Abstract
Unheated-normal rabbit and rat sera stimulate bone resorption in tissue culture. The magnitude of this effect is enhanced when the sera were incubated with an antigen-antibody precipitate. Sera heated prior to treatment with antigen-antibody precipitate had no effect on bone resorption. The stimulation of bone resorption by sera was associated with osteoclast formation. Our results are consistent with a heat labile factor in some sera which stimulates bone resorption. Whether this factor is a component of complement or not is not answered by our studies.
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