ArticleAdvanced science (Weinheim, Baden-Wurttemberg, Germany)2026
Super-Multiplexed Label-Free Raman Imaging Uncovers Novel Testicular Metabolic Couplings for Residual Body and Spermatogonial Differentiation.
Article in Advanced science (Weinheim, Baden-Wurttemberg, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The biochemical composition underlying cytoplasmic residual body (RB) and arrested spermatogonia remains unresolved in spermatogenesis, in part due to limited approaches for intact-tissue metabolic interrogation. Here we develop Super-multiplexed Label-free Raman Imaging (SLRI) to generate 2D/3D biochemical maps of intact Drosophila testes. SLRI delineates major testicular cell types and provides the first in situ, stage-resolved mapping of cytoplasmic RBs at two discrete phases. We further identify a differentiation-arrest-associated metabolic trajectory in spermatogonial clusters, characterized by coordinated spatiotemporal decay of specific biochemical species. Across 42 spatiotemporally variant metabolites and metabolic pathways, SLRI reveals RB- and arrest-enriched signatures. Notably, RBs and arrested spermatogonia display significant biochemical overlap, alongside unique spectral signatures. Furthermore, we uncovered a ring-like, punctate arrangement of lipids, amino acids, and vitamins encircling RBs, suggesting structured metabolite partitioning during cytoplasmic remodeling. Collectively, SLRI establishes a general framework for high-dimensional metabolic mapping and remodeling analysis in intact tissues.
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