Basophilia, acidophilia and argyrophilia of "dark" (compacted) neurons during their formation, recovery or death in an otherwise undamaged environment.
By means of a condenser discharge electric shock paradigm, "dark" (compacted) granule neurons were momentarily produced in the hippocampal dentate gyri of rats, which were sacrificed either immediately or following survival periods ranging from 1h to 30 days. Except for the morphological changes related to the formation, recovery or death of the "dark" neurons, the affected brain areas remained undamaged. Vibratome, frozen, cryostat and paraffin sections were stained with Mayer's hematoxylin, acid fuchsin, or Fluoro-Jade and by three silver methods widely used for the demonstration of damaged neurons; with or without previous removal of nucleic acids, partial digestion of proteins or blockade of the negatively charged side-groups of nucleic acids and proteins. The results allowed the following conclusions: (i) "Dark" neurons acquire argyrophilia and excess basophilia simultaneously with their momentary formation. (ii) Negatively charged protein molecules are responsible for these processes. (iii) From the recovering "dark" neurons, the acquired basophilia and argyrophilia disappear within a few hours post-insult. (iv) From the moribund or dead "dark" neurons, the acquired basophilia disappears in the same period of time while the acquired argyrophilia in a few days. (vi) Freshly-produced or recovering "dark" neurons are slightly acidophilic, whereas the moribund or dead ones display intense acidophilia.
Zsombok
Andrea
A
Department of Neurosurgery, Clinical Neuroscience Research Group of the Hungarian Academy of Sciences, Section of Neuropathology, Faculty of Medicine, Pécs University, Rét utca 2, H-7623 Pécs, Hungary. azsombok@mail1.vcu.edu
Tóth
Zsolt
Z
Gallyas
Ferenc
F
D000818:Animals; D001557:Benzenesulfonates; D016923:Cell Death / Q000502:physiology; D002467:Cell Nucleus / Q000737:chemistry / Q000473:pathology; D003593:Cytoplasm / Q000737:chemistry / Q000473:pathology; D018891:Dentate Gyrus / Q000473:pathology / Q000503:physiopathology; D004558:Electric Stimulation / Q000009:adverse effects / Q000379:methods; D005452:Fluoresceins; D005456:Fluorescent Dyes; D006416:Hematoxylin; D006863:Hydrogen-Ion Concentration; D009336:Necrosis / Q000209:etiology / Q000473:pathology / Q000503:physiopathology; D009410:Nerve Degeneration / Q000209:etiology / Q000473:pathology* / Q000503:physiopathology*; D009474:Neurons / Q000737:chemistry / Q000473:pathology*; D009930:Organic Chemicals; D011506:Proteins / Q000737:chemistry; D051381:Rats; D017208:Rats, Wistar; D020127:Recovery of Function / Q000502:physiology; D016622:Silver Staining; D013194:Staining and Labeling / Q000379:methods*
D001557:Benzenesulfonates; D005452:Fluoresceins; D005456:Fluorescent Dyes; D009930:Organic Chemicals; D011506:Proteins; C435731:fluoro jade; C086337:acid fuchsin; D006416:Hematoxylin