Histological description of the midgut and the pyloric valve of Tropidacris collaris (Stoll, 1813) (Orthopetera: Romaleidae)

Wanderley‐Teixeira, Valéria; Teixeira, Álvaro A.C.; Cunha, Franklin Magliano da; Costa, M. K. C. M.; Veiga, Antônio F.S.L.; Oliveira, José Vargas de

doi:10.1590/s1519-69842006000600011

Cited by 20 publications

(14 citation statements)

References 6 publications

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“…Differences in the regional ultrastructure of principal cells were observed along the midgut of G . gratiosa , a phenomenon also observed in other insects [12, 19, 20]. Regional differences in the principal cells of G .…”

Section: Discussionsupporting

confidence: 61%

Morphology and fine organization of the midgut of Gampsocleis gratiosa (Orthoptera: Tettigoniidae)

Zhang

Yang

et al. 2018

PLoS ONE

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The morphology and ultrastructure of the midgut of Gampsocleis gratiosa (Orthoptera: Tettigoniidae) was examined by light and electron microscopy. The midgut consists of two bulbous gastric caeca and a tubular ventriculus. The general organization of the gastric caeca is similar to that of the ventriculus. They are composed of a peritrophic membrane, an epithelium, a basal lamina and muscle layer from the inside to outside. Three types of cells were identified: regenerative, principal, and endocrine. Regenerative cells occur in groups (called nidi) at the base of principal cells. Principal cells grow from regenerative cells. Rare endocrine cells are scattered throughout the epithelium. Principal cells exhibit intense secretory activity, and regional differences in their ultrastructure were observed along the entire midgut. The microvilli are longer than those in any other region in the posterior region of the midgut. Lysosomes, multivesicular bodies (MVBs), autophagosomes, abundant Golgi apparatuses and lipid droplets primarily occur in the gastric caeca. Three pathways of secretion (merocrine, apocrine and holocrine) occur within the midgut epithelium, and a distinctive type of apocrine bleb was found in the gastric caeca. Therefore, these gastric caeca may be evolving toward a special type of gland.

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Section: Discussionsupporting

confidence: 61%

Morphology and fine organization of the midgut of Gampsocleis gratiosa (Orthoptera: Tettigoniidae)

Zhang

Yang

et al. 2018

PLoS ONE

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“…As células regenerativas são indiferenciadas e responsáveis pela renovação do epitélio do intestino médio, substituindo as células que se desgastam e se perdem durante o processo de digestão, além de possibilitar o crescimento do canal alimentar a cada ecdise. São encontradas na base do intestino médio, isoladamente ou em grupos formando ninhos, não havendo diferenças em sua abundância ao longo do mesêntero (Pinheiro et al 2003, Wanderley-Teixeira et al 2006, Martins et al 2006.…”

Section: Discussionunclassified

Morfologia do canal alimentar de lagartas de Spodoptera frugiperda (J E Smith) (Lepidoptera: Noctuidae) alimentadas com folhas tratadas com nim

Correia¹,

Wanderley‐Teixeira²,

Teixeira³

et al. 2009

Neotrop. entomol.

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“…Images were acquired with the Zeiss LSM 800 confocal microscope. For light microscopy ovaries were fixed in formaldehyde 4%, washed with Millonig’s buffer, dehydrated in graded series of ethanol (70%, 96%, 100%) and xylene (100%) and embedded in paraffin [54]. 5 μm thick sections were cut in a rotary microtome (Leica) and stained using standard hematoxylin-eosin procedure, mounted and photographed using an A1 ZEISS microscope.…”

Section: Methodsmentioning

confidence: 99%

Bicaudal Cis required for the function of the follicular epithelium during oogenesis inRhodnius prolixus

Pascual

Vilardo²,

Taibo³

et al. 2020

Preprint

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11The morphology and physiology of the oogenesis have been well studied in 12 the vector of Chagas disease Rhodnius prolixus. However, the molecular 13 interactions that regulate the process of egg formation, key for the reproductive 14 cycle of the vector, is still largely unknown. In order to understand the molecular 15 and cellular basis of the oogenesis we examined the function of the gene 16 Bicaudal C (BicC) during oogenesis and early development of R. prolixus. We 17 show that R. prolixus BicC (Rp-BicC) gene is expressed in the germarium, with 18 cytoplasmic distribution, as well as in the follicular epithelium of the developing 19 oocytes. RNAi silencing of Rp-BicC resulted in sterile females that lay few, small, 20 non-viable eggs. The ovaries are reduced in size and show a disarray of the 21 follicular epithelium. This indicates that Rp-BicC has a central role in the 22 regulation of oogenesis. Although the follicular cells are able to form the chorion, 23 the uptake of vitelline by the oocytes is compromised. We show evidence that the 24 polarity of the follicular epithelium and the endocytic pathway, which is crucial for 25 the proper yolk deposition, are affected. This study provides insights into the 26 molecular mechanisms underlying oocyte development and show that Rp-BicC 27 is important for de developenta of the egg and, therefore, a key player in the 28 reproduction of this Chagas disease vector. 29 30 Author summary 31 The oogenesis is the process of egg formation. It is essential to guarantee 32 transgenerational inheritance. It implies the differentiation of the gamete (oocyte) 33 from a niche of stem cells in the germ line, the accumulation of yolk, and the 34 formation of the chorion. These events are entangled in a regulated manner by 35 the concerted communication between the different cell types that form the ovary. 36 It is regulated by endogenous gene networks and linked to the physiological state 37 of the insect by hormonal clues. This timely orchestrated process represents the 38 interaction of gene networks. The genetic regulation behind the oogenesis is 39 largely unknown in Rhodnius prolixus. Here we identified a gene required for egg 40 formation that interferes the uptake of the yolk by affecting the functional integrity 41 of the follicular epithelium. Our results are of interest for a better understanding 42 of a complex process essential for the survival of vector populations and provide 43 knowledge to envisage and design new strategies for vector control. 44 45 46 Introduction 47 Rhodnius prolixus, is a hematophagous insect and, like other triatomines, is 48 the vector of Trypanosoma cruzi, the agent of Chagas disease [1,2]. Chagas 49 disease is a life-threatening disease affecting millions of people worldwide [3]. As 50 vaccine are unavailable and disease treatment is unsafe, vector control is still the 51 most useful method to control the illness. In this context, as oogenesis is crucial 52 for embryo viability and population dynamics, molecular investigation on this 53...

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Histological description of the midgut and the pyloric valve of Tropidacris collaris (Stoll, 1813) (Orthopetera: Romaleidae)

Cited by 20 publications

References 6 publications

Morphology and fine organization of the midgut of Gampsocleis gratiosa (Orthoptera: Tettigoniidae)

Morphology and fine organization of the midgut of Gampsocleis gratiosa (Orthoptera: Tettigoniidae)

Morfologia do canal alimentar de lagartas de Spodoptera frugiperda (J E Smith) (Lepidoptera: Noctuidae) alimentadas com folhas tratadas com nim

Bicaudal Cis required for the function of the follicular epithelium during oogenesis inRhodnius prolixus

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