FORMATION OF SALIVARY SECRETION IN <i>RHYNCHOSCIARA AMERICANA  </i>

Bianchi, A.G. de; Terra, Walter R.; Lara, Francisco J.

doi:10.1083/jcb.58.2.470

The Journal of Cell Biology

1973

DOI: 10.1083/jcb.58.2.470

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FORMATION OF SALIVARY SECRETION IN RHYNCHOSCIARA AMERICANA

A.G. de Bianchi

Walter R. Terra

Francisco J. Lara

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1974

1987

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Cited by 16 publications

References 16 publications

(20 reference statements)

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Ultrastructure of the larval salivary glands of Megaselia scalaris Loew (Diptera, Phoridae)

Curtis¹,

Benner²,

Cowden³

1987

Journal of Morphology

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Each of the paired salivary glands of third instar larvae of the humpbacked fly Megaselia scalaris is a bag-like structure with a short neck region from which a single duct emerges. The two ducts form a common duct that empties into the ventral region of the pharynx near the mouthparts. The wall of the glands and ducts consists of a simple squamous epithelium that rests upon a connective tissue layer. Cells in the neck are less flattened than those found elsewhere. The basal surfaces of the cells are infolded most deeply in the neck and the least in the duct. The apical surfaces of the cells possess microvilli except in the duct where the apices of the cells are covered by a complex extracellular layer. This layer displays circularly arranged folds that accommodate a thread-like supportive structure resembling taenidial threads of tracheae. Elaborate junctional complexes are associated with the lateral surfaces of the cells. Elements of these complexes include a zonula adherens, a series of pleated septate desmosomes, and conventional desmosomes. The cytoplasm of the glandular cells is filled with RER and other organelles normally seen in cells that export proteins and mucosubstances. Secretory material found in the lumens of the glands reacts only moderately with the PAS procedure but more strongly with alcian blue and methods that demonstrate proteins. The nuclei of the glandular cells contain single large nucleoli and polytene chromosomes whose banding is rather indistinct. Treatment with EDTA produces detrimental effects on all of the foregoing ultrastructural features of the glands and ducts.

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Ultrastructure of the larval salivary glands of Megaselia scalaris Loew (Diptera, Phoridae)

Curtis¹,

Benner²,

Cowden³

1987

Journal of Morphology

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Synthesis and secretion of mucoprotein glue in the salivary gland ofDrosophila melanogaster

Жимулев

Kolesnikov

1975

Wilhelm Roux' Archiv

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The processes of involved in the accumulation and secretion of adhesive mucoprotein ("glue") in third instar larvae ofD. melanogaster are described. The RNA templates for glue protein seem to be synthesized within 72-85 hours after oviposition, because treatment of larvae at this age with actinomycin D inhibits the accumulation of the secretion. The secretory granules appear in the salivary gland cells of 90 hour larvae and are discharged into the gland lumen of 118 hour larvae.Secretion of mucoprotein material by salivary gland cells into the gland lumen depends on high ecdysone concentration. Mucoproteins are synthesized, but not discharged, by these cells in ecdysone-deficient homozygousl gl larvae as well as in normal larvae isolated from ecdysone by ligatures or transplantation of the salivary glands into adult abdomens. Ecdysterone injection into normal 100 hour larvae, 7 dayl gl larvae or into adult imaginal abdomens into which salivary glands have previously been stimulates mucoprotein secretion into the gland lumen.Determination of total protein content in the salivary gland by Lowry's method has shown that "glue" proteins make up 21-32% of the total protein content in the gland.The glands of thel tl mutant do not give a PAS-positive reaction, nor are the granules of the secretion observed under the phase contrast microscope.

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Protein synthesis in the salivary glands of Rhynchosciara americana

Winter

Bianchi

Terra

et al. 1980

Developmental Biology

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FORMATION OF SALIVARY SECRETION IN RHYNCHOSCIARA AMERICANA

Cited by 16 publications

References 16 publications

Ultrastructure of the larval salivary glands of Megaselia scalaris Loew (Diptera, Phoridae)

Ultrastructure of the larval salivary glands of Megaselia scalaris Loew (Diptera, Phoridae)

Synthesis and secretion of mucoprotein glue in the salivary gland ofDrosophila melanogaster

Protein synthesis in the salivary glands of Rhynchosciara americana

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