A monoclonal antibody (LK-4) which differentiates PLA1 from PLA2 platelet extracts but not intact platelets. |
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| Authors: | L X Liu M A Nardi F Flug S Karpatkin |
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| Affiliation: | Department of Medicine, New York University Medical Center, N.Y. 10016. |
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| Abstract: | A unique murine monoclonal antibody (LK-4) is described which differentiates PLA1/PLA1 platelet extracts from PLA2/PLA2 and PLA1/PLA2 platelet extracts on solid phase ELISA and immunoblot at the 100kD GPIIIa location, but not on intact platelets. LK-4 reacts equally with intact PLA1/PLA2 and PLA2/PLA2 platelets. Adsorbtion of LK-4 with PLA1/PLA1 platelets results in loss of reactivity for intact platelets as well as platelet extracts on ELISA or immunoblot. LK-4 inhibits platelet aggregation induced by ADP, epinephrine, collagen and thrombin, suggesting reactivity at or near the fibrinogen binding site on GPIIIa. It is suggested the LK-4 reacts with a conformation-induced common epitope for PLA1 and PLA2 on GPIIIa, with loss of this conformation for PLA2 GPIIIa following solubilization with Triton X-100. |
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