title: Effects of human serum and apo-Transferrin on Staphylococcus epidermidis RP62A biofilm formation.
abstract: Biofilm-associated Staphylococcus epidermidis infections present clinically important features due to their high levels of resistance to traditional antibiotics. As a part of human innate immune system, serum shows different degrees of protection against systemic S. epidermidis infection. We investigated the ability of human serum as well as serum component to inhibit the formation of, and eradication of mature S. epidermidis biofilms. In addition, the synergistic effect of vancomycin combined with apo-Transferrin was checked. Human serum exhibited significant antibiofilm activities against S. epidermidis at the concentration without affecting planktonic cell growth. However, there was no effect of human serum on established biofilms. By component separation, we observed that antibiofilm effect of serum components mainly due to the proteins could be damaged by heat inactivation (e.g., complement) or heat-stable proteins ≥100 kDa. In addition, serum apo-Transferrin showed modest antibiofilm effect, but without influence on S. epidermidis initial adhesion. And there was a synergistic antibiofilm interaction between vancomycin and apo-Transferrin against S. epidermidis. Our results indicate that serum or its components (heat-inactivated components or heat-stable proteins ≥100 kDa) could inhibits S. epidermidis biofilm formation. Besides, apo-Transferrin could partially reduce the biofilm formation at the concentration that does not inhibit planktonic cell growth.
authors.affiliation: Department of Medicine Clinical Laboratory, The Third Xiangya Hospital of Central South University, Changsha, 410013, China.
authors.forename: Pengfei
authors.initials: P
authors.lastname: She
authors.affiliation: Department of Medicine Clinical Laboratory, The Third Xiangya Hospital of Central South University, Changsha, 410013, China.
authors.forename: Lihua
authors.initials: L
authors.lastname: Chen
authors.affiliation: Department of Medicine Clinical Laboratory, The Third Xiangya Hospital of Central South University, Changsha, 410013, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Qi
authors.affiliation: Department of Medicine Clinical Laboratory, The Third Xiangya Hospital of Central South University, Changsha, 410013, China.
authors.forename: Huan
authors.initials: H
authors.lastname: Xu
authors.affiliation: Department of Medicine Clinical Laboratory, The Third Xiangya Hospital of Central South University, Changsha, 410013, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Xiangya School of Medicine, Central South University, Changsha, 410013, China.
authors.forename: Yangxia
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Medicine Clinical Laboratory, The Third Xiangya Hospital of Central South University, Changsha, 410013, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Luo
authors.affiliation: Department of Medicine Clinical Laboratory, The Third Xiangya Hospital of Central South University, Changsha, 410013, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Wu
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001422:Bacterial Adhesion / Q000187:drug effects; D018441:Biofilms / Q000187:drug effects / Q000254:growth & development*; D004357:Drug Synergism; D006801:Humans; D007106:Immune Sera / Q000494:pharmacology*; D008826:Microbial Sensitivity Tests; D013203:Staphylococcal Infections / Q000188:drug therapy* / Q000382:microbiology; D013212:Staphylococcus epidermidis / Q000254:growth & development*; D014168:Transferrin / Q000494:pharmacology*; D014640:Vancomycin / Q000494:pharmacology*
chemical_list: D000900:Anti-Bacterial Agents; D007106:Immune Sera; D014168:Transferrin; D014640:Vancomycin
keywords: 
  Staphylococcus epidermidis
  ; 
  XTT.
  ; Apo-Transferrin; biofilm; crystal violet; serum