Haemopoiesis in Lepidoptera. I. The multiplication of circulating haemocytes

Abstract

Haemopoiesis in Lepidoptera is doubtless accomplished to a large extent by mitosis of the circulating haemocytes. but there are some anomalies with regard to certain classes. Granular haemocytes and spherule cells are the only classes that divide frequently enough to account alone for their continued increase in numbers. Prohaemocytes divide frequently, but their numbers do not increase markedly. There is little doubt that they differentiate exclusively to plasmatocytes, which rarely divide themselves but continue to increase in numbers during larval life. An increase in plasmatocyte size and numbers after the fourth instar, when the mitotic index of prohaemocytes is declining, suggests an alternative source as well. Oenocytoids never divide, and undoubtedly derive from a separate source.

Estudo morfológico e quantitativo dos hemócitos em larvas de Diatraea saccharalis (Fabricius) (Lepidoptera, Pyralidae)

“…GUPTA (1979) relatou que os PR seriam mais numerosos nos estágios iniciais de desenvolvimento larval, sendo este rato bastante aceito, para a maioria dos insetos. ARNOLD & HINKS (1976) , estudando larvas de ELLroa, mostraram uma frequência de 6 % para os PR, sendo este resultados contestado por KAAYA & RATCUFFE (1982), que acreditavam terem sido incluí-dos, neste valor, os chamados PLjovens , que são muitas vezes indistinguíveis dos PR.…”

Effect of bombyxin-II, an insulin-related peptide of insects, on Bombyx mori hemocyte division in single-cell culture

“…The total number of hemocytes differs at each stage of development or under specific stress conditions. Hemocytes are thought to be postembryonically supplied by hemopoiesis in the hemopoietic organs or by mitotic division of circulating hemocytes (Jones, 1970;Akai and Sato, 1971;Arnold and Hinks, 1976). Many earlier studies of Bombyx mori (e.g., Nittono, 1960) note that differential and total hemocyte counts fluctuate with the molting cycle, suggesting that hemopoiesis and the mitotic division of circulating hemocytes are under endocrine control.…”

Caracterização citológica dos hemócitos de Anticarsia gemmatalis (Lepidoptera, Noctuidae) em larvas resistentes ao vírus AgMNPV

“…À semelhança de ANDRADE et al (2003), outros autores (ARNOLD & HINKS, 1976;BARRACCO & MENEZES, 1985;BARDUCO et al, 1988;DRIF & BREHÉLIN, 1993;BOMBONATO & GREGÓRIO, 1995;EDWARDS, 2004) também citam os ES como o terceiro tipo celular mais frequente nos insetos por eles estudados.…”