TY - JOUR
T1 - Distribution of silicon/e in tissues of mice of different fibrinogen genotypes following intraperitoneal administration of emulsified poly(dimethysiloxane)
AU - Whitlock, Patrick W.
AU - DeAnglis, Ashley P.
AU - Ackley, Kathryn L.
AU - Clarson, Stephen J.
AU - Retzinger, Gregory S.
N1 - Funding Information:
This work was initiated by a Biomedical Engineering Seed Grant to G.S.R. and S.J.C. from the University of Cincinnati and completed by a grant to G.S.R. from the Komen Foundation for Breast Cancer Research. P.W.W. thanks the College of Engineering at the University of Cincinnati for a teaching assistantship and a graduate fellowship. The authors thank Dr. Joseph Caruso for the use of the ICP-AES instrument in his laboratory at the University of Cincinnati. G.S.R. thanks Ruth Mary Retzinger for inspiration.
PY - 2002
Y1 - 2002
N2 - Following injection into the abdominal cavity of a C57BL/6 mouse, droplets of emulsified PDMS visible by light microscopy (diameter ≥1 μm) disseminate to multiple organs of the animal. Because fibrinogen may facilitate dissemination, we compared histologically the accumulation of PDMS droplets in lymph nodes, lungs, spleen, liver, and left kidney of Fib +/+, Fib +/-, and Fib -/- mice of C57BL/6 background 35 and 75 days after intraperitoneal injection of an emulsion of the polymer. We also used ICP-AES to assess the accumulation of silicon in the lymph nodes, livers, and spleens of the animals. The emulsion droplets ranged in diameter from ∼0.04 to ∼80 μm. PDMS droplets visible by light microscopy were in all organs of both Fib +/+ mice and Fib +/- mice. In those animals, droplets were invariably either within or adjacent to inflammatory cells, predominantly macrophages. In contrast, PDMS droplets were visible in none of the organs of Fib -/- mice. Despite the absence of visible droplets in them, the lymph nodes, livers, and spleens of Fib -/- mice, like the corresponding organs of Fib +/+ and Fib +/- mice, contained measurable silicon after 35 and 75 days. The amount of silicon, however, was always greater in the organs of Fib +/+ and Fib +/- mice than in the organs of Fib -/- mice. We attribute the presence of silicon in organs that had no histologic evidence of droplets to diffusion of the very smallest droplets/soluble species of PDMS from the abdominal cavity. Taken together, our data and observations implicate a role for fibrinogen in the dissemination of larger PDMS droplets in vivo. We propose this role involves recognition of droplet-bound fibrinogen by macrophages and, perhaps, other inflammatory cells, and the subsequent fibrinogen-facilitated ingestion and/or extracellular movement of the droplets by those cells.
AB - Following injection into the abdominal cavity of a C57BL/6 mouse, droplets of emulsified PDMS visible by light microscopy (diameter ≥1 μm) disseminate to multiple organs of the animal. Because fibrinogen may facilitate dissemination, we compared histologically the accumulation of PDMS droplets in lymph nodes, lungs, spleen, liver, and left kidney of Fib +/+, Fib +/-, and Fib -/- mice of C57BL/6 background 35 and 75 days after intraperitoneal injection of an emulsion of the polymer. We also used ICP-AES to assess the accumulation of silicon in the lymph nodes, livers, and spleens of the animals. The emulsion droplets ranged in diameter from ∼0.04 to ∼80 μm. PDMS droplets visible by light microscopy were in all organs of both Fib +/+ mice and Fib +/- mice. In those animals, droplets were invariably either within or adjacent to inflammatory cells, predominantly macrophages. In contrast, PDMS droplets were visible in none of the organs of Fib -/- mice. Despite the absence of visible droplets in them, the lymph nodes, livers, and spleens of Fib -/- mice, like the corresponding organs of Fib +/+ and Fib +/- mice, contained measurable silicon after 35 and 75 days. The amount of silicon, however, was always greater in the organs of Fib +/+ and Fib +/- mice than in the organs of Fib -/- mice. We attribute the presence of silicon in organs that had no histologic evidence of droplets to diffusion of the very smallest droplets/soluble species of PDMS from the abdominal cavity. Taken together, our data and observations implicate a role for fibrinogen in the dissemination of larger PDMS droplets in vivo. We propose this role involves recognition of droplet-bound fibrinogen by macrophages and, perhaps, other inflammatory cells, and the subsequent fibrinogen-facilitated ingestion and/or extracellular movement of the droplets by those cells.
KW - Cell migration
KW - Fibrinogen
KW - Granuloma
KW - Kidney
KW - Liver
KW - Lung
KW - Lymph node
KW - Macrophages
KW - Metastasis
KW - Phagocytosis
KW - Poly(dimethylsiloxane)
KW - Spleen
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U2 - 10.1006/exmp.2002.2422
DO - 10.1006/exmp.2002.2422
M3 - Article
C2 - 11890725
AN - SCOPUS:0036348907
VL - 72
SP - 161
EP - 171
JO - Experimental and Molecular Pathology
JF - Experimental and Molecular Pathology
SN - 0014-4800
IS - 2
ER -