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Prognostic significance of STAT3 and phosphorylated STAT3 in human soft tissue tumors - a clinicopathological analysis.

David D, Rajappan LM, Balachandran K, Thulaseedharan JV, Nair AS, Pillai RM - J. Exp. Clin. Cancer Res. (2011)

Bottom Line: Its aberrant activation has been demonstrated to correlate with many types of human malignancy.Statistical analysis was done using Intercooled Stata software (Intercooled Stata 8.2 version).These findings suggest that constitutive activation of STAT3 is an important factor related to carcinogenesis of human soft tissue tumors and is significantly associated with its clinicopathological parameters which may possibly have potential diagnostic implications.

View Article: PubMed Central - HTML - PubMed

Affiliation: Integrated Cancer Research, Rajiv Gandhi Centre for Biotechnology, Kerala, India.

ABSTRACT

Background: Signal transducer and activator of transcription 3 (STAT3) is a key signaling molecule and a central cytoplasmic transcription factor, implicated in the regulation of growth. Its aberrant activation has been demonstrated to correlate with many types of human malignancy. However, whether constitutive STAT3 signaling plays a key role in the survival and growth of soft-tissue tumors is still unclear and hence needs to be elucidated further. In our study we examined the expression levels of STAT3 and pSTAT3 in different grades of soft tissue tumors and correlated with its clinicopathological characteristics.

Methods: Expression levels of STAT3 and pSTAT3 in soft tissue tumors were studied using Immunohistochemistry, Western blotting and Reverse transcriptase- PCR and correlated with its clinicopathological characteristics using Chi squared or Fisher's exact test and by logistic regression analysis. Statistical analysis was done using Intercooled Stata software (Intercooled Stata 8.2 version).

Results: Of the 82 soft tissue tumor samples, fifty four (65.8%) showed immunoreactivity for STAT3 and twenty eight (34.1%) for pSTAT3. Expression of STAT3 and pSTAT3 was significantly associated with tumor grade (P < 0.001; P < 0.001), tumor location (P = 0.025; P = 0.027), plane of tumor (P = 0.011; P = 0.006), and tumor necrosis (P = 0.001; P = 0.002). Western blotting and RT-PCR analysis showed increased expression of STAT3 and p-STAT3 as grade of malignancy increased.

Conclusion: These findings suggest that constitutive activation of STAT3 is an important factor related to carcinogenesis of human soft tissue tumors and is significantly associated with its clinicopathological parameters which may possibly have potential diagnostic implications.

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Related in: MedlinePlus

Representative Western blotting analysis of STAT3 and pSTAT3 in soft tissue tumor extracts. Increased expression of STAT3 and pSTAT3 were observed in high and intermediate grade soft tissue tumors compared to benign tumors. Lane 1: malignant soft tissue tumor; lane 2: intermediate soft tissue tumor; lane 3: benign soft tissue tumor. β-actin was used to verify equal gel loading.
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Figure 3: Representative Western blotting analysis of STAT3 and pSTAT3 in soft tissue tumor extracts. Increased expression of STAT3 and pSTAT3 were observed in high and intermediate grade soft tissue tumors compared to benign tumors. Lane 1: malignant soft tissue tumor; lane 2: intermediate soft tissue tumor; lane 3: benign soft tissue tumor. β-actin was used to verify equal gel loading.

Mentions: The expression levels of STAT3 and pSTAT3 were analyzed by immunoblotting in representative soft tissue tumor samples [Figure 3]. STAT3 was found to be overexpressed in malignant tumors, when compared with intermediate and benign soft tissue tumors. The malignant tumor samples showed high level expression of pSTAT3 when compared with intermediate and benign soft tissue tumors. The data also revealed that STAT3 and pSTAT3 band intensities correlated to immunohistochemistry results.


Prognostic significance of STAT3 and phosphorylated STAT3 in human soft tissue tumors - a clinicopathological analysis.

David D, Rajappan LM, Balachandran K, Thulaseedharan JV, Nair AS, Pillai RM - J. Exp. Clin. Cancer Res. (2011)

Representative Western blotting analysis of STAT3 and pSTAT3 in soft tissue tumor extracts. Increased expression of STAT3 and pSTAT3 were observed in high and intermediate grade soft tissue tumors compared to benign tumors. Lane 1: malignant soft tissue tumor; lane 2: intermediate soft tissue tumor; lane 3: benign soft tissue tumor. β-actin was used to verify equal gel loading.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3105950&req=5

Figure 3: Representative Western blotting analysis of STAT3 and pSTAT3 in soft tissue tumor extracts. Increased expression of STAT3 and pSTAT3 were observed in high and intermediate grade soft tissue tumors compared to benign tumors. Lane 1: malignant soft tissue tumor; lane 2: intermediate soft tissue tumor; lane 3: benign soft tissue tumor. β-actin was used to verify equal gel loading.
Mentions: The expression levels of STAT3 and pSTAT3 were analyzed by immunoblotting in representative soft tissue tumor samples [Figure 3]. STAT3 was found to be overexpressed in malignant tumors, when compared with intermediate and benign soft tissue tumors. The malignant tumor samples showed high level expression of pSTAT3 when compared with intermediate and benign soft tissue tumors. The data also revealed that STAT3 and pSTAT3 band intensities correlated to immunohistochemistry results.

Bottom Line: Its aberrant activation has been demonstrated to correlate with many types of human malignancy.Statistical analysis was done using Intercooled Stata software (Intercooled Stata 8.2 version).These findings suggest that constitutive activation of STAT3 is an important factor related to carcinogenesis of human soft tissue tumors and is significantly associated with its clinicopathological parameters which may possibly have potential diagnostic implications.

View Article: PubMed Central - HTML - PubMed

Affiliation: Integrated Cancer Research, Rajiv Gandhi Centre for Biotechnology, Kerala, India.

ABSTRACT

Background: Signal transducer and activator of transcription 3 (STAT3) is a key signaling molecule and a central cytoplasmic transcription factor, implicated in the regulation of growth. Its aberrant activation has been demonstrated to correlate with many types of human malignancy. However, whether constitutive STAT3 signaling plays a key role in the survival and growth of soft-tissue tumors is still unclear and hence needs to be elucidated further. In our study we examined the expression levels of STAT3 and pSTAT3 in different grades of soft tissue tumors and correlated with its clinicopathological characteristics.

Methods: Expression levels of STAT3 and pSTAT3 in soft tissue tumors were studied using Immunohistochemistry, Western blotting and Reverse transcriptase- PCR and correlated with its clinicopathological characteristics using Chi squared or Fisher's exact test and by logistic regression analysis. Statistical analysis was done using Intercooled Stata software (Intercooled Stata 8.2 version).

Results: Of the 82 soft tissue tumor samples, fifty four (65.8%) showed immunoreactivity for STAT3 and twenty eight (34.1%) for pSTAT3. Expression of STAT3 and pSTAT3 was significantly associated with tumor grade (P < 0.001; P < 0.001), tumor location (P = 0.025; P = 0.027), plane of tumor (P = 0.011; P = 0.006), and tumor necrosis (P = 0.001; P = 0.002). Western blotting and RT-PCR analysis showed increased expression of STAT3 and p-STAT3 as grade of malignancy increased.

Conclusion: These findings suggest that constitutive activation of STAT3 is an important factor related to carcinogenesis of human soft tissue tumors and is significantly associated with its clinicopathological parameters which may possibly have potential diagnostic implications.

Show MeSH
Related in: MedlinePlus