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Local hyperthyroidism promotes pancreatic acinar cell proliferation during acute pancreatitis

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Maglagola, E, Chen, R, Bombardo, M, Saponara, E, Dentice, M, Salvatore, D, Reding, T, Myers, S ORCID: 0000-0003-4793-3820, Hills, AP ORCID: 0000-0002-7787-7201, Graf, R and Sonda, S ORCID: 0000-0001-8152-3425 2019 , 'Local hyperthyroidism promotes pancreatic acinar cell proliferation during acute pancreatitis' , Journal of Pathology , doi: 10.1002/path.5247.

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Abstract

Proliferation of pancreatic acinar cells is a critical process in the pathophysiology of pancreatic diseases, because limited or defective proliferation is associated with organ dysfunction and patient morbidity. In this context, elucidating the signalling pathways that trigger and sustain acinar proliferation is pivotal to develop therapeutic interventions promoting the regenerative process of the organ.In this study we used genetic and pharmacological approaches to manipulate both local and systemic levels of thyroid hormones to elucidate their role in acinar proliferation following caerulein‐mediated acute pancreatitis in mice. In addition, molecular mechanisms mediating the effects of thyroid hormones were identified by genetic and pharmacological inactivation of selected signalling pathways.In this study we demonstrated that levels of the thyroid hormone 3,3’,5‐triodo‐L‐thyronine (T3) transiently increased in the pancreas during acute pancreatitis. Moreover, by using genetic and pharmacological approaches to manipulate both local and systemic levels of thyroid hormones, we showed that T3 was required to promote proliferation of pancreatic acinar cells, without affecting the extent of tissue damage or inflammatory infiltration.Finally, upon genetic and pharmacological inactivation of selected signalling pathways, we demonstrated that T3 exerted its mitogenic effect on acinar cells via a tightly controlled action on different molecular effectors, including histone deacetylase, AKT, and TGFβ signalling.In conclusion, our data suggest that local availability of T3 in the pancreas is required to promote acinar cell proliferation and provide the rationale to exploit thyroid hormone signalling to enhance pancreatic regeneration.

Item Type: Article
Authors/Creators:Maglagola, E and Chen, R and Bombardo, M and Saponara, E and Dentice, M and Salvatore, D and Reding, T and Myers, S and Hills, AP and Graf, R and Sonda, S
Keywords: Pancreatitis, mouse models, organ regeneration
Journal or Publication Title: Journal of Pathology
Publisher: John Wiley & Sons Ltd
ISSN: 0022-3417
DOI / ID Number: 10.1002/path.5247
Copyright Information:

Copyright 2019 Pathological Society of Great Britain and Ireland

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