Sources of extracellular lysosomal enzymes released in organ-culture by developing and healing inflammatory lesions.
Developing and healing inflammatory lesions were topically produced in the skin of rabbits by sulfur mustard (SM). After the rabbits were sacrificed, the various lesions were removed and organ-cultured. The organ-culture fluids extracted the extracellular lysosomal enzymes (acid phosphatase, beta-glucuronidase, beta-galactosidase, and lysozyme), so that they could be measured biochemically along with lactic dehydrogenase (LDH), an enzyme marker for cell death. In tissue sections, the number and types of cells were counted, and their lysosomal enzyme content evaluated histochemically. The culture fluids from peak lesions contained much lower levels of all five enzymes than did culture fluids from healing lesions. When histological-histochemical-biochemical correlations were made, serum, macrophages (MN), and activated fibroblasts (but not tissue PMN) appeared to be major sources of extracellular lysosomal enzymes in peak lesions; and the dead PMN in the crusts and the activated fibroblasts in the tissues appeared to be major sources in healing lesions. The high lysosomal enzyme content of the crusts covering the lesions suggests that this passive barrier may also play an active role in promoting healing and in protecting against invasion by microorganisms.
Department of Environmental Health Sciences, School of Hygiene and Public Health, Johns Hopkins University, Baltimore, Maryland.
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A
Kajiki
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Higuchi
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Nakamura
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Liu
P J
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Pula
A M
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Dannenberg
D000818:Animals; D002470:Cell Survival; D003872:Dermatitis / Q000139:chemically induced / Q000201:enzymology* / Q000473:pathology; D005110:Extracellular Space / Q000201:enzymology*; D005347:Fibroblasts / Q000201:enzymology; D006651:Histocytochemistry; D008247:Lysosomes / Q000201:enzymology*; D008264:Macrophages / Q000201:enzymology; D009504:Neutrophils / Q000201:enzymology; D009924:Organ Culture Techniques; D011817:Rabbits; D014945:Wound Healing