Combined Raman and Polarization Sensitive Holographic Imaging for a Multimodal Label-free Assessment of Human Sperm Function

Overview

Journal Sci Rep

Specialty Science

Date 2019 Mar 20

PMID 30886325

Citations 8

Authors

Annalisa De Angelis

Maria Antonietta Ferrara

Gianfranco Coppola

Loredana Di Matteo

Laura Siani

Brian Dale

Giuseppe Coppola

Anna Chiara De Luca

Affiliations

Soon will be listed here.

Abstract

Raman microspectroscopy (RM) and polarization sensitive digital holographic imaging (PSDHI) are valuable analytical tools in biological and medical research, allowing the detection of both biochemical and morphological variations of the sample without labels or long sample preparation. Here, using this multi-modal approach we analyze in vitro human sperm capacitation and the acrosome reaction induced by heparin. The multimodal microscopy provides morphofunctional information that can assess the sperms ability to respond to capacitation stimuli (sperm function). More precisely, the birefringence analysis in sperm cells can be used as an indicator of its structural normality. Indeed, digital holography applied for polarization imaging allows for revelation of the polarization state of the sample, showing a total birefringence of the sperm head in non-reacted spermatozoa, and a birefringence localized in the post-acrosomal region in reacted spermatozoa. Additionally, RM allows the detection and spectroscopic characterization of protein/lipid delocalization in the plasma and acrosomal membranes that can be used as valuable Raman biomarkers of sperm function. Interestingly, these spectral variations can be correlated with different time phases of the cell capacitation response. Although further experimentation is required, the proposed multimodal approach could represent a potential label-free diagnostic tool for use in reproductive medicine and the diagnosis of infertility.

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