使用ToF-SIMS和多实例学习揭示乳腺癌中BMP4表达的空间分子指纹
Wil Gardner1, Judy Borg2, Kellie A Mouchemore2,3
1Centre for Materials and Surface Science and Department of Mathematical and Physical Sciences, La Trobe University, Bundoora, Victoria 3086, Australia.
Analytical chemistry
|February 26, 2026
概括
我们开发了一种新的机器学习方法来分析来自三阴性乳腺癌瘤的高光谱成像数据. 这种方法成功地确定了关键的空间分子差异,有助于癌症亚型和转移预测.
科学领域:
- 材料科学 材料科学 材料科学
- 生物医学工程 生物医学工程
- 计算生物学 计算生物学
背景情况:
- 超光谱成像和机器学习正在推进材料表征.
- 分析大型超频谱数据集以找到人口层面的空间分子差异仍然具有挑战性.
- 区分类似材料,如特定的癌症亚型,需要复杂的分析方法.
研究的目的:
- 应用质谱成像和一种新的弱监督学习方法来区分两个类似的三阴性乳腺癌 (TNBC) 组.
- 根据骨形态遗传蛋白4 (BMP4) 表达来识别区分TNBC瘤的空间分子特征.
- 为医学应用展示空间光谱表征的潜力.
主要方法:
- 使用质谱成像 (MSI) 结合新的弱监督学习算法,稳定性选择增强多个实例学习 (SSAMIL).
- SSAMIL的设计是为了在大型数据集中识别可概括的,人口级的空间分子差异.
- 采用高侧面分辨率延迟提取成像用于详细的空间分析.
主要成果:
- SSAMIL 方法准确地区分了两个TNBC集,准确度为92%.
- 成功地确定了特定的空间区域和一组稀疏的分子特征,这对于分类至关重要.
- 通过专家病理学验证了发现,并确定了一种预测转移的新生物标志物.
结论:
- 开发的SSAMIL方法有效地区分了高度相似的材料,特别是TNBC亚型.
- 已识别的空间分子签名对于准确的分类至关重要,并有可能用于生物标志物发现.
- 这项研究强调了综合超光谱成像和先进机器学习在材料表征和医学诊断方面的巨大潜力.
相关概念视频
03:08Hydroboration-Oxidation of Alkenes
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
02:15Preparation of Alcohols via Addition Reactions
Overview
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
02:35Acid-Catalyzed Dehydration of Alcohols to Alkenes
In a dehydration reaction, a hydroxyl group in an alcohol is eliminated along with the hydrogen from an adjacent carbon. Here, the products are an alkene and a molecule of water. Dehydration of alcohols is generally achieved by heating in the presence of an acid catalyst. While the dehydration of primary alcohols requires high temperatures and acid concentrations, secondary and tertiary alcohols can lose a water molecule under relatively mild conditions.
02:37Oxidation of Alcohols
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
01:33Preparation of Aldehydes and Ketones from Alcohols, Alkenes, and Alkynes
Aldehydes and ketones are prepared from alcohols, alkenes, and alkynes via different reaction pathways. Alcohols are the most commonly used substrates for synthesizing aldehydes and ketones. The conversion of alcohol to aldehyde, which involves the oxidation process, depends on the class of the alcohol used and the strength of the oxidizing agent. For instance, primary alcohol will form an aldehyde when treated with a weak oxidizing agent; however, it gets over-oxidized to a carboxylic acid in...
01:22Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation
Baeyer–Villiger oxidation converts aldehydes to carboxylic acids and ketones to esters. The reaction uses peroxy acids or peracids and is often catalyzed by acid. The reaction is named after its pioneers, Adolf von Baeyer and Victor Villiger. The reaction is achieved by a wide range of peracids such as m-chloroperoxybenzoic acid (mCPBA), perbenzoic acid (C6H5COOOH), peracetic acid (CH3COOOH), hydrogen peroxide (H2O2), and tert-butyl hydroperoxide (t-BuOOH).
The carbonyl center is activated by...
The carbonyl center is activated by...