The rectum of Oxaea flavescens (Andrenidae) has a specialized structure among bees

Serrão, José Éduardo; Marques-Silva, Solange; Martins, Gustavo Ferreira

doi:10.1016/j.micron.2003.11.013

Cited by 11 publications

(1 citation statement)

References 24 publications

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“…Septate junctions play an important role in maintaining the mechanical and physiological integrity of the epithelium 41,43,44 . In addition, septate junctions are important permeability barriers that control the transit of molecules through invertebrate epithelia 45–48 . Some chemical species such as lanthanum ions (La 3+ ), which have high charge density and occur in a hydrated state, can cross septate junctions 43,49,50 ; however, the passage of vitellogenin, which is a large protein with a molecular mass of 200–700 kDa 14,51 , seems unlikely, as septate junctions in different epithelia of insects are effective barriers to some ions and molecules larger than 7 kDa 49,52–54 .…”

Section: Discussionmentioning

confidence: 99%

Evidence for a transcellular route for vitellogenin transport in the telotrophic ovary of Podisus nigrispinus (Hemiptera: Pentatomidae)

Assis

Dohanik

Oliveira

et al. 2019

Sci Rep

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Vitellogenin is the main yolk precursor protein in insect oocytes. It is synthesized in the fat body and released into the hemolymph. To reach the oocyte surface, vitellogenin must cross a single layer of follicular epithelium cells. The transport of vitellogenin across the follicular epithelium has been suggested to occur through the enlarged intercellular spaces (patency) by a paracellular route or by endocytosis by follicular cells and release onto oocyte surface in a transcelluar route. In this study, we investigated whether vitellogenin transport in the meroistic telotrophic ovary of Podisus nigrispinus (Hemiptera) occurs via a paracellular or transcellular route. Light and transmission electron microscopies showed that short cell–cell contacts with well-developed occluding septate junctions were present in follicular cells with patency. Immunofluorescence microscopy revealed the presence of vitellogenin receptors in the plasma membrane and of vitellogenin in the cytoplasm of follicular cells. Data suggest that cell–cell contacts serve as a barrier to large vitellogenin molecules and that this protein is transported via a transcellular route of receptor-mediated endocytosis.

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Section: Discussionmentioning

confidence: 99%

Evidence for a transcellular route for vitellogenin transport in the telotrophic ovary of Podisus nigrispinus (Hemiptera: Pentatomidae)

Assis

Dohanik

Oliveira

et al. 2019

Sci Rep

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Postembryonic Development of Rectal Pads in Bees (Hymenoptera, Apidae)

Santos

Neves

Zanúncio

et al. 2009

The Anatomical Record

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The morphology and development of the digestive tract of insects has been extensively studied, but little attention has been given to the development of the rectal pads. These organs are responsible for absorption of water and salts. In insects where they occur, there are usually six ovoid rectal pads located in the medial-anterior portion of the rectum. The rectal pad has three types of cells: principal, basal, and junctional. The arrangement of these three cell types delimits an intrapapillary lumen. The aim of the current study is to describe the development of the rectal pads during postembryonic development of Melipona quadrifasciata anthidioides and Melipona scutellaris. Specimens were analyzed at the following developmental stages: white-, pink-, brown-, and black-eyed pupae, and adult workers. The development of the rectal pad begins as a thickening of the epithelium in white-eyed pupae at 54 hr. At this stage, there is neither a basal cell layer nor intrapapillary lumen. The basal layers begin to form in the pink-eyed pupa and are completely formed at the end of the development of the brown-eyed pupa. In the brown-eyed pupal stage, the intrapapillary lumen is formed and the junctional cells are positioned and completely differentiated. Necrotic and apoptotic cell death were detected along with cell proliferation in the whole rectum during pupal development, suggesting that the development of the rectal pads involves cell proliferation, death, and differentiation. The rectal pads originate only from the ectoderm. Anat Rec, 292:1602Rec, 292: -1611Rec, 292: , 2009. V V C 2009 Wiley-Liss, Inc.

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Changes in follicular cells architecture during vitellogenin transport in the ovary of social Hymenoptera

et al. 2015

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Vitellogenins are the major yolk proteins, synthesized in the fat body, released into the hemolymph and captured by the developing oocytes, but the mechanisms by which these proteins cross the follicular cell layer are still poorly understood. This study describes the actin distribution in follicular cells during vitellogenin transport to the oocyte in social Hymenoptera represented by bees Apis mellifera and Melipona quadrifasciata, the wasp Mischocyttarus cassununga and the ant Pachycondyla curvinodis. In oocytic chambers of vitellogenic follicles, vitellogenin was found within the follicular cells, perivitelline space and oocyte, indicating a transcellular route from the hemolymph to the perivitelline space. The cortical actin cytoskeleton in follicular cells underwent reorganization during transport of vitellogenin across this epithelium suggesting that in the ovary of social hymenopterans, vitellogenin delivery to oocytes requires a dynamic cytoskeletal rearrangement of actin filaments in the follicular cells.

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The rectum of Oxaea flavescens (Andrenidae) has a specialized structure among bees

Cited by 11 publications

References 24 publications

Evidence for a transcellular route for vitellogenin transport in the telotrophic ovary of Podisus nigrispinus (Hemiptera: Pentatomidae)

Evidence for a transcellular route for vitellogenin transport in the telotrophic ovary of Podisus nigrispinus (Hemiptera: Pentatomidae)

Postembryonic Development of Rectal Pads in Bees (Hymenoptera, Apidae)

Changes in follicular cells architecture during vitellogenin transport in the ovary of social Hymenoptera

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