Abstract
Thiamine mono- and pyrophosphatase (TMPase, TPPase) activities were demonstrated in the rat small ganglion cell under high-voltage electron microscopy. From a series of micrographs of the same field tilted in increments, a trans tubular network (TTN) consisting of looping and anastomosing tubules was found; this network showed relatively higher intense TMPase activity, and exhibited connections with TMPase-positive vesicle-like bodies. TPPase activity was localized in the trans Golgi saccules, and the TPPase-positive transmost saccule had a structural resemblance to the TTN. These results indicate that the TTN plays an important role in thiamine metabolism.
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