skip to main content
Idioma:

Uptake of yolk proteins in Rhodnius prolixus

Oliveira, Pedro L. ; Gondim, Katia C. ; Guedes, Damião M. ; Masuda, Hatisaburo

Journal of insect physiology, 1986, Vol.32 (10), p.859-866 [Periódico revisado por pares]

Amsterdam: Elsevier Ltd

Texto completo disponível

Citações Citado por
  • Título:
    Uptake of yolk proteins in Rhodnius prolixus
  • Autor: Oliveira, Pedro L. ; Gondim, Katia C. ; Guedes, Damião M. ; Masuda, Hatisaburo
  • Assuntos: Biochemistry. Physiology. Immunology ; Biological and medical sciences ; endocytosis ; Fundamental and applied biological sciences. Psychology ; Insecta ; Invertebrates ; Physiology. Development ; Reduviidae ; Rhodnius prolixus ; vitellogenesis ; vitellogenin ; Yolk protein
  • É parte de: Journal of insect physiology, 1986, Vol.32 (10), p.859-866
  • Notas: ObjectType-Article-2
    SourceType-Scholarly Journals-1
    ObjectType-Feature-1
    content type line 23
  • Descrição: The uptake of yolk protein in Rhodnius prolixus was studied in vivo and in vitro using a metabolically labelled [ 32P]yolk protein purified on a potassium bromide gradient. The [ 32P]vitellin is readily removed from haemolymph and specifically accumulates in the ovary. The ability of oöcytes to take up yolk protein at different stages of development increases with their size up to the time of chorion formation. This increase in uptake capacity of oöcytes correlates with the opening of intercellular space in the follicular epithelium. The rate of uptake is dependent on the external concentration of yolk protein and temperature, and can be saturated. Separate analysis of binding shows a similar dependence on yolk protein concentration. Soon after a meal, the vitellogenin concentration increases in the haemolymph until it reaches a steady-state concentration at which the rate of vitellogenin uptake matches the rate of vitellogenin synthesis. Most ovarian growth occurs while the concentration of vitellogenin in the haemolymph is at this steady-state level, which is in turn very close to its ovarian binding constant of 12 mg/ml determined in vitro. Thus it is suggested that the uptake system normally works undersaturated and below its maximal rate of uptake.
  • Editor: Amsterdam: Elsevier Ltd
  • Idioma: Inglês
Links
Voltar para lista de resultados

  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

Buscando em bases de dados remotas. Favor aguardar.