Structure of the secretory cells of male and female adult guinea pigs Harderian gland

Hussein, Omar; Elgamal, Dalia A.; Elgayar, Sanaa A M

doi:10.1016/j.tice.2015.04.006

Cited by 10 publications

(11 citation statements)

References 49 publications

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“…The present findings suggest that secretion in serous toxin cells is merocrine during resting, as seen in similar vertebrate cells (Hussein et al. ). Nonetheless, when the worm makes contact with prey, apocrine secretion is set in motion, caused by changes in internal cell pressure, which enables faster release of highly concentrated products ( cf .…”

Section: Discussionsupporting

confidence: 81%

“…The coexistence of both apocrine and merocrine secretion has already been reported to occur in gland cells of higher order vertebrates, from eyes to reproductive organs (Groos et al 1999;Hussein et al 2015). Rather than shifts in osmotic pressure, as proposed by Michel (1969), apocrine secretion in serous cells of the proboscis is triggered by a combination of: (i) mechanical pressure exerted by contact with prey; (ii) increased hydrostatic pressure within the proboscis; and (iii) contraction of adjacent musculature (e.g.…”

Section: Discussionmentioning

confidence: 95%

“…; Hussein et al. ). Rather than shifts in osmotic pressure, as proposed by Michel (), apocrine secretion in serous cells of the proboscis is triggered by a combination of: (i) mechanical pressure exerted by contact with prey; (ii) increased hydrostatic pressure within the proboscis; and (iii) contraction of adjacent musculature (e.g.…”

Section: Discussionmentioning

confidence: 98%

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A morphoanatomical approach to the adaptive features of the epidermis and proboscis of a marine Polychaeta: Eulalia viridis (Phyllodocida: Phyllodocidae)

et al. 2018

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Eulalia viridis is a marine Polychaeta of the rocky intertidal that, despite its simple anatomy, is an active predator of much larger invertebrates, from which it extracts pieces of soft tissue through suction. This uncanny feeding strategy triggered the pursuit for the morphological mechanisms that enable adaptation to its environment. The evaluation of the worm anatomy and microanatomy, combining electron and optical microscopy, revealed a series of particular adaptations in the epidermis and in the proboscis (the heavily muscled eversible pharynx). Besides its function in feeding, the proboscis is the main sensory organ, being equipped with numerous sensorial papillae holding chemoreceptors. Additionally, the proboscis possesses tentacles that become exposed when the organ is everted. These provide fast release of mucus and toxins, from mucocytes and special serous cells, respectively (the latter involving both merocrine and apocrine processes), whenever contact with a prey occurs. In its turn, the epidermis provides protection by cuticle and mucus secretion and has a sensorial function that may be associated to the worm's uncommon green pigment cells. Eulalia viridis presents a series of elegant adaptive tools to cope with its environment that are evolutionarily designed to counterbalance its relatively simple body plan.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 95%

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A morphoanatomical approach to the adaptive features of the epidermis and proboscis of a marine Polychaeta: Eulalia viridis (Phyllodocida: Phyllodocidae)

et al. 2018

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“…They noted lipid granules in the cytoplasm of epithelial cells of the acini and tubules of Harderian gland. Similarly in agreement with the observations of present study, Hussein et al (2015) in guinea pig observed Sudan black positive activity in the intracellular cytoplasmic vacuoles and luminal secretion of Harderian gland.…”

Section: Lipidsupporting

confidence: 94%

Histochemical changes during development of Harderian gland in chicken

Rana¹,

Banubakode²,

Nandeshwar³

et al. 2019

IJAR

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The present study was aimed to examine histochemical changes in the Harderian gland of pre and post hatched chicks from 11 day of incubation to 24 days of age. In pre hatched groups, the gland was in the developing stage. There was no well defined parenchyma, septa and capsule in early embryonic stage. Histochemical observation revealed that weak or negligible activity of PAS, AB/PAS and Sudan black B was seen in epithelial lining of Harderian gland on 18th and 20th day of incubation. The gland was compound tubule-acinar type at 20th day of incubation, consisted of capsule, parenchyma and stroma. PAS activity was seen in the capsule, septa, epithelial lining of acini and tubule and interstitial connective tissue cells. PAS activity was aggregated towards the apical part of the tubular epithelium as well as at the free luminal surface epithelium of the acini. PAS activity increases with the development of connective tissue component of Harderian gland with the advancement of age. The Harderian gland was predominantly mucus and lipid secreting gland. All epithelial cells of the glandular unit of Harderian gland contain both neutral and acidic mucin. Intense AB-positive activity was seen at the apex of tubule with the advancement of age. Sudan black B activity was recorded in the cytoplasm of epithelial lining of tubule and acini of the Harderian gland and their presence increases with age.

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“…Furthermore, studies on other species have shown sexual dimorphism in the HG (McCafferty and Pinkstaff, 1970, Buzzell, 1996, Hussein et al, 2015 probably resulting in TS differences between males and females. Studies on the pig have found differences between left and right eye TS with left eye TS relating more to the assumed stressors (Marchant-Forde and Marchant-Forde, 2014, DeBoer et al, 2015, Telkänranta et al, 2016.…”

Section: Introductionmentioning

confidence: 99%

Tear staining in finisher pigs and its relation to age, growth, sex and potential pen level stressors

Larsen

Gustafsson

Marchant‐Forde

et al. 2019

animal

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Tear staining (TS) in the pig has been related to different stressors and may be a useful tool for assessing animal welfare on farm. The aim of the current study was to investigate TS across the finisher period and its possible relation to age, growth, sex and experimentally induced stressors. The study included 80 finisher pens divided between three batches. Within each batch, the pens either included pigs with docked or undocked tails, had straw provided (150 g/pig/day) or not and had a low (1.21 m2/pig, 11 pigs) or high stocking density (0.73 m2/pig, 18 pigs). Tear staining (scores 1 to 4; from smaller to larger tear stain area, respectively) and tail damage were scored on each individual pig three times per week over the 9-week study period, and the individual maximum TS score within each week was chosen for further analysis. Data were analysed using logistic regression separately for each of the four possible TS score levels. The TS scores 1 and 2 decreased with weeks into the study period and were negatively related to the average daily gain (ADG) of the pigs, whereas the TS score 4 increased with weeks into the study period and was positively related to ADG. None of the TS scores differed between females and castrated males, and neither straw provision nor lowering the stocking density affected the TS scores. However, the TS score 1 decreased the last week before an event of tail damage (at least one pig in the pen with a bleeding tail wound), whereas the TS score 4 increased. The results of the current study advocates for a relation between TS and the factors such as age, growth and stress in the pig, while no relation was found between TS and the environmental factors straw provision and lowered stocking density. The relations to age and growth are important to take into consideration if using TS as a welfare assessment measure in the pig in the future.

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Structure of the secretory cells of male and female adult guinea pigs Harderian gland

Cited by 10 publications

References 49 publications

A morphoanatomical approach to the adaptive features of the epidermis and proboscis of a marine Polychaeta: Eulalia viridis (Phyllodocida: Phyllodocidae)

A morphoanatomical approach to the adaptive features of the epidermis and proboscis of a marine Polychaeta: Eulalia viridis (Phyllodocida: Phyllodocidae)

Histochemical changes during development of Harderian gland in chicken

Tear staining in finisher pigs and its relation to age, growth, sex and potential pen level stressors

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