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Combined genomic and phenotype screening reveals secretory factor SPINK1 as an invasion and survival factor associated with patient prognosis in breast cancer.

Soon WW, Miller LD, Black MA, Dalmasso C, Chan XB, Pang B, Ong CW, Salto-Tellez M, Desai KV, Liu ET - EMBO Mol Med (2011)

Bottom Line: In ER- cases, the prognostic effect did not reach statistical significance.Intriguingly, these anti-apoptotic effects of SPINK1 were abrogated by mutations of its protease inhibition domain.Because SPINK1 effects are abrogated by neutralizing antibodies, we suggest that SPINK1 is a viable potential therapeutic target in breast cancer.

View Article: PubMed Central - PubMed

Affiliation: Cancer Biology and Pharmacology, Genome Institute of Singapore.

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Induction of resistance to chemically induced apoptosisParental MCF-7 cells were pretreated with vecCM (white bars), WT SPINK1CM (black bars) or mutant K18YCM and then exposed to drugs for 24 h. Apoptosis was measured via activated PARP (left panels) and activated caspase-3 (right panels) levels. (*p < 0.005; **p < 0.05; ***p < 1E−05).5-FUSAHA
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fig09: Induction of resistance to chemically induced apoptosisParental MCF-7 cells were pretreated with vecCM (white bars), WT SPINK1CM (black bars) or mutant K18YCM and then exposed to drugs for 24 h. Apoptosis was measured via activated PARP (left panels) and activated caspase-3 (right panels) levels. (*p < 0.005; **p < 0.05; ***p < 1E−05).5-FUSAHA

Mentions: Since SPINK1 protected cells from drug-induced apoptosis, we studied the expression of a panel of pro- and anti-apoptotic genes including caspase-3, caspase-8, PARP, BID, Bcl2 and phospho-Bcl2 in MCF-7 cells treated with SPINK1-CM for 2 h. As shown, apoptosis-inhibitor Bcl2 levels were upregulated without changing caspase-3, BID, PARP and caspase-8 levels (Fig 8A and S8 of Supporting information). Interestingly, in different clones of MCF-7 SPINK1 OE cells, endogenous Bcl2 and phosphor-Bcl2 increased and caspase-3 levels decreased with increasing expression of SPINK1 (Fig 8B). The decrease in caspase-3 was, however, not evident in cells treated with SPINK1-CM (Fig 8A), perhaps indicating that prolonged high expression of SPINK1 may lead to higher chemoresistance. Since previous studies showed that the protease inhibitor function of SPINK1 is necessary for some oncogenic properties of SPINK1 (Lamontagne et al, 2010), we generated a SPINK1 K18Y mutant lacking this function (Gouyer et al, 2008; Fig S5D of Supporting information). As shown in Fig 9, pretreatment of cells with SPINK1-K18Y-CM (hatched bars) was unable to protect cells from 5 FU- (panel A) or SAHA- (panel B) induced apoptosis. Together, these data show that high SPINK1 induces chemoresistance and its protease inhibitor function is critical to mediate this effect.


Combined genomic and phenotype screening reveals secretory factor SPINK1 as an invasion and survival factor associated with patient prognosis in breast cancer.

Soon WW, Miller LD, Black MA, Dalmasso C, Chan XB, Pang B, Ong CW, Salto-Tellez M, Desai KV, Liu ET - EMBO Mol Med (2011)

Induction of resistance to chemically induced apoptosisParental MCF-7 cells were pretreated with vecCM (white bars), WT SPINK1CM (black bars) or mutant K18YCM and then exposed to drugs for 24 h. Apoptosis was measured via activated PARP (left panels) and activated caspase-3 (right panels) levels. (*p < 0.005; **p < 0.05; ***p < 1E−05).5-FUSAHA
© Copyright Policy
Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3377086&req=5

fig09: Induction of resistance to chemically induced apoptosisParental MCF-7 cells were pretreated with vecCM (white bars), WT SPINK1CM (black bars) or mutant K18YCM and then exposed to drugs for 24 h. Apoptosis was measured via activated PARP (left panels) and activated caspase-3 (right panels) levels. (*p < 0.005; **p < 0.05; ***p < 1E−05).5-FUSAHA
Mentions: Since SPINK1 protected cells from drug-induced apoptosis, we studied the expression of a panel of pro- and anti-apoptotic genes including caspase-3, caspase-8, PARP, BID, Bcl2 and phospho-Bcl2 in MCF-7 cells treated with SPINK1-CM for 2 h. As shown, apoptosis-inhibitor Bcl2 levels were upregulated without changing caspase-3, BID, PARP and caspase-8 levels (Fig 8A and S8 of Supporting information). Interestingly, in different clones of MCF-7 SPINK1 OE cells, endogenous Bcl2 and phosphor-Bcl2 increased and caspase-3 levels decreased with increasing expression of SPINK1 (Fig 8B). The decrease in caspase-3 was, however, not evident in cells treated with SPINK1-CM (Fig 8A), perhaps indicating that prolonged high expression of SPINK1 may lead to higher chemoresistance. Since previous studies showed that the protease inhibitor function of SPINK1 is necessary for some oncogenic properties of SPINK1 (Lamontagne et al, 2010), we generated a SPINK1 K18Y mutant lacking this function (Gouyer et al, 2008; Fig S5D of Supporting information). As shown in Fig 9, pretreatment of cells with SPINK1-K18Y-CM (hatched bars) was unable to protect cells from 5 FU- (panel A) or SAHA- (panel B) induced apoptosis. Together, these data show that high SPINK1 induces chemoresistance and its protease inhibitor function is critical to mediate this effect.

Bottom Line: In ER- cases, the prognostic effect did not reach statistical significance.Intriguingly, these anti-apoptotic effects of SPINK1 were abrogated by mutations of its protease inhibition domain.Because SPINK1 effects are abrogated by neutralizing antibodies, we suggest that SPINK1 is a viable potential therapeutic target in breast cancer.

View Article: PubMed Central - PubMed

Affiliation: Cancer Biology and Pharmacology, Genome Institute of Singapore.

Show MeSH
Related in: MedlinePlus