title: [Nutritional requirements for oral Treponema].
abstract: Oral Treponema is still difficult to cultivate in vitro because of lacking of our knowledge about what they require for growth. The aim of this study was to find what were the nutritional requirements for them. Treponema denticola, T. vincentii, and T. socranskii were cultivated in various broths to seek which fractions of tryptone and rabbit serum, or serum proteins were stimulatory. Treponemal growth was assessed by turbidity readings. It was obvious that a weakly negative-charged peptide isolated from tryptone with molecular weight of about 800 daltons was stimulatory. However, further characterization of this peptide was failed, since the yield of the final fractions was too low to be identified with the conventional methods. The results on rabbit serum fractionated by a liquid chromatograph showed that serum proteins with molecular weight of 150,000 daltons were also stimulatory for T. denticola. Among the commercially available serum proteins, human and bovine ceruloplasmin gave good results. They could substitute for rabbit serum in the growth of T. denticola and T. vincentii.
authors.forename: A
authors.initials: A
authors.lastname: Watanabe
authors.forename: M
authors.initials: M
authors.lastname: Suzuki
authors.forename: T
authors.initials: T
authors.lastname: Watanabe
mesh_terms: D000818:Animals; D001798:Blood Proteins / Q000378:metabolism; D002570:Ceruloplasmin; D011817:Rabbits; D014208:Treponema / Q000254:growth & development*
chemical_list: D001798:Blood Proteins; D002570:Ceruloplasmin