Sulfate uptake by crustacean hepatopancreatic brush border membrane vesicles. [Homarus americanus]

Conference · Sun Feb 25 23:00:00 EST 1990 · FASEB Journal (Federation of American Societies for Experimental Biology); (United States)

OSTI ID:5489194

Gerencser, G A; Cattey, M A; Ahearn, G A ^[1]

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1. Univ. of Florida, Gainesville (United States) Univ. of Hawaii, Honolulu (United States)

Purified brush border membrane vesicles (BBMV) were prepared from Atlantic lobster (Homarus americanus) hepatopancreas using differential centrifugation and Mg{sup +2} precipitation techniques. Uptake of 0.1 mM {sup 35}SO{sub 4}{sup {minus}2} was stimulated by pre-loading vesicles with Cl{sup {minus}} leading to a transient accumulation of isotope more than twice that at equilibrium. Pre-loading with HCO{sub 3}{sup {minus}} or gluconate had no effect on sulfate uptake. No stimulation of {sup 35}SO{sub 4}{sup {minus}2} was observed in the presence of inwardly directed Na{sup +} or tetramethylammonium{sup +} gradients. Uptake of the divalent anion was strongly stimulated by inwardly directed proton gradients (pH{sub o} < pH{sub i}) and markedly inhibited by outwardly directed proton gradients (pH{sub o} > pH{sub i}). {sup 35}SO{sub 4}{sup {minus}2}/Cl{sup {minus}} exchange was enhanced by imposing a transmembrane inside positive K{sup +} diffusion potential and inhibited by a membrane potential of the opposite polarity (K{sup +}/valinomycin). Results suggest the presence of a proton-dependent, electrogenic anion antiport mechanism in BBMV isolated from the crustacean hepatopancreas.

• OSTI ID: 5489194
• Report Number(s): CONF-9004153--
• Journal Information: FASEB Journal (Federation of American Societies for Experimental Biology); (United States), Journal Name: FASEB Journal (Federation of American Societies for Experimental Biology); (United States) Vol. 4:3; ISSN FAJOE; ISSN 0892-6638
• Country of Publication: United States
• Language: English

Related Subjects

550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ALKALI METAL COMPOUNDS
ANIMALS
AQUATIC ORGANISMS
ARTHROPODS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BODY
CHLORINE COMPOUNDS
CRUSTACEANS
DAYS LIVING RADIOISOTOPES
DECAPODS
DIGESTIVE SYSTEM
ENDOCRINE GLANDS
EVEN-ODD NUCLEI
GLANDS
HALOGEN COMPOUNDS
INVERTEBRATES
ISOTOPE APPLICATIONS
ISOTOPES
LIGHT NUCLEI
LIVER
LOBSTERS
MEMBRANE TRANSPORT
NUCLEI
ORGANS
OXYGEN COMPOUNDS
PANCREAS
PHYSIOLOGY
POTASSIUM COMPOUNDS
RADIOISOTOPES
SULFATES
SULFUR 35
SULFUR COMPOUNDS
SULFUR ISOTOPES
TRACER TECHNIQUES
UPTAKE