Structural and functional characteristics of the special regulatory devices in the peripheral pulmonary circulation in rabbits

Hussein, Marwa M.

doi:10.1007/s00709-019-01459-y

Cited by 5 publications

(13 citation statements)

References 44 publications

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“…The present study demonstrated modified vascular endothelial cells that had a pear-shaped appearance, suggesting their role to perform additional functions. Similar observations were made in the vascular endothelium of the coronary artery of Bactrian camel by En El Camello Bactriano (2016) and in the pulmonary arteries of rabbits (Hussein, 2019). The authors reported that the characteristics of endothelial modification are an adaption to withstand the strong blood flow within the arteries of camels in the dry and hot climate.…”

Section: Discussionsupporting

confidence: 79%

Structural Investigation of Epididymal Microvasculature and Its Relation to Telocytes and Immune Cells in Camel

Hussein

Abdel-Maksoud

2020

Microsc Microanal

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Section: Discussionsupporting

confidence: 79%

Structural Investigation of Epididymal Microvasculature and Its Relation to Telocytes and Immune Cells in Camel

Hussein

Abdel-Maksoud

2020

Microsc Microanal

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“…They were represented by atypical glomus vessels with an intimal glomus bolster and a well-developed internal elastic membrane and a venule presenting a specialized internal elastic membrane with a modified pear-shaped appearance protruded into the vascular lumen were detected. Similar special regulatory devices have been identified in the camel's (Camelus dromedarius) lung (Mohamedien, 2009) and in the rabbit's lung (Hussein, 2020). These specialized vascular devices are proposed to control blood flow and pressure in the peripheral pulmonary circulation, but the exact physiological mechanisms by which they function or controlled are still unknown.…”

Section: T-and B-lymphocytesmentioning

confidence: 76%

“…The peripheral pulmonary circulation, like other organs, has some unique structural devices that are thought to play a significant regulatory role. These particular devices include primarily throttle arteries, atypical glomus vessels, and arteriovenous anastomoses (Mohamedien, 2009;Hussein, 2020).…”

Section: Introductionmentioning

confidence: 99%

Pulmonary Guardians and Special Regulatory Devices in the Lung of Nile Monitor Lizard (Varanus niloticus) with Special Attention to the Communication Between Telocyte, Pericyte, and Immune Cells

Mohamedien

Awad

2021

Microsc Microanal

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Monitor lizards are acclimatized to a variety of environments. Most of the monitor species are terrestrial, although there are arboreal and semiaquatic monitors. Such accommodation requires unique cellular structure and regulatory devices in various organs, particularly their lungs. This study aimed to report the pulmonary guardians and special regulatory devices that may guard and promote the function of the lungs of the Nile monitor lizards (Varanus niloticus). Specially structured vessels were recorded in the pulmonary tissue involving atypical glomus vessels, vessels with variable wall thickness, and a venule with specialized internal elastic membrane. Moreover, numerous lung resident guardians could be identified including both alveolar and interstitial macrophages, dendritic cells, mast cells, and B- and T-lymphocytes. Pericytes were demonstrated surrounding the capillary endothelium with a characteristic direct hetero-cellular junction with telocytes. Telocytes established a microenvironment through an indirect hetero-cellular junction with the interstitial macrophage, dendritic cells, and pneumocyte type II. Collectively, these data indicate a significant role played by the specially structured vessels and the resident immune cells in guarding the pulmonary tissue of the Nile monitor lizards and promoting its function. Telocytes are suggested to play a key role in angiogenesis and cellular communication to promote the function of the immune cells.

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“…The pulmonary circulation is a high-capacitance, low-pressure system with a wide surface area for gas exchange. The bronchial circulation, on the other hand, is a high-pressure, low-capacitance system that supplies oxygen and nutrients to the pulmonary tissue (Townsley, 2013; Hussein, 2020).…”

Section: Introductionmentioning

confidence: 99%

Mapping the Distribution of Special Structured Pulmonary Vasculatures in the Dromedary Camel (Camelus dromedarius): Histological and Histochemical Study

et al. 2022

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Dromedary camel (Camelus dromedarius) is adapted to survive the harsh environments. It has some key adaptation peculiarities in various organs. In this study, we aimed to map the distribution pattern of unique regulatory devices along the course of the pulmonary vessels using histological and histochemical analyses. Arteries with variable wall thickness and spirally oriented course were recorded within the adventitia of the main pulmonary artery. Throttle arteries and glomus bolsters were found within the wall of the lobar pulmonary artery. The bronchial artery was located within the wall of all bronchi reaching the subsegmental branches and it had elastic longitudinal muscular intima bolsters. Arteries with double muscular media were demonstrated in the pulmonary pleura. These bolsters are suggested to play a complicated role that allows for hemodynamic, humeral, and thermoregulatory activities. The lumen of some subsegmental pulmonary veins revealed occasional constrictions arising from the corresponding muscular pad-like protrusions of the tunica media. These veins may possess occlusive or constrictive mechanisms and their obstruction induces engorgement of the associated capillary bed in addition to restricting venous outflow. Collectively, these data strongly recommend a crucial role for the special regulatory devices in preserving the camel pulmonary function in the harsh desert environment.

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Structural and functional characteristics of the special regulatory devices in the peripheral pulmonary circulation in rabbits

Cited by 5 publications

References 44 publications

Structural Investigation of Epididymal Microvasculature and Its Relation to Telocytes and Immune Cells in Camel

Structural Investigation of Epididymal Microvasculature and Its Relation to Telocytes and Immune Cells in Camel

Pulmonary Guardians and Special Regulatory Devices in the Lung of Nile Monitor Lizard (Varanus niloticus) with Special Attention to the Communication Between Telocyte, Pericyte, and Immune Cells

Mapping the Distribution of Special Structured Pulmonary Vasculatures in the Dromedary Camel (Camelus dromedarius): Histological and Histochemical Study

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