Summary
The cytochemical localization of acid phosphatase and thiamine pyrophosphatase activity was studied by light and electron microscopy in prothoracic gland cells of the cockroach Leucophaea moderae. Nymphal and young adult animals were used.
Prominent sites of acid phosphatase activity included large membrane-bounded dense bodies or lysosomes, and certain cisternae of the Golgi apparatus. The results suggest a possible difference in the enzymatic activity toward glycerophosphate and aromatic phosphates as substrates.
Thiamine pyrophosphatase activity was localized in elements of the Golgi apparatus and endoplasmic reticulum, and in lysosome-like dense bodies. This latter activity was abolished by sodium fluoride treatment, whereas the phosphatase activity in the Golgi apparatus and endoplasmic reticulum is unaffected by such inhibition.
The cytochemical results confirm through direct evidence the suggestions of Scharrer (1964), that the large dense bodies present in the prothoracic gland cells are lysosomes, and that their activity may be related to stages in the life history of the glands. Furthermore, the lysosomes or their derivative structures may play an essential role in the autolysis of the prothoracic glands toward the end of their active period.
The enzymatic activity of the endoplasmic reticulum may indicate the involvement of this organelle in the metabolism of “steroid-like” precursor materials necessary for the synthesis of ecdysone.
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This study was supported by U.S.P.H.S. grants 5 T1-MH-6418 and NB-05219, and grant RO 1-AM-3984 to Dr. Berta Scharrer. I would like to express my appreciation to Dr. Scharrer for her encouragement and assistance during this study. I also wish to thank Mrs. Sarah Wurzelmann for her competent technical aid.
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Osinchak, J. Ultrastructural localization of some phosphatases in the prothoracic gland of the insect Leucophaea Maderae . Z. Zellforsch. 72, 236–248 (1966). https://doi.org/10.1007/BF00334277
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DOI: https://doi.org/10.1007/BF00334277