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S. M. Zargar and N. Jamshidi
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Translational Challenges: Lymph
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Node Tissue Engineering
PhilippNeßbach andMatthiasM.Aitzetmüller
25
25.1 Introduction
Chronic lymphedema results from a progressive pathological condition of the lymphatic system. It is a combination of an accumulation of protein­rich uid, inammation, brosis, and hypertro­phy of adipose tissue. This often leads to a clinical picture of disgurement and decreased mobility and function. The dysfunction of lymphatic transport can be described as a lack of removal of net uid efux from the capillaries. An accumu­lation in the interstitium and following pressure on the skin is the result. This interstitial uid is up to 90% reabsorbed by venous capillaries. In healthy patients, the remaining 10% are removed by lymphatic vessels to blood as lymph [1]. Macromolecules like proteins are rst degraded by macrophages and normally afterwards also
P. Neßbach (*) Department for Plastic and Hand Surgery, Klinkum rechts der Isar, Technical University of Munich, Munich, Germany e-mail: philipp.nessbach@tum.de
M. M. Aitzetmüller Department of Plastic and Hand Surgery, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
Section of Plastic and Reconstructive Surgery, Department of Trauma, Hand and Reconstructive Surgery, Westfaelische Wilhelms, University of Muenster, Muenster, Germany e-mail: aitzetmueller@tum.de
removed by lymphatic vessels from the intersti­tium [2]. Chronic lymphedema results from an imbalance in lymph transport.
Lymphedema is classied into primary and sec­ondary causes. Among primary, all congenital causes are summarized. Furthermore, secondary lymphedema comprises all causes which are acquired by disruption of lymph transport. Congenital hereditary lymphedema as well as Milroy disease occur in the rst 2 years of life. Milroy disease is an autosomal-dominant pattern which mostly affects lower extremities and causes intestinal lymphangiectasia and cholestasis [3]. It is known to be connected genetically to a mutation in the VEGFR-3 tyrosine kinase signaling pathway [4, 5]. Familial lymphedema praecox, also known as Meige disease, occurs during puberty. Another autosomal-dominant pattern which is associated with the loss of hearing, cerebrovascular malfor­mations, vertebral defects, and distichiasis [6]. Lymphedema tarda is the primary form which occurs latest in life, that is, after the age of 35 [1].
The most prominent etiology of secondary lymphedema is lariasis secondary which is caused by a nematode Wuchereria bancrofti and affects more than 90 million people worldwide [7]. In industrial countries, female breast cancer and its treatment play an important role in the develop­ment of chronic lymphedema. According to the American Cancer Society, there are two million breast cancer survivors of which 20% suffer from chronic lymphedema [8]. In Germany there are
© Springer Nature Switzerland AG 2019 D. Duscher, M. A. Shiffman (eds.), Regenerative Medicine and Plastic Surgery,
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approximately 1.2 million patients suffering from lymphedema [9]. Mostly upper extremities are affected by lymphedema with rates from 24% to 49% after mastectomy [1014] and 4–28% after lumpectomy [15, 16]. Both main treatments for breast cancer patients, radiation and dissection of lymph nodes in the axillary region, increase the risk of chronic lymphedema [15, 1720]. After intro­ducing sentinel lymph node biopsy to detect breast cancer spread, a signicant decrease in lymph­edema cases had been shown in comparison to the traditional dissection of lymph nodes [2125]. Various known factors such as obesity, infection, and trauma increase the risk of lymphedema for women after breast cancer therapy [11, 16, 26, 27].
25.2 Clinical Presentation andDiagnosis
Lymphedema is characterized by an accumula­tion of subcutaneous interstitial uid and adipose tissue. Inammation occurs simultaneously with the accumulation of uid and the decreased removal of lymph uid. This also leads to more fat deposition and lipogenesis which results in an increased activation of brosis and proliferation of connective tissue [2830]. Subcutaneous tis­sue in patients becomes harder and brosis devel­ops. Furthermore, hypertrophy of adipose tissue occurs. This rst results in a swelling of the dis­eased site and is often characterized as brotic and soft, and turns into a hardened state over time. The International Society of Lymphology dened the clinical classication for lymph­edema using the following terminology [31]:
• Stage I: Represents an early accumulation of
uid relatively high in protein content (e.g., in comparison with “venous” edema) and sub­sides with limb elevation.
• Stage II: Signies that limb elevation no lon-
ger reduces tissue swelling, and pitting is manifest. Later in Stage II, pitting is less evi­dent as tissue brosis supervenes.
• Stage III: Encompasses lymphostatic elephan-
tiasis where pitting is absent and trophic skin changes such as acanthosis, fat deposits, and warty overgrowths occur.
Even though a swelling by itself does not induce serious symptoms, cellulitis may occur due to proliferation of microbes in the accumulated interstitial uid. A common effect is the progres­sion of lymphedema by lymphangitis, which results in lymphatic vessels destruction. Papillomatosis, hyperkeratosis, and skin break­down are additional changes in skin quality that regularly occur [32]. Lymphangiosarcoma, Kaposi sarcoma, and lymphoma represent cutaneous malignant tumors which are rare complications of chronic lymphedema [33]. A subsection of women who developed a signicant lymphedema follow­ing radical mastectomy and who were diagnosed with ensuing lymphangiosarcoma are suffering from Stewart Treves syndrome. Around 200 patients are reported up to now with a mean sur­vival time of 19months [
3438].
Patient history and clinical presentation are the basis for diagnosis of lymphedema in later stages (Table25.1).
Common causes of limb edema are challenging to differentiate from early stages of lymphedema. Cardiac failure, protein-losing conditions, local eti­ologies including lipedema, vein thrombosis, myx­edema, chronic venous insufciency, and idiopathic edema are systemic causes for differential diagno-
Table 25.1 Symptoms and factors for lymphedema diagnosis
Associated symptoms
Chronic skin breakdown Recurrent cellulitis
Clinical signs
Soft, pitting edema (early stage) Cellulitis Fibrosis and induration (late stage) Hyperkeratosis Papillomatosis Peau d’orange skin changes Positive Stemmer sign (lower extremity lymphedema)
Reported risk factors
Familial history of congenital lymphedema History of infection History of malignancy History of radiation therapy History of trauma Obesity Prior surgical procedures, particularly nodal dissection Travel to geographical region with endemic lariasis
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sis of lymphedema [1]. Positive Stemmer sign as well as peau d’orange changes in the skin and cuta­neous and subcutaneous brosis are indicators for lymphedema during physical examination [39, 40]. Circumferential and volumetric measurements are commonly used for lymphedema documentation as well as comparison between a patient’s healthy and diseased limbs. Tonometry, perometry, and bioelectric impedance analysis are noninvasive, advanced methods for clinical examination [41
44]. Analysis in body composition typically make
use of bioimpedance. This technology allows a direct measurement and is able to differentiate between edema and limb volume [45, 46]. Bioelectric impedance is a reliable and reproduc­ible technique which has shown the capacity to indicate lymphedema in women following breast cancer treatment [4749].
Magnetic resonance imaging, computed tomog­raphy, and lymphoscintigraphy are used if clinical examination is not capable of a secure diagnosis. Lymphoscintigraphy makes use of a radiolabeled marker which is intradermally injected and stains lymphatic vessels [50, 51]. Delayed transport of the radiolabeled marker, backow, dermal diffu­sion, and meager visualization of lymph nodes and vessels are common anomalies for lymphedema [52]. Furthermore, computed tomography is a 100% specic and 97% sensitive technique to con­rm lymphedema diagnosis [53]. Magnetic reso­nance imaging is more cost intensive but able to show a more detailed lymphatic structure. In addi­tion it was shown to have similar sensitivity and specicity for lymphedema diagnosis, without exposure to radiation [54].
Radiologic examination techniques for lymph­edema diagnosis are only necessary in cases in which patient history and physical examination are insufcient. For most patients, there is no need for lymphoscintigraphy, magnetic resonance imaging, or computed tomography, and clinical diagnosis guides the treatment algorithm.
25.3 Traditional Treatment
The most prevalent conservative treatment is complete decongestive therapy (CDT), which has become internationally recognized. More
than 90% of lymphedema patients are treated with CDT.This therapy is supported by its four mainstays: manual lymphatic drainage, com­pression treatment, exercise, and skin care. It needs to be provided by specialized physiothera­pists. In addition, CDT is a symptomatic treat­ment, which makes it necessary to perform CDT lifelong. The biggest disadvantages are the lack of disease elimination and the high expenditure of time. The use of special compression devices that mimic manual lymphatic drainage is rare. Due to the danger of centralized edema, this pro­cedure is effective only in a small proportion of patients and must be supervised by physicians [55].
Since several decades various surgical proce­dures have existed; however, none has been established as a gold standard for lymphedema treatment. For a small group of patients, who are suffering from a special combination of lymph­edema and lipedema, liposuction offers a long­term symptomatic improvement. However, tissue removal is a very stressful procedure, which is rarely performed today [56].
The goal of reconstructive surgery is to cor­rect the cause of the disease by restoring lym­phatic drainage. Reconstructive procedures are only offered in a very few specialized hospitals. Established operating procedures are bypasses between lymphatic vessels (lymphatic grafting) and connections between lymphatic vessels and veins (lymphovenous anastomosis). Both pro­cedures use elaborate microsurgery with rela­tively high treatment risks and long surgical times [5759]. Alternatively, an autologous transplantation of lymph nodes (microvascular lymph node transplantation), lymph node bun­dle with surrounding fatty tissue, in the sense of a free ap, is taken from a healthy site and microsurgically transplanted into the diseased site. Thereby blood vessels are connected to each other by complex microsurgery, resulting in higher risks for the patient and frequent problems at the donor site, such as secondary lymphedema. Among the existing surgical pro­cedures, microvascular lymph node transplan­tation is the most promising [6063]. A graphical overview of treatment options is pro­vided in Fig.25.1.
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P. Neßbach and M. M. Aitzetmüller
Fig. 25.1 Traditional and regenerative treatments for chronic lymphedema
25.4 Regenerative Treatment: Lymph Node Tissue Engineering
Tissue engineering and its area of clinical appli­cation, regenerative medicine, aim to regenerate the body’s own tissue and organs by introducing the use of three-dimensional scaffolds, different cell types, and growth factors. The scaffold serves as temporary three-dimensional support structure for mechanical stabilization, organization, prolif­eration, and differentiation of the involved cells. Scaffolds take over the function of the extracel­lular matrix and are subject to correspondingly high demands. An ideal scaffold should have an interconnecting pore structure that allows the migration of cells and their supply of nutrients and oxygen [64, 65]. These properties were pre­viously difcult to implement by using conven­tional fabrication methods for scaffolds. In traditional techniques (textile technologies, plas-
tic processing), the results are not reproducible (pore size, mechanical properties, lament thick­ness), or cytotoxic or carcinogenic solvents are used. These residues have a negative inuence on the biocompatibility of the scaffold. Through the introduction of additive manufacturing tech­niques in tissue engineering, many obstacles were overcome. The mechanical properties of the scaffolds could thus be controlled down to small levels and play an important role in the eld of tissue engineering and especially in lymph node regeneration [66, 67]. A suitable scaffold should have the same biomechanical properties as the surrounding tissue at the time point of implanta­tion. The degradation of the biodegradable polymer must fulll requirements such as main­taining rigidity and the three-dimensional struc­ture as well as allowing surrounding cells to migrate and proliferate [64, 66].
The high potential for regeneration of lym-
phatic tissue is characterized by numerous studies
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by Jaffe etal. and known since the 1920s [68]. In a rat model, they were able to show, that autolo­gous transplanted lymph nodes regenerate within 6 days. These lymph nodes were previously transplanted avascular into muscular abdominal wall. Several years later, in the 1980s and 1990s the group Papst etal. introduced the concept of transplanting autologous lymph node fragments [6971]. Lymph node fragments were trans­planted in different anatomical regions (inguinal, mesentery of ileum, and omentum majus) of minipigs. Inguinal transplanted fragments showed good regeneration, whereas the omentum majus fragments did not show regenerative char­acteristics. The group Papst etal. [69] assumed that subcutaneously transplanted lymph node fragments are more capable of connecting to afferent lymphatic vessels than the fragments of omentum majus.
After several decades and with increasing progress in regenerative medicine, approaches of articial lymph nodes were introduced [72]. The complex three-dimensional structure with cortex and the composition of various cell types is a big challenge for researchers [73]. First articial lymph nodes were made using collagen sponges and stroma and dendritic cells [74]. These arti­cial lymph nodes were transplanted subcapsular into kidneys of immunodecient mice. A sec­ondary immune response was shown, starting from the articial lymph node after antigen exposure. B and T cells migrated from the arti­cial lymph nodes to the spleen and bone marrow and became antibody-secreting plasma cells [74,
75]. Another approach is using polyurethane
scaffold which is seeded with murine T zone broblastic reticular cells. A connection was dis­covered between interstitial ow velocity and the secretion of CCL21. At low ow rates, gene expression of CCL21 was downregulated [76]. CCL21/CCL19 and its receptor CCR7 have an inuence on the migration of antigen-presenting cells and T lymphocytes from the periphery to the lymph nodes [7779]. The mentioned arti­cial approaches combine the time-consuming cell isolation and culturing steps for the produc­tion of articial lymphatic tissue.
A further development of the already referred methods is the introduction of the idea to com­bine autologous lymph node fragments and bio­degradable scaffolds. There are two promising ideas combining lymph node fragments and scaf­folds. On the one hand, Hadamitzky etal. [80], who used aligned nanobrillar collagen scaffolds and, on the other hand, Kwak etal. [81, 82] who used polycaprolactone (PCL) tubes.
Hadamitzky etal. [80] performed a porcine model of secondary lymphedema in minipigs. Here, 10 aligned nanobrillar collagen scaf­folds (10–12cm each) were implanted into the groin of a previously operated and irradiated minipig. Three months after implantation the scaffolds were analyzed histologically, the lym­phatic function was determined by bioimped­ance ratio, and the lymphatic regeneration was quantied by computed tomography. It was found that aligned nanobrillar collagen scaf­folds provide mechanical support for directed lymphangiogenesis. The density of lymphatic vessels increased as well as the lymphatic func­tion improved.
The whole concept of Kwak etal. [81] is pro­vided in Fig. 25.2. A lymphedema patient pro­vides a lymph node from a healthy donor site. This removed lymph node is then fragmented and xed inside the PCL scaffolds by using brin glue (bioarticial lymph node). Several of these bioarticial lymph nodes are then implanted close to an artery into the diseased region. In the following months, the bioarticial lymph nodes induce growth factor release and regeneration of the lymphatic system.
In previous studies, Kwak etal. used tubular, porous PCL scaffold in immunodecient mice in combination with human lymph node fragments. After 8 and 16 weeks, samples were taken and histological and immunohistochemical staining were performed. It was shown that the combina­tion of lymph node fragments and PCL scaffold result in higher vascularization as well as pres­ence of lymphatic endothelial cells [82]. These cells are responsible and essential for building lymphatic vessels and regenerate lymphatic function.
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5) Body regeneration
P. Neßbach and M. M. Aitzetmüller
1) Removal of 1-2 lymph
nodes from a healthy area
2) Fragmentation of lymph nodes
4) Implantation into the diseased area
Fig. 25.2 Method for bioarticial lymph nodes according to Kwak etal. [81]
25.5 Conclusions
avoid these risks, in the future, novel translational
3) Preparation as bioartificial lymph nodes
treatment approaches harnessing the possibilities
Lymphedema patients often go through a long ordeal. They consult a number of physicians according to their cancer disease and following lymphedema symptoms. A well-documented clinical history and physical examination typi­cally are sufcient to provide clear diagnosis of chronic lymphedema. In obscure cases, addi­tional lymphoscintigraphy and/or magnetic reso­nance imaging lead to a diagnosis.
Even after diagnosis, the suffering of patients with chronic lymphedema is high. The existing options for treatment often do not contribute to a signicant improvement in the quality of life.
of regenerative medicine are warranted.
The most innovative regenerative medicine paradigms are related to cell processing and cul­turing, which typically leads to a harsh regulatory situation which is time- and resources consum­ing. The approaches that combine autologous lymph node fragments and biodegradable scaf­folds therefore are particularly promising. They do not require problematic regulatory processes because they are considered medical devices (no cell processing). Additionally, they promote true regeneration of the lymphatic system instead of treating the disease only symptomatically.
Complete decongestive therapy is effective, but is only symptomatic and needs to be continued life­long [55, 83]. Microvascular lymph node trans-
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