Rosenthal fiber

A Rosenthal fiber is a thick, elongated, worm-like or "corkscrew" eosinophilic (pink) bundle that is found on staining of brain tissue in the presence of long-standing gliosis, occasional tumors, and some metabolic disorders.

Rosenthal fibers.
H&E staining showing these elongated eosinophilic structures in a case of pilocytic astrocytoma. Magnification 400x

Associated conditions

Its presence is associated with either pilocytic astrocytoma[1] (more common) or Alexander's disease (a rare leukodystrophy). They are also seen in the context of fucosidosis.

Pilocytic astrocytoma is the most common primitive tumor found in pediatrics.

Composition

The fibers are found in astrocytic processes and are thought to be clumped intermediate filament proteins, primarily glial fibrillary acidic protein.[2] Other reported constituents include alphaB crystallin, heat shock protein 27, protein beta-1), ubiquitin, vimentin, plectin, c-Jun, the 20 S proteasome, and synemin.[3]

References
  1. Wippold FJ, Perry A, Lennerz J (May 2006). "Neuropathology for the neuroradiologist: Rosenthal fibers". AJNR Am J Neuroradiol. 27 (5): 958–61. PMID 16687524.
  2. Tanaka KF, Ochi N, Hayashi T, Ikeda E, Ikenaka K (October 2006). "Fluoro-Jade: new fluorescent marker of Rosenthal fibers". Neurosci. Lett. 407 (2): 127–30. doi:10.1016/j.neulet.2006.08.014. PMID 16949206.
  3. Heaven, MR; Flint, D; Randall, SM; et al. (1 July 2016). "Composition of Rosenthal Fibers, the Protein Aggregate Hallmark of Alexander Disease". Journal of proteome research. 15 (7): 2265–82. doi:10.1021/acs.jproteome.6b00316. PMC 5036859. PMID 27193225.


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