Thyroid-stimulating hormone initiated proliferative signals converge in vivo on the mTOR kinase without activating AKT.

Abstract:

:Thyroid-stimulating hormone (TSH) has long been recognized as the major proliferative and functional stimulus for thyroid follicular cells. TSH receptor (TSHR) engagement stimulates the production of cyclic AMP and the subsequent activation of downstream effector molecules, including protein kinase A, S6K1, and Rap1, whereas the role of the RAS and phosphatidylinositol-3-kinase signaling cascades downstream of TSHR is still controversial. Despite the abundance of candidates, it is still unclear which of these pathways represent(s) the key mitogenic output of TSH-initiated signaling. We have used an in vivo model of goitrogenesis to dissect the contribution of these pathways to TSH-induced thyrocyte proliferation and thyroid hyperplasia. We show that the in vivo proliferative response to chronic TSHR stimulation relies heavily on the activation of the mTOR/S6K1 axis, and that mTOR inhibition during goitrogenic stimulation abrogates the hyperplastic but not the hypertrophic thyrocyte responses to TSH, thus functionally uncoupling these two processes. Strikingly, goitrogenesis was not associated with an increase in AKT phosphorylation levels, underlining the existence of an AKT-independent pathway leading to mTOR activation upon TSH stimulation.

journal_name

Cancer Res

journal_title

Cancer research

authors

Brewer C,Yeager N,Di Cristofano A

doi

10.1158/0008-5472.CAN-07-2471

subject

Has Abstract

pub_date

2007-09-01 00:00:00

pages

8002-6

issue

17

eissn

0008-5472

issn

1538-7445

pii

67/17/8002

journal_volume

67

pub_type

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