Bilirubin toxicity in a neuroblastoma cell line N-115: II. Delayed effects and recovery.

Abstract:

:Clinical studies have suggested that the early stages of bilirubin encephalopathy are reversible. These phenomena are investigated at the cellular level using the neuroblastoma cell line N-115 as a model system. To determine whether the cell line N-115 can recover from bilirubin toxicity, and whether the cellular function remains intact after a short period of bilirubin exposure during which time no toxic effects are manifest, the cells are exposed to bilirubin at varying concentrations and varying bilirubin:albumin ratios for 1 and 2 h. The bilirubin is then washed out, and the cells are reincubated in fresh media with appropriate amounts of albumin. Mitochondrial function, [3H]thymidine uptake and L-[35S]methionine uptake are assessed at 2, 8, and 24 h of reincubation after the bilirubin washout. After the short-term exposure, the cells begin to demonstrate evidence of toxicity in all parameters measured 8-24 h after the bilirubin washout. After the 2-h exposure to bilirubin, the cells demonstrate significant toxicity within 2 h of the bilirubin washout. The degree of toxicity seems to depend on the bilirubin:albumin ratio and bilirubin concentration. In general, after bilirubin exposure of 1 h or longer, the N-115 cells develop evidence of toxicity which is progressive and irreversible.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Amit Y,Poznansky MJ,Schiff D

doi

10.1203/00006450-198904000-00012

subject

Has Abstract

pub_date

1989-04-01 00:00:00

pages

369-72

issue

4

eissn

0031-3998

issn

1530-0447

journal_volume

25

pub_type

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