Phagocytosis of latex beads and bacteria by hemocytes of the triatomine bug Rhodnius prolixus (Hemiptera: Reduvidae)

Borges, Andrezza Raposo; Santos, Patrícia Nazaré Ferreira dos; Furtado, André Freire; Figueiredo, Regina Célia Bressan Queiroz de

doi:10.1016/j.micron.2007.01.007

Cited by 38 publications

(25 citation statements)

References 26 publications

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“…Immune processes such as phagocytosis, melanization and lysis occur both in circulation and at sessile locations (Borges et al, 2008; Hillyer et al, 2003a, b; King and Hillyer, 2013; Kwon et al, 2014a), and in response to injury, circulating hemocytes adhere to wounds and initiate a healing response that usually involves melanization (Babcock et al, 2008; Krautz et al, 2014; Lai et al, 2001; Rowley and Ratcliffe, 1978). The distribution of circulating and sessile hemocytes can dynamically change, including the attachment of circulating hemocytes to sessile tissues and the release of sessile hemocytes into circulation (Babcock et al, 2008; King and Hillyer, 2012, 2013; Markus et al, 2009; Sigle and Hillyer, 2016).…”

Section: Immune Responses and Hemolymph Circulationmentioning

confidence: 99%

Insect immunology and hematopoiesis

Hillyer

2016

Developmental & Comparative Immunology

411

345

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Insects combat infection by mounting powerful immune responses that are mediated by hemocytes, the fat body, the midgut, the salivary glands and other tissues. Foreign organisms that have entered the body of an insect are recognized by the immune system when pathogen-associated molecular patterns bind host-derived pattern recognition receptors. This, in turn, activates immune signaling pathways that amplify the immune response, induce the production of factors with antimicrobial activity, and activate effector pathways. Among the immune signaling pathways are the Toll, Imd, Jak/Stat, JNK, and insulin pathways. Activation of these and other pathways leads to pathogen killing via phagocytosis, melanization, cellular encapsulation, nodulation, lysis, RNAi-mediated virus destruction, autophagy and apoptosis. This review details these and other aspects of immunity in insects, and discusses how the immune and circulatory systems have co-adapted to combat infection, how hemocyte replication and differentiation takes place (hematopoiesis), how an infection prepares an insect for a subsequent infection (immune priming), how environmental factors such as temperature and the age of the insect impact the immune response, and how social immunity protects entire groups. Finally, this review highlights some underexplored areas in the field of insect immunobiology.

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Section: Immune Responses and Hemolymph Circulationmentioning

confidence: 99%

Insect immunology and hematopoiesis

Hillyer

2016

Developmental & Comparative Immunology

411

345

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“…They additionally act through various processes including phagocytosis, nodule formation, and encapsulation to entrap and clear pathogens from the hemolymph. Phagocytosis, the process by which cells engulf large particles from the environment, is essential for host defense against infectious microorganisms and for the clearance of apoptotic cells generated during development (Borges et al 2008). Nodulation is a complex multi-step process that occurs quickly after microbial infection.…”

Section: Introductionmentioning

confidence: 99%

Cellular Immune Reactions of the Sunn Pest,Eurygaster integriceps, to the Entomopathogenic Fungus,Beauveria bassianaand Its Secondary Metabolites

Zibaee

Bandani

Talaei-Hassanlouei

et al. 2011

Journal of Insect Science

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In this study, five morphological types of circulating hemocytes were recognized in the hemolymph of the adult sunn pest, Eurygaster integriceps Puton (Hemiptera: Scutelleridae), namely prohemocytes, plasmatocytes, granulocytes, adipohemocytes, and oenocytoids. The effects of the secondary metabolites of the entomopathogenic fungus Beauveria bassiana on cellular immune defenses of Eurygaster integriceps were investigated. The results showed that the fungal secondary metabolites inhibited phagocytic activity of E. integriceps hemocytes and hampered nodule formation. A reduction of phenoloxidase activity was also observed. The data suggest that B. bassiana produce secondary metabolites that disable several immune mechanisms allowing the fungus to overcome and then kill its host. This characteristic makes B. bassiana a promising model for biological control of insect pests such as E. integriceps.

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“…Insect defenses against external agents through two cellular and humoral pathways (Schmid 2005). Several studies indicated that entrance of an invader in insect hemocoel induced two pathways and led to phagocytosis, nodule formation, encapsulation, and synthesis of antimicrobial peptides (Beckage 2008; Borges et al 2008). Nappi and Christensen (2005) reported humoral responses including production of proPO ascade and antibacterial peptide induced after nodule formation for killing of exogenous agents.…”

Section: Discussionmentioning

confidence: 99%

Immunological Responses of Sesamia cretica to Ferula ovina Essential Oil

Sadeghi

Raeisi

Jamshidnia

2017

Journal of Insect Science

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The current research was performed aiming to investigate the effects of Ferula ovina essential oil on the fourth instar larval hemogram of Sesamia cretica. Four main sorts of circulating hemocytes, including prohemocytes, plasmatocytes, granulocytes (GRs), and oenocytoides, were identified in the fourth instar larvae. Treatment of the larvae with the concentration of 1000 ppm of the essential oil led to an enhancement of the total hemocyte and GR count followed by a dose-dependent decrease at the concentrations of 2500 and 7000 ppm. Plasmatocyte numbers declined in all the treatments with more significant effects at increased doses. The greatest numbers of GRs, plasmatocytes, and total hemocytes were found after 48 h of treatment. The highest phenol-oxidase activity was recorded 12 h after treatment at the concentration of 2500 ppm. The highest effect on nodule formation was exerted by the concentration of 7000 ppm 12 h after treatment. The results of the present study clearly indicated that the treatment of larvae by the essential oil of F. ovina decreased the numbers of total and differential hemocyte counts although phenol-oxidase activity and the number of nodules showed no decline in the treated larvae. These results demonstrated that Ferula ovina essential oil has a significant effect on the immune ability of the studied insect and can be useful and usable for future research to practical management of this pest.

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Phagocytosis of latex beads and bacteria by hemocytes of the triatomine bug Rhodnius prolixus (Hemiptera: Reduvidae)

Cited by 38 publications

References 26 publications

Insect immunology and hematopoiesis

Insect immunology and hematopoiesis

Cellular Immune Reactions of the Sunn Pest,Eurygaster integriceps, to the Entomopathogenic Fungus,Beauveria bassianaand Its Secondary Metabolites

Immunological Responses of Sesamia cretica to Ferula ovina Essential Oil

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