effects of an abundant negatively charged protein-polysaccharide within the interstitium has been discussed in terms of cation exchange in arterially perfused tissue.
mesh_terms: D000818:Animals; D001665:Binding Sites; D001692:Biological Transport; D002250:Carbon Radioisotopes; D003902:Detergents; D005110:Extracellular Space; D006321:Heart / Q000033:anatomy & histology*; D006651:Histocytochemistry; D007811:Lanthanum / Q000378:metabolism; D008854:Microscopy, Electron; D009206:Myocardium / Q000166:cytology / Q000378:metabolism*; D010477:Perfusion; D011817:Rabbits; D011868:Radioisotopes; D011955:Receptors, Drug; D013395:Sucrose / Q000378:metabolism; D013431:Sulfates / Q000378:metabolism; D013462:Sulfur Radioisotopes
chemical_list: D002250:Carbon Radioisotopes; D003902:Detergents; D011868:Radioisotopes; D011955:Receptors, Drug; D013431:Sulfates; D013462:Sulfur Radioisotopes; D013395:Sucrose; D007811:Lanthanum