Light and electron microscopic observations on the organization of skin and associated glands of two caecilian amphibians from Western Ghats of India

Arun, Damodaran; Saroja, B.; Kotharambath, Ramachandran; Abdul-Kader, A.M.; Oommen, Oommen V.; Divya, Lekha

doi:10.1016/j.micron.2018.01.004

Cited by 6 publications

(19 citation statements)

References 25 publications

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“…cf. oxyurus (Arun et al, 2018). We could not differentiate between the GOs of mucous glands and granular glands until now, and this will be taken up in our future studies.…”

Section: Discussionmentioning

confidence: 92%

“…Dermal scales present along with skin glands have been reported in most of the caecilians species (Arun et al, 2018). The scales are located only toward posterior regions of G. ramaswamii.…”

Section: Discussionmentioning

confidence: 97%

“…Granular gland secretory material, on the other hand, is rich in bioactive substances such as peptides, amines, and alkaloids (Erspamer, 1994). The investigation on the organization of caecilian dermal glands has been described since 18th century onwards (Arun et al, 2018;Fox, 1983;Jared et al, 2018;Ochotorena, 1932;Phisalix, 1910;Sarasin & Sarasin, 1887;Welsch & Storch, 1973). We report the dermal glands and scales of G. ramaswamii and also examine the role of the skin secretions in this paper.…”

Section: Discussionmentioning

confidence: 99%

“…Lauriano et al (2016) investigated the immunohistochemistry and the evolutionary aspects of the cutaneous glands of Typhlonectes natans, a South American caecilian species. Arun et al (2018) reported the ultrastructural organization of the cutaneous glands of Ichthyophis tricolor and Uraeotyphlus cf. oxyurus.…”

mentioning

confidence: 99%

“…Herpele (Arun et al, 2018;Casey & Lawson, 1979;Perret, 1982;Wake & Nygren, 1987;Zylberberg, Castanet, & de Ricqles, 1980). Earlier, Phisalix (1910Phisalix ( , 1912 and Marcus (1934) described the dermal scales of diverse caecilian species.…”

mentioning

confidence: 99%

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Light and transmission electron microscopic structure of skin glands and dermal scales of a caecilian amphibian Gegeneophis ramaswamii, with a note on antimicrobial property of skin gland secretion

Arun

Akbarsha

Oommen

et al. 2019

Microscopy Res & Technique

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Amphibian skin secretions contain a variety of bioactive compounds that are involved in diverse roles such as communication, homeostasis, defence against predators, pathogens, and so on. Especially, the caecilian amphibians possess numerous cutaneous glands that produce the secretory material, which facilitate survival in their harsh subterranean environment. Inspite of the fact that India has a fairly abundant distribution of caecilian amphibians, there has hardly been any study on their skin and its secretion. Herein, we describe, using light microscopy and electron microscopy, two types of dermal glands, mucous and granular, in Gegeneophis ramaswamii. The mucous glands are filled with mucous materials. The mucous‐producing cells are located near the periphery. The granular glands are surrounded by myoepithelial cells. A large number of granules of different sizes are present in the lumen of the granular gland. The granule‐producing cells are present near the myoepithelial lining of the gland. There are small flat disk‐like dermal scales in pockets in the transverse ridges of the posterior region of the body. Each pocket contains 1–4 scales of various sizes. Scanning electron microscopic (SEM) study of the skin surface showed numerous funnel‐shaped glandular openings. The antibacterial activity of the skin secretions was revealed in the test against Escherichia coli, Klebsiella pneumoniae, and Aeromonas hydrophila, all gram‐negative bacteria. SEM analyses confirm the membrane damage in bacterial cells on exposure to skin secretions of G. ramaswamii.

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“…cf. oxyurus (Arun et al, 2018). We could not differentiate between the GOs of mucous glands and granular glands until now, and this will be taken up in our future studies.…”

Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 97%