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Selective elimination of malaria infected erythrocytes by a modified phospholipase A2 in vitro
G N Moll1, H J Vial, F C van der Wiele
1C.B.L.E., State University of Utrecht, The Netherlands.
Abstract:
Pig pancreatic phospholipase A2 does not act on normal erythrocytes, but the membrane penetrating capacity is enhanced by the covalent attachment of one fatty acyl chain to Lys-116 of the enzyme. Taking advantage of the impaired packing of phospholipids in the membrane of Plasmodium infected erythrocytes it was demonstrated that a lauric acid derivative of phospholipase A2 is capable of exclusively attaching the infected erythrocytes in vitro, leaving the uninfected cells undisturbed. The chemically modified phospholipase A2 appeared to cause death of the parasite in cell cultures of infected erythrocytes.
Insights
Modified pig pancreatic phospholipase A2 selectively targets Plasmodium-infected erythrocytes. This fatty acid-enhanced enzyme shows potential for treating malaria by causing parasite death in infected red blood cells.
Area of Science:
- Biochemistry
- Parasitology
- Medicinal Chemistry
Background:
- Phospholipase A2 (PLA2) enzymes are crucial in lipid metabolism.
- Normal erythrocytes are resistant to pig pancreatic PLA2.
- Altered erythrocyte membranes in Plasmodium infection present a potential therapeutic target.
Purpose of the Study:
- To investigate the membrane-penetrating capacity of pig pancreatic PLA2.
- To develop a modified PLA2 derivative for selective targeting of infected erythrocytes.
- To assess the efficacy of the modified PLA2 in eliminating Plasmodium parasites.
Main Methods:
- Covalent attachment of a fatty acyl chain to Lys-116 of pig pancreatic PLA2 to enhance membrane penetration.
- Utilizing the unique phospholipid packing in Plasmodium-infected erythrocytes.
- In vitro incubation of infected erythrocytes with the lauric acid derivative of PLA2.
Main Results:
- Chemically modified PLA2 demonstrated enhanced membrane-penetrating capacity.
- The modified enzyme selectively attached to infected erythrocytes, sparing uninfected cells.
- The modified PLA2 induced parasite death in infected erythrocyte cultures.
Conclusions:
- Fatty acid modification of pig pancreatic PLA2 enhances its ability to target infected erythrocytes.
- This selective targeting offers a potential strategy for malaria treatment.
- The modified enzyme shows promise in killing Plasmodium parasites within host cells.