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Cell Tissue Res

Title:		Dufour gland of the digger wasp Liris niger: structure and developmental and biochemical aspects
Author(s):		Gnatzy W; Volknandt W; Schulz S;
Address:		"Zoologisches Institut, JW Goethe-Universitat, Siesmayerstr. 70, 60323, Frankfurt/M, Germany. gnatzy@zoology.uni-frankfurt.de"
Journal Title:		Cell Tissue Res
Year:		2004
Volume:		20031104
Issue:		1
Page Number:		125 - 138
DOI:		10.1007/s00441-003-0813-2
ISSN/ISBN:		0302-766X (Print) 0302-766X (Linking)
Abstract:		"The tubiform Dufour gland in the digger wasp species Liris niger is about 1.0 mm long ( 0.15 mm). An alternating arrangement of longitudinal and circumferential bundles of striated muscle fibers surrounds the gland. The Dufour gland, together with the venom gland, enters the sting base and terminates in the sting. The glandular epithelium is monolayered. Glands about 3 day after imaginal ecdysis have an empty lumen but a thick lining epithelium. The gland cells are characterized by a well-developed vesicular smooth endoplasmic reticulum, sparse rough ER and numerous free ribosomes. They also exhibit several electron-lucent vesicles and autophagic vacuoles. Secretion of electron-dense material via the gland cuticle into the gland lumen is apparent. Glands more than 20 days after imaginal ecdysis display a large lumen and a thin epithelium. The cells show signs of degeneration with numerous cytolytic inclusions. Dufour gland liquid contains numerous polypeptides of molecular weights ranging from 14 to about 200 kDa. In addition the secretion consists predominantly of straight-chain hydrocarbons, accompanied by small amounts of esters. The major hydrocarbons are pentadecane and ( Z)-8-heptadecene. Dufour gland secretion may have several functions: (1). the polypeptides might be involved in the gluing process of the eggs, while (2). the hydrocarbon oils may function as lubricants for the lancets and (3). might soften the secretion, thus allowing easier application of the glue. The lipophilic volatile material (4). might also be involved in pheromonal signaling"
Keywords:		"Alkanes/chemistry Animals Exocrine Glands/*chemistry/growth & development/*ultrastructure Hydrocarbons/chemistry Microscopy, Electron, Scanning Proteins/chemistry Secretory Vesicles/*chemistry/*ultrastructure Wasps/*anatomy & histology/chemistry/growth &;"
Notes:		"MedlineGnatzy, Werner Volknandt, Walter Schulz, Stefan eng Germany 2003/11/05 Cell Tissue Res. 2004 Jan; 315(1):125-38. doi: 10.1007/s00441-003-0813-2. Epub 2003 Nov 4"