301
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Schenone H, Contreras MC, Borgoño JM, Rojas A, Villarroel F, Valdés J. [Chagas' disease in Chile. Rural and periurban sectors of the endemo-enzootic area. Relationship between housing conditions, domicilliary triatomid infestation and infection by Trypanosoma cruzi of the vector, humans and domestic mammals. 1982-1985]. BOLETIN CHILENO DE PARASITOLOGIA 1985; 40:58-67. [PMID: 3939408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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302
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Schenone H, Christensen HA, de Vásquez AM, González C, Méndez E, Rojas A, Villarroel F. [Feeding sources of domestic triatomas and their epidemiological involvement in relation to Chagas' disease in rural areas of 7 regions of Chile]. BOLETIN CHILENO DE PARASITOLOGIA 1985; 40:34-8. [PMID: 3939406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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303
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Valderrama M, Scotti M, Rojas A. Fluorinated barrelene-ruthenium(II) complexes with anionic chelating ligands. Polyhedron 1985. [DOI: 10.1016/s0277-5387(00)87232-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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304
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Schenone H, Contreras MC, Borgoño JM, Rojas A, Villarroel F. [Congenital Chagas' disease in Chile. Longitudinal study of the reproductivity of women with or without Chagas' disease and of some parasitological and clinical parameters of them and their corresponding children]. BOLETIN CHILENO DE PARASITOLOGIA 1985; 40:24-9. [PMID: 3939404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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305
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Contreras P, Altieri E, Liberman C, Gac A, Rojas A, Ibarra A, Ravanal M, Serón-Ferré M. Adrenal rest tumor of the liver causing Cushing's syndrome: treatment with ketoconazole preceding an apparent surgical cure. J Clin Endocrinol Metab 1985; 60:21-8. [PMID: 3964792 DOI: 10.1210/jcem-60-1-21] [Citation(s) in RCA: 67] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Ketoconazole, an imidazole derivative known to inhibit cytochrome P450-dependent adrenal enzymes was given to a patient with a functioning adrenal rest tumor of the liver in preparation for surgery. The drug was administered in a stepwise manner for 42 days starting with 400 mg and reaching 1 g the last 4 weeks of the trial. Clear clinical improvement was evident early in the trial and was associated with evidence of amelioration of her hypercortisolism and striking changes in serum and urinary levels of steroid hormones and metabolites. Sex steroids in serum and urine fell dramatically from the first day to the end of the trial. Urinary 17-ketosteroid excretion fell from a basal average of 139 mg/24 h to near normal levels within a week of therapy; serum testosterone fell from a basal level of 2.4 to 0.18 ng/ml; serum 17 beta-estradiol fell likewise from 1096 to 150 pg/ml. In contrast, cortisol levels in serum and urine increased in the first 2 weeks of the trial and subsequently fell to values below the basal levels. Similarly, serum 17 alpha-OH-progesterone levels increased 63% above the basal levels by day 6 of the trial and declined afterwards. Nine months after successful tumor resection the patient is apparently cured as judged by steroid hormone levels and physical appearance. We conclude that ketoconazole was effective in blocking tumoral steroidogenesis which resulted in clinical benefit.
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306
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Rojas A, Smith KA, Soranson JA, Minchinton AI, Middleton RW, Denekamp J. Enhancement of misonidazole radiosensitization by buthionine sulphoximine. Radiother Oncol 1984; 2:325-32. [PMID: 6522642 DOI: 10.1016/s0167-8140(84)80075-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The influence of glutathione (GSH) depletion on the radiation response and on the radiosensitizing efficiency of misonidazole (miso) has been studied in two types of mouse tumour and in mouse skin. Buthionine sulphoximine (BSO) has been administered in a variety of regimes, leading to a maximal depletion of GSH to 37% of control values in one tumour (CA MT) and 61% in the other (SA FA). Pretreatment with BSO did not alter the radiosensitivity of either tumour when treated with X-rays. It had a slight effect on the sensitizing efficiency of miso, corresponding to a factor less than three, which was detectable only at the highest X-ray doses used. No enhancement of miso efficiency was seen with 5 daily fractions. Prolonged administration of BSO resulted in a slight radiosensitization of mouse skin. When combined with miso the effect was very small and was only detectable at high X-ray doses. BSO however produced a marked enhancement of the acute toxicity of miso, as judged by lethality after large single doses.
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307
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Rojas A, Denekamp J. The influence of X ray dose levels on normal tissue radioprotection by WR-2721. Int J Radiat Oncol Biol Phys 1984; 10:2351-6. [PMID: 6096318 DOI: 10.1016/0360-3016(84)90244-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A variation in the degree of radioprotection by WR-2721 with X ray dose level is detectable in several normal tissue studies. A similar effect in tumors has been attributed to differential protection of oxic and hypoxic cells. For normal tissues it was previously postulated that it resulted from greater protection of 1 hit damage at low doses, with less protection of multihit damage. However, more extensive analysis of the normal tissue data, including both single dose and fractionated results show that it is not a universal effect in all normal tissues. It now seems more likely that varying PF values result from differential protection of cells at different oxygen tensions, even though the heterogeneity of oxygenation may not be detectable in the response to X rays alone.
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308
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Rojas A, Soranson J, Smith K, Minchinton A, Middleton R, Denekamp J. Effect of glutathione depletion on radiosensitivity in vivo. Int J Radiat Oncol Biol Phys 1984. [DOI: 10.1016/0360-3016(84)90562-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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309
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Williams MV, Rojas A, Denekamp J. Tumor sensitization and protection: influence of stromal injury on estimates of dose modification. Int J Radiat Oncol Biol Phys 1984; 10:1545-9. [PMID: 6090359 DOI: 10.1016/0360-3016(84)90500-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Tumor regrowth delay is an assay which reflects tumor cell kill but can be modified by growth rate changes resulting from damage to the stroma (tumor bed effects). If the stromal damage is modified by radiosensitizers and radioprotectors to a different degree from the tumor cells, the overall measurement of dose modifying factors may be influenced by the choice of a regrowth size for the growth delay analysis. We have studied the response of two mouse tumors; a fibrosarcoma which showed only a small TBE and a carcinoma which showed a very large TBE. Sensitizer enhancement ratios and protection factors have been obtained by assessing regrowth to a variety of endpoint sizes. The dose modifying effects on the stroma have then been determined by analyzing the regrowth rates of tumors after irradiation. The choice of endpoint size modified both the sensitizer enhancement ratio and the protection factor for both tumors. It appears that stromal damage may be the cause of the radioprotection observed in the carcinoma, whereas direct tumor cell radioprotection is indicated in the fibrosarcoma. Both direct tumor cell killing and cell death secondary to stromal damage will play an important role in determining the local control of irradiated tumors.
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310
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Minchinton AI, Rojas A, Smith KA, Soranson JA, Shrieve DC, Jones NR, Bremner JC. Glutathione depletion in tissues after administration of buthionine sulphoximine. Int J Radiat Oncol Biol Phys 1984; 10:1261-4. [PMID: 6469748 DOI: 10.1016/0360-3016(84)90329-8] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Buthionine sulphoximine (BSO) an inhibitor of glutathione (GSH) biosynthesis, was administered to mice in single and repeated doses of 0.5, 1 and 5 mmol kg-1 (i.p.). The resultant pattern of GSH depletion was studied in liver, kidney, skeletal muscle and three types of murine tumor. Liver and kidney exhibited a rapid depletion to GSH levels of ca. 20% of controls after single doses of 1-5 mmol kg-1 BSO. Muscle was depleted to a similar level, but at a slower rate after a single dose. All three tumors required repeated administration of BSO over several days to obtain a similar degree of depletion to that shown in the other tissues.
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311
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Flores B, Hernández G, Lepe A, Contreras MC, Sandoval L, Villarroel F, Rojas A, González O, Schenone H. [Epidemiology of Chagas' disease in Chile. Rural sectors. Domiciliary triatomid infestation and Trypanosoma cruzi infection of the vector and domestic mammals in Region V 1983]. BOLETIN CHILENO DE PARASITOLOGIA 1984; 39:62-65. [PMID: 6443179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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312
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Villarroel F, Rojas A, Contreras MC, Schenone H. [Epidemiology of Chagas' disease in Chile. Rural sectors. Domiciliary triatomid infestation and Trypanosoma cruzi infection of vectors and domestic mammals of the metropolitan region]. BOLETIN CHILENO DE PARASITOLOGIA 1984; 39:65-8. [PMID: 6443180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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313
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Contreras MC, Rojas A, Villarroel F, Schenone H. [Comparison of sensitivity of the indirect hemagglutination test for Chagas' disease in blood samples obtained by venous and capillary puncture (filter paper) in patients with positive xenodiagnosis]. BOLETIN CHILENO DE PARASITOLOGIA 1984; 39:60-2. [PMID: 6443178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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314
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Venegas L, Rojas A, Villarroel F, Contreras MC, Sandoval L, Schenone H. [Epidemiology of Chagas' disease in Chile. Rural sectors. Domiciliary triatomid infestation and Trypanosoma cruzi infection of the vector and domestic mammals of the Bernardo O'Higgins Region VI, 1983]. BOLETIN CHILENO DE PARASITOLOGIA 1984; 39:69-72. [PMID: 6443181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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315
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Abstract
The radioprotector WR-2721 and the radiosensitizer misonidazole have been studied for their influence on the response of mouse skin and tumours when irradiated with either single or fractionated doses of 240 kV X-rays or 3 MeV neutrons. The modification of radiosensitivity to neutrons was significantly less than that for X-rays, both for tumours and skin. When the two drugs were given in combination before single neutron doses, competitive interaction was observed.
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316
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Correa V, Zúñiga J, Briceño J, Contreras MC, Aranda JC, Valdés J, Rojas A, Villarroel F, Schenone H. [Epidemiology of Chagas' disease in Chile. Rural sectors. Triatomid domiciliary infestation, their rates of infection by Trypanosoma cruzi and new contributions to the knowledge of Chagas' infection in domestic mammals of IV Region (1982-1983)]. BOLETIN CHILENO DE PARASITOLOGIA 1984; 39:24-27. [PMID: 6441584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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317
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Bertoglia J, Rodríguez J, Gordillo N, Mendoza J, Contreras MC, Rojas J, Rojas A, Villarroel F, Schenone H. [Epidemiology of Chagas' disease in Chile. Rural sectors. Infection of domestic mammals by Trypanosoma cruzi and new contributions to the knowledge of domiciliary triatomid infestation in Region III, Chile (1982-1983)]. BOLETIN CHILENO DE PARASITOLOGIA 1984; 39:20-3. [PMID: 6441583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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318
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Schenone H, Schenone H, Peña A, Contreras MC, Sandoval L, Saavedra T, Villarroel F, Rojas A, López IM. [Prevalence of toxoplasmic infection in employees of a slaughterhouse in the city of Santiago, Chile]. BOLETIN CHILENO DE PARASITOLOGIA 1984; 39:33-4. [PMID: 6525222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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319
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Burchard L, Cornejo J, Cruz L, Contreras MC, Vargas L, Villarroel F, Rojas A, Schenone H. [Epidemiology of Chagas' disease in Chile. Rural sectors. Domiciliary triatomid infestation and Trypanosoma cruzi infection of the vector and domestic mammals of Region II (1983)]. BOLETIN CHILENO DE PARASITOLOGIA 1984; 39:17-9. [PMID: 6441582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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320
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321
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Denekamp J, Stewart FA, Rojas A. Is the outlook grey for WR-2721 as a clinical radioprotector? Int J Radiat Oncol Biol Phys 1983; 9:1247-9. [PMID: 6307942 DOI: 10.1016/0360-3016(83)90194-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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322
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Martínez R, Ahumada C, Contreras MC, Villarroel F, Rojas A, Schenone H. [Chagas' disease in Chile. Rural Sectors. Domiciliary triatomid infestation and Trypanosoma cruzi infection of the vector and mammals of Region I (1982-1983)]. BOLETIN CHILENO DE PARASITOLOGIA 1983; 38:70-2. [PMID: 6428429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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323
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Stewart FA, Rojas A, Denekamp J. Radioprotection of two mouse tumors by WR-2721 in single and fractionated treatments. Int J Radiat Oncol Biol Phys 1983; 9:507-13. [PMID: 6303992 DOI: 10.1016/0360-3016(83)90069-x] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The radioprotective effect of WR-2721 has been studied in two murine tumors using single doses or five daily fractions. Single dose irradiations of the SA FA resulted in a highly variable radio-protective response. In one experiment large protection factors (1.2-2.5) were obtained, with the greatest protection at low X ray doses. In later experiments with the same tumor, there was little or no radioprotection. The Ca MT was significantly protected against single dose irradiation with both 250 mg/kg and 400 mg/kg of the drug. In a five fraction schedule the extent of radioprotection for CA MT was greater than with single X ray doses for the same drug dose per fraction. Tumor protection factors from the present work and from the literature are compared with published protection factors for normal tissues. Significant tumor radioprotection is seen in most studies. The data indicate more variability in the extent of tumor protection for a given drug dose than is seen in normal tissues. Tumor protection is often greatest at low X ray doses which may be a result of preferential protection of the better-oxygenated tumor cells.
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324
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Rojas A, Stewart FA, Denekamp J. Interaction of misonidazole and WR-2721--II. Modification of tumour radiosensitization. Br J Cancer 1983; 47:65-72. [PMID: 6295429 PMCID: PMC2011240 DOI: 10.1038/bjc.1983.8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Two types of mouse tumour have been used to study the radiomodifying actions of Misonidazole (MISO) and WR-2721 when used alone and in combination with each other. Single dose studies were performed in both of the tumours and fractionated studies were performed on the anaplastic carcinoma, CA MT. Radioprotection with WR-2721 was seen in both tumours, being most marked at low X-ray doses. The protection was more obvious and the sensitization by MISO less in the fractionated experiment. The combination of MISO and WR-2721 gave an intermediate response compared with either drug used alone, resulting in some sensitization with single doses and an overall protection with repeated small doses. An interactive toxicity of the 2 drugs was also observed, suggesting an additive effect when assessed in terms of lethality. These studies indicate that the effects of both MISO and WR-2721 are dependent upon the oxygen status of the cells in the tumour, and that MISO can act in an oxygen-mimetic manner to modify the radioprotection observed with WR-2721.
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325
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Dartevelle P, Levasseur P, Rojas A, Pouliquen E, Le Brigand H, Merlier M. [Replacement of the superior vena cava with PTFE prostheses. Apropos of 12 cases]. CHIRURGIE; MEMOIRES DE L'ACADEMIE DE CHIRURGIE 1982; 108:671-7. [PMID: 7166062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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326
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Rojas A, Stewart FA, Denekamp J. Interaction of radiosensitizers and WR-2721. I. Modification of skin radioprotection. Br J Cancer 1982; 45:684-93. [PMID: 6282299 PMCID: PMC2011016 DOI: 10.1038/bjc.1982.109] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
We have studied the radiomodifying action in mouse skin of WR-2721 and misonidazole (MISO) when used alone or in combination. The radioprotection with WR-2721 was drug-dose dependent and highly influenced by the O2 concentration at the time of irradiation. Significant sensitizaton was observed with MISO, especially in air-breathing mice. The combination of WR-2721 and MISO produced a radiation response intermediate between the resistant and sensitive responses to either drug alone. The precise degree of sensitivity was dependent on the relative doses of protector and sensitizer. We have also studied the interaction of both drugs in terms of drug-induced lethality, which showed a clear toxic interaction. The WR-2721 LD50 was reduced by a factor of 1.4 with only 200 mg/kg of MISO. We conclude that the combination of WR-2721 and MISO shows an interaction in terms of drug toxicity and radiation response, such that the radioprotection of skin is reduced or even abolished with low doses of MISO.
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327
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Rojas A, Stewart FA, Denekamp J. Experimental radiotherapy with WR-2721 and misonidazole. Int J Radiat Oncol Biol Phys 1982; 8:527-30. [PMID: 6286547 DOI: 10.1016/0360-3016(82)90676-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The data from a large series of experiments on mouse skin and tumors are summarized. Radioprotection with WR-2721 has been observed in both tumors and normal tissues. The protection factors are generally, but not always, higher for skin than for tumors. The protection observed in skin is greater for mice irradiated breathing air than for those irradiated in oxygen. It is postulated that the different protection factors observed in different normal tissues and tumors may reflect differences in tissue oxygenation levels. The combination of misonidazole and WR-2721 has been studied in terms of the modification of radiosensitivity and also as the modification of lethal toxicity. An interaction has been observed in all aspects. The toxicity of WR-2721 increases in the presence of misonidazole. The WR-2721 radioprotection of both skin and tumors decreases if the sensitizer is added. Likewise the radiosensitization with misonidazole is diminished when WR-2721 is present. These results indicate an interaction at the site of radiation injury and they also demonstrate that WR-2721 can adequately penetrate into hypoxic tumor cells.
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328
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Denekamp J, Michael BD, Rojas A, Stewart FA. Radioprotection of mouse skin by WR-2721: the critical influence of oxygen tension. Int J Radiat Oncol Biol Phys 1982; 8:531-4. [PMID: 6286548 DOI: 10.1016/0360-3016(82)90677-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The epidermal clone assay has been used to study the radioprotective effect of WR-2721 on mouse skin under different conditions of oxygenation and under anoxia. The skin has shown a progressive decrease in sensitivity as the inspired gas was changed from 100% oxygen towards 0% oxygen. Compared with mice breathing 100% oxygen, those breathing air are partially protected. The inspired oxygen concentration to given half the full oxygen effect is 10--12%. The radioprotection observed with 400 mg/kg WR-2721 is markedly dependent on the ambient oxygen concentration. The protection factor is 1.1 or less in mice breathing 5%, 1% of 0% oxygen. Protection is maximal (1.95) in air and in 50% oxygen and diminishes to 1.6 at higher oxygen tensions.
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329
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Schenone H, González H, Schenone H, Rojas A. [Experimental infection of rats with Trypanosoma cruzi by oral route]. BOLETIN CHILENO DE PARASITOLOGIA 1982; 37:2-9. [PMID: 6820285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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330
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Schenone H, Valdés J, Villarroel F, Rojas A. [Procedures for detecting the presence of Triatoma infestans in dwellings]. BOLETIN CHILENO DE PARASITOLOGIA 1982; 37:18-21. [PMID: 6820284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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331
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Correa V, Briceño J, Zúñiga J, Aranda JC, Valdés J, Contreras MC, Schenone H, Villarroel F, Rojas A. [Trypanosoma cruzi infection in domestic animals in rural sections of the IV Region, Chile]. BOLETIN CHILENO DE PARASITOLOGIA 1982; 37:27-8. [PMID: 6820288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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332
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Rodríguez J, Bertoglia J, Gordillo N, Mendoza J, Rojas J, Contreras MC, Schenone H, Villarroel F, Rojas A. [Domicilliary Triatomidae infestation and Trypanosoma cruzi infection in Region III of Atacama, Chile]. BOLETIN CHILENO DE PARASITOLOGIA 1982; 37:29-30. [PMID: 6820289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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333
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Stewart FA, Rojas A. Radioprotection of mouse skin by WR-2721 in single and fractionated treatments. Br J Radiol 1982; 55:42-7. [PMID: 6274467 DOI: 10.1259/0007-1285-55-649-42] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The radioprotective action of WR-2721 on mouse skin has been studied using single doses, two and five fractions. Significant radioprotection was observed with 200-500 mg/kg, in animals breathing air or oxygen at the time of irradiation. The degree of radioprotection increased with increasing dose, and was significantly greater in air than in oxygen, especially at low drug doses. Cumulative drug toxicity limited the fractionated treatments to lower drug doses, but the protection observed was similar to that seen with single doses at the same drug levels. The protection factors observed are lower than many published values for skin, and we conclude that a single protection factor cannot yet be stated for any dose of WR-2721. Local tissue oxygenation may account for some of the discrepancies in different studies.
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334
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Denekamp J, Michael BD, Rojas A, Stewart FA. Thiol radioprotection in vivo: the critical role of tissue oxygen concentration. Br J Radiol 1981; 54:1112-4. [PMID: 6271327 DOI: 10.1259/0007-1285-54-648-1112-c] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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335
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Schenone H, Rojas A, Galdames M, Villarroel F. [Epidemiological aspects of human infections produced by intestinal protozoa and helminths in Chile (1970-1980)]. BOLETIN CHILENO DE PARASITOLOGIA 1981; 36:44-8. [PMID: 7347607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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336
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Schenone H, Rojas A, Alfaro E, Concha L, Aranda R. [Longitudinal study of the persistence of the therapeutic action of nifurtimox and benznidazole in patients with chronic chagas infection]. BOLETIN CHILENO DE PARASITOLOGIA 1981; 36:59-62. [PMID: 6812600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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337
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Hernández A, Schenone H, Subiabre V, Maturana R, Arias B, Alegría S, Saavedra T, Bondi P, Tello P, Villarroel F, Rojas A. [Present prevalence of scabies and pediculosis capitis among public elementary school children from the North Area of Health, metropolitan region, Chile (July-August, 1981)]. BOLETIN CHILENO DE PARASITOLOGIA 1981; 36:56-8. [PMID: 7347609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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338
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Schenone H, Rojas A, Galdames M, Villarroel F, González Hernández E, Cuevas R, Orfali A, Prieto R, Angulo M, Ortega M. [A scope of soil-transmitted human intestinal helminthiasis in Chile (1970-1980) (author's transl)]. BOLETIN CHILENO DE PARASITOLOGIA 1981; 36:9-13. [PMID: 7344716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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339
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Schenone H, Villarroel F, Rojas A, Alfaro E. [Biological and ecological factors in the epidemiology of Chagas' disease in Chile (author's transl)]. BOLETIN CHILENO DE PARASITOLOGIA 1980; 35:42-54. [PMID: 6797447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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340
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Schenone H, Villarroel F, Rojas A, Carrasco J. [A comparative study of the yield of three methods for detecting the presence of Triatoma infestans in infested dwellings (author's transl)]. BOLETIN CHILENO DE PARASITOLOGIA 1979; 34:7-12. [PMID: 395960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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341
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Pumarino H, Generini G, Rojas A, del Pozo D, Emparanza E. [Urinary excretion of 4hydroxy-3-methoxymandelic acid (vma) in essential hypertension and neuroblastoma (author's transl)]. Rev Med Chil 1977; 105:499-503. [PMID: 918429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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342
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Schenone H, Rojo M, Rojas A, Concha L. [Diurnal and nocturnal positivity of the xenodiagnosis in a patient with chronic chagasic infection and permanent parasitemia (author's transl)]. BOLETIN CHILENO DE PARASITOLOGIA 1977; 32:63-6. [PMID: 416835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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343
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Michelsen H, Contreras P, Bradford I, Rojas A. [Treatment of cushing's disease with cypropheptadine (author's transl)]. Rev Med Chil 1977; 105:380-3. [PMID: 331429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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344
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Devia A, Duerto Z, Rojas A, Sangronis E, Schiavino G, Albornoz AL. Contribution to the study of drug dependence among young people in Caracas. BULLETIN ON NARCOTICS 1976; 28:45-53. [PMID: 1051624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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345
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Contreras P, Pumarino H, Rojas A, Alliende I. [Osteomalacia secondary to chronic metabolic acidosis (author's transl)]. Rev Med Chil 1976; 104:626-33. [PMID: 1021866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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346
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Olivari A, Pradier R, Feierstein J, Guardo A, Glait H, Rojas A. Cell-mediated immune response in head and neck cancer patients. J Surg Oncol 1976; 8:287-94. [PMID: 781404 DOI: 10.1002/jso.2930080405] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The immune reactivity of 100 head and neck cancer patients was studied by means of DNCB, candidine, blastic transformation with PHA, and lymphocyte counts. DNCB reactivity was strong in only 21% of the population and was found impaired in patients with advanced primitive tumors, with more than one primitive tumor, and in patients after radiation. Candidine reactivity was impaired in bigger primitive tumors, positive nodes, and advanced stages, as well as in postradiation patients. Blastic transformation was significantly worse in patients over 70 years and tended to be lower in patients with more than one primitive tumor. Good blastic transformation was also lowered in postradiation patients.
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347
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Goihman-Yahr M, Ulrich M, Noya-León A, Rojas A, Convit J. Dermal exudate macrophages: induction in dermal chambers and response to lymphokines. INTERNATIONAL JOURNAL OF LEPROSY AND OTHER MYCOBACTERIAL DISEASES : OFFICIAL ORGAN OF THE INTERNATIONAL LEPROSY ASSOCIATION 1976; 44:227. [PMID: 945237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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348
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Goihman-Yahr M, Ulrich M, Noya-León A, Rojas A, Convit J. Dermal exudate macrophages. Induction in dermal chambers and response to lymphokines. Clin Exp Immunol 1975; 22:359-63. [PMID: 1212821 PMCID: PMC1538292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Chambers were implanted in the dorsum of guinea-pigs at the dermal-subcutaneous junction. Exudates were induced and harvested. Macrophages obtained were able to migrate in vitro. If procured from sensitized donors, macrophage migration was inhibited by the corresponding antigen. Dermal exudate macrophages are therefore subject to the effect of lymphokines. The chamber model may be useful for in vivo studies of cell to cell and cell-parasite interactions.
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349
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Schenone H, Concha L, Aranda R, Rojas A, Alfaro E, Knierim F. [Chemotherapeutic activity of a nitroimidazolacetamide compound in chronic chagasic infection (author's transl)]. BOLETIN CHILENO DE PARASITOLOGIA 1975; 30:91-4. [PMID: 813747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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350
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Lolić M, Schenone H, Saavedra T, Banda R, Villarroel F, Rojo M, Subiabre V, Arias B, Rojas A, Vicent P, Grinspun M, Sudy E, Canello J, Sepúlveda A, Salas L. [Present prevalence of scables and pediculosis capitis among public primary school children in Santiago, Chile (June-July, 1975) (author's transl)]. BOLETIN CHILENO DE PARASITOLOGIA 1975; 30:50-3. [PMID: 1212280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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