Proteomics

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Quantitative intrinsic auto-cathodoluminescence can resolve spectral signatures of tissue-isolated collagen extracellular matrix


ABSTRACT: By analyzing isolated collagen gel samples, we demonstrated in situ detection of spectrally deconvoluted auto-cathodoluminescence signatures of specific molecular content with precise spatial localization over a maximum field of view of 300 µm. Correlation of the secondary electron and the hyperspectral images proved ~40 nm resolution in the optical channel, obtained due to a short carrier diffusion length, suppressed by fibril dimensions and poor electrical conductivity specific to their organic composition. By correlating spectrally analyzed auto-cathodoluminescence with mass spectroscopy data, we differentiated spectral signatures of two extracellular matrices, namely human fibrin complex and rat tail collagen isolate, and uncovered differences in protein distributions of isolated extracellular matrix networks of heterogeneous populations. Furthermore, we demonstrated that cathodoluminescence can monitor the progress of a human cell-mediated remodeling process, where human collagenous matrix was deposited within a rat collagenous matrix. The revealed change of the heterogeneous biological composition was confirmed by mass spectroscopy.

INSTRUMENT(S): Q Exactive

ORGANISM(S): Rattus Norvegicus (rat) Homo Sapiens (human) Bos Taurus (bovine)

TISSUE(S): Urinary Bladder Smooth Muscle, Skin

SUBMITTER: Hans Mattias Larsson  

LAB HEAD: Hans Mattias Larsson

PROVIDER: PXD012407 | Pride | 2019-02-19

REPOSITORIES: Pride

Dataset's files

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ML_170312_Qex_A01.mzid.gz Mzid
ML_170312_Qex_A01.mzid_ML_170312_Qex_A01.MGF Mzid
ML_170312_Qex_A01.mzid_ML_170312_Qex_A01.pride.mgf.gz Mzid
ML_170312_Qex_A01.raw Raw
ML_170312_Qex_A02.mzid.gz Mzid
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Publications

Quantitative intrinsic auto-cathodoluminescence can resolve spectral signatures of tissue-isolated collagen extracellular matrix.

Zielinski Marcin S MS   Vardar Elif E   Vythilingam Ganesh G   Engelhardt Eva-Maria EM   Hubbell Jeffrey A JA   Frey Peter P   Larsson Hans M HM  

Communications biology 20190218


By analyzing isolated collagen gel samples, we demonstrated in situ detection of spectrally deconvoluted auto-cathodoluminescence signatures of specific molecular content with precise spatial localization over a maximum field of view of 300 µm. Correlation of the secondary electron and the hyperspectral images proved ~40 nm resolution in the optical channel, obtained due to a short carrier diffusion length, suppressed by fibril dimensions and poor electrical conductivity specific to their organi  ...[more]

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