title: Novel threadlike structures (Bonghan ducts) inside lymphatic vessels of rabbits visualized with a Janus Green B staining method.
abstract: A staining method has been developed for in situ and in vivo observation of a threadlike tissue afloat inside the lymphatic vessels of rabbits without adherence to the vessel wall. The existence of this novel structure was not noticed previously because it is extremely difficult to detect it by microscopic inspection of lymphatic vessels. We have found a method that utilizes Janus Green B (JGB), which stained heavily the novel structure. The tissue was studied by confocal laser scanning microscopy (CLSM), light microscopy, and cryoscanning electron microscopy (cryo-SEM). The CLSM image obtained by acridine orange staining of the novel tissue revealed its characteristic nuclei distribution: rod-shaped nuclei of 10-20 microm length aligned in a broken-line/striped fashion. Hematoxylin and eosin staining revealed the threadlike structure passing through a lymphatic valve as histologically distinct from lymphatic vessels and valves. The cryo-SEM image showed the threadlike structure inside a collapsed lymphatic vessel. There were spherical globular structures observable inside sinuses in a rapidly frozen sample, which suggests liquid flowing through the longitudinal ductules in the threadlike structure. The specific staining of the JGB suggests that these threadlike structures inside lymphatic vessels have a high density of mitochondria in their cells and/or nerve-like properties, either of which may provide important clues to their physiological function.
authors.affiliation: Biomedical Physics Laboratory, School of Physics, Seoul National University, Seoul 151-747, South Korea.
authors.forename: Byung-Cheon
authors.initials: BC
authors.lastname: Lee
authors.forename: Jung Sun
authors.initials: JS
authors.lastname: Yoo
authors.forename: Ku Youn
authors.initials: KY
authors.lastname: Baik
authors.forename: Ki Woo
authors.initials: KW
authors.lastname: Kim
authors.forename: Kwang-Sup
authors.initials: KS
authors.lastname: Soh
mesh_terms: D000818:Animals; D001391:Azo Compounds; D005260:Female; D042601:Lymphatic Vessels / Q000033:anatomy & histology* / Q000648:ultrastructure; D018613:Microscopy, Confocal; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D011817:Rabbits / Q000033:anatomy & histology*; D013194:Staining and Labeling / Q000379:methods*
chemical_list: D001391:Azo Compounds; C005086:Janus Green B