Effect of bilirubin in ischemia/reperfusion injury on rat small intestine.
OBJECTIVE
The aim of this study was to determine the effects of bilirubin in experimental small intestinal ischemia/reperfusion (I/R) injury in rats.


METHODS
Thirty rats were divided into 5 groups (n = 6). In group S, saline and in group B, bilirubin, 20 mg/kg were infused via the jugular vein without an additional procedure. In groups S-IR, saline, B(1)-IR and B(2)-IR, 10 and 20 mg/kg/h of bilirubin were infused for 2 hours, respectively. In these groups, an I/R procedure was done after infusions by occluding the superior mesenteric artery for 45 minutes followed by 1 hour of reperfusion. After reperfusion, the small intestines were resected for histopathologic and malondialdehyde (MDA) assessments. Mucosal lesions were scored between 0 and 5. Malondialdehyde levels and histopathologic grades were analyzed statistically.


RESULTS
Mucosal injury was severe in S-IR (grade 4 to 5), mild in B(1)-IR (grade 0 to 3) and none in B(2)-IR group (grade 0). Grades of group S-IR were higher than those of B(1)-IR and B(2)-IR statistically (P <.05). Tissue MDA levels of the S-IR group were significantly higher than those of B(1)-IR and B(2)-IR groups (U = 36, P <.05). Bilirubin levels correlated inversely with MDA levels (r = -0.94).


CONCLUSIONS
Bilirubin effectively prevents intestinal I/R injury in rat. This observation is consistent with the hypotheses regarding bilirubin as an antioxidant, having a role in the body defense. J Pediatr Surg 36:1764-1767.
Ceran
C
C
Pediatric Surgery Department of Gazi Univercity Medical School, Ankara, Turkey.
Sönmez
K
K
Türkyllmaz
Z
Z
Demirogullarl
B
B
Dursun
A
A
Düzgün
E
E
Başaklar
A C
AC
Kale
N
N
D000818:Animals; D000975:Antioxidants / Q000494:pharmacology / Q000627:therapeutic use; D001663:Bilirubin / Q000008:administration & dosage / Q000494:pharmacology* / Q000627:therapeutic use; D004195:Disease Models, Animal; D007262:Infusions, Intravenous; D007413:Intestinal Mucosa / Q000098:blood supply / Q000187:drug effects / Q000473:pathology; D007421:Intestine, Small / Q000098:blood supply* / Q000187:drug effects / Q000473:pathology; D008297:Male; D051381:Rats; D017208:Rats, Wistar; D015427:Reperfusion Injury / Q000188:drug therapy / Q000473:pathology* / Q000517:prevention & control
D000975:Antioxidants; D001663:Bilirubin