Inhibition of K+ transport in human sickle cell erythrocytes by okadaic acid and sodium fluoride.
1. The effect of okadaic acid and sodium fluoride on swelling- and N-ethylmaleimide (NEM)-stimulated KCl cotransport was examined in blood cells from homozygote sickle cell anaemia patients. 2. Blood was drawn into heparin or EDTA by vein puncture from sickle cell patients previously diagnosed in the haematology clinics of Princess Badee'a Teaching Hospital. A standard method for measuring flux by using radioactive rubidium was used. 3. Okadaic acid strongly inhibited swelling-stimulated KCl cotransport if added before swelling. Okadaic acid and sodium fluoride added before NEM inhibited the activation of transport by NEM. Okadaic acid added after NEM did not inhibit transport. 4. The inhibition of the effects of NEM by okadaic acid and sodium fluoride indicates that activation of the flux by NEM requires the action of phosphatase.
al-Rohil Gharaibeh
N S
NS
Department of Physiology and Biochemistry, Princess Badee'a Teaching Hospital, Jordan University of Science and Technology, Irbid, Jordan. Nayef@Just.edu.Jo
al-Sheyyab
M
M
D000755:Anemia, Sickle Cell / Q000097:blood; D004305:Dose-Response Relationship, Drug; D004913:Erythrocytes, Abnormal / Q000187:drug effects* / Q000378:metabolism; D005033:Ethylmaleimide / Q000494:pharmacology; D006451:Hemoglobin, Sickle / Q000235:genetics; D006720:Homozygote; D006801:Humans; D017136:Ion Transport; D019319:Okadaic Acid / Q000494:pharmacology*; D011188:Potassium / Q000378:metabolism*; D012969:Sodium Fluoride / Q000494:pharmacology*
D006451:Hemoglobin, Sickle; D019319:Okadaic Acid; D012969:Sodium Fluoride; D005033:Ethylmaleimide; D011188:Potassium