Three-dimensional analysis of neural connectivity with cells in rat ileal mucosa by serial block-face scanning electron microscopy
JOURNAL OF VETERINARY MEDICAL SCIENCE
Authors: Nakanishi, Satoki; Mantani, Youhei; Haruta, Tomohiro; Yokoyama, Toshifumi; Hoshi, Nobuhiko
Abstract
The comprehensive targets of innervation in the intestinal mucosa are unknown, partly because of the diversity of cell types and the complexity of the neural circuits. Herein, we investigated the comprehensive targets of neural connectivity and analyzed the precise characteristics of their contact structures in the mucosa of rat ileum. We examined target cells of neural connections and the characteristics of their contact structures by serial block- face scanning electron microscopy at four portions of the rat ileal mucosa: the apical and basal portions in the villi, and the lateral and basal portions around/in the crypts. Nerve fibers were in contact with several types of fibroblast-like cells (FBLCs), macrophage-like cells, eosinophils, lymphocyte-like cells, and other types of cells. The nerve fibers almost always ran more inside of lamina propria than subepithelial FBLC, and thus contacts with epithelial cells were very scarce. The contact structures of the nerve fibers were usually contained synaptic vesicle-like structures, and we classified them into patterns based on the number of nerve fiber contacting the target cells at one site, the maximum diameter of the contact structures, and the relationship between nerve fibers and nerve bundles. The contact structures for each type of cells occasionally dug into the cellular bodies of the target cells. We revealed the comprehensive targets of neural connectivity based on the characteristics of contact structures, and identified FBLCs, immunocompetent cells, and eosinophils as the candidate targets for innervation in the rat ileal mucosa.
Tracking the Biological Incorporation of Exogenous Molecules into Cellulose Fibers with Non-Radioactive Iodinated Glucose
ISRAEL JOURNAL OF CHEMISTRY
Authors: Natalio, Filipe
Abstract
Semi-synthetic biological fabrication explores biological systems and their biosynthetic pathways as inspiration for designing precursor analogs that can be metabolized in a similar manner as the natural substrates by organisms to yield new materials with tailored properties. Here we report the biological incorporation of a metabolizing iodinated glucose analog (2-Deoxy-2-iodo-D-glucose, DIG) intoGossypium hirsutumcotton fibers in an ovulein-vitromodel. Structural modifications occur at the level of crystallite arrangement and compaction, with amorphization of the fibers and alteration of the H-bond network between the cellulose nanofibrils. We further show that DIG can serve as a non-radioactive micro computed tomography contrast agent (mu CT). The fibers act as glucose sinks that accumulate DIG, enabling its detection by mu CT. Quantitative analysis shows that the fibers are more oriented when incubated with DIG. This work demonstrates the advantages of using higher organisms for biologicalin-situtransformation of economically important raw materials over conventional chemical surface modification processes, thereby providing a scientific foundation for implementing future alternatives and sustainable manufacturing strategies towards a bio-based economy.