PubMed Health⌕ Search

SEARCH · PubMed Health

Results for “LYMPHATIC VESSELS”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 19 recordsLinked to original sources
PubMed1982

Ultrastructure of small intestine submucosal and serosal-muscular lymphatic vessels.

Lymphatic vessels of small intestine submucosal and serosal-muscular layers in mice and bats have been studied by electron microscopy and tridimensional reconstruction of thin serial sections. Lymphatic endothelium has a continuous appearance, it lacks fenestrations and pores and it is encircled by a thick connective tissue layer. The endothelial wall shows intraendothelial channels, quite similar to those previously described in the lacteal vessels. The author believes that the above mentioned intraendothelial channels, together with pinocytotic vesicles, play a fundamental role in the transendothelial transport of fluids, proteins and macromolecules. Moreover, intercellular specialized junctional complexes do not appear to take any part in this process.

Animals↗
PubMed1993

Further histological observations on popliteal lymph nodes after interruption of the afferent lymphatic vessels.

Lymphatic vessels afferent to the popliteal nodes in young adult rats and guinea pigs were interrupted at the lowest edge of the popliteal fossa, and regressive changes in the nodes occurring 4 to 16 or 18 weeks after surgery were re-examined histologically. In the rat, some popliteal nodes were drained by lymphatic channel(s) from the tail. After surgery, the popliteal nodes without lymphatic channel(s) from the tail underwent regression of all their constituent deep cortical units and also the peripheral cortex comprising lymph follicles, until at 18 weeks, the lymphoid organization of the node reached a minimal level. On the other hand, in popliteal nodes having a lymphatic channel from the tail, some deep cortical units and the overlying peripheral cortex underwent hypotrophy, leaving the remaining units and their overlying peripheral cortex little affected. In the guinea pig, the treated nodes underwent progressive atrophy and ultimately became rudimentary, or even vanished, after 16 weeks. Treated rudimentary nodes were composed largely of stromal cells only, and these were replaced to a various extent by fat. The present results are discussed in relation to complete and incomplete inhibition of the afferent lymph flowing into the surgically treated nodes.

Animals↗
PubMed1988

Laminin and type IV collagen in different histological stages of Kaposi's sarcoma and other vascular lesions of blood vessel or lymphatic vessel origin.

Immunohistochemical staining was used to demonstrate basement membrane (BM) laminin and type IV collagen in eight cases of Kaposi's sarcoma (KS). These KS were not associated with AIDS and represented different histological stages of the disease: patch (three cases), plaque (one case), and nodule (four cases). Nine cases of benign angiogenic lesions, five of blood vessel origin, and four of lymphatic vessel origin were also studied. An early event in vascular proliferation at the patch stage of KS was an intersection of dermal collagen bundles and the appearance of granular BM material around this space. With the increase of amount and linear arrangement of BM material, well-defined capillaries were formed. Two types of capillary were found in KS lesions. One showed morphological features of blood capillaries, with a round lumen; thick, continuous BM, and occasional pericytes in the wall. The other included irregularly shaped vessels with thin, often disrupted BMs; thus these capillaries morphologically resembled lymphatic capillaries. BM staining also clearly revealed the vascular nature of the nodular lesions of KS, which were composed of a network of slit-like spaces surrounded by BMs. The solid tumor cell areas were sparse; they were composed of spindle-shaped cells surrounded by thin, interrupted basal laminae. By using antibodies against human laminin and human type IV collagen, it was also possible to demonstrate thin, widely disrupted BMs subendothelially in normal dermal lymphatic capillaries. Typically, the BMs in lymphangiomas and lymphangiectasias were continuous and more clearly defined.

Aged↗
PubMed1996

Blood vessel and lymphatic vessel invasion in resected nonsmall cell lung carcinoma. Correlation with TNM stage and disease free and overall survival.

BACKGROUND: The objective of this prospective study was to assess in 96 patients with resected nonsmall cell lung carcinoma (NSCLC) the prevalence of both blood and lymphatic vessel invasion (BVI and LVI) according to stage, as well as their prognostic value for disease free and overall survival. METHODS: BVI and LVI were evaluated by hematoxylin and eosin stains on surgical specimens after resection. Associations among variables were tested by Fisher's exact test or the chi-square test; prognostic values on time-failure data were analyzed by the log rank test and the multivariate Cox model. RESULTS: BVI was present in 52% of NSCLC cases and LVI in 59%. Venous but not arterial vascular invasion correlated with the T factor and pTNM, whereas LVI correlated with the N factor and pTNM. In univariate analysis, LVI but not BVI was associated with a short disease free interval (P = 0.0007) and poor survival (P = 0.0001). The estimated relative risk of death in patients with LVI was 3.2 compared with patients without LVI. In multivariate analysis, LVI and pTNM were additional predictors for poor disease free and overall survival. In this series, BVI had no prognostic value. CONCLUSIONS: The prevalence of BVI and LVI appeared high in patients with NSCLC, especially those with advanced pTNM stages. LVI was predictive of poor outcome, both time to recurrence and death.

Adenocarcinoma↗
PubMedDate not supplied

X-ray elemental analysis differentiates blood vessels and lymphatic vessels in the chick choroid.

PURPOSE: Chick choroidal lymphatics swell rapidly during recovery from form-deprivation occlusion, leading to the question of functional significance. To date, analysis of lymph in initial lymphatics has been problematic because of the difficulties of access. However, elemental composition can be determined using scanning electron microscope (SEM) X-ray microanalysis. This study investigated whether cryo-fixation would permit vascular fluids to be analysed in situ. METHODS: Two chicks were raised normally and seven were raised with monocular occlusion for 12 days before varying periods of normal visual experience. The eyes were rapidly frozen, fractured and X-ray spectra obtained from the lumina of lymphatic and blood vessels in a Cambridge S360 SEM. RESULTS: The elemental signatures of Na/Cl/K/P/S distinguished the two vessel types. CONCLUSIONS: These results suggest this bulk-frozen tissue technique can quantify relative changes in elemental species present in various ocular compartments in response to light-induced changes in the retina.

Angiography↗
PubMed1993

Influence of spontaneous contractions of the lymphatic vessels on the lymphatic absorption rate of the peritoneal cavity in CAPD.

The lymphatic vessels have sympathetic innervation. Noradrenaline increases the number of spontaneous contractions of the lymphatic vessels, whereas isoprenaline slows these contractions. The purpose of this study was to analyze the influence of the blockade of spontaneous contractions of the lymphatic vessels on the lymphatic absorption rate (LAR) in 6 patients on continuous ambulatory peritoneal dialysis (CAPD) by using 0.12 mg of isoprenaline added to 2 L of 2.5% dextrose dialysis solution. This dose of isoprenaline has been shown to inhibit bovine mesenteric lymphatic contractions. The LAR was measured by the quantification of the intraperitoneal disappearance of dextran 70 added to this same dialysis solution during a 4-hour dwell. All patients were submitted to a control test without isoprenaline. The LAR was 0.57 +/- 0.19 and 0.65 +/- 0.38 mL/minute (p > 0.05), with and without isoprenaline, respectively. We conclude that spontaneous contractions of the lymphatic vessels do not play an important role in the lymphatic drainage mechanism of the peritoneal cavity. The diaphragmatic contractions seem to be more important, since drugs that interfere with such diaphragmatic mechanisms alter the LAR.

Absorption↗
PubMed2001

Selective immunohistochemical staining of blood and lymphatic vessels reveals independent prognostic influence of blood and lymphatic vessel invasion in early-stage cervical cancer.

Lymphovascular space invasion was shown to play a key role in the progression of cervical cancer. Because of the absence of a specific marker for lymphatic vessels, earlier studies could not reliably distinguish between blood and lymphatic vessel invasion. By immunostaining for podoplanin, a novel marker for lymphatic endothelium, and for factor VIII-related antigen, we determined lymphatic and blood vessel invasion in tissue samples of 98 patients with cervical cancer pT1b treated by radical hysterectomy. Eleven (11.2%) specimens showed invasion of blood vessels, 20 (20.4%) showed invasion of lymphatic vessels, and 15 (15.3%) showed invasion of blood and lymphatic vessels. There was a strong association of lymphatic vessel invasion and lymph node involvement (P < 0.001). In univariate analysis, both blood and lymphatic vessel invasion failed to reach a statistically significant influence on overall survival, but a significant influence on disease-free survival was found (P = 0.0002 and P < 0.0001, respectively). In multivariate analysis of disease-free survival, only blood vessel invasion remained statistically significant (P = 0.0457). Lymphatic vessel invasion reached significance when lymph node status was excluded from the model (P = 0.0025). Both lymphatic vessel and blood vessel invasion occur frequently in early-stage cervical cancer. Determination of the vessel status may be of clinical importance because it signifies the risk of recurrent disease.

Adult↗
PubMed1995

[Anatomy of the lymphatic vessels and lymphatic tissue of the lungs and pleura].

The lymph system in the lungs and chest has a very important role in disease spreading and recovery. No organ in lymph can compare to lungs regard of lymph. Two lymph nets exist in the lung superficially and profoundly, and also mutually communicate at hilus level and interlobular septum. On profoundly level of the net lymph vessel exist three lymph nets around bronchus, artery and veins. The lymph tissue placed in lung is particularly characteristic for children. The regional lymph tiejof the lungs can be divide on intrapulmonal and extrapulmonal. According to lymph drainage from lung we are talking about three territories: upper, medial and lover which are not coincides with lobar division. The capillary lymph net of the parietal pleura accumulate on subpleural net, from were leaving to regional lymph's nodes.

Humans↗
PubMed1992

Peptide-containing innervation of rat femoral lymphatic vessels.

The lymphatic vessels conduct lymph fluid, proteins, and potentially antigenic material from the interstitium back to the bloodstream via lymph nodes, where solids are removed by phagocytic cells and recirculating lymphocytes and immunoglobulins are added. Immunostaining for two general neuronal markers, protein gene product 9.5 (PGP 9.5), a cytoplasmic ubiquitin C-terminal hydrolase, and synaptophysin, a calcium-binding four-span integral synaptic vesicle membrane glycoprotein, disclosed an abundant innervation of the large femoral lymphatic vessels in rats. This confirms and extends earlier findings based on nonspecific intravital methylene blue and silver impregnation staining methods. Nerves containing neuropeptide Y, C-flanking peptide of neuropeptide Y, and tyrosine hydroxylase, markers of noradrenergic postganglionic sympathetic fibers, were frequent whereas immunoreactivity to vasoactive intestinal peptide, a neuropeptide present in many cholinergic parasympathetic nerve fibers, was sparse suggesting possible sympathetic and parasympathetic influences. Furthermore, calcitonin gene-related peptide- and substance P-containing fibers were also present in the walls of lymphatic vessels suggesting a possible sensory influence in the coordinated myogenic responses. By comparison to normal light microscopy, confocal microscopy was found useful to trace the perihilar penetration of blood and afferent lymphatic vessels in lymph nodes. PGP 9.5-immunoreactive fibers were found in and around lymph nodes suggesting that there is a neural regulation of lymphoid node function. Because of their distribution, peptide-containing nerves may participate in regulating the capacity of the lymphatic pumping activity, and may possibly exert paracrine effects on lymphocytes.

Acetylcholinesterase↗
PubMed2000

Regeneration of lymphatic vessels and lipometabolism in an experimental rat model of extensive dissection of the abdominal periaortic lymphatic vessels and lymph nodes.

The present study was conducted to analyze the regeneration of lymphatic vessels and lipometabolism in an experimental rat model of extensive dissection of the abdominal periaortic lymphatic vessels and lymph nodes from the renal artery to the mesenteric and celiac artery. Findings showing the regeneration of mesenteric lymphatic vessels were classified as complete, incomplete, or no regeneration. The incomplete regeneration of fine irregular lymphatic vessels was observed in all rats, 2 and 3 weeks postoperatively. At the same time, triglyceride (TG) was found to be significantly lower (P < 0.05) in the rats that were given extensive dissection than in the control group, due to chylomicron blockade after lymphatic dissection. The TG recovered to within the normal range around 4 weeks postoperatively following the growth of fine regenerated lymphatic vessels or collateral route formation.

Animals↗