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Nanonets Collect Cancer Secretome from Pericellular Space.

ABSTRACT: Identifying novel cancer biomarkers is important for early cancer detection as it can reduce mortality rates. The cancer secretome, the collection of all macromolecules secreted by a tumor cell, alters its composition compared to normal tissue, and this change plays an important role in the observation of cancer progression. The collection and accurate analysis of cancer secretomes could lead to the discovery of novel biomarkers, thus improving outcomes of cancer treatment. We unexpectedly discovered that enzyme-instructed self-assembly (EISA) of a D-peptide hydrogelator results in nanonets/hydrogel around cancer cells that overexpress ectophosphatases. Here we show that these nanonets are able to rapidly collect proteins in the pericellular space (i.e., near the surface) of cancer cells. Because the secretory substances are at their highest concentration near the cell surface, the use of pericellular nanonets to collect the cancer secretome maximizes the yield and quality of samples, reduces pre-analytical variations, and allows the dynamic profiling of secretome samples. Thus, this new approach has great potential in identifying the heterotypic signaling in tumor microenvironments thereby improving the understanding of tumor microenvironments and accelerating the discovery of potential biomarkers in cancer biology. Data are available via ProteomeXchange with identifier PXD003924.

SUBMITTER: Zhou R

PROVIDER: S-EPMC4839576 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature

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Nanonets Collect Cancer Secretome from Pericellular Space.

Zhou Rong R Kuang Yi Y Zhou Jie J Du Xuewen X Li Jie J Shi Junfeng J Haburcak Richard R Xu Bing B

PloS one 20160421 4

Identifying novel cancer biomarkers is important for early cancer detection as it can reduce mortality rates. The cancer secretome, the collection of all macromolecules secreted by a tumor cell, alters its composition compared to normal tissue, and this change plays an important role in the observation of cancer progression. The collection and accurate analysis of cancer secretomes could lead to the discovery of novel biomarkers, thus improving outcomes of cancer treatment. We unexpectedly disco ...[more]

PMID: 27100780

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Project description:BackgroundThe richness of patients? experiences warrants thoughtful and careful examination. While standardized surveys or other structured approaches can be useful when the goal is to count or summarize relatively uncomplicated experiences, they may be less appropriate when the objective is to study sensitive topics, such as medical errors during cancer care. This abstract describes and evaluates a flexible, patient-centered approach to interviewing patients.MethodsUsing a patient-centered telephone interview guide, we interviewed cancer patients who had experienced a problem during their care. Participants were first asked to fully describe their experience; follow-up questions probed for details relevant to the study questions. Question order varied, consistent with a conversational approach. Interviews lasted 60?90 minutes and were digitally recorded. We calculated the percentage of words uttered by participants (compared to the interviewer) as a measure of participant engagement, and noted whether participants corrected the interviewer. Strengths and limitations of this approach are also identified.ResultsSeventy-eight patients were interviewed; 96% (75/78) were female, mean age was 57.7 [SD 10.6]. Overall, participants uttered an average of 77% (6,190/8,001) of the words in the interview. Participants corrected the interviewer at least once in 80% (62/78) of the interviews. Question order was flexible, and probes were used at the discretion of the interviewer. Thus, the interviewer could adapt her questioning to follow the participant?s lead, and sensitively encourage and support participants in sharing details of painful experiences. One benefit of this technique was that it allowed the interviewer to convey interest and respect, which enhanced rapport early in the interview. It also enabled participants to recall details that may otherwise have been forgotten. The drawbacks of this approach include longer interview times; discussion of unrelated topics (by participants) and increased time required for data analyses.ConclusionsPatient-centered conversational interviewing can facilitate investigation of emotionally-charged, personal experiences. This approach appears more effective than standardized interviewing techniques when the goal is to fully understand patients? experiences, such as those of cancer survivors who believe that an error occurred during their cancer care.

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Nanonets Collect Cancer Secretome from Pericellular Space.

Publications

Nanonets Collect Cancer Secretome from Pericellular Space.

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