A HISTOCHEMICAL STUDY OF THE SECRETIONS IN THE PRINCIPAL SALIVARY GLANDS OF THE LARGE MILKWEED BUG, ONCOPELTUS FASCIATUS (DALLAS)

1960 ◽  
Vol 38 (3) ◽  
pp. 449-454 ◽  
Author(s):  
E. H. Salkeld
Keyword(s):  
Salivary Gland ◽  
Salivary Glands ◽  
Histochemical Study ◽  
Lateral Lobe ◽  
Anterior Lobe ◽  
Oncopeltus Fasciatus ◽  
Posterior Lobe ◽  
Milkweed Bug ◽  
Digestive Function ◽  
Histochemical Tests

Each lobe of the trilobed principal salivary gland of the adult large milkweed bug, Oncopeltus fasciatus (Dallas), contains a chemically different secreted product. Histochemical tests suggest that the secretion of the anterior lobe is composed of muco- or glyco-protein and neutral mucopolysaccharide. The secretion of the lateral lobe is mainly lipoproteinaceous, while that of the posterior lobe appears to be a mucoprotein. It is suggested that the secretion of the anterior lobe may form the stylet sheath; the secretions of the posterior and lateral lobes are more likely to have a digestive function.

HISTOCHEMICAL STUDIES ON LOCALIZATION AND DISTRIBUTION OF ESTERASES IN THE SALIVARY GLANDS OF THE LARGE MILKWEED BUG, ONCOPELTUS FASCIATUS (DALL.) (HEMIPTERA: LYGAEIDAE)

1959 ◽  
Vol 37 (2) ◽  
pp. 113-115 ◽  
Author(s):  
E. H. Salkeld
Keyword(s):  
Epithelial Cells ◽  
Salivary Glands ◽  
Body Wall ◽  
Epidermal Cells ◽  
Oncopeltus Fasciatus ◽  
Nonspecific Esterase ◽  
Posterior Lobe ◽  
Milkweed Bug

The posterior lobe of the salivary glands of the large milkweed bug, Oncopeltus fasciatus (Dall.), was rich in a nonspecific esterase. An esterase was also localized in the epidermal cells of the tracheae and body wall and in the epithelial cells of the first part of the mid-gut. No true lipase was found in the salivary glands or in the head or thorax.

scholarly journals The Physiological Division of Labour in the Salivary Glands of Oncopeltus F Asciatus (Dall.) (Heteroptera: Lygaeidae)

1967 ◽  
Vol 20 (4) ◽  
pp. 785 ◽  
Author(s):  
PW Miles
Keyword(s):  
Salivary Glands ◽  
Polyphenol Oxidase ◽  
Lateral Lobe ◽  
Salivary Secretion ◽  
Division Of Labour ◽  
Anterior Lobe ◽  
Accessory Gland ◽  
Posterior Lobe ◽  
Sulphydryl Groups ◽  
Sheath Material

The physical and chemical characteristics of the contents of the different lobes of the salivary glands of O. fasciatu8 are compared with the characteristics of the two types of salivary secretion: namely the solid "stylet sheath" and the liquid "watery saliva". It is concluded that the anterior lobe contributes most of the sulphydryl groups that form the disulphide bonds in the sheath material, but that the lateral lobe provides most of the bulk of the sheath; that the posterior lobe contributes the digestive enzymes found in the watery saliva; that the accessory gland secretes water that can dilute the watery saliva; and that the accessory gland also provides the polyphenol oxidase that is sometimes found in the watery saliva and is always secreted along with the sheath material. Surgical isolation of the accessory gland gave no positive information on the function of the polyphenol oxidase.

scholarly journals Morphology and ultrastructure of salivary glands of male treehopper Tricentrus brunneus Funkhouser (Hemiptera: Membracoidea)

2019 ◽  
Vol 26 (4) ◽  
pp. 201-212
Author(s):  
Haiying Zhong ◽  
Yalin Zhang ◽  
Cong Wei
Keyword(s):  
Salivary Glands ◽  
Secretory Granules ◽  
Virus Transmission ◽  
Anterior Lobe ◽  
Accessory Gland ◽  
Posterior Lobe ◽  
Salivary Duct ◽  
Accessory Glands ◽  
Size Number ◽  
Gland Duct

The salivary glands of male treehopper Tricentrus brunneus Funkhouser comprise a pair of acinous principal glands each with an anterior lobe and a posterior lobe; a pair of elbow-shaped accessory glands. Every accessory gland connects with the principal gland via a thin accessory salivary duct. The anterior lobe contains three types of acini (I, II and III), whereas the posterior lobe possesses only one type of acinus (IV). Two efferent salivary ducts fuse into a common salivary duct. Different acinis cells are filled with secretory granules that are distinct in size, number, shape and electron-density, indicating a maturation process before secreted. Infoldings in different acini suggest dilution of substances before being secreted. The presence of microvilli in acinus IV and the accessory gland duct possibly indicates the undergoing maturation of secretions. Electron-dense fine granules existed in the accessory gland cells, possibly related to virus transmission.

ANATOMY, HISTOLOGY, AND SECRETIONS OF SALIVARY GLANDS OF THE LARGE MILKWEED BUG, ONCOPELTUS FASCIATUS (DALLAS) (HEMIPTERA: LYGAEIDAE)

1958 ◽  
Vol 36 (6) ◽  
pp. 961-968 ◽  
Author(s):  
Joan F. Bronskill ◽  
E. H. Salkeld ◽  
W. G. Friend
Keyword(s):  
Salivary Glands ◽  
Digestive Enzymes ◽  
Oncopeltus Fasciatus ◽  
Milkweed Bug ◽  
Accessory Glands

As in most Heteroptera, the salivary system of Oncopeltus fasciatus (Dallas) consists of a pair of trilobed principal glands and a pair of tubular accessory glands with associated ducts; the anatomy and histology are reported in detail. Tests for digestive enzymes demonstrated the presence of amylase, protease, invertase, and lipase. The various lobes of the salivary glands contain different digestive enzymes, a finding that is at variance with some published reports on allied Heteroptera.

scholarly journals Biochemical characterisation of the tissue degrading enzyme, collagenase, in the spined soldier bug, Podisus maculiventris (Hemiptera: Pentatomidae)

2014 ◽  
Vol 54 (2) ◽  
pp. 164-170 ◽  
Author(s):  
Mahboob Ghamari ◽  
Vahid Hosseininaveh ◽  
Ali Darvishzadeh ◽  
Khalil Talebi
Keyword(s):  
Salivary Gland ◽  
Salivary Glands ◽  
Ethylenediaminetetraacetic Acid ◽  
Significant Inhibition ◽  
Generalist Predator ◽  
Collagenolytic Activity ◽  
Posterior Lobe ◽  
Podisus Maculiventris ◽  
Collagenase Activity ◽  
Biochemical Characterisation

Abstract Podisus maculiventris (Say) is a generalist predator attacking many insect species from different orders. The bug injects saliva into its prey's body. The ingested hemolymph and liquefied internal tissues pass through the bug's alimentary tract. Collagenase working on peptide bonds of collagen and basement membrane proteins, leads to the disintegration of the prey's internal organs. As yet, there is an almost complete lack of knowledge on the collagenase activity in P. maculiventris. The collagenase activity of the salivary glands and midgut was optimum at pH 8.0 which was congruent with the optimal pH of the total proteolytic activity of the salivary glands. More collagenolytic activity was determined in the posterior lobe of the salivary glands and anterior midgut. Significant inhibition of collagenolytic activity by ethylenediaminetetraacetic acid (EDTA) revealed the enzyme is a metalloproteinase. The collagenase activity notably decreased when the bug went hungry. The salivary gland collagenase is a vital enzyme in extra-oral digestion and facilitates the action of other digestive enzymes. The midgut collagenase may be involved in the digestion of the ingested muscle fibers. The collagenase probably acts as an intoxicating agent in the saliva (venom) of P. maculiventris. Paralysing toxins are present in the salivary gland secretion.

scholarly journals Neurofibromin expression by normal salivary glands

2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Eloá Borges Luna ◽  
Pâmella Pinho Montovani ◽  
Rafaela Elvira Rozza-de-Menezes ◽  
Karin Soares Cunha
Keyword(s):  
Salivary Gland ◽  
Salivary Glands ◽  
Acinar Cells ◽  
Staining Intensity ◽  
Neurofibromatosis 1 ◽  
Tissue Type ◽  
Sublingual Gland ◽  
Minor Salivary Glands ◽  
Expression Levels ◽  
Ductal Cells

AbstractIntroductionNeurofibromin, a protein encoded by theNF1gene, is mutated in neurofibromatosis 1, one of the most common genetic diseases. Oral manifestations are common and a high prevalence of hyposalivation was recently described in individuals with neurofibromatosis 1. Although neurofibromin is ubiquitously expressed, its expression levels vary depending on the tissue type and developmental stage of the organism. The role of neurofibromin in the development, morphology, and physiology of salivary glands is unknown and a detailed expression of neurofibromin in human normal salivary glands has never been investigated.AimTo investigate the expression levels and distribution of neurofibromin in acinar and ductal cells of major and minor salivary glands of adult individuals without NF1.Material and methodTen samples of morphologically normal major and minor salivary glands (three samples of each gland: parotid, submandibular and minor salivary; and one sample of sublingual gland) from individuals without neurofibromatosis 1 were selected to assess neurofibromin expression through immunohistochemistry. Immunoquantification was performed by a digital method.ResultsNeurofibromin was expressed in the cytoplasm of both serous and mucous acinar cells, as well as in ducts from all the samples of salivary glands. Staining intensity varied from mild to strong depending on the type of salivary gland and region (acini or ducts). Ducts had higher neurofibromin expression than acinar cells (p = 0.003). There was no statistical association between the expression of neurofibromin and the type of the salivary gland, considering acini (p = 0.09) or ducts (p = 0.50) of the four salivary glands (parotid, submandibular, minor salivary, and sublingual gland). Similar results were obtained comparing the acini (p = 0.35) and ducts (p = 0.50) of minor and major salivary glands. Besides, there was no correlation between the expression of neurofibromin and age (p = 0.08), and sex (p = 0.79) of the individuals, considering simultaneously the neurofibromin levels of acini and duct (n = 34).ConclusionNeurofibromin is expressed in the cytoplasm of serous and mucous acinar cells, and ductal cells of salivary glands, suggesting that this protein is important for salivary gland function.

Studies on the pteridines in the milkweed bug, Oncopeltus fasciatus (Dallas)

1966 ◽  
Vol 12 (11) ◽  
pp. 1411-1421 ◽  
Author(s):  
Hugh S. Forrest ◽  
Michael Menaker ◽  
Jennifer Alexander
Keyword(s):  
Oncopeltus Fasciatus ◽  
Milkweed Bug

scholarly journals Effect of captivity on genetic variance for five traits in the large milkweed bug (Oncopeltus fasciatus)

Heredity ◽  
2004 ◽  
Vol 93 (1) ◽  
pp. 51-61 ◽  
Author(s):  
K M Rodríguez-Clark
Keyword(s):  
Genetic Variance ◽  
Oncopeltus Fasciatus ◽  
Milkweed Bug
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