Triiodothyronine stimulates hepatocyte proliferation in two models of impaired liver regeneration.

Abstract:

OBJECTIVES:Liver regeneration is attenuated in old age and is substantially slower after 90% than after 70% partial hepatectomy (PH). We have previously demonstrated that the proliferative response to a primary mitogen is intact in aged mice, indicating that impaired liver regeneration is not due to loss of proliferative capacity. Here, we have investigated whether mitogenic effects of triiodothyronine (T3) could reverse the impaired regeneration of ageing or 90% hepatectomy, in the rat. MATERIALS AND METHODS:T3 (20 microg/100 g body weight) was administered to 14-month-old rats subjected to 70% PH or to young rats subjected to 90% PH. Cell-proliferative capacity was determined by bromodeoxyuridine incorporation and microscopy and changes of cell cycle-related proteins were analysed by Western blot analysis. RESULTS:Treatment of old intact rats with T3 increased cyclin D(1) expression that was followed by an enhanced proliferative response, the labelling index (LI), being 7.8% versus 1.3% of controls. T3 given before 70% PH stimulated regenerative response (LI was 10.8% versus 2.28%), and expression of cyclin D(1) and proliferating cell nuclear antigen (PCNA) 24 h after PH. Pre-treatment with T3 also improved the regenerative response of the liver after 90% hepatectomy (LI was 27.9% versus 14.2%). CONCLUSIONS:These findings show in principle that mitogen-induced hyperplasia could be applied to human therapy in patients with reduced regenerative capacity or massive loss of hepatocytes.

journal_name

Cell Prolif

journal_title

Cell proliferation

authors

Columbano A,Simbula M,Pibiri M,Perra A,Deidda M,Locker J,Pisanu A,Uccheddu A,Ledda-Columbano GM

doi

10.1111/j.1365-2184.2008.00532.x

subject

Has Abstract

pub_date

2008-06-01 00:00:00

pages

521-31

issue

3

eissn

0960-7722

issn

1365-2184

pii

CPR532

journal_volume

41

pub_type

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