p38α and p38δ mitogen-activated protein kinase isoforms regulate invasion and growth of head and neck squamous carcinoma cells

Recent studies indicate that the specificity of p38 mitogen-activated protein kinase (MAPK)-mediated cellular stress responses is determined by the expression pattern of the distinct p38 isoforms. Here, we have analysed the function of distinct p38 isoforms in the growth and invasion of head and nec...

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Veröffentlicht in:Oncogene 2007-08, Vol.26 (36), p.5267-5279
Hauptverfasser: Junttila, M R, Ala-aho, R, Jokilehto, T, Peltonen, J, Kallajoki, M, Grenman, R, Jaakkola, P, Westermarck, J, Kähäri, V-M
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container_end_page 5279
container_issue 36
container_start_page 5267
container_title Oncogene
container_volume 26
creator Junttila, M R
Ala-aho, R
Jokilehto, T
Peltonen, J
Kallajoki, M
Grenman, R
Jaakkola, P
Westermarck, J
Kähäri, V-M
description Recent studies indicate that the specificity of p38 mitogen-activated protein kinase (MAPK)-mediated cellular stress responses is determined by the expression pattern of the distinct p38 isoforms. Here, we have analysed the function of distinct p38 isoforms in the growth and invasion of head and neck squamous cell carcinomas (HNSCCs). Activation of p38 MAPK by arsenite resulted in inactivation of the ERK1,2 signaling pathway by dephosphorylation of MEK1,2 in primary human epidermal keratinocytes (HEKs), whereas in HNSCC cells this p38-mediated inhibition of the ERK1,2 pathway was absent. Quantitation of p38 pathway component mRNA expression in HNSCC cell lines ( n =42) compared to HEKs ( n =8) revealed that p38 α and p38 δ isoforms are predominantly expressed in both cell types and that MKK3 is the primary upstream activator expressed. Inhibition of endogenous p38 α or p38 δ activity by adenoviral delivery of corresponding dominant-negative p38 isoforms potently reduced MMP-13 and MMP-1 expressions, and suppressed the invasion of HNSCC cells through collagen. Dominant-negative p38 α and p38 δ inhibited squamous cell carcinoma (SCC) cell proliferation and inhibition of p38 α activity also compromised survival of SCC cells. p38 α and p38 δ were predominantly expressed in HNSCCs ( n =24) and nonneoplastic epithelium in vivo ( n =6), with MKK3 being the primary upstream activator. Activation and expression of p38 α and p38 δ by tumor cells was detected in HNSCCs in vivo ( n =16). Adenoviral expression of dominant-negative p38 α or p38 δ in cutaneous SCC cells potently inhibited their implantation in skin of severe combined immunodeficiency mice and growth of xenografts in vivo . Our results indicate that p38 α and p38 δ specifically promote the malignant phenotype of SCC cells by regulating cell survival, proliferation and invasion, suggesting these p38 MAPK isoforms as potential therapeutic targets in HNSCCs.
doi_str_mv 10.1038/sj.onc.1210332
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Here, we have analysed the function of distinct p38 isoforms in the growth and invasion of head and neck squamous cell carcinomas (HNSCCs). Activation of p38 MAPK by arsenite resulted in inactivation of the ERK1,2 signaling pathway by dephosphorylation of MEK1,2 in primary human epidermal keratinocytes (HEKs), whereas in HNSCC cells this p38-mediated inhibition of the ERK1,2 pathway was absent. Quantitation of p38 pathway component mRNA expression in HNSCC cell lines ( n =42) compared to HEKs ( n =8) revealed that p38 α and p38 δ isoforms are predominantly expressed in both cell types and that MKK3 is the primary upstream activator expressed. Inhibition of endogenous p38 α or p38 δ activity by adenoviral delivery of corresponding dominant-negative p38 isoforms potently reduced MMP-13 and MMP-1 expressions, and suppressed the invasion of HNSCC cells through collagen. Dominant-negative p38 α and p38 δ inhibited squamous cell carcinoma (SCC) cell proliferation and inhibition of p38 α activity also compromised survival of SCC cells. p38 α and p38 δ were predominantly expressed in HNSCCs ( n =24) and nonneoplastic epithelium in vivo ( n =6), with MKK3 being the primary upstream activator. Activation and expression of p38 α and p38 δ by tumor cells was detected in HNSCCs in vivo ( n =16). Adenoviral expression of dominant-negative p38 α or p38 δ in cutaneous SCC cells potently inhibited their implantation in skin of severe combined immunodeficiency mice and growth of xenografts in vivo . Our results indicate that p38 α and p38 δ specifically promote the malignant phenotype of SCC cells by regulating cell survival, proliferation and invasion, suggesting these p38 MAPK isoforms as potential therapeutic targets in HNSCCs.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><doi>10.1038/sj.onc.1210332</doi><tpages>13</tpages><oa>free_for_read</oa></addata></record>
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subjects Apoptosis
Arsenite
Biological and medical sciences
Cell activation
Cell Biology
Cell physiology
Cell proliferation
Cell survival
Cell transformation and carcinogenesis. Action of oncogenes and antioncogenes
Collagen
Collagenase 3
Dephosphorylation
Development and progression
Epithelium
Extracellular signal-regulated kinase
Fundamental and applied biological sciences. Psychology
Gene expression
Genetic aspects
Genetic regulation
Head & neck cancer
Head and neck cancer
Head and neck carcinoma
Human Genetics
Internal Medicine
Interstitial collagenase
Isoforms
Keratinocytes
Kinases
MAP kinase
Matrix metalloproteinase
Medical sciences
Medicine
Medicine & Public Health
MKK3 protein
Molecular and cellular biology
Oncology
original-article
Otorhinolaryngology (head neck, general aspects and miscellaneous)
Otorhinolaryngology. Stomatology
Phenotypes
Protein kinase
Quantitation
Severe combined immunodeficiency
Signal transduction
Squamous cell carcinoma
Tumor cells
Tumor suppressor genes
Tumors
Xenografts
title p38α and p38δ mitogen-activated protein kinase isoforms regulate invasion and growth of head and neck squamous carcinoma cells
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