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KAT7 modification in response to DNA damage LC-MS/MS analysis

ABSTRACT: To identify the acylation modification site of KAT7 in response to DNA damage, we treated HCT116 cells with etoposide, extracted proteins and purified KAT7 protein with KAT-specific antibodies for mass spectrometry analysis.This mass spectrometry identified the level of acylation modification of KAT7 in response to DNA damage in HCT116 cell line.

INSTRUMENT(S): LTQ Orbitrap Velos Pro, LTQ Orbitrap Elite

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Epithelial Cell

DISEASE(S): Colon Cancer

SUBMITTER: 萌王

LAB HEAD: Yang Yang

PROVIDER: PXD043707 | Pride | 2024-12-12

REPOSITORIES: pride

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			Action	DRS
	20210210-MGQ.msf	Msf
	20210210-MGQ.raw	Raw
	checksum.txt	Txt

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Project description:Short-term fasting protects mice from lethal doses of chemotherapy through undetermined mechanisms. Herein, we demonstrate that fasting preserves small intestinal (SI) architecture by maintaining SI stem cell viability and SI barrier function following exposure to high-dose etoposide. Nearly all SI stem cells were lost in fed mice, whereas fasting promoted sufficient SI stem cell survival to preserve SI integrity after etoposide treatment. Lineage tracing identified multiple SI stem cell populations, marked by Lgr5, Bmi1 or HopX expression, that contributed to fasting-induced survival. DNA repair and DNA damage response genes were elevated in SI stem/progenitor cells of fasted etoposide-treated mice, which importantly correlated with faster resolution of DNA double strand breaks and less apoptosis. Thus, fasting preserved SI stem cell viability as well as SI architecture and barrier function suggesting that fasting may reduce host toxicity in patients undergoing dose intensive chemotherapy. Intestines were harvested 3 h post-etoposide injection, flushed with PBS, and then flushed with ice-cold Methacarn (60% methanol, 30% chloroform, 10% acetic acid) to fix the tissue while preserving RNA integrity. Fixed intestines were rinsed with 70% ethanol, embedded in 2% agar followed by paraffin embedding. Sections were deparrafinized and dehydrated through xylene and an increasing gradient of ethanol. Laser capture microdissection was performed using the Acturus PixCell IIe, with the following settings: spot size power 80, duration 1 ms, repeat 0.2 s, target 0.150 V, current 1.82 mA. RNA was isolated from the CapSure HS LCM Caps (Applied Biosystem) using the PicoPure RNA Isolation kit (Applied Biosystems). All RNA samples were treated with DNaseI (Qiagen). Four biological replicates were used for each of the following treatments: Fasted Etoposide, Fed Etoposide. Each group had 2 male and 2 females samples. 4-6 week old Lgr5EGFP-IRES-CreERT2/+ mice were dosed with 80mg/kg etoposide (i.v.).

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KAT7 modification in response to DNA damage LC-MS/MS analysis

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