Ultrastructural Study of Neurosecretory Cells in the Nervous System in the Cestode (Taenia hydatigena)

Liu, Bo; Wakuri, Hidekazu; Mutoh, Ken-ichiro; Taniguchi, Kazumi

doi:10.2535/ofaj1936.73.4_195

Cited by 4 publications

(1 citation statement)

References 24 publications

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“…The question arises as to whether the cup-shaped free terminals serve as sensory dendrites or are involved in neurosecretion of manipulative molecules into host tissues. Two NN populations have been observed in the scolex in various cestode species, one being associated with CNS and the other, with PNS [8,[14][15][16][17][18]. Our study showed that, in the five cestode species examined, PNS-associated NNs have processes that release secretory material via a paracrine mechanism into the intercellular space near muscle cell membranes, frontal gland cells, and the tegument and on the tegumental surface into host tissues.…”

Section: Experimental Study Of Secretorymentioning

confidence: 54%

New Gland Type Discovered in Cestodes: Neurosecretory Neurons Release a Secret into the Fish Host

Biserova,

Kutyrev,

Malakhov

2023

Dokl Biol Sci

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Abstract—Free endings of peripheral neurosecretory neurons (NNs) were found in the tegument of plerocercoids of five species of parasitic cestodes of fish in an ultrastructural study. The free terminals secreted vesicles on the tegument surface and into the host body. Secretion was experimentally shown to increase in response to the host fish blood serum. In the cestode body, NNs form paracrine-type contacts near the cell membranes of the frontal glands, the tegument, and muscles, functioning as endocrine glands. Simultaneously, NNs function as exocrine glands and secrete the so-called manipulative factors, which influence the physiology of the host.

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Section: Experimental Study Of Secretorymentioning

confidence: 54%

New Gland Type Discovered in Cestodes: Neurosecretory Neurons Release a Secret into the Fish Host

Biserova,

Kutyrev,

Malakhov

2023

Dokl Biol Sci

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Complex Brain Morphology Discovered in the Shark Parasite Nybelinia surmenicola (Cestoda: Trypanorhyncha)

Biserova,

Margarit

2024

Journal of Morphology

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The ultrastructure of the nervous system has been studied in sexually mature Nybelinia surmenicola (Cestoda: Trypanorhyncha) from the intestine of a shark Lamna ditropis. The central nervous system (CNS) reveals a complex organization within cestodes and corresponds to the trypanorhynch pattern of brain architecture. The brain of N. surmenicola is differentiated into nine clearly defined lobes and semicircular, median, and X‐shaped cruciate commissures. A specific feature is the presence of a powerful extracellular capsule that surrounds the brain lobes with the cortical glial cells. Moreover, the architecture of the anterior lobes clearly distinguishes the species of Tentacularioidea. The neurons of the anterior lobes form compact groups looking like frontal horns. There are approximately 120 neurons in the anterior lobes and a preliminary estimate of more than 300 perikarya in the brain. Several ultrastructural types of neurons have been identified, differing in the size and shape of the soma, the density of the cytoplasm, and the ultrastructure of synaptic vesicles. Numerous synapses involving clear and electron‐dense vesicles have been observed in neuropils. Two types of glial cells have been found in the brain that participate in neuronal metabolism and wrap around the giant axons, brain lobes, neuropil compartments, and the main nerve cords. Such a powerful extracellular fibrillar brain capsule has not been observed in the brain of other studied cestodes and has been demonstrated in this study for the first time. The differentiation of the brain lobes reveals the important role of the rhyncheal system in the evolution of cestodes and correlates with their behavior. The anterior nerves arising from the anterior lobes innervate the radial muscles stabilizing the position of the tentacle sheaths and movements of the attachment organs. The nervous system anatomy and the brain architecture may reflect the morphofunctional aspects of the tapeworm evolution.

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The neuro-exocrine secretion: A new type of gland in tapeworms?

Biserova,

Kutyrev,

Saitov

et al. 2023

Zoology

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Ultrastructural Study of Neurosecretory Cells in the Nervous System in the Cestode (Taenia hydatigena)

Cited by 4 publications

References 24 publications

New Gland Type Discovered in Cestodes: Neurosecretory Neurons Release a Secret into the Fish Host

New Gland Type Discovered in Cestodes: Neurosecretory Neurons Release a Secret into the Fish Host

Complex Brain Morphology Discovered in the Shark Parasite Nybelinia surmenicola (Cestoda: Trypanorhyncha)

The neuro-exocrine secretion: A new type of gland in tapeworms?

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