STING-dependent paracriny shapes apoptotic priming of breast tumors in response to anti-mitotic treatment
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ABSTRACT:
PROVIDER: PRJNA589884 | ENA |
REPOSITORIES: ENA
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Project description:A fascinating but uncharacterized action of antimitotic chemotherapy is to collectively prime cancer cells to apoptotic mitochondrial outer membrane permeabilization (MOMP), while impacting only on cycling cell subsets. Here, we show that a proapoptotic secretory phenotype is induced by activation of cGAS/STING in cancer cells that are hit by antimitotic treatment, accumulate micronuclei and maintain mitochondrial integrity despite intrinsic apoptotic pressure. Organotypic cultures of primary human breast tumors and patient-derived xenografts sensitive to paclitaxel exhibit gene expression signatures typical of type I IFN and TNFalpha exposure. These cytokines induced by cGAS/STING activation trigger NOXA expression in neighboring cells and render them acutely sensitive to BCL-xL inhibition. cGAS/STING-dependent apoptotic effects are required for paclitaxel response in vivo, and they are amplified by sequential, but not synchronous, administration of BH3 mimetics. Thus anti-mitotic agents propagate apoptotic priming across heterogeneously sensitive cancer cells through cytosolic DNA sensing pathway-dependent extracellular signals, exploitable by delayed MOMP targeting.
2019-11-21 | GSE140489 | GEO
Project description:A fascinating but uncharacterized action of antimitotic chemotherapy is to collectively prime cancer cells to apoptotic mitochondrial outer membrane permeabilization (MOMP), while impacting only on cycling cell subsets. Here, we show that a proapoptotic secretory phenotype is induced by activation of cGAS/STING in cancer cells that are hit by antimitotic treatment, accumulate micronuclei and maintain mitochondrial integrity despite intrinsic apoptotic pressure. Organotypic cultures of primary human breast tumors and patient-derived xenografts sensitive to paclitaxel exhibit gene expression signatures typical of type I IFN and TNFα exposure. These cytokines induced by cGAS/STING activation trigger NOXA expression in neighboring cells and render them acutely sensitive to BCL-xL inhibition. cGAS/STING-dependent apoptotic effects are required for paclitaxel response in vivo, and they are amplified by sequential, but not synchronous, administration of BH3 mimetics. Thus anti-mitotic agents propagate apoptotic priming across heterogeneously sensitive cancer cells through cytosolic DNA sensing pathway-dependent extracellular signals, exploitable by delayed MOMP targeting.
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Project description:The mitotic STAG3–cohesin complex shapes male germline nucleome
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Project description:Germ cells are unique in that they tailor chromatin toward generating totipotency. Accordingly, mammalian spermatogonia, including spermatogonial stem cells (SSCs) which constitute the source for male gametes, acquire distinctive chromatin organization with weak insulation, but the underlying mechanism remains unknown. Here, we show that STAG3, this far known to exclusively form meiotic cohesins, generates a mitotic cohesin for male germline nucleome programming in mice. Due to its shorter chromatin residence, STAG3–cohesin attenuates topologically associating domains (TADs), rewires enhancer–promoter and Polycomb-mediated repressive interactions, and facilitates finer and more strengthened compartments, establishing a distinctive spermatogonial nucleome. Moreover, in the absence of STAG3–cohesin, SSCs show an impaired differentiation priming for spermatogenesis. Mitotic STAG3–cohesin is also expressed in human B cells and their malignant variations, promoting their propagation. Our findings on mitotic STAG3–cohesin elucidate a principle of male germline nucleome programming, demonstrate an unexpected mitotic role for STAG3 and might potentially improve understanding of human malignancies.
2025-07-07 | GSE243959 | GEO
Project description:Germ cells are unique in that they tailor chromatin toward generating totipotency. Accordingly, mammalian spermatogonia, including spermatogonial stem cells (SSCs) which constitute the source for male gametes, acquire distinctive chromatin organization with weak insulation, but the underlying mechanism remains unknown. Here, we show that STAG3, this far known to exclusively form meiotic cohesins, generates a mitotic cohesin for male germline nucleome programming in mice. Due to its shorter chromatin residence, STAG3–cohesin attenuates topologically associating domains (TADs), rewires enhancer–promoter and Polycomb-mediated repressive interactions, and facilitates finer and more strengthened compartments, establishing a distinctive spermatogonial nucleome. Moreover, in the absence of STAG3–cohesin, SSCs show an impaired differentiation priming for spermatogenesis. Mitotic STAG3–cohesin is also expressed in human B cells and their malignant variations, promoting their propagation. Our findings on mitotic STAG3–cohesin elucidate a principle of male germline nucleome programming, demonstrate an unexpected mitotic role for STAG3 and might potentially improve understanding of human malignancies.
2025-07-07 | GSE243958 | GEO
Project description:Germ cells are unique in that they tailor chromatin toward generating totipotency. Accordingly, mammalian spermatogonia, including spermatogonial stem cells (SSCs) which constitute the source for male gametes, acquire distinctive chromatin organization with weak insulation, but the underlying mechanism remains unknown. Here, we show that STAG3, this far known to exclusively form meiotic cohesins, generates a mitotic cohesin for male germline nucleome programming in mice. Due to its shorter chromatin residence, STAG3–cohesin attenuates topologically associating domains (TADs), rewires enhancer–promoter and Polycomb-mediated repressive interactions, and facilitates finer and more strengthened compartments, establishing a distinctive spermatogonial nucleome. Moreover, in the absence of STAG3–cohesin, SSCs show an impaired differentiation priming for spermatogenesis. Mitotic STAG3–cohesin is also expressed in human B cells and their malignant variations, promoting their propagation. Our findings on mitotic STAG3–cohesin elucidate a principle of male germline nucleome programming, demonstrate an unexpected mitotic role for STAG3 and might potentially improve understanding of human malignancies.
2025-07-07 | GSE243961 | GEO
Project description:Germ cells are unique in that they tailor chromatin toward generating totipotency. Accordingly, mammalian spermatogonia, including spermatogonial stem cells (SSCs) which constitute the source for male gametes, acquire distinctive chromatin organization with weak insulation, but the underlying mechanism remains unknown. Here, we show that STAG3, this far known to exclusively form meiotic cohesins, generates a mitotic cohesin for male germline nucleome programming in mice. Due to its shorter chromatin residence, STAG3–cohesin attenuates topologically associating domains (TADs), rewires enhancer–promoter and Polycomb-mediated repressive interactions, and facilitates finer and more strengthened compartments, establishing a distinctive spermatogonial nucleome. Moreover, in the absence of STAG3–cohesin, SSCs show an impaired differentiation priming for spermatogenesis. Mitotic STAG3–cohesin is also expressed in human B cells and their malignant variations, promoting their propagation. Our findings on mitotic STAG3–cohesin elucidate a principle of male germline nucleome programming, demonstrate an unexpected mitotic role for STAG3 and might potentially improve understanding of human malignancies.
2025-07-07 | GSE243960 | GEO
Project description:Leukemia cell of origin influences apoptotic priming and sensitivity to LSD1 inhibition
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Project description:Germ cells are unique in that they tailor chromatin toward generating totipotency. Accordingly, mammalian spermatogonia, including spermatogonial stem cells (SSCs) which constitute the source for male gametes, acquire distinctive chromatin organization with weak insulation, but the underlying mechanism remains unknown. Here, we show that STAG3, this far known to exclusively form meiotic cohesins, generates a mitotic cohesin for male germline nucleome programming in mice. Due to its shorter chromatin residence, STAG3–cohesin attenuates topologically associating domains (TADs), rewires enhancer–promoter and Polycomb-mediated repressive interactions, and facilitates finer and more strengthened compartments, establishing a distinctive spermatogonial nucleome. Moreover, in the absence of STAG3–cohesin, SSCs show an impaired differentiation priming for spermatogenesis. Mitotic STAG3–cohesin is also expressed in human B cells and their malignant variations, promoting their propagation. Our findings on mitotic STAG3–cohesin elucidate a principle of male germline nucleome programming, demonstrate an unexpected mitotic role for STAG3 and might potentially improve understanding of human malignancies.
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