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PubMed1986

The renal cortical lymphatic system in the rat, hamster, and rabbit.

Rat, hamster, and rabbit renal cortical lymphatics were examined by light and electron microscopy. Rat and hamster kidneys possessed both intra- and interlobular lymphatics that were structurally similar at the light microscopic level. Ultrastructural examination of the hamster lymphatic endothelium, however, revealed an unusual arrangement of cytoplasmic extensions not seen in the other two species. The intralobular lymphatics were related primarily to tubules, afferent arterioles, and renal corpuscles and were consistent with lymph formation from both plasma filtrate and tubular reabsorbate. Interlobular lymphatics were seen in connective tissue associated with the interlobular blood vessels. Rabbit cortex contained only interlobular lymphatics. Cross-sectional area, maximum diameter, volume density, and profile density were determined by stereological measurements using a computer-based image analyzer. The morphological data from the rat were used, in combination with published values for lymph flow, to calculate the rate of lymph formation per unit area of endothelium in lymphatics of the renal cortex. Among kidneys fixed by retrograde perfusion, the cortical lymphatic system was most extensive in maximum diameter, volume density, and profile density. It was smallest in the rabbit and intermediate in the rat. Lower volume and profile density were found for rat kidneys fixed by the dripping technique. It was concluded that: tubular reabsorbate probably contributes to renal lymph in the rat and hamster, but not in the rabbit; significant differences exist in the extent of the renal lymphatic systems among the three species, with the hamster kidney having the richest network and the rabbit the poorest; the method of fixation influences the measured size and density of renal cortical lymphatics; and the estimated rate of lymph formation in the kidney of the rat is roughly comparable to that in the dog.

Animals↗
PubMed1981

The lymphatic system. Some surgical considerations.

This article on the lymphatics was undertaken for three reasons: The first is to recount the story of the rediscovery of these vessels in the 17th century and briefly review the subsequent events leading up to our present knowledge of the lymphatic system. The second is to emphasize the role of the lymphatics in maintaining extracellular fluid balance, in the removal of protein, fat, and other substances of large molecular size from the tissue spaces, and in the circulation of the lymphocytes from their germinal centers and storage depots to all parts of the body via lymphaticovenous connections. The third reason is to suggest that the responsibility for maintaining the transport function of the lymphatics properly belongs to the vascular surgeon.

Adolescent↗
PubMed1993

Developmental disorders of the lymphatic system.

Approximately 67% of human conceptuses die prenatally. Of these, a significant number involve a disorder of the lymphatic system. A small number of live-born children also exhibit congenital lymphatic malformations, including an estimated 60% of patients with Turner syndrome. These observations have prompted a search for the genetic and dysmorphologic basis and the different patterns of congenital lymphedema and associated anomalies. In this article, we attempt to summarize available pertinent information on congenital disorders of the lymphatic system and to propose a conceptual overview of lymphatic development.

Adult↗
PubMed1984

The relation of the lymphatic system to hemolymph nodes in the sheep.

Sublumbar lymphatic drainage was examined in fetal and adult sheep for potential connections with hemolymph (hemal) nodes. Despite numerous channels entering sublumbar lymph nodes there were no lymphatic communications with hemal nodes. In ovine ruminants hemolymph nodes are separate from the lymphatic system.

Animals↗
PubMed1996

Update on osteopathic medical concepts and the lymphatic system.

The osteopathic medical profession has long recognized the importance of the lymphatic system in maintaining health. A review of scientific studies shows much information on the mechanisms and importance of lymph circulation. Many osteopathic manipulative techniques designed to treat patients with tissue congestion are based on early research recognizing that lymph flow is influenced by myofascial compression. Osteopathic manipulative treatment of the diaphragm was substantiated when pressure differentials created by the thoracic diaphragm were shown to influence lymph flow. Current research demonstrates that autonomically mediated, intrinsic lymphatic contractility plays a significant role in lymph propulsion, supporting the use of osteopathic manipulative techniques directed at influencing the autonomic nervous system to improve lymphatic circulation. Although research provides an explanation of how osteopathic manipulative techniques influence the lymphatic system, experimentation to test the direct influence of manipulation on lymph circulation is needed. Clinical outcomes studies are also necessary to substantiate the clinical efficacy of osteopathic manipulative techniques.

Homeostasis↗
PubMed1998

Nested case-control study of tumors of the hemopoietic and lymphatic systems among workers in the meat industry.

Workers in the meat industry are exposed to viruses that cause leukemia and lymphoma in cattle and chickens, and also to carcinogenic chemical agents. This case-control study, nested in a cohort of members of a meatcutters' union in Baltimore, Maryland, investigated whether occupational exposures are associated with death from tumors of the hemopoietic and lymphatic systems. Cases of these tumors represent all deaths which occurred in the cohort between 1949 and 1980. Excess risks of tumors of the hemopoietic and lymphatic systems were observed throughout the meat industry, except in meatpacking plants. Slaughtering activities involving heavy exposure to oncogenic viruses were strongly associated with these tumors, especially with lymphomas. Thus, elevated risks were observed for butchers who killed animals (odds ratio (OR) = 5.3, 95% confidence interval (CI) 1.0-27.0); workers in chicken-slaughtering plants (OR = 3.3, 95% CI 0.8-13.1); and workers in cattle/sheep/pig abattoirs (OR = 2.8, 95% CI 0.8-9.5). Among supermarket workers, wrapping meat (mainly a female activity) was associated with increased risk of tumors of the hemopoietic and lymphatic systems (OR = 3.8, 95% CI 1.0-14.3), with the odds of both lymphomas and tumors of the myeloid stem cell being elevated. On the other hand, meatcutting in supermarkets (almost exclusively a male activity) was associated with multiple myeloma; the odds ratio for men was 18.0 (95% CI 1.6-207.5), with no myeloma cases being recorded in women. These associations persisted after limited control for exposures outside the industry that have also been observed to be associated with excess risk, such as exposure to pesticides, working/living on pig farms, and exposure to X-rays. The findings provide evidence that workers in the meat industry may be at elevated risk of tumors of the hemopoietic and lymphatic systems. Further studies with larger sample sizes are needed to identify more conclusively which exposures play an etiologic role in the occurrence of the different histologic types of these tumors.

Adult↗
PubMed1987

A model of the lung interstitial-lymphatic system.

Our model of the pulmonary interstitial-lymphatic system is based on the assumption that the lung interstitial space can be divided into two compartments. The first compartment (C1) contains the terminal lymph vessels. Increases in the fluid pressure within this compartment, along with increased pressure generated by lymph vessel pumping, cause the lymph flow rate to increase. The lymph vessels run through the second compartment (C2) which we believe represents the perivascular spaces. Increases in the fluid volume of C2 cause the lymph vessels to dilate and this causes lymph vessel resistance to decrease. Normally the lymph flow rate equals the microvascular filtration rate so that lung fluid volume is constant. According to our model, increases in filtration rate cause fluid to collect in C1 and C2. The resulting increase in fluid pressure in C1, increased lymph vessel pumping, and the decrease in lymph vessel resistance in C2 cause lymph flow to increase. Eventually, the lymph flow rises to equal the filtration rate and lung fluid volume becomes constant again. The results of simulations with our model indicate that decreases in lymph vessel resistance are essential for lymph flow to increase substantially as edema develops.

Extracellular Space↗
PubMed2002

The lymphatic system of the deep inferior epigastric artery perforator flap: an anatomical study.

The anatomical basis of the lymphatic system of the deep inferior epigastric perforator (DIEP) flap was studied in 24 abdominoplasty specimens and in three fresh cadavers. Methylene (n = 4), patent (n = 4) and Turnbull's (n = 8) blue were compared by injecting the dye intradermally. To facilitate staining, two different types of vacuum technique were used: a vacuum chamber (n = 4) and the vacuum-assisted method (n = 4). The lymphatic collectors were dissected, and embedded in paraffin for histological investigation. The most useful dye was Turnbull's blue. The vacuum had no effect on the distribution of the dye. Manual injection showed three parallel superficial collectors situated directly under the skin. Turnbull's blue was also injected into the rectus fascia to demonstrate the collectors of the deep abdominal structures. They run horizontally, and perforate the fascia to run with the inferior epigastric artery. Care should be taken when dissecting the pedicle, or removing the epithelium, to avoid destroying the lymphatic system of the flap.

Abdomen↗
PubMedDate not supplied

Lymphatic system changes in diabetes mellitus: role of insulin and hyperglycemia.

BACKGROUND: Diabetic alterations of blood vessels have been well studied, but much less is known about the lymphatic system, which plays an important role in the transport of particles and defensive responses. Accordingly, we investigated lymphatic changes in diabetic rats. METHODS: Ten, 30 or 60 days after alloxan-induced diabetes (40 mg/kg; i.v.), we studied thoracic duct lymph flow and lymphocyte output, thoracic duct lymph transport of radiotracer particles ((99m)Tc-dextran 500), lymph node uptake and scintigraphic visualization of subcutaneously injected radiotracer particles, as well as the effect of insulin administration and food deprivation. RESULTS: Diabetes significantly increased thoracic duct lymph flow and the transport of dextran from the footpad subcutaneous tissue. Abnormal lymphocyte output from the thoracic duct occurred in the first 10 days. Uptake of dextran into regional lymph nodes was decreased in diabetes. Insulin per se, although not normalizing blood sugar levels, appeared to recover thoracic duct lymphocyte output and lymph node uptake of (99m)Tc-dextran 500 without affecting the thoracic duct lymph flow or the amount of radiotracer recovered therein. Normalization of glycemia (by food deprivation) restored the lymph flow to control levels without modifying the lymphocyte output. On the other hand, under insulin-restored normoglycemic conditions, both the thoracic duct lymph flow and the lymphocyte output were normalized. CONCLUSIONS: These findings suggest that variables related to defensive mechanisms, such as lymphocyte recirculation and particles uptake into the lymph nodes can benefit from insulin treatment, whereas glycemic control can benefit transport mechanisms in the lymphatic system, such as lymph flow and lymphatic transport of particles.

Animals↗
PubMed2006

Pearls and pitfalls of radionuclide imaging of the lymphatic system. Part 1: sentinel node lymphoscintigraphy in malignant melanoma.

Radionuclide imaging of the lymphatic system has a major role in the management of two main patient groups. First, pre-operative lymphoscintigraphy is a highly accurate method of sentinel node localization and can help guide minimally invasive surgery in a variety of tumour groups. Second, lymphoscintigraphy can play a pivotal role in assessing the cause of extremity swelling. This is the first of two pictorial essays on radionuclide imaging of the lymphatic system and will focus on sentinel node imaging in malignant melanoma. Regional nodal sampling is routinely performed in an increasing number of tumour groups and is well established in malignant melanoma and breast carcinoma. Careful attention to technical performance and image interpretation is essential to maximize the clinical utility of the test. This article provides a pictorial review of the interpretative pearls and pitfalls of sentinel node lymphoscintigraphy in malignant melanoma patients.

Adult↗
PubMed2001

The physiology of the lymphatic system.

This paper presents an overview of the anatomy, physiology, and biology of the lymphatic system specifically relevant to lymphatic drug delivery. We will briefly review the classic fluid and solute transport literature, and also examine the current research in lymphatic endothelial cell biology and tumor metastasis in the lymphatics because of the increasing potential for targeted delivery of immunomodulators, chemotherapeutics, and genetic material to specific lymph nodes (Refs. [1-7]).

Animals↗
PubMed1978

[Cytokinetics of lymph nodes in lymph nodes in lymphatic system diseases (author's transl)].

Untreated malignant lymphatic system diseases are characterized by a preponderance of cell new formation (proliferation) against the destruction of lymphatic cells. If the lymph nodes are enlarged during these diseases, then cell new formation occurs largely or mostly in these lymph nodes. The proliferating cells of the lymph node are bigger than small lyphocytes and have, in general, a mean diameter of the nucleus of 10 mu and more. In normal lymph nodes they belong morphologically to the big lymphocytes, immunoblasts and plasmoblasts. In pathological lymph nodes they have to be looked for among the bigger cells of the disease-specific cell population. Whereas in healthy lymph nodes and in chronic lymphatic leukemia only about 1% of lymph node cells was found to proliferate, they amount on the average to 5% in lymphomas of lymphogranulomatosis and mostly to 30--50% in the lympho-reticulosarcoma (lymphoblast and immunoblast sarcoma, corresponding to large-cell, poorly differentiated lymphomas). The proliferating cells often appear as foci in the lymphomas. The generation times of the proliferating cells both in normal and pathological lymph nodes are about 24 hrs. or slightly longer. In lymphatic proliferation, apart from plasma cells big and smallymphocytes are produced in the normal lymph node; in CLL, big and small lymphocytes, in lymphogranulomatosis, big and small lymphocytes and Hodgkin-cells, and in poorly differentiated lymphomas, the corresponding lymphoma cells are produced. The clinicist is at the beginning of drawing conclusions from prevalent kinetic disturbances.

Cell Division↗