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DMSO : Biological Actions of Dimethyl Sulfoxide DMSO - New York Academy of Sciences PDF

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Preview DMSO : Biological Actions of Dimethyl Sulfoxide DMSO - New York Academy of Sciences

ANNALS OF VOLUME 243 THE NEW YORK ACADEMY OF SCIENCES BIOLOGICAL ACTIONS OF DIMETHYL SULFOXIDE StanleyW.Jacob Robert Herschler PUBLISHED BY THE NEW YORK ACADEMY OF SCIENCES ANYAA9 243 1-508 (1975) ^ \ / i THENEW YORKACADEMY OF SCIENCES (Foundedin 1817) BOARDOFGOVERNORS, 1975 PHILIP FEIGELSON,President PHILIP SIEKEVITZ,President-FAect HonoraryChairmanoftheBoardofGovernors BORISPREGEL HonoraryLife Governors MI.AB.RLGAASRKEOTWIMTEZAD IRVINGJ. SELIKOFF H.CHRIBSOTRIINSEPRREEIGLELLY HERMANCOHEN Vice-Presidents SEYMOURMELMAN JOELL.LEBOWITZ ETHELTOBACH RecordingSecretary Treasurer CorrespondingSecretary PAULMILVY GORDON YBILLARD GEORGE FUJIMOTO I. ElectedGovernors-at-Large 1973-1975 CHARLOTTE FRIEND SIDNEYG. ROTH THOMASC. KAVANAGH 1974-1976 MARIEM. DALY RENE DUBOS HERBERTJ. KAYDEN 1975-1977 JOHNJ. BURNS ALLAN GEWIRTZ VIRGINIAS. SEXTON EK.ECNUNYELTEHRWHAADMEMTOHNODMPSON PastPrLeLsiOdeYnDtsM(OGoTveZrnors) MINN.OHREUNTRSYUTMSOUSIS SERGEA. KORFF JACOBFELD Counselorsto theBoardofGovernors FinancialCounselors BudgetCounselor LegalCounselor MFRAETDTEHREIWCKA.ROSTSAEHNLHAUS GEORGEB. DAETZ EDWARDD. BURNS B. ANNALS OF THE NEW YORK ACADEMY OF SCIENCES Volume 243 EDITORIAL STAFF Executive Editor BILL BOLAND Associate Editors ^cAp^^ ANNE CAHILL JONAS ROSENTHAL i&n Center information -r -.hnirai ^"The*«e company 37 /\ Street ANNALS OF THE NEW YORK ACADE^Yjgj^SfJ},^N®:S^2-9l^^ ^ Volume 243 ' January27, 1975 BIOLOGICAL ACTIONS OF DIMETHYL SULFOXIDE* _^ Stanley W. Jacob and Robert Herschl^r J rConfferencerChuairman \[i\\\ f^^'B-^ ?^. ' 1\9^i75^ '^ LIBRARY CONTENTS Opening Remarks. By Chauncey D. Leake 5 Part I. Mechanismof Actionof Dimethyl Sulfoxide Pharmacologicand BiochemicalConsiderationsofDimethylSulfoxide. By DonC. Wood and Julianne Wood 7 Physical Properties ofDimethyl Sulfoxide and its Function in Biological Systems. By H. Harry Szmant 20 InfluenceofNonionic Organic Solutes on Various ReactionsofEnergyConservation and Utilization. By Thomas E. Conover 24 EffectsofDimethyl Sulfoxide on Subunit Proteins. By Thomas R. Henderson, Rogene F. Henderson, andJ. LyndalYork 38 TheEffectofDimethyl Sulfoxideon a Lysosomal Membrane. By DonaldW. Mischand Margaret S. Misch 54 Specific ModificationsoftheNa". K"-Dependent AdenosineTriphosphataseby Dimethyl Sulfoxide. ByJoseph D. Robinson 60 Altered Mitogenic Responsiveness of Chronic Leukemic Lymphocytes and Normal Human LymphocytesTreatedwith DimethylSulfoxide. ByAnthonyJ. Dennisand Henry E. Wilson 73 Cell-Mediated Immunity: Its Modulation by Dimethyl Sulfoxide. By Harry Bartfeld AND Andrew Goldstein 81 Antiarthritic and Antithrombotic Effects of Topically Applied Dimethyl Sulfoxide. By PeterGorogand Iren B. Kovacs 91 Part II: Toxicology, Fate, and Metabolism ToxicityofDimethylSulfoxide, AloneandinCombination. By LionelF. Rubin 98 Biological Effects of the Metabolites of Dimethyl Sulfoxide. By J. J. Kocsis, S. HarkAWAY,andR.Snyder 104 Pharmacological Effects of Dimethyl Sulfoxide on the Mammalian Myocardium. B\ Marshal ShlaferandArvland M. Karow,Jr 110 The Influence of Dimethyl Sulfoxide on Cellular Ultrastructure and Cytochemistry. By Edmund B. Sandborn, HeatherStephens, and Moise Bendayan 122 Metabolism and Excretion of Dimethyl Sulfoxide in Cows and Calves after Topical and Parenteral Application. By J. Tiews, E. Scharrer, N. Harre, L. Flogel, and W. Jochle ' 139 The Penetration and Clearance of Dimethyl Sulfoxide from the Rat Eye After Topical Application. By W. J. Weaver, R. V. Hill, F. S. Weber, andS. W.Jacob 151 *Thisseriesofpapersisthe resultofaconferenceentitledConferenceon Biological ActionsofDimethyl Sulfoxide,heldbvTheNewYorkAcademyofSciencesonJanuary9, 10.and 11, 1974. PartIII. Effectsof Dimettiyl SulfoxideonTumorSystems Stimulation by Dimethyl Sulfoxide of Erythroid DiflFerentiation and Hemoglobin Syn- thesis in Murine Virus-Induced Leukemic Cells. By Charlotte Friend and William Scher 155 EffectofDimethyl Sulfoxideand Dimethylformamideon theGrowth and Morphologyof TumorCells. Bv E. Borenfreund, M.Steinglass,G. Korngold,andA. Bendich '. 164 Studies on the Intracisternal A-Type Particlesin Mouse PlasmaTumorCells: Induction ofMaturation ofthe Particles. ByS. E. Stewart, G. Kasnic,Jr.,C. Urbanski, M. Myers, andT. Sreevalsan 172 Effect of Dimethyl Sulfoxide on the Hepatic Disposition of Chemical Carcinogens. Bv Walter G. Levine '.. 185 PotentiationofAntineoplasticCompoundsbyOral DimethylSulfoxideinTumor-Bearing Rats. By Joel Warren, Miriam R. Sacksteder, Harriet Jarosz, Bruce Wasserman, and Peter E. Andreotti 194 Studies on the Modifying Effect of Dimethyl Sulfoxide and Other Chemicals on Experi- mentalSkinTumor Induction. By FrejStenbackandHumbertoGarcia 209 Part IV. Dimethyl Sulfoxidein Agriculture Fate and Metabolism of Dimethyl Sulfoxide in Agricultural Crops. By Bernard C. Smale, NeilJ. Lasater,and BruceT. Hunter 228 Accumulation and Persistence of Sulfur^"^ in Peach Foliage and Fruit Sprayed with Ra- diolabeled Dimethyl Sulfoxide. By Harry L. Keil 237 Use of Dimethyl Sulfoxide to Control Aflatoxin Production. Bv George A. Bean and George W. Rambo .' 238 PartV. Dimethyl Sulfoxide: Basic Considerations Current Concepts Concerning Radioprotective and Cryoprotective Properties of Dimethyl SulfoxideinCellularSystems. By M.J.Ashwood-Smith 246 The Effect of Dimethyl Sulfoxideon Forelimb Regeneration ofthe Adult Newt, Triturus viridescens. ByGeraldG. Slattery andAnthonyJ.Schmidt 257 In vivo and in vitro Effects ofDimethyl Sulfoxideon Streptomycin-Sensitive and-Resis- tant Escherichia coli. By William E. Feldman, James D. Punch, and PatriciaC. Holden 269 The Effect of Dimethyl Sulfoxide on Pneumocystis carinii. By John W. Smith and WalterT. Hughes 278 The Effects of Dimethyl Sulfoxide on Neurite Development in vitro. By Fred Jerrold Roisen 279 Dimethyl Sulfoxide: A Tool in the Study of Sperm Motility Control. By Leonard Nelson 297 Discussion Paper: Dimethyl Sulfoxide as a Cryoprotective Agent for Platelet Pres- ervationby Freezing. By MarioG. Baldini 306 Part VI. Effectsof Dimethyl Sulfoxidein LowerAnimal Models Production ofInterferon in theWhite Mouseby DimethylSulfoxide. ByMichaelKunze 308 OrallyAdministeredDimethylSulfoxide: ItsEffectsonBloodConcentrationsonSalicylic Acid, Sulfanilamide, and Warfarin. ByG. Thomas Passananti,CarolA. Shively, and Elliot S. Vesell 311 A Comparison ofGlycerol and Dimethyl Sulfoxide as Cryoprotective Agents for an Ex- perimentalTumor: A PilotStudy. ByWilliam P.Graham, III 317 Effect of Dimethyl Sulfoxide and Hydrogen Peroxide on Tissue Gas Tensions. By M. Bert Myers andWilliam Donovan 320 The Effect of Dimethyl Sulfoxide on Hypothalamic-Pituitary-Adrenal Functions in the Rat.ByJohnP. AllenandCatherine F.Allen 325 PartVII. Effectsof Dimethyl SulfoxideontheCentral NervousSystem The Effect of Dimethyl Sulfoxide on the Neuronal Excitability and Cholinergic Trans- mission in AplysiaGanglion Cells. By Masashi Sawada and MakotoSato 337 Enhancement of Resistance ofGlial Cells by Dimethyl Sulfoxide against Sonic Disrup- tion. By Ramon Lim andSean Mullan 358 Dimethyl Sulfoxide in Central Nervous System Trauma. By J. C. de la Torre, H. M. Kawanaga, D. W. Rowed, C. M. Johnson, D. J. Goode, K. Kajihara, and S. Mullan 362 , PartVIII. DimethylSulfoxide:Clinical Concepts Design ofTherapeuticTrials for Dimethyl Sulfoxide. ByThomasG. Kantor 390 The Present and Potential RoleofDimethyl Sulfoxidein ConnectiveTissueDisorders. By John Baum 391 Discussion Paper: Methodology and Techniques in the Evaluation ofDimethyl Sulfoxide forConnectiveTissue Disorders. By RaulFleischmajer 393 Dimethyl SulfoxideTherapy in Various Dermatological Disorders. Bv LazaroSehtman 395 ; Experimental and Clinical Evaluation ofTopical DimethylSulfoxidein Venous Disorders ofthe Extremities.ByA. Kappert 403 DimethylSulfoxideTherapyinChronicSkin Ulcers.By Rene Miranda-Tirado 408 Dimethyl Sulfoxide Therapy as Toxicity-Reducing Agent and Potentiator ofCyclophos- phamide in the Treatment of Different Types ofCancer. By Jorge Cornejo Gar- RiDO and Raul Escobar Lagos 412 DimethylSulfoxideTherapyin SevereRetardationin MongoloidChildren. By ManuelJ. AspiLLAGA, Ghislaine Morizon, Isabel Avendano, Mila Sanchez, and Lucila Capdevile 421 Dimethyl Sulfoxide Therapy in Nonmongoloid Infantile Oligophrenia. By Ana Giller AND Maria E. M. de Bernadou 432 Oral Dimethyl Sulfoxide in Mental Retardation. By Jeanne Gabourie, Janis W. Becker, Barbara Bateman, Michael Dunn, andStanleyJacob 449 Dimethyl SulfoxideTherapyin Bronchiolitis. ByAristidesZuniga, Rodolfo Burdach, AND Santiago Rubio 460 Dimethyl Sulfoxide Therapy in Subjective Tinnitus of Unknown Origin. By Aristides ZunigaCaro 468 Evaluation of Dimethyl Sulfoxide Therapy in Chronic Respiratory Insufficiency of BronchopulmonaryOrigin. ByRenato EulufI Marin 475 Dimethyl Sulfoxidein theTreatmentofRetinal Disease. By RobertV. Hill 485 Dimethyl SulfoxideTherapy inSterility DuetoTubalObstruction. By HugoVenegas .... 494 Experiencein the UseofDimethyl Sulfoxidein the DiseasesoftheSupporting MotorAp- paratus and General Suppurative Surgery. By Michael B. Dubinsky and Andrew A. Skager 497 The HumanToxicologyofDimethyl Sulfoxide. By Richard D. Brobyn 500 SummaryoftheDimethylSulfoxideConference. ByArthur L. Scherbel 510 y f^^A ^%3fe^ ^;^-^ NOTE TO READER DMSO Although the abbreviation is not acorrectdefinition,wedecidedtouseit throughout this monograph, simply because dimethyl sulfoxide has been generally known as DMSO for some time, and we felt that to introduce a more correct but less well-known designation, such as MczSO, might produce some confusion. We have, however, used the full term dimethyl sulfoxidein the titlesofallpapers, andof the monograph itself, in order to further the conceptofemploying the full chemical nameforbiological agentsor substances. StanleyW. Jacoband Robert Herschler Thismonograph wasaidedby contributionsfrom: Acoustical and FireproofingCompany Mrs. Elizabeth Kinsman Portland, Oregon Portland, Oregon Amato Brothers Fred Meyer Foundation Portland, Oregon Portland, Oregon Mr. Thomas Autzen Mrs. EleanorOoten TheAutzen Foundation Oregon City, Oregon Portland, Oregon Mr. William J. Polits Mrs. Eleanor H. Cole Portland, Oregon NewYork, NewYork Mrs. Harrison Ring Mrs. Eunice L. Gaido Portland, Oregon Conroe, Texas Miss Mozelle M. Wilson JohnC. Higgins Foundation Portland, Oregon Portland, Oregon ^ OPENING REMARKS Chauncey D. Leake UniversityofCalifornia San Francisco, California94143 This is the third international conference convened during the past decade on thatremarkablesubstance, dimethyl sulfoxide(DMSO). Thefirst was a comprehen- sive conference, organized by The New York Academy of Sciences in 1966, under the direction of Drs. Stanley Jacob and Edward E. Rosenbaum, of the University ofOregon. These keen clinicians had discovered the extraordinarily useful poten- DMSO tial of inthetreatmentofvariouspainful pathologicalconditions. The second wasconvened in Viennain 1966, under the auspicesofSchering A. G. ofWest Berlin. Organized under the skilled direction ofDr. Gerhard Laudahn, this DMSO second conferencedealtlargely with clinical reports. The third conference on DMSO, now convening here, was again arranged by Dr. Stanley Jacob. This is to be oriented toward broad biological and clinical applica- tions of the demonstrated and verified properties of DMSO. It will also include reportson its clinical usefulness. In the decade since the first hesitant reports on DMSO came from Dr. Jacob and his colleagues, there have been many thousands ofpublished reports on its bio- logical actions and its clinical usefulness in human and veterinary medicine. These reportshavecomefrom allovertheworld. In the U.S.S.R., where bureaucratic control ofdrug preparation and use is even DMSO tighter than in the United States, the clinical usefulness of has been considered sufficiently verified to make it available for use in accordance with the judgmentofphysicians. The mostinformativepublicationson DMSO are: 1. the reports anddiscussions at theNew York Academy ofSciences conference in 1966.^ Thiswas separately summarized by Leake. 2. the reports and discussions ofthe Viennaconferencein 1966.^Thiswas sump- tuously published and distributed by Schering AG ofWest Berlin. The book wasdis- tinguished by fine color photographs, especially ofreversiblelenschangesin theeyes ofsomeexperimental animals. 3. the sharp journalistic book prepared for popular distribution by Pat McGrady."* This gives much detail on the efforts of our Food and Drug Adminis- tration tojustify its rulingson theuseofDMSO. 4. the carefully prepared summaries of the properties, biological actions, and usesofDMSO, edited sowell byJacobandcolleagues.^ 5. the cautious, officialized report of an ad hoc committee of the National AcademyofSciences.® DMSO It is significant that there is a great deal ofpublished material on from all parts of the world. Many are listed in the reports given at the New York Academy of Sciences conference in 1966. The Vienna Symposium listed 395. The volume edited by Jacob and colleagues^ lists over 2,000 references on chemistry, cryobiology, and pharmacology alone. Thereareprobably morethan thisnumberof clinical reports on DMSO in both human and veterinary medicine. The National Academy of Sciences ex cathedra Committee referred specifically to 230 reports, andlisted a"bibliography" ofabout 300. 5 . . 6 Annals NewYork Academy ofSciences It is increasingly difficult to obtain bureaucratic permission to study newdrugs. Itisdifficult forphysicianstousetheirownjudgmentany moreinprescribingdrugs. They are the people licensed by our governments to use drugs in accordance with theirjudgment as to their safety andeffectiveness for individual patients, takinginto account the relation of risk to benefit in the widely differing conditions of their differentpatients. Our Food and Drug Administration, however, operates under the terms of a detailed Act ofour Congress. This Act seems to imply that nodrugis to beused by aphysicianunlessitisdemonstratedto beabsolutely safeand absolutelyeffective. There is no such drug: not even tap water or table salt is absolutely safe and effective. Gaussian distribution inevitably occurs in the response to any chemical agent. Ifenough people areinvolved, it will alwaysbefoundthatwith thesamedose, strictly quantitated on a weight basis, some few persons will show practically no effect, while some few others may show a very strong response, evendeath. Itis the professional responsibility of physicians in actual practice tojudge this relation of risk tobenefitfortheirindividual patients. In my opinion, it is the responsibility of our governments and of our drug in- dustry to furnish physicians with the verified scientific facts about drugs: their chemical composition and physicochemical properties; their ratesofabsorption and distribution; the character and rates oftheir changes in our bodies; their rates and modesofexcretion; theirbiological actions overtherangeoforganizationallevelsof living material (from molecules, subcellular units, cells, organs, tissues, and indi- viduals to societies and ecologies); their toxicities upon single or repeated adminis- tration; the untoward reactions likely to be encountered; and the preparations available. Then it is up to thejudgment oflicensed physicians to decidehow and for whatpurposetheywillusethem. DM With regard to SO, the relevant scientific facts have been clearlyestablished by many competent scientists in many different places. This scientific information on DMSO has been well and widely applied in many appropriateclinical conditions ofanimalsandhumans. Our conference will add furtherdetail to this scientific knowledgeofDMSO and ofits clinical usefulness. As I said when summarizing the first DMSO conference, *'Thewell-known legal principleofres ipsaloquitur might well apply tothesituation involving DMSO." I concluded then, as I do now, that **rarely has anewdrug come so quickly to thejudgment ofthe members ofthe health professions with so much verifiable data from so many parts ofthe world, both experimentally and clinically, asto safety andefficacy." So, let thedeliberations and discussions ofthis Conference result in the wisdom beinggained that may allow DMSO to finds its placein alleviating someofthepains andpathologicaldistresswhichcan afflictusall. References 1 Jacob,S.&E. E. Rosenbaum. 1967.Ann.N.Y.Acad.Sci. 141: 1-671 2. Leake,C.D. 1966.Science152: 1646-1649. 3. Laudahn, G. & K. Gertich. 1966. DMSO Internationales Symposium, 219 pp. Saladruck. Berlin,WestGermany. 4. McGrady, p. 1973. The Persecuted Drug: The Story of DMSO, 372 pp. Doubleday & Company,Inc.GardenCity,N.Y. 5. Jacob, S., E. E. Rosenbaum & D. C. Wood. 1971. Dimethyl-Sulfoxide. Vol. 1. Basic Concepts,479pp. Marcel Dekker.NewYork,N.Y. 6. National Academy of Sciences. 1973. Dimethyl sulfoxide as a therapeutic agent. Report, 119p. Part Mechanism of Action of Dimethyl Sulfoxide I. PHARMACOLOGIC AND BIOCHEMICAL CONSIDERATIONS OF DIMETHYL SULFOXIDE Don C. Wood andJulianneWood Medlab ComputerServices Salt Lake City, Utah84102 I A broad spectrum of the primary pharmacological properties of DMSO have been reported. Concurrently with pharmacologic studies in laboratoryexperimental models, there have been evaluations of its clinical therapeutic efficacy, and an equally broad spectrum offavorable therapeutic claims have also been made. It has been perplexing to all serious students ofthis drug that the basic and clinical studies have produced conflicting reports. Controversial claims, however, are usually associated with the development and refinement ofany new drug. In many respects the case of DMSO is unique, in that it appears to palliate such a large number of different clinical conditions and also to evidence such a wide range of pharmaco- logical properties. As we gain more experience with DMSO, a greater degree of standardization will result, and many ofthe areas ofcontroversy will be resolved. In comparing published reports, the reader should be careful to review comparableex- perimental design, common stages ofdisease in patients, similar dosings, routes of therapy, frequency of therapy, methods of measuring results, and inherent experi- mental error, and so on. Few studies have been reported in which identical models havebeen used bydifferentinvestigators toevaluate DMSO. In addition to experimental design, patient selection, and methodology, other physical or chemical characteristics may affect the results obtained in DMSO studies. These factors often appear unique to DMSO, and may or may not have been published. Some DMSO investigators have "grown up" with a trial-and-error understanding ofthese potential experimental problems. A property ofDMSO that has caused considerable difficulty in the interpretation oflaboratory findings is the degree of ionization it may impose upon the constituents of an aqueous buffer system. If an aqueous phosphate buffer is prepared to a specific pH value, then is subsequently diluted with DMSO, not only will the concentration of buffer change with the dilution, but the pH value will change as well. Ifthe DMSO-buffer mixture is not checkedjust before use, erroneous interpretations ofdata can result. Enzyme activities, metabolic studies, tissue or cell cultures, in vitro microbiology, and nu- merous other test systems could be seriously modified, yielding results that relate simply to a buffer pH change, rather than to an effect of DMSO on the primary physiologicorpharmacologicproperty beingexamined. Investigators have been concerned that enzymes fail to respond in a predictable fashion when mixed with DMSO solutions. There are enzymes that appear to be unaffected by high concentrations of DMSO. Other enzymes are potentiated in catalytic activity. A third group ofenzymes are inhibited in relatively dilute DMSO solutions. Do these studies reflect pH changes or modifications of protein con- formation, or in the case of enzyme inhibition, is the catalytic activity related to chemical changes in functional groups? This very complex matter has been dis- cussedelsewhere.^"* It is known that DMSO is reduced to dimethyl sulfide (DMS) when mixed in vitro with glutathione or cysteine.^ DMSO will interfere with many laboratory procedures commonly used to measure constituents in biological fluids such as DMSO blood glucose, ascorbic acid, and so on.^ The concentration of in the test 7 8 Annals NewYork Academy ofSciences system is important to the degree ofinterference. Most in vivo experiments would probably beunaffected by theseproblems, but manyin vitro studies are affected. Numerous other examples could be sited, with particular reference to pharmacologic and therapeutic studies in clinical testing,in which the DMSO con- centration and frequency of treatment are extremely critical to success. Most clinicians who have had extensive experience with DMSO now have an under- standing of this therapeutic problem. Frequency of treatment and the concentra- DMSO tions of used in clinical evaluations are extremely critical to the results that will be obtained. The fact that some ofthis information is not clear has been one of theimportant factorsleadingtodifferencesin publishedexperimentalfindings. This paper will attempt to bring together not only pharmacological laboratory experimental models, but also some clinical studies which might lend support to a better understanding of DMSO and its action. As one attempts to understand the mechanism ofDMSO in a disease process, one must consider the fact that multiple pharmacological properties can be expressed in a single clinical problem. It is likely that some of the drug characteristics would be favorable in a particular clinical situation, whileother properties mightwork to thepatient'sdisadvantage. MembranePenetration DMSO in varying concentrations has been shown to cross body membranes in animals. The process is reversible. The integrity of most membranes is unaffected; except where extremely concentrated (90-100%) doses of DMSO come into direct contact with the membrane. In clinical therapeutic conditions, such concentration levels would rarely be reached. Exceptionsto the rapid penetration ofthe membrane are nails and the enamel of the teeth, where little penetration, if any, can be demonstrated. Numerous studies on the fate and metabolism of labelled DMSO have confirmed the rapid movement and generalized distribution of the labelled component in nearly every tissue of the body. Extraction and analysis of the label fromvarious tissues showsthepresenceofDMSOoroneofits metabolites.^~*' Klingman^^'^^ mixed dyes, antiperspirants, and steroids with varying concentra- tions of DMSO. He reported enhanced penetration through human skin, as com- pared with controls that did not contain DMSO, and claimed that theenhancement of penetration was not dependent on irreversible damage to the stratum corneum. Maibach and Feldman^'' reported a threefold increase in the penetration of percutaneous steroid when mixed with DMSO. Maximum urinary excretion of testosterone and hydrocortisoneoccurred in man within 36 hoursaftertreatmentof theskin. Sulzberger and colleagues^^ used iron dyes, iodine, and methylene blue as visual DMSO markers ofpenetration following dermal application of dye mixtures. They found in biopsies that there was essentially no penetration ofthe marker below the stratum corneum. The stratum corneum was completely invaded, however. Stroughton^^"^* also transported hydrocortisone and hexachlorophene into the stratum corneum. He found that the deposit remained for as long as 16 days, and was resistanttowashingwith alcoholor soap and water. Perlman and Wolfe^^ found that solutions of allergen of low molecular weight would penetrate intact human skin when mixed with 90% DMSO. Allergens that had molecular weights of more than 3,000 failed to penetrate the skin. Smith and Hegre^° reported, however, that specific antibodies did form in rabbits treated with DMSO dermal applicationsof and bovine serum albumin.

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Most books are stored in the elastic cloud where traffic is expensive. For this reason, we have a limit on daily download.