Fate of blood meal iron in mosquitoes.
Autor(es): Zhou Guoli; Kohlhepp Pete; Geiser Dawn; Frasquillo Maria Del Carmen; Vazquez-Moreno Luz; Winzerling Joy J
Resumo: Iron is an essential element of living cells and organisms as a component of numerous metabolic pathways. Hemoglobin and ferric-transferrin in vertebrate host blood are the two major iron sources for female mosquitoes. We used inductively coupled plasma mass spectrometry (ICP-MS) and radioisotope labeling to quantify the fate of iron supplied from hemoglobin or as transferrin in Aedes aegypti. At the end of the first gonotrophic cycle, approximately 87% of the ingested total meal heme iron was excreted, while 7% was distributed into the eggs and 6% was stored in different tissues. In contrast, approximately 8% of the iron provided as transferrin was excreted and of that absorbed, 77% was allocated to the eggs and 15% distributed in the tissues. Further analyses indicate that of the iron supplied in a blood meal, approximately 7% appears in the eggs and of this iron 98% is from hemoglobin and 2% from ferric-transferrin. Whereas, of iron from a blood meal retained in body of the female, approximately 97% is from heme and <1% is from transferrin. Evaluation of iron-binding proteins in hemolymph and egg following intake of (59)Fe-transferrin revealed that ferritin is iron loaded in these animals, and indicate that this protein plays a critical role in meal iron transport and iron storage in eggs in A. aegypti.
Palavras-Chave: Blood meal; Heme iron; Transferrin iron; Ferritin; Iron transport; Egg iron reserve
Imprenta: Journal of Insect Physiology,v. 53, n. 11, p. 1169-1178
Identificador do objeto digital: https://doi.org/10.1016/j.jinsphys.2007.06.009
Descritores: Aedes aegypti - Cell ; Aedes aegypti - Proteins
Data de publicação: 2007
