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p ret y905  (Cell Signaling Technology Inc)


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    Cell Signaling Technology Inc p ret y905
    (A) <t>RET</t> pathway activation scores between breast cancer patients with no metastases vs. brain metastases using GEO breast cancer datasets (GSE2034, GSE2603, GSE5327, GSE12276, GSE14020). An unpaired, two-tailed t-test was used in panel (A). (B) Pearson correlation analysis using GEO correlating RET activation signatures to a breast-to-brain metastasis signature. (C) Using the Kaplan-Meier analysis, log-rank analyses, GEO datasets, and the RET activation signatures, 672 breast cancer patients were stratified into two groups, either a high or low RET pathway activation for overall metastasis-free survival. Median of overall metastasis-free survival times are indicated in months (N=672). (D) High versus low RET activation scores were analyzed for brain metastasis-free survival (N = 318). (E) IHC staining of p-RET <t>(Y905)</t> expression levels in 15 matched pairs of primary breast tumors and their corresponding BCBM samples either luminal, HER2-enriched, or TNBC subtypes (20X images presented). (F) H-score quantification of p-RET (Y905) positivity, presented as a ladder plot (N=15). A paired, two-tailed t-test was used.
    P Ret Y905, supplied by Cell Signaling Technology Inc, used in various techniques. Bioz Stars score: 94/100, based on 103 PubMed citations. ZERO BIAS - scores, article reviews, protocol conditions and more
    https://www.bioz.com/product/ret+tyr905+p+ret/Phospho-Ret+(Tyr905)+Antibody/bio_rxiv__2025__10__07__680986-57-5-7
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    Images

    1) Product Images from "RET Receptor Tyrosine Kinase Promotes Breast Cancer Metastasis to the Brain and RET Inhibitors Pralsetinib and Selpercatinib Suppress Breast Cancer Brain Metastases"

    Article Title: RET Receptor Tyrosine Kinase Promotes Breast Cancer Metastasis to the Brain and RET Inhibitors Pralsetinib and Selpercatinib Suppress Breast Cancer Brain Metastases

    Journal: bioRxiv

    doi: 10.1101/2025.10.07.680986

    (A) RET pathway activation scores between breast cancer patients with no metastases vs. brain metastases using GEO breast cancer datasets (GSE2034, GSE2603, GSE5327, GSE12276, GSE14020). An unpaired, two-tailed t-test was used in panel (A). (B) Pearson correlation analysis using GEO correlating RET activation signatures to a breast-to-brain metastasis signature. (C) Using the Kaplan-Meier analysis, log-rank analyses, GEO datasets, and the RET activation signatures, 672 breast cancer patients were stratified into two groups, either a high or low RET pathway activation for overall metastasis-free survival. Median of overall metastasis-free survival times are indicated in months (N=672). (D) High versus low RET activation scores were analyzed for brain metastasis-free survival (N = 318). (E) IHC staining of p-RET (Y905) expression levels in 15 matched pairs of primary breast tumors and their corresponding BCBM samples either luminal, HER2-enriched, or TNBC subtypes (20X images presented). (F) H-score quantification of p-RET (Y905) positivity, presented as a ladder plot (N=15). A paired, two-tailed t-test was used.
    Figure Legend Snippet: (A) RET pathway activation scores between breast cancer patients with no metastases vs. brain metastases using GEO breast cancer datasets (GSE2034, GSE2603, GSE5327, GSE12276, GSE14020). An unpaired, two-tailed t-test was used in panel (A). (B) Pearson correlation analysis using GEO correlating RET activation signatures to a breast-to-brain metastasis signature. (C) Using the Kaplan-Meier analysis, log-rank analyses, GEO datasets, and the RET activation signatures, 672 breast cancer patients were stratified into two groups, either a high or low RET pathway activation for overall metastasis-free survival. Median of overall metastasis-free survival times are indicated in months (N=672). (D) High versus low RET activation scores were analyzed for brain metastasis-free survival (N = 318). (E) IHC staining of p-RET (Y905) expression levels in 15 matched pairs of primary breast tumors and their corresponding BCBM samples either luminal, HER2-enriched, or TNBC subtypes (20X images presented). (F) H-score quantification of p-RET (Y905) positivity, presented as a ladder plot (N=15). A paired, two-tailed t-test was used.

    Techniques Used: Activation Assay, Two Tailed Test, Immunohistochemistry, Expressing

    (A) Schematic of intracranial mouse model. 6–7-week-old athymic nude mice were intracranially inoculated with luciferase-expressing MDA-MB-231-RET cells (N=12) or MDA-MB-231-Ctrl cells (N=11). Mice were imaged twice weekly to monitor tumor formation and growth. At the study endpoint (Day 28), mice were euthanized, and organs were collected for ex vivo analyses. (B) Bi-weekly average brain tumor burden per group throughout the study, assessed by BLI (top). Representative BLI images from Day 28 (bottom). (C) Quantification of ex vivo BLI of brains (top). Representative BLI images of ex vivo brain (bottom). (D) IHC staining of p-RET (Y905) and Ki-67 expression levels in brain tumors (scale bar 100µm). (E) H-score quantification of p-RET (Y905) positivity and Ki-67 positivity. (F) Tumor retention rate following inoculation. (H) Average weight of mice in each group. Two-way ANOVAs were used to calculate p-values with a mixed-effects analysis for panels (B and G). An unpaired, two-tailed t-test was used in panels (C and E).
    Figure Legend Snippet: (A) Schematic of intracranial mouse model. 6–7-week-old athymic nude mice were intracranially inoculated with luciferase-expressing MDA-MB-231-RET cells (N=12) or MDA-MB-231-Ctrl cells (N=11). Mice were imaged twice weekly to monitor tumor formation and growth. At the study endpoint (Day 28), mice were euthanized, and organs were collected for ex vivo analyses. (B) Bi-weekly average brain tumor burden per group throughout the study, assessed by BLI (top). Representative BLI images from Day 28 (bottom). (C) Quantification of ex vivo BLI of brains (top). Representative BLI images of ex vivo brain (bottom). (D) IHC staining of p-RET (Y905) and Ki-67 expression levels in brain tumors (scale bar 100µm). (E) H-score quantification of p-RET (Y905) positivity and Ki-67 positivity. (F) Tumor retention rate following inoculation. (H) Average weight of mice in each group. Two-way ANOVAs were used to calculate p-values with a mixed-effects analysis for panels (B and G). An unpaired, two-tailed t-test was used in panels (C and E).

    Techniques Used: Luciferase, Expressing, Ex Vivo, Immunohistochemistry, Two Tailed Test

    RET inhibitors reduce cell viability, suppress downstream RET signaling, and induce apoptosis in brain-tropic breast cancer cells in vitro . The effect of treatment with (A) pralsetinib or (B) selpercatinib on cell viability of brain-tropic breast cancer cell lines (N=5). (C) Western blot analysis to determine protein expression of p-RET (Y905), p-STAT3 (Y705), total RET, total STAT3, p-ERK (T202/Y204), and total ERK ½ following treatment with prasetinib (left) or selpercatinib (right). Vinculin serves as high molecular weight loading control, and β-actin serves as a low molecular weight loading control. Annexin V/PI flow cytometry co-staining of (D) SKBRM cells, (E) CN34-BrM cells, and (F) MDA-MB-231-BrM cells treated with pralsetinib or selpercatinib (quantification on the left and representative images on the right) (N=5). Western blot analysis of cleaved PARP and full-length PARP in brain-tropic breast cancer cells following treatment with (G) pralsetinib, or (H) selpercatinib. An unpaired, two-tailed t-test between vehicle and treatment was used in panels (A,B,D,E and F).
    Figure Legend Snippet: RET inhibitors reduce cell viability, suppress downstream RET signaling, and induce apoptosis in brain-tropic breast cancer cells in vitro . The effect of treatment with (A) pralsetinib or (B) selpercatinib on cell viability of brain-tropic breast cancer cell lines (N=5). (C) Western blot analysis to determine protein expression of p-RET (Y905), p-STAT3 (Y705), total RET, total STAT3, p-ERK (T202/Y204), and total ERK ½ following treatment with prasetinib (left) or selpercatinib (right). Vinculin serves as high molecular weight loading control, and β-actin serves as a low molecular weight loading control. Annexin V/PI flow cytometry co-staining of (D) SKBRM cells, (E) CN34-BrM cells, and (F) MDA-MB-231-BrM cells treated with pralsetinib or selpercatinib (quantification on the left and representative images on the right) (N=5). Western blot analysis of cleaved PARP and full-length PARP in brain-tropic breast cancer cells following treatment with (G) pralsetinib, or (H) selpercatinib. An unpaired, two-tailed t-test between vehicle and treatment was used in panels (A,B,D,E and F).

    Techniques Used: In Vitro, Western Blot, Expressing, High Molecular Weight, Control, Molecular Weight, Flow Cytometry, Staining, Two Tailed Test

    Systemic administration of pralsetinib selectively reduces established brain metastatic tumor growth and proliferation in vivo . (A) Schematic of intracranial inoculation mouse model. 6–7-week-old athymic nude mice (N=10/group) were inoculated with luciferase-expressing MDA-MB-231-BrM cells. Mice received their first treatment 2 days after inoculation and were treated 5 times a week and imaged twice a week to monitor tumor growth. At the study endpoint (Day 24), mice were euthanized, and brains were collected for ex vivo analyses. (B) Weekly average metastatic burden per group throughout the study, assessed by BLI (bottom), and representative BLI images from Day 25(top), vehicle N = 9 and Pralsetinib N = 10. (C) Representative BLI images of ex vivo brain (top). Quantification of ex vivo BLI of brains (bottom). (D) Circulating ALT levels between treatment groups. (E) The average weight of mice throughout the study. (F) IHC staining of p-RET (Y905) and Ki-67 expression levels in brain tumors (left) (scale bar = 100µm), and H-score quantification of p-RET (Y905) positivity and Ki-67 positivity (right). (G) Fluorescent TUNEL assay on mouse brain tumors. Images of representative fields show nuclei from control and treated tumors (left) (scale bar = 100µm). Two-way ANOVAs were used to calculate p-values with a mixed-effects analysis for panels (B and E). An unpaired, two-tailed t-test was used in panels (C, D, F and G).
    Figure Legend Snippet: Systemic administration of pralsetinib selectively reduces established brain metastatic tumor growth and proliferation in vivo . (A) Schematic of intracranial inoculation mouse model. 6–7-week-old athymic nude mice (N=10/group) were inoculated with luciferase-expressing MDA-MB-231-BrM cells. Mice received their first treatment 2 days after inoculation and were treated 5 times a week and imaged twice a week to monitor tumor growth. At the study endpoint (Day 24), mice were euthanized, and brains were collected for ex vivo analyses. (B) Weekly average metastatic burden per group throughout the study, assessed by BLI (bottom), and representative BLI images from Day 25(top), vehicle N = 9 and Pralsetinib N = 10. (C) Representative BLI images of ex vivo brain (top). Quantification of ex vivo BLI of brains (bottom). (D) Circulating ALT levels between treatment groups. (E) The average weight of mice throughout the study. (F) IHC staining of p-RET (Y905) and Ki-67 expression levels in brain tumors (left) (scale bar = 100µm), and H-score quantification of p-RET (Y905) positivity and Ki-67 positivity (right). (G) Fluorescent TUNEL assay on mouse brain tumors. Images of representative fields show nuclei from control and treated tumors (left) (scale bar = 100µm). Two-way ANOVAs were used to calculate p-values with a mixed-effects analysis for panels (B and E). An unpaired, two-tailed t-test was used in panels (C, D, F and G).

    Techniques Used: In Vivo, Luciferase, Expressing, Ex Vivo, Immunohistochemistry, TUNEL Assay, Control, Two Tailed Test

    Related Articles

    Western Blot:

    Article Title: Dok-6, a Novel p62 Dok Family Member, Promotes Ret-mediated Neurite Outgrowth
    Article Snippet: The blots were then blocked with 3% bovine serum albumin or 5% nonfat dry milk in TBST (0.1% Tween 20 in Tris-buffered saline), incubated with the indicated primary and appropriate horseradish peroxidase-conjugated secondary antibodies (1:30,000 dilution; Jackson Immunoresearch Laboratories, Inc., West Grove, PA), and processed to detect specific proteins as previously described (43). .. The sources and dilutions of primary antibodies used for immunoblot analyses were as follows: rabbit antiphosphotyrosine specific Ret Tyr905 (P-Ret) (43) was diluted 1:1000; rabbit polyclonal antibody against the extracellular domain of Ret (43) was diluted 1:1000; anti-HA, clone 12CA5 (Roche Applied Science) was diluted 1:1000 following reconstitution according to manufacturer’s protocol; mouse anti-phosphotyrosine (P-Tyr-100; Cell Signaling Technol- ogy, Beverly, MA). .. The blots were quantified using an Epi Chem II Darkroom instrument and Labworks software (UVP, Inc., Upland CA).



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    (A) <t>RET</t> pathway activation scores between breast cancer patients with no metastases vs. brain metastases using GEO breast cancer datasets (GSE2034, GSE2603, GSE5327, GSE12276, GSE14020). An unpaired, two-tailed t-test was used in panel (A). (B) Pearson correlation analysis using GEO correlating RET activation signatures to a breast-to-brain metastasis signature. (C) Using the Kaplan-Meier analysis, log-rank analyses, GEO datasets, and the RET activation signatures, 672 breast cancer patients were stratified into two groups, either a high or low RET pathway activation for overall metastasis-free survival. Median of overall metastasis-free survival times are indicated in months (N=672). (D) High versus low RET activation scores were analyzed for brain metastasis-free survival (N = 318). (E) IHC staining of p-RET <t>(Y905)</t> expression levels in 15 matched pairs of primary breast tumors and their corresponding BCBM samples either luminal, HER2-enriched, or TNBC subtypes (20X images presented). (F) H-score quantification of p-RET (Y905) positivity, presented as a ladder plot (N=15). A paired, two-tailed t-test was used.
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    (A) <t>RET</t> pathway activation scores between breast cancer patients with no metastases vs. brain metastases using GEO breast cancer datasets (GSE2034, GSE2603, GSE5327, GSE12276, GSE14020). An unpaired, two-tailed t-test was used in panel (A). (B) Pearson correlation analysis using GEO correlating RET activation signatures to a breast-to-brain metastasis signature. (C) Using the Kaplan-Meier analysis, log-rank analyses, GEO datasets, and the RET activation signatures, 672 breast cancer patients were stratified into two groups, either a high or low RET pathway activation for overall metastasis-free survival. Median of overall metastasis-free survival times are indicated in months (N=672). (D) High versus low RET activation scores were analyzed for brain metastasis-free survival (N = 318). (E) IHC staining of p-RET <t>(Y905)</t> expression levels in 15 matched pairs of primary breast tumors and their corresponding BCBM samples either luminal, HER2-enriched, or TNBC subtypes (20X images presented). (F) H-score quantification of p-RET (Y905) positivity, presented as a ladder plot (N=15). A paired, two-tailed t-test was used.
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    Image Search Results


    (A) RET pathway activation scores between breast cancer patients with no metastases vs. brain metastases using GEO breast cancer datasets (GSE2034, GSE2603, GSE5327, GSE12276, GSE14020). An unpaired, two-tailed t-test was used in panel (A). (B) Pearson correlation analysis using GEO correlating RET activation signatures to a breast-to-brain metastasis signature. (C) Using the Kaplan-Meier analysis, log-rank analyses, GEO datasets, and the RET activation signatures, 672 breast cancer patients were stratified into two groups, either a high or low RET pathway activation for overall metastasis-free survival. Median of overall metastasis-free survival times are indicated in months (N=672). (D) High versus low RET activation scores were analyzed for brain metastasis-free survival (N = 318). (E) IHC staining of p-RET (Y905) expression levels in 15 matched pairs of primary breast tumors and their corresponding BCBM samples either luminal, HER2-enriched, or TNBC subtypes (20X images presented). (F) H-score quantification of p-RET (Y905) positivity, presented as a ladder plot (N=15). A paired, two-tailed t-test was used.

    Journal: bioRxiv

    Article Title: RET Receptor Tyrosine Kinase Promotes Breast Cancer Metastasis to the Brain and RET Inhibitors Pralsetinib and Selpercatinib Suppress Breast Cancer Brain Metastases

    doi: 10.1101/2025.10.07.680986

    Figure Lengend Snippet: (A) RET pathway activation scores between breast cancer patients with no metastases vs. brain metastases using GEO breast cancer datasets (GSE2034, GSE2603, GSE5327, GSE12276, GSE14020). An unpaired, two-tailed t-test was used in panel (A). (B) Pearson correlation analysis using GEO correlating RET activation signatures to a breast-to-brain metastasis signature. (C) Using the Kaplan-Meier analysis, log-rank analyses, GEO datasets, and the RET activation signatures, 672 breast cancer patients were stratified into two groups, either a high or low RET pathway activation for overall metastasis-free survival. Median of overall metastasis-free survival times are indicated in months (N=672). (D) High versus low RET activation scores were analyzed for brain metastasis-free survival (N = 318). (E) IHC staining of p-RET (Y905) expression levels in 15 matched pairs of primary breast tumors and their corresponding BCBM samples either luminal, HER2-enriched, or TNBC subtypes (20X images presented). (F) H-score quantification of p-RET (Y905) positivity, presented as a ladder plot (N=15). A paired, two-tailed t-test was used.

    Article Snippet: The following antibodies were used: p-RET (Y905) (CST 3221s, 1:500); p-AKT (5473) (CST 9271s, 1:1000); p-ERK (T202/Y204) (CST 91015, 1:1000); p-STAT3 (CST 9131L, 1:1000); Vinculin (CST 13901s, 1:5000); RET (CST 3220s, 1:500); RET (CST 3223s, 1:1000); AKT (CST 9272s, 1:1000); ERK (CST 4695s, 1:1000); STAT3 (CST 9139, 1:1000); β-actin (CST 3700s, 1:5000); α-tubulin (Sigma-Aldrich T6074, 1:5000–10,000).

    Techniques: Activation Assay, Two Tailed Test, Immunohistochemistry, Expressing

    (A) Schematic of intracranial mouse model. 6–7-week-old athymic nude mice were intracranially inoculated with luciferase-expressing MDA-MB-231-RET cells (N=12) or MDA-MB-231-Ctrl cells (N=11). Mice were imaged twice weekly to monitor tumor formation and growth. At the study endpoint (Day 28), mice were euthanized, and organs were collected for ex vivo analyses. (B) Bi-weekly average brain tumor burden per group throughout the study, assessed by BLI (top). Representative BLI images from Day 28 (bottom). (C) Quantification of ex vivo BLI of brains (top). Representative BLI images of ex vivo brain (bottom). (D) IHC staining of p-RET (Y905) and Ki-67 expression levels in brain tumors (scale bar 100µm). (E) H-score quantification of p-RET (Y905) positivity and Ki-67 positivity. (F) Tumor retention rate following inoculation. (H) Average weight of mice in each group. Two-way ANOVAs were used to calculate p-values with a mixed-effects analysis for panels (B and G). An unpaired, two-tailed t-test was used in panels (C and E).

    Journal: bioRxiv

    Article Title: RET Receptor Tyrosine Kinase Promotes Breast Cancer Metastasis to the Brain and RET Inhibitors Pralsetinib and Selpercatinib Suppress Breast Cancer Brain Metastases

    doi: 10.1101/2025.10.07.680986

    Figure Lengend Snippet: (A) Schematic of intracranial mouse model. 6–7-week-old athymic nude mice were intracranially inoculated with luciferase-expressing MDA-MB-231-RET cells (N=12) or MDA-MB-231-Ctrl cells (N=11). Mice were imaged twice weekly to monitor tumor formation and growth. At the study endpoint (Day 28), mice were euthanized, and organs were collected for ex vivo analyses. (B) Bi-weekly average brain tumor burden per group throughout the study, assessed by BLI (top). Representative BLI images from Day 28 (bottom). (C) Quantification of ex vivo BLI of brains (top). Representative BLI images of ex vivo brain (bottom). (D) IHC staining of p-RET (Y905) and Ki-67 expression levels in brain tumors (scale bar 100µm). (E) H-score quantification of p-RET (Y905) positivity and Ki-67 positivity. (F) Tumor retention rate following inoculation. (H) Average weight of mice in each group. Two-way ANOVAs were used to calculate p-values with a mixed-effects analysis for panels (B and G). An unpaired, two-tailed t-test was used in panels (C and E).

    Article Snippet: The following antibodies were used: p-RET (Y905) (CST 3221s, 1:500); p-AKT (5473) (CST 9271s, 1:1000); p-ERK (T202/Y204) (CST 91015, 1:1000); p-STAT3 (CST 9131L, 1:1000); Vinculin (CST 13901s, 1:5000); RET (CST 3220s, 1:500); RET (CST 3223s, 1:1000); AKT (CST 9272s, 1:1000); ERK (CST 4695s, 1:1000); STAT3 (CST 9139, 1:1000); β-actin (CST 3700s, 1:5000); α-tubulin (Sigma-Aldrich T6074, 1:5000–10,000).

    Techniques: Luciferase, Expressing, Ex Vivo, Immunohistochemistry, Two Tailed Test

    RET inhibitors reduce cell viability, suppress downstream RET signaling, and induce apoptosis in brain-tropic breast cancer cells in vitro . The effect of treatment with (A) pralsetinib or (B) selpercatinib on cell viability of brain-tropic breast cancer cell lines (N=5). (C) Western blot analysis to determine protein expression of p-RET (Y905), p-STAT3 (Y705), total RET, total STAT3, p-ERK (T202/Y204), and total ERK ½ following treatment with prasetinib (left) or selpercatinib (right). Vinculin serves as high molecular weight loading control, and β-actin serves as a low molecular weight loading control. Annexin V/PI flow cytometry co-staining of (D) SKBRM cells, (E) CN34-BrM cells, and (F) MDA-MB-231-BrM cells treated with pralsetinib or selpercatinib (quantification on the left and representative images on the right) (N=5). Western blot analysis of cleaved PARP and full-length PARP in brain-tropic breast cancer cells following treatment with (G) pralsetinib, or (H) selpercatinib. An unpaired, two-tailed t-test between vehicle and treatment was used in panels (A,B,D,E and F).

    Journal: bioRxiv

    Article Title: RET Receptor Tyrosine Kinase Promotes Breast Cancer Metastasis to the Brain and RET Inhibitors Pralsetinib and Selpercatinib Suppress Breast Cancer Brain Metastases

    doi: 10.1101/2025.10.07.680986

    Figure Lengend Snippet: RET inhibitors reduce cell viability, suppress downstream RET signaling, and induce apoptosis in brain-tropic breast cancer cells in vitro . The effect of treatment with (A) pralsetinib or (B) selpercatinib on cell viability of brain-tropic breast cancer cell lines (N=5). (C) Western blot analysis to determine protein expression of p-RET (Y905), p-STAT3 (Y705), total RET, total STAT3, p-ERK (T202/Y204), and total ERK ½ following treatment with prasetinib (left) or selpercatinib (right). Vinculin serves as high molecular weight loading control, and β-actin serves as a low molecular weight loading control. Annexin V/PI flow cytometry co-staining of (D) SKBRM cells, (E) CN34-BrM cells, and (F) MDA-MB-231-BrM cells treated with pralsetinib or selpercatinib (quantification on the left and representative images on the right) (N=5). Western blot analysis of cleaved PARP and full-length PARP in brain-tropic breast cancer cells following treatment with (G) pralsetinib, or (H) selpercatinib. An unpaired, two-tailed t-test between vehicle and treatment was used in panels (A,B,D,E and F).

    Article Snippet: The following antibodies were used: p-RET (Y905) (CST 3221s, 1:500); p-AKT (5473) (CST 9271s, 1:1000); p-ERK (T202/Y204) (CST 91015, 1:1000); p-STAT3 (CST 9131L, 1:1000); Vinculin (CST 13901s, 1:5000); RET (CST 3220s, 1:500); RET (CST 3223s, 1:1000); AKT (CST 9272s, 1:1000); ERK (CST 4695s, 1:1000); STAT3 (CST 9139, 1:1000); β-actin (CST 3700s, 1:5000); α-tubulin (Sigma-Aldrich T6074, 1:5000–10,000).

    Techniques: In Vitro, Western Blot, Expressing, High Molecular Weight, Control, Molecular Weight, Flow Cytometry, Staining, Two Tailed Test

    Systemic administration of pralsetinib selectively reduces established brain metastatic tumor growth and proliferation in vivo . (A) Schematic of intracranial inoculation mouse model. 6–7-week-old athymic nude mice (N=10/group) were inoculated with luciferase-expressing MDA-MB-231-BrM cells. Mice received their first treatment 2 days after inoculation and were treated 5 times a week and imaged twice a week to monitor tumor growth. At the study endpoint (Day 24), mice were euthanized, and brains were collected for ex vivo analyses. (B) Weekly average metastatic burden per group throughout the study, assessed by BLI (bottom), and representative BLI images from Day 25(top), vehicle N = 9 and Pralsetinib N = 10. (C) Representative BLI images of ex vivo brain (top). Quantification of ex vivo BLI of brains (bottom). (D) Circulating ALT levels between treatment groups. (E) The average weight of mice throughout the study. (F) IHC staining of p-RET (Y905) and Ki-67 expression levels in brain tumors (left) (scale bar = 100µm), and H-score quantification of p-RET (Y905) positivity and Ki-67 positivity (right). (G) Fluorescent TUNEL assay on mouse brain tumors. Images of representative fields show nuclei from control and treated tumors (left) (scale bar = 100µm). Two-way ANOVAs were used to calculate p-values with a mixed-effects analysis for panels (B and E). An unpaired, two-tailed t-test was used in panels (C, D, F and G).

    Journal: bioRxiv

    Article Title: RET Receptor Tyrosine Kinase Promotes Breast Cancer Metastasis to the Brain and RET Inhibitors Pralsetinib and Selpercatinib Suppress Breast Cancer Brain Metastases

    doi: 10.1101/2025.10.07.680986

    Figure Lengend Snippet: Systemic administration of pralsetinib selectively reduces established brain metastatic tumor growth and proliferation in vivo . (A) Schematic of intracranial inoculation mouse model. 6–7-week-old athymic nude mice (N=10/group) were inoculated with luciferase-expressing MDA-MB-231-BrM cells. Mice received their first treatment 2 days after inoculation and were treated 5 times a week and imaged twice a week to monitor tumor growth. At the study endpoint (Day 24), mice were euthanized, and brains were collected for ex vivo analyses. (B) Weekly average metastatic burden per group throughout the study, assessed by BLI (bottom), and representative BLI images from Day 25(top), vehicle N = 9 and Pralsetinib N = 10. (C) Representative BLI images of ex vivo brain (top). Quantification of ex vivo BLI of brains (bottom). (D) Circulating ALT levels between treatment groups. (E) The average weight of mice throughout the study. (F) IHC staining of p-RET (Y905) and Ki-67 expression levels in brain tumors (left) (scale bar = 100µm), and H-score quantification of p-RET (Y905) positivity and Ki-67 positivity (right). (G) Fluorescent TUNEL assay on mouse brain tumors. Images of representative fields show nuclei from control and treated tumors (left) (scale bar = 100µm). Two-way ANOVAs were used to calculate p-values with a mixed-effects analysis for panels (B and E). An unpaired, two-tailed t-test was used in panels (C, D, F and G).

    Article Snippet: The following antibodies were used: p-RET (Y905) (CST 3221s, 1:500); p-AKT (5473) (CST 9271s, 1:1000); p-ERK (T202/Y204) (CST 91015, 1:1000); p-STAT3 (CST 9131L, 1:1000); Vinculin (CST 13901s, 1:5000); RET (CST 3220s, 1:500); RET (CST 3223s, 1:1000); AKT (CST 9272s, 1:1000); ERK (CST 4695s, 1:1000); STAT3 (CST 9139, 1:1000); β-actin (CST 3700s, 1:5000); α-tubulin (Sigma-Aldrich T6074, 1:5000–10,000).

    Techniques: In Vivo, Luciferase, Expressing, Ex Vivo, Immunohistochemistry, TUNEL Assay, Control, Two Tailed Test

    Journal: Cell

    Article Title: Kinase-mediated RAS signaling via membraneless cytoplasmic protein granules

    doi: 10.1016/j.cell.2021.03.031

    Figure Lengend Snippet:

    Article Snippet: Antibodies against the following were obtained from Cell Signaling Technology (Danvers, MA, USA) and were used at a dilution of 1:1000: ALK (D5F3) (#3633), p-Y1604-ALK (#3341), ERK1/2 (#9107), p-T202/Y204-ERK1/2 D13.14.4e (#4370), DCP1B (#13233), EEA1 (#3288), EGF Receptor (#4267), p-Y1068-EGF Receptor (#3777), MEK1/2 (#9122), p-S221-MEK1/2 (#166F8), RET (#3223), p-Y905-RET (#3221), GFP/YFP (D5.1) (#2956), HA (#3724), SHC1 (#2432), PLCγ1 (#5690), SOS1 (#5890), PIK3R1-p85 (#4257), GAB1 (#3232), IRS1 (#2382), SHP2 (#3397), LC3B (#2775), horseradish peroxidase (HRP)-conjugated anti-mouse (#7076) and HRP-conjugated anti-rabbit (#7074).

    Techniques: Recombinant, Protease Inhibitor, Activation Assay, Western Blot, Membrane, Software