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Hepatocellular ballooning in NASH.

Abstract：

BACKGROUND & AIMS:Hepatocellular ballooning is a key finding in nonalcoholic steatohepatitis (NASH). It is conventionally defined by hemotoxylin and eosin (H&E) staining showing enlarged cells with rarefied cytoplasm and recently by changes in the cytoskeleton. Fat droplets are emerging as important organelles in cell metabolism. To address a possible relation between fat droplets and ballooning, we studied fat staining, H&E, and keratin 18 staining in human NASH. METHODS:Sequential staining and high resolution imaging were used to study freshly prepared cryo-sections from 10 patients with histologically confirmed steatohepatitis using oil red O for fat droplet identification, H&E to identify ballooning, and anti-K18 to confirm cytoskeletal changes. High resolution images were captured at each stage using the Aperio Scanscope. To provide ultrastructural correlation, glutaraldehyde-fixed specimens were studied using transmission electron microscopy (TEM) with serial sectioning for localization of ballooned cells by light microscopy and TEM in identical specimens. RESULTS:Serial staining consistently demonstrated that hepatocellular ballooning is associated with fat droplet accumulation evident by oil red O positivity and depletion of cytoplasmic keratin 18 with K-18 positive Mallory-Denk bodies (MDB). TEM confirmed the association between osmium stained fat droplets, MDB formation, and cellular enlargement and suggested droplet-associated dilation of the endoplasmic reticulum. CONCLUSIONS:These results indicate a relationship between cellular ballooning, fat droplet accumulation, and cytoskeletal injury in NASH. We speculate that injury to multiple, organelles including fat droplets and endoplasmic reticulum, contribute to this characteristic finding.

journal_name

J Hepatol

journal_title

Journal of hepatology

authors

Caldwell S,Ikura Y,Dias D,Isomoto K,Yabu A,Moskaluk C,Pramoonjago P,Simmons W,Scruggs H,Rosenbaum N,Wilkinson T,Toms P,Argo CK,Al-Osaimi AM,Redick JA

doi

10.1016/j.jhep.2010.04.031

subject

Has Abstract

pub_date

2010-10-01 00:00:00

pages

719-23

issue

4

eissn

0168-8278

issn

1600-0641

pii

S0168-8278(10)00557-X

journal_volume

53

pub_type

杂志文章

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