ISSN:
1432-0878
Schlagwort(e):
Pineal gland
;
Freeze-fracture
;
Cell junctions
;
Gap junction
;
Tight junction
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
,
Medizin
Notizen:
Summary The intercellular junctions between the pinealocytes of male rats were investigated by freeze-fracture and conventional electron microscopy. Our findings reveal that the intercellular contacts between pineal cells, formerly described as zonulae adhaerentes or zonulae occludentes, are in fact gap junctions which are difficult to characterize in thin sections due to their peculiar geometrical arrangement, which is in the form of “fenestrated” communicating zonules. The arrangement of these communicating zonules around rudimentary lumina of pineal clusters and rare transitions between tight and gap junctions may point to phylogenetic transformations of occluding into communicating zonules, corresponding with the change of the pineal gland from a sensory to a secretory organ. Alternatively, these tight-to-gap junctional transitions may reflect the periodic (circadian or seasonal) activity of the pineal gland.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00210346
Permalink
