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P Dustin

Publications and source records attributed to P Dustin.

At least 37 records · Page 2Linked to original sources
PubMed1977

The cellular lesions of Farber's disease and their experimental reproduction in tissue culture.

In a case of Farber's disease, lysosomal inclusions were shown to contain lamellar, rectilinear, or curvilinear material. In tissue culture, when fibroblasts from the patient were overloaded with ceramides containing nonhydroxylated fatty acids a lysosomal accumulation of small curvilinear structures identical with those observed at autopsy were seen. These inclusions persisted for several weeks after the cells were replaced in a normal culture medium. Normal fibroblasts overloaded in the same experimental conditions showed identical, although less numerous, lysosomal inclusions, which disappeared rapidly in a ceramide-free culture medium. No inclusions were found after overloading normal or pathologic fibroblasts with ceramides containing hydroxylated fatty acids.

Ceramides↗
PubMed1975

Studies on the transport of secretory granules in the magnocellular hypothalamic neurons of the rat. II. Action of vincristine on axonal flow and neurotubules in the paraventricular and supraoptic nuclei.

Intrathecal administration of 20 mug of vincristine sulphate in the rat induced in vivo the formation of paracrystalline inclusions mainly in axonal processes. This is associated with an impairment in the migration of neurosecretory granules as shown by their accumulation in the perikarya of the magnocellular neurons. The granules are intermixed with numerous dense bodies of various shape, sometimes with a fibrillar content, and probably of lysosomal origin. In addition to the impairment of the flow of neurosecretory granules, there is also a striking accumulation of mitochondria and synaptic vesicles, and an apparent proliferation of the smooth endoplasmic reticulum. In the posterior lobe, the axonal endings contain a large number of neurosecretory granules, intermingled with bodies of varying shapes and electron density. Occasionally, a dense membrane surrounding a group of elementary granules is observed, reacting positively for acid phosphatase. This suggests an attempted crinophagia.

Animals↗
PubMed1975

Action of colchicine on axonal flow and pituicytes in the hypothalamopituitary system of the rat.

Changes in the hypothalamo-pituitary tract and the pituicytes of the rat were studied after intrathecal and intraperitoneal injections of colchicine. Radioautography with 35S-cysteine demonstrates that intrathecal colchicine prevents the migration of neurosecretory granules from the supraoptic and paraventricular nuclei to the posterior lobe of the pituitary. This results in accumulations of neurosecretory granules and in the formation in the axons of elongated structures resembling neurosecretory products, although they sometimes have a fibrillary content. Neurotubules appear to remain intact in these conditions. The stimulation of the posterior pituitary by dehydration, in particular after injection of the diuretic furosemide, leads to an increased activity of pituicytes. When colchicine is injected at the same time as furosemide, a considerable new formation of centrioles is observed in the pituicytes. These become associated with ciliary vesicles, and form numerous cilia of the 9 + 0 type. An increased number of centrioles is also seen in the endothelial cells of the posterior lobe of the pituitary. These apparently paradoxical results were briefly discussed in relation to the action of colchicine on neurotubules and axonal flow and to the limited data from the literature indicating a stimulation of cilia formation under the action of colchicine and other drugs.

Animals↗