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UROTHERAPY FOR PATIENTS WITH CANCER ---Joseph Eldor, MD

(2007-11-19 07:57:45) 下一个
Joseph Eldor, MD

Theoretical Medicine Institute
P.O.Box 12142, Jerusalem, 91120,Israel

 Abstract
 
          Cancer cells release various antigens, some of which appear
          in the urine. Oral auto-urotherapy is suggested as a new
          treatment modality for cancer patients. It will provide the
          intestinal lymphatic system the many tumor antigens against
          which antibodies may be produced. These antibodies may be
          transpierced through the blood stream and attack the tumor
          and its cells.
The philosophy of cancer Microbes were known long before the germ theory of disease was invented. It was not the discovery of germs that revolutinized medicine, but the invention of a philosophy of medical explanation that permitted germs to be causative agents of disease (1). Burnet and Thomas (2) postulated that specific cell mediated immunity may have evolved in vertebrates specially for defense against the "enemy within" rather than against infecting microorganisms and parasites. Most human cancers appear to lack truly tumor-specific antigens. The same neoplastic cell can express several different tumor antigens. For example, relatively cross-reacting tumor-specific transplantation antigens have been demonstrated in many chemically induced tumors (3). Tumor-associated differentiation antigens are shared by neoplastic and embryonic cells (4). The extent to which human patients react immunologically against their cancers has been a subject of much controversy (5). Paul Ehrlich, in 1909, said:"I am convinced that during development and growth malignant cells arise extensively frequently but that in the majority of people they remain latent due to the protective action of the host. I am also convinced that this natural immunity is not due to the presence of antimicrobial bodies but is determined purely by cellular factors. These may be weakened in the older age groups in which cancer is more prevalent" (6). Tumor antigens in urine Human melanoma cells express membrane antigens distinct from those of the normal ectodermal counterparts (7). Urinary-tumor-associated antigen (U-TAA) is one such antigen. This high-molecular weight glycoprotein was first described when melanoma urine was found to react with autologous antibody (8). The antigen has since been detected in the urine of 68% of melanoma patients. In addition, high levels of U-TAA are found to correlate positively with disease occurrence in surgically treated patients (9). Prostatic specific antigen (PSA) has become an important laboratory test in the management of prostate cancer. PSA levels can be as readily obtained from voided urine as from serum samples (10). Quantitative urinary immunocytology with monoclonal antibody (mab) 486p 3/12 proved to be valuable for diagnostic use in bladder-cancer patients` urine, especially in the followup of patients with superficial bladder carcinoma (11). Quantitative urinary immunocytology is a general tool to test the diagnostic usefulness of mabs, assuming that normal and malignant cells differ in their quantitative expression of a given antigen. Selective criteria for selecting mabs for diagnostic approaches should ask not for tumor specificity, but for different quantitative expression of antigen in the tissues or cells in question. Gastric juice oncofetal antigen determination, due to direct shedding of antigens into the fluid around tumor tissues, appears to accurately indicate the presence and degree of gastric mucosal damage and to be to a slight extent influenced by unrelated factors (12). Patients` age, for example, modifies CEA serum levels (13). A monoclonal antibody (mab) against a human colorectal adenocarcinoma cell line has been raised (14), which reacts with sialosylfucosyllactoteraose (15) corresponding to the sialylated blood group antigen Lewis (a). The antigen defined by this antibody, CA50, is elevated in the serum of many patients with gastrointestinal tumors (16), with a sensitivity for gastric cancer ranging from 20 (17) to 65% (18). CA50 (a tumor-associated gangliosidic antigen) levels have been determined by an RIA test in serum, gastric juice and urine of patients undergoing upper gastrointestinal tract endoscopy. Sensitivity and specificity were respectively 23% and 89% for CA50 determination in urines (19). Soluble forms of membrane proteins such as cytokine receptors or cellular adhesion molecules (CD14, TNF receptor, CD25, IL-6 receptor, IFN-?receptor and CD54) have been detected in human body fluids. They may have important functions in immune regulation by blocking receptor/ligand interactions. The human adhesion receptor CD58 (LFA-3) is expressed on most cell types. A soluble form of CD58 (sCD58) was purified from human urine and partially purified from supernatant of the Hodgkin-derived cell line L428 (20). Urinary organ-specific neoantigen from colorectal cancer patients has been used to make a monoclonal antibody, BAC 18.1 (21). Organ-specific neoantigen originates in the colon and is excreted into the urine, so the BAC 18.1 binding levels in the urine may be a diagnostic aid for colorectal cancer. The polyamines spermidine, spermine and their diamine precursor putrescine are ubiquitous constituents of mammalian cells that are fundamentally involved in normal, malignant and induced proliferative states. The polyamines and ornithine decarboxylase (ODC), the rate-limiting enzyme of the polyamine metabolism, were found to play an important role in tumor promotion (22). The suggestion that polyamines play an important role in colorectal cancer was confirmed by studies that found elevated polyamine concentrations in blood or urine (23) of patients with colon carcinoma. Sensitivity of urinary polyamines for colon cancer were highest for total spermidine (92.1%), acetylated putrescine (84.5%), total putrescine (84.0%), N1-acetylspermidine (79.3%) and N8-acetylspermidine (78.6%), but in all these cases specificity was lower than 65% (24). In patients with successful curative surgical treatment all preoperatively elevated urinary polyamine concentrations markedly decreased and returned to normal, whereas they were elevated and increased further in patients with proven relapse of the tumor and/or metastases in different organs (24). The function of the CD44 gene is severely damaged, beginning with the very early pre-invasive stages of tumor development. This can be used as a means of tumor detection and diagnosis both on solid tissue specimens (25) and on exfoliated cells in clinically obtained excreta and body fluids (26). Urine cell lysates obtained from patients with bladder cancer can be discriminated from normal urine lysates (27) using Western blotting with a monoclonal antibody against the standard form of the CD44 protein. Immunotherapy Zbar and Tanaka (28) first reported on animal immunotherapy based on the principle that tumor growth is inhibited at sites of delayed hypersensitivity reactions provoked by antigens unrelated to the tumor.They injected living Mycobacterium bovis (strain BCG) into established intradermal tumors and caused tumor regression and prevented the development of metastases. For optimum therapeutic effect contact between BCG and tumor cells was necessary. The ability of tumor immune lymphocytes to localize specifically to tumor offers a possibility for therapy which has been utilized over the past several years (29). The rejection of murine tumors expressing tumor-specific transplantation antigens has been shown to be mediated primarily by immune cells (30). Some 6 to 7% of transplant recipients may develop cancer as a consequence of iatrogenic immunosuppression (31). Studies on the ability of patient lymphocytes to lyse tumor cells in short term (2-8 hr) isotope release assays have shown that lymphocytes from cancer patients can generally destroy only tumor cells from the same patient (32-34), unless the effector cells are not cytolytic T cells but, for example, Natural Killer cells or Lymphokine Activated Killer cells, in which case neoplastic cells representing many different types are sensitive. Immunotherapy is believed to be capable of eliminating only relatively small amounts of neoplastic cells and, therefore, the failure to induce a regression in patients with excessive tumor burden is not unexpected (35,36). One approach of immunotherapy is to "xenogenize" tumor cells by virus infection. Another is to culture tumor infiltrating lymphocytes with interleukin-2 and reinoculate them into the host with cytokines (37). The introduction of recombinant vectors expressing cytokine genes into tumor infiltrating lymphocyte cells (38) or into the tumor cells themselves (39) may enhance the migration of effector immune cells into the tumor with consequent immunomediated control. The considerable heterogeneity in the expression of tumor associated differentiation antigens by cells within the same tumor constitutes a problem for any immunotherapy, since it facilitates the escape of antigen-negative tumor variants. An alternative approach toward increasing the immune response to tumor-associated differentiation antigens is to treat the host to be immunized so as to abolish a "suppressor" response. Such treatment can be provided in the form of sublethal whole body x-irradiation (40), injection of a drug such as cyclophosphamide (41), or by the administration of certain anti-idiotypic antibodies (42). Anergy is defined as a state of T lymphocyte unresponsiveness characterized by absence of proliferation,IL-2 production and diminished expression of IL-2R (43,44). Most available data support suppression as a mechanism of oral tolerance (45,46). Immunological suppression is classically demonstrated by the suppression of antigen-specific immune responses by T lymphocytes (47,48). Autoantigens Oral administration of S-antigen (S-Ag), a retinal autoantigen that induces experimental autoimmune uveitis, prevented or markedly diminished the clinical appearance of S-Ag-induced disease as measured by ocular inflammation (49,50). Gut associated lymphoid tissue has the capacity to generate potent immune responses on one hand, and to induce peripheral tolerance to external antigens on the other (51-53). Both processes require antigen stimulation (53), involve cytokine production (51) and might occur at the same time - the first leading to potent local and systemic immune responses, while the latter leads to systemic antigen-specific nonresponsiveness (54). The generation of acquired immune responses in the small intestine is believed to occur in Peyer`s patches (51,55). Orally fed protein antigens are found in the blood within 1 hr of feeding (56). Peripheral tolerance is not induced locally, but rather is induced systemically upon transfer of intact antigen, or its peptides, into the circulation (57-59).Oral tolerance may be induced by a single feeding of a protein antigen (60,61) or by several intermittent feedings (46,62). In order to test whether feeding on autoantigen could suppress an experimental autoimmune disease, the Lewis rat model of experimental autoimmune encephalomyelitis was studied (63). With increasing dosages of GP-MBP, the incidence and severity of disease was suppressed, as well as proliferative responses of lymph node cells to MBP. Antibody responses to MBP were decreased but not as dramatically as proliferative responses. Thus it appears that oral tolerance to MBP, as to other non-self antigens (45), preferentially suppress cellular immune responses. It appears that homologous MBP is a more potent oral tolerogen for experimental autoimmune encephalomyelitis than heterologous MBP (64). Tumor cells may escape immune recognition in immunocompetent hosts by clonal evolution.Attention could be directed to activate the resident immune effectors to break the anergy or tolerance. Urotherapy Subcutaneous urine injections was practiced in 1912 by Duncan (65) from New York under the name of auto-pyotherapy for urinary infections, and in 1919 by Wildbolz (65) from Bern for diagnostic purposes. Cimino (66) from Palermo reported in 1927 on the use of auto uro-therapy for urinary infections. Rabinowitch (67) in 1931 described this auto-urine therapy for gonarthritis. Jausion et al. (68) used this kind of therapy in 1933 for desensitization and endocrinological problems. They treated with auto urotherapy injections patients who suffered from migraine, pruritus, asthma, urticaria, eczema, psoriasis, etc. Day (69)in 1936 treated patients with acute and subacute glomerulonephritis by injection of an autogenous urinary extract. Sandweiss, Saltzstein and Farbman (70) reported in 1938 that an extract from urine of pregnant women has a prophylactic and therapeutic effect on experimental ulcers in dogs. Shortly thereafter the same group noted that an extract from urine of normal women has a similar beneficial effect (71). In 1926 Seiffert first described the construction of ileal loop conduits for urinary diversion (72). Bricker in the 1950s popularized the use of the ileal loop as a means of supravesical urinary diversion following exenteration for pelvic malignancy in adults (73). Ureterosigmoidostomy as a means of urinary diversion was used widely from 1920 to 1955. It was this type of implant which Hammer first reported in 1929 associated with tumor (74). Peyer`s patches are immunocompetent lymphoid organs which participate in intestinal immune responses (75). Epithelial cells within the crypts of the small bowel are one of the fastest dividing cells in the body and yet they show one of the lowest rate of malignant transformation (76). Stem cells in the mucosa of the small bowel can divide every 8 to 12 hours (77). Tapper and Folkman (78) demonstrated that exposure of intestinal segments to urine causes marked lymphoid depletion in the segments. These studies give additional support to the idea that a lymphocyte suppressive factor exist in urine (79). The continued presence of urine bathing the intestinal mucosa appears to locally inhibit regeneration of the Peyer`s patches. Starkey et al. (80) detected in human urine a material that is biologically and immunologically similar to epidermal growth factor that causes proliferation and keratinization of epidermal tissues. The increased susceptibility of the colon to cancer associated with the existence of an implanted ureter has been theorized to relate to 3 factore: 1. The role of the urine in the colon (81,82). 2. The mechanical effect of the fecal stream on the stoma (83). 3. The age of the anastomosis (84). Adenocarcinoma of the colon mucosa is a recognized complication of ureterosigmoidostomy. The tumor, which develops adjacent to the junction of the ureter with the bowel, occurs 500 times as often as in the population at large and, in children so operated , 7,000 times as often as in all persons under age 25. The latency period is 5 to 50 years (81,85-87). It is common knowledge that malignant tumors may disappear spontaneously although very infrequently (88-90). Usually it is accepted that this could be due at least partly to an immunological reaction (91,92). Renal adenocarcinoma is one of the cancer types in which such spontaneous regressions have been described most frequently (88,90). Urinary extracts from patients with aplastic anemia (93) and idiopathic thrombocytopenic purpura (94) are capable of stimulating megakaryocyte colony growth in culture, and when injected into rats could also induce thrombocytosis in peripheral blood and megakaryocytosis in the spleens of these animals. Stanley et al. (95) demonstrated that rabbits immunized with human urine concentrates from leukemic patients developed antibody which neutralized the mouse bone marrow colony stimulating factor in human urine and human serum. 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