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|Title:||Depletion of p21-activated kinase 1 up-regulates the immune system of APC∆14/+ mice and inhibits intestinal tumorigenesis.|
|Authors:||Huynh, Nhi;Wang, Kai;Yim, Mildred;Dumesny, Chelsea J;Sandrin, Mauro S;Baldwin, Graham S;Nikfarjam, Mehrdad;He, Hong|
|Affiliation:||Department of Surgery, Austin Health, The University of Melbourne, Heidelberg, Victoria, Australia|
|Citation:||BMC cancer 2017; 17(1): 431|
|Abstract:||P21-activated kinase 1 (PAK1) stimulates growth and metastasis of colorectal cancer (CRC) through activation of multiple signalling pathways. Up-regulation of CRC stem cell markers by PAK1 also contributes to the resistance of CRC to 5-fluorouracil. The aim of this study was to investigate the effect of PAK1 depletion and inhibition on the immune system and on intestinal tumour formation in APC∆14/+ mice. The PAK1 KO APC∆14/+ mice were generated by cross-breeding of PAK1 KO mice with APC∆14/+ mice. Splenic lymphocytes were analysed by flow cytometry, and immunohistochemical staining. The numbers of intestinal tumours were counted. Blood cells were also counted. Compared to APC+/+ mice, the numbers of both T- and B- lymphocytes were reduced in the spleen of APC∆14/+ mice. Depletion of PAK1 in APC∆14/+ mice increased the numbers of splenic T- and B- lymphocytes and decreased the numbers of intestinal tumours. Treatment of APC∆14/+ mice with PF-3758309, a PAK inhibitor reduced the numbers of intestinal tumours and increased the numbers of blood lymphocytes. Depletion of active PAK1 up-regulates the immune system of APC∆14/+ mice and suppresses intestinal tumour development. These observations suggest an important role for PAK1 in the immune response to tumours.|
|Appears in Collections:||Journal articles|
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