Pineal organ-like organization of the retina in megachiroptean bats

Zs Fejér, C. Haldar, M. Ghosh, L. Cs Frank, Zs Szepessy, A. Szél, M. J. Manzano E Silva, B. Vígh

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Phylogenetically originated from photoreceptive structures, the pineal organ adapts the organism to circadian and circannual light periodicity of the environment, while the retina develops to a light-based locator. Bats have a nocturnal life and an echolocator orientation presumably modifying the task of photoreception. Looking for morphological basis of the special functions, in the present work we compared the fine structure and immunocytochemistry of the retina and pineal organ in micro- and megacrochiroptean bats. We found that there is a high similarity between the retina and pineal organ in megachiropterans when compared to other species investigated so far. Besides of photoreceptor derived pinealocytes, the pineal organ of both micro- and megachiropterans contain intrapineal neurons and/or ganglionic cells as well as glial cells. Like spherules and pedicles of retinal photoreceptors, axon-type processes of pinealocytes form synaptic ribbon containig terminals. Similar to retinal photoreceptors and neurons, pinealocytes and pineal neurons contain immunoreactive glutamate and aspartate. In addition, excitatory amino acids accumulate in the pineal neurohormonal endings and might have a role in the hormonal (serotonin?) release of the organ. Concerning the structure of the retina the highest similarity to the organization of the pineal organ was found in the megachiroptean fruit eating bats Cynopterus sphinx and Rusettus niloticus. The retina of these species forms folds and crypts in its photoreceptor layer. This organization is similar to the folds of the pineal wall successively developed during evolution. Since a folded photoreceptor layer is not viable for a photolocator screen in decoding two-dimensional images, we suppose that this peculiar organization of the megachiropteran retina is connected to a "pineal-like" photometer task of the eye needed by these species active at night.

Original languageEnglish
Pages (from-to)17-27
Number of pages11
JournalActa Biologica Hungarica
Volume52
Issue number1
DOIs
Publication statusPublished - 2001

Fingerprint

bat
retina
Neurons
Chiroptera
Retina
photoreceptors
Photometers
Vertebrate Photoreceptor Cells
Excitatory Amino Acids
neurons
Fruits
Aspartic Acid
Decoding
Glutamic Acid
Serotonin
photoreception
Cynopterus
Sphinx
photometers
fold

Keywords

  • Electron microscopy-chiropterans
  • Excitatory amino acids
  • Immunoreaction
  • Pineal organ
  • Retina

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)

Cite this

Pineal organ-like organization of the retina in megachiroptean bats. / Fejér, Zs; Haldar, C.; Ghosh, M.; Frank, L. Cs; Szepessy, Zs; Szél, A.; Manzano E Silva, M. J.; Vígh, B.

In: Acta Biologica Hungarica, Vol. 52, No. 1, 2001, p. 17-27.

Research output: Contribution to journalArticle

Fejér, Z, Haldar, C, Ghosh, M, Frank, LC, Szepessy, Z, Szél, A, Manzano E Silva, MJ & Vígh, B 2001, 'Pineal organ-like organization of the retina in megachiroptean bats', Acta Biologica Hungarica, vol. 52, no. 1, pp. 17-27. https://doi.org/10.1556/ABiol.52.2001.1.3
Fejér, Zs ; Haldar, C. ; Ghosh, M. ; Frank, L. Cs ; Szepessy, Zs ; Szél, A. ; Manzano E Silva, M. J. ; Vígh, B. / Pineal organ-like organization of the retina in megachiroptean bats. In: Acta Biologica Hungarica. 2001 ; Vol. 52, No. 1. pp. 17-27.
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