TY - JOUR
T1 - miR-181a Promotes Multiple Protumorigenic Functions by Targeting TGFβR3
AU - Chitsazzadeh, Vida
AU - Nguyen, Tran N.
AU - de Mingo Pulido, Alvaro
AU - Bittencourt, Bruna B.
AU - Du, Lili
AU - Adelmann, Charles H.
AU - Ortiz Rivera, Ivannie
AU - Nguyen, Kimberly A.
AU - Guerra, Leah D.
AU - Davis, Andrew
AU - Napoli, Marco
AU - Ma, Wencai
AU - Davis, Richard Eric
AU - Rajapakshe, Kimal
AU - Coarfa, Cristian
AU - Flores, Elsa R.
AU - Tsai, Kenneth Y.
N1 - Publisher Copyright:
© 2021 The Authors
PY - 2022/7
Y1 - 2022/7
N2 - Cutaneous squamous cell carcinoma (cSCC) comprises 15‒20% of all skin cancers and has a well-defined progression sequence from precancerous actinic keratosis to invasive cSCC. To identify targets for chemoprevention, we previously reported a cross-species analysis to identify the transcriptional drivers of cSCC development and identified miR-181a as a potential oncomiR. We show that the upregulation of miR-181a promotes multiple protumorigenic properties by targeting an understudied component of TGFβ signaling, TGFβR3. miR-181a and TGFβR3 are upregulated and downregulated, respectively, in cSCC. miR-181a overexpression (OE) and TGFβR3 knockdown (KD) significantly suppresses UV-induced apoptosis in HaCaT cells and in primary normal human epidermal keratinocytes. In addition, OE of miR-181a or KD of TGFβR3 by short hairpin RNA enhances anchorage-independent survival. miR-181a OE or TGFβR3 KD enhances cellular migration and invasion and upregulation of epithelial‒mesenchymal transition markers. Luciferase reporter assays demonstrate that miR-181a directly targets the 3′-untranslated region of TGFβR3. miR-181a upregulates phosphorylated SMAD3 levels after TGFβ2 administration and results in elevated SNAIL and SLUG expression. Finally, we confirm in vivo that miR-181a inhibition compromises tumor growth. Importantly, these phenotypes can be reversed with TGFβR3 OE or KD in the context of miR-181a OE or KD, respectively, further highlighting the physiologic relevance of this regulation in cSCC.
AB - Cutaneous squamous cell carcinoma (cSCC) comprises 15‒20% of all skin cancers and has a well-defined progression sequence from precancerous actinic keratosis to invasive cSCC. To identify targets for chemoprevention, we previously reported a cross-species analysis to identify the transcriptional drivers of cSCC development and identified miR-181a as a potential oncomiR. We show that the upregulation of miR-181a promotes multiple protumorigenic properties by targeting an understudied component of TGFβ signaling, TGFβR3. miR-181a and TGFβR3 are upregulated and downregulated, respectively, in cSCC. miR-181a overexpression (OE) and TGFβR3 knockdown (KD) significantly suppresses UV-induced apoptosis in HaCaT cells and in primary normal human epidermal keratinocytes. In addition, OE of miR-181a or KD of TGFβR3 by short hairpin RNA enhances anchorage-independent survival. miR-181a OE or TGFβR3 KD enhances cellular migration and invasion and upregulation of epithelial‒mesenchymal transition markers. Luciferase reporter assays demonstrate that miR-181a directly targets the 3′-untranslated region of TGFβR3. miR-181a upregulates phosphorylated SMAD3 levels after TGFβ2 administration and results in elevated SNAIL and SLUG expression. Finally, we confirm in vivo that miR-181a inhibition compromises tumor growth. Importantly, these phenotypes can be reversed with TGFβR3 OE or KD in the context of miR-181a OE or KD, respectively, further highlighting the physiologic relevance of this regulation in cSCC.
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U2 - 10.1016/j.jid.2021.09.040
DO - 10.1016/j.jid.2021.09.040
M3 - Article
C2 - 34890627
AN - SCOPUS:85123000966
SN - 0022-202X
VL - 142
SP - 1956-1965.e2
JO - Journal of Investigative Dermatology
JF - Journal of Investigative Dermatology
IS - 7
ER -