A device for adsorbing unbound, unconjugated bilirubin and its effects in vitro and in a hyperbilirubinemic newborn piglet.
OBJECTIVE
A novel blood purification material that we previously reported as a superantigen- and cytokine-adsorbing device (SCAD) was evaluated for its ability to adsorb unbound, unconjugated bilirubin (UUBil) in vitro and in vivo.


METHODS
In albumin-containing buffer, UUBil was dissolved and circulated through the SCAD column. Also, bilirubin was infused into low-body weight newborn piglets and hemoperfused for 3 h over SCAD columns.


RESULTS
In albumin-containing buffer, concentration of bilirubin decreased from 34 to 0.6 mg/dL within 5 h and the SCAD fiber turned brown, indicating that bilirubin was adsorbed onto the surface of the adsorbent and was not degraded during the circulation. Using the hyperbilirubinemia swine, clearances of total bilirubin (TBil), direct bilirubin (DBil), and indirect bilirubin (IdBil) were significantly higher (P<0.01) in the SCAD group compared with the control group. The clearances of TBil, DBil, and IdBil at 3 h after the initiation of the bilirubin infusion were 0.47, 0.53, and 0.45 mL/min, respectively, at a blood flow rate of 2.5 mL/min, and this result indicates that almost 20% of bilirubins were adsorbed to the SCAD column in a single passage.


CONCLUSIONS
These results provide initial evidence that SCAD treatment is effective in the removal of UUBil and can be performed safely in newborn animals.
Miwa
Keishi
K
New Frontiers Research Laboratories, Toray Industries Inc., Kanagawa, Japan. Keishi_Miwa@nts.toray.co.jp
Misumi
Kazuhiro
K
Shimada
Kaoru
K
Miyoshi
Noriaki
N
Inoue
Takehiro
T
Kawabe
Yoshihiro
Y
Moriyama
Kazuhiro
K
Ibara
Satoshi
S
Ikenoue
Tsuyomu
T
Sakamoto
Hiroshi
H
D000327:Adsorption; D000818:Animals; D000831:Animals, Newborn; D001663:Bilirubin / Q000097:blood / Q000502:physiology*; D004195:Disease Models, Animal; D006464:Hemoperfusion / Q000295:instrumentation* / Q000379:methods; D006932:Hyperbilirubinemia / Q000097:blood / Q000473:pathology / Q000628:therapy*; D066298:In Vitro Techniques; D007475:Ion Exchange Resins; D013552:Swine
D007475:Ion Exchange Resins; D001663:Bilirubin