experiments in parabiosis

1
146 Bourne had with Howard, the prison reformer, who had expressed himself as displeased with the condition of the wards. Later we find in the note on C. L. Parker, one of the surgeons (M.R.C.S. 1834), that on one evening- " I (Bishop ITobhouse) invited Mr. Lewes Parker, a leading Oxford surgeon, who had lately shewn his skill in the treatment of the venerable President of Magdalen College, Dr. Routh, who had been bitten by his gardener in a fit of madness." The date of this tragedy is not given, but since Parker died in 1848 it is evident that his treatment must have been successful, for Dr. Routh died in his hundredth year in 1855. The nursing staff, though not always as efficient as it should have been even in the eighteenth century, must have been cheered by the following incident which reflects gravely on the medical staff as well. The Oxford Journcrl, of Dec. 13th, 1777, reports- " On Monday last died in our Infirmary, Martha Jewell, a young woman admitted about five weeks ago, under Pretence of being troubled with a Dropsical Disorder, some hours before whose death, upon examining the Girl’s Box under her bed, a female child was found wrapped up in a quilted petticoat, of which it appeared she had been privately delivered .... From Circumstances upon Examination before the Inquest it appeared that she had been delivered eleven days before her death." This book should be read by every Oxford medical graduate ; moreover, anybody who cares for the past history, not only of medicine, but also of varied aspects of social life, will find vivid pictures within Dr. Gibson’s carefully written pages. EXPERIMENTS IN PARABIOSIS. ARTIFICIAL union of two individual animals has been used from time to time in the study of various pathological problems, but only in the last few years has any attempt been made to employ this method in the elucidation of the various endocrine gland inter-relationships. A considerable amount of work has now been done and the results are of interest, even though it would seem that this method of investigation is not likely to lead to any very striking results in problems of this sort. The method of producing experimental parabiosis consists in uniting or grafting two animals of the same species, generally white rats, so that interchange can take place between the circulating fluids of the two organisms. This is usually done either by musculo-cutaneous or peritoneo- cutaneous suture. The condition is sometimes known as symbiotic grafting or, more simply, the animals joined may be referred to as a Siamese pair. Several groups of workers have attacked the problems of endocrine inter-relationship by this means, the favourite experiment being by union of animals of different sex. There has been general agreement as to ’’ the findings in such experiments, but a considerable difference of opinion as to their interpretation. Changes occur almost universally in the sex and associated glands. H. Matsuyama, a Japanese investigator, was the first to study this aspect of parabiosis.l Employing Siamese pairs of different sex he noted invariably that degenerative changes occurred in the sex glands of both male and female after a short time. These changes were shortly followed by changes in the adrenals, pituitary and mammary glands. He was inclined to consider that all changes followed a primary disturbance in the sex glands, the result of an antagonism between the hormones of the testicles and ovaries. He regarded the condition as one of reciprocal auto-castration, and thought this view was confirmed by the fact that the changes in the other glands mentioned were the same as those found in castrated animals. Although Matsuyama’s findings have been confirmed by most subsequent workers, his conclusions have been the subject of considerable criticism, and none of his critics agrees with the view that the changes found 1 Frankfurter Zeitschrift für Pathologie, vol. xxv., 1921. are the result of antagonism between the hormones of the sex glands. The most popular view is that the changes result from a mutual intoxication between tht internal metabolisms of the two organisms, and an not specifically related to the sex hormones. The latest experimental work of G. Pighini and M. de Paoli in Italy seems to confirm this.2 They have carried out a number of parabiotic experiments with male and female pairs, and they found a very marked reaction to parabiosis almost immediately after operation, a reaction which rather suggested an acntt and mutual intoxication of the nervous system of the pair. This was apparently modified later by some degree of mutual immunisation, though the latter was insufficient to prevent emaciation and death. Intoxication was less obvious in pairs operated oe when very young, in the first two months of life, and in those born of the same litter, but it was always accentuated when the members of the pair were old or of different families. Pighini and Paoli’s anatomico- pathological findings corresponded with those of Matsuyama. The post-mortem changes found in the glands of internal secretion were well marked. There was a general tendency to degeneration and atrophy, first seen in the thymus, then in the sex glands, and later in the pituitary, thyroid, and adrenals. The changes found varied in proportion to the toxic reaction to parabiosis. These facts are certainly more readily explained on the hypothesis of a mutual intoxication of internal metabolisms than on a primary and specific antagonism between the sex hormones. BVE greatly regret to inform our readers that Sir Ernest Hodder-Williams, our Chairman, was taken seriously ill last week. At the time of going to press a position of slight improvement was being maintained. INDEX TO "THE LANCET," VOL. II., 1926. THE Index and Title-page to Vol. II., 192fi, which was completed with the issue of Dec. 25th, is now in preparation. A copy will be sent gratis to subscribers on receipt of a post-card addressed to the Manager of THE LANCET, 1, Bedford-street, Strand, W.C. 2. Sub- scribers who have not already indicated their desire to receive Indexes regularly as published should do so now. 2 Medical Journal and Record, Sept. 15th and Oct. 6th, 1926. FELLOWSHIP OF MEDICINE AND POST-GRADDATL MEDICAL ASSOCIATION.—The Fellowship has arranged clinical demonstrations in Ophthalmology at the Royal Eye Hospital, Southwark, by Mr. Letchworth (Jan. 17th). Mr. Griffith (Jan. 19th), Mr. MacCaHan (Jan. 20th), and Mr. Dorrell (Jan. 21st) ; they will be held at 3 P.M. On .Tan. 19th Mr. Duncan Fitzwilliams will give a special demonstration in the wards at St. Mary’s Hospital at 2 P.M. All these demonstrations are open to members of the medical profession without fee. A comprehensive course in venereal diseases will be given at the London Lock Hospital from Jan. 31st to Feb. 27th. Also beginning on Jan. 31st there will be a four weeks’ course at the St. John’s Hospital for Diseases of the Skin, consisting of instruction in the out-patient department and bi-weekly lectures. t’lasses in pathology can be arranged. From Feb. 7th to lUth an all-day course in Diseases of Children will he held, in which the Paddington Green Children’s Hospital and the Victoria Hospital are participating. The Royal Northern Hospital is holding a one week’s course for general practitioners from Feb. 21st: no fee will be charged. The Fellowship can accommodate post-graduates with practical courses in anaesthetics and courses in obstetrics, and can arrange for clinical assistant ships at the Samaritan Hospital for Women. Syllabus1i6 of the Special Courses and copies of the programme of the General Course and of the Post-Graduate Medical Journal may be had from the Secretary of the Fellowship at 1, Wimpole-street, London, W. 1.

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Page 1: EXPERIMENTS IN PARABIOSIS

146

Bourne had with Howard, the prison reformer, whohad expressed himself as displeased with the conditionof the wards. Later we find in the note on C. L.Parker, one of the surgeons (M.R.C.S. 1834), that onone evening-

" I (Bishop ITobhouse) invited Mr. Lewes Parker, a

leading Oxford surgeon, who had lately shewn his skill inthe treatment of the venerable President of MagdalenCollege, Dr. Routh, who had been bitten by his gardener ina fit of madness."

The date of this tragedy is not given, but sinceParker died in 1848 it is evident that his treatmentmust have been successful, for Dr. Routh died inhis hundredth year in 1855. The nursing staff,though not always as efficient as it should have beeneven in the eighteenth century, must have been cheeredby the following incident which reflects gravely onthe medical staff as well. The Oxford Journcrl, ofDec. 13th, 1777, reports-

" On Monday last died in our Infirmary, Martha Jewell,a young woman admitted about five weeks ago, underPretence of being troubled with a Dropsical Disorder, somehours before whose death, upon examining the Girl’s Boxunder her bed, a female child was found wrapped up in aquilted petticoat, of which it appeared she had been privatelydelivered .... From Circumstances upon Examinationbefore the Inquest it appeared that she had been deliveredeleven days before her death."

This book should be read by every Oxford medical graduate ; moreover, anybody who cares for the pasthistory, not only of medicine, but also of varied aspectsof social life, will find vivid pictures within Dr.Gibson’s carefully written pages.

EXPERIMENTS IN PARABIOSIS.

ARTIFICIAL union of two individual animals hasbeen used from time to time in the study of variouspathological problems, but only in the last few yearshas any attempt been made to employ this methodin the elucidation of the various endocrine glandinter-relationships. A considerable amount of workhas now been done and the results are of interest,even though it would seem that this method ofinvestigation is not likely to lead to any very strikingresults in problems of this sort. The method ofproducing experimental parabiosis consists in unitingor grafting two animals of the same species, generallywhite rats, so that interchange can take place betweenthe circulating fluids of the two organisms. This isusually done either by musculo-cutaneous or peritoneo-cutaneous suture. The condition is sometimes known

as symbiotic grafting or, more simply, the animalsjoined may be referred to as a Siamese pair. Severalgroups of workers have attacked the problems ofendocrine inter-relationship by this means, thefavourite experiment being by union of animals ofdifferent sex. There has been general agreement as to ’’

the findings in such experiments, but a considerabledifference of opinion as to their interpretation.Changes occur almost universally in the sex andassociated glands. H. Matsuyama, a Japaneseinvestigator, was the first to study this aspect of

parabiosis.l Employing Siamese pairs of differentsex he noted invariably that degenerative changesoccurred in the sex glands of both male and femaleafter a short time. These changes were shortlyfollowed by changes in the adrenals, pituitary andmammary glands. He was inclined to consider thatall changes followed a primary disturbance in thesex glands, the result of an antagonism between thehormones of the testicles and ovaries. He regardedthe condition as one of reciprocal auto-castration, andthought this view was confirmed by the fact that thechanges in the other glands mentioned were the sameas those found in castrated animals. AlthoughMatsuyama’s findings have been confirmed by mostsubsequent workers, his conclusions have been thesubject of considerable criticism, and none of hiscritics agrees with the view that the changes found

1 Frankfurter Zeitschrift für Pathologie, vol. xxv., 1921.

are the result of antagonism between the hormones ofthe sex glands. The most popular view is that thechanges result from a mutual intoxication between thtinternal metabolisms of the two organisms, and annot specifically related to the sex hormones. Thelatest experimental work of G. Pighini and M. dePaoli in Italy seems to confirm this.2 They havecarried out a number of parabiotic experiments withmale and female pairs, and they found a very markedreaction to parabiosis almost immediately afteroperation, a reaction which rather suggested an acnttand mutual intoxication of the nervous system ofthe pair. This was apparently modified later bysome degree of mutual immunisation, though thelatter was insufficient to prevent emaciation and death.Intoxication was less obvious in pairs operated oewhen very young, in the first two months of life, andin those born of the same litter, but it was alwaysaccentuated when the members of the pair were oldor of different families. Pighini and Paoli’s anatomico-pathological findings corresponded with those ofMatsuyama. The post-mortem changes found in theglands of internal secretion were well marked. Therewas a general tendency to degeneration and atrophy,first seen in the thymus, then in the sex glands, andlater in the pituitary, thyroid, and adrenals. Thechanges found varied in proportion to the toxicreaction to parabiosis. These facts are certainlymore readily explained on the hypothesis of a mutualintoxication of internal metabolisms than on a primaryand specific antagonism between the sex hormones.

BVE greatly regret to inform our readers that SirErnest Hodder-Williams, our Chairman, was takenseriously ill last week. At the time of going topress a position of slight improvement was beingmaintained. -

INDEX TO "THE LANCET,"VOL. II., 1926.

THE Index and Title-page to Vol. II., 192fi, whichwas completed with the issue of Dec. 25th, is now inpreparation. A copy will be sent gratis to subscriberson receipt of a post-card addressed to the Manager ofTHE LANCET, 1, Bedford-street, Strand, W.C. 2. Sub-scribers who have not already indicated their desireto receive Indexes regularly as published should doso now.

2 Medical Journal and Record, Sept. 15th and Oct. 6th, 1926.

FELLOWSHIP OF MEDICINE AND POST-GRADDATLMEDICAL ASSOCIATION.—The Fellowship has arrangedclinical demonstrations in Ophthalmology at the RoyalEye Hospital, Southwark, by Mr. Letchworth (Jan. 17th).Mr. Griffith (Jan. 19th), Mr. MacCaHan (Jan. 20th), andMr. Dorrell (Jan. 21st) ; they will be held at 3 P.M. On.Tan. 19th Mr. Duncan Fitzwilliams will give a specialdemonstration in the wards at St. Mary’s Hospital at2 P.M. All these demonstrations are open to members ofthe medical profession without fee. A comprehensivecourse in venereal diseases will be given at the LondonLock Hospital from Jan. 31st to Feb. 27th. Also beginningon Jan. 31st there will be a four weeks’ course at the St.John’s Hospital for Diseases of the Skin, consisting ofinstruction in the out-patient department and bi-weeklylectures. t’lasses in pathology can be arranged. FromFeb. 7th to lUth an all-day course in Diseases of Childrenwill he held, in which the Paddington Green Children’sHospital and the Victoria Hospital are participating.The Royal Northern Hospital is holding a one week’scourse for general practitioners from Feb. 21st: no feewill be charged. The Fellowship can accommodatepost-graduates with practical courses in anaesthetics andcourses in obstetrics, and can arrange for clinical assistantships at the Samaritan Hospital for Women. Syllabus1i6of the Special Courses and copies of the programme of theGeneral Course and of the Post-Graduate Medical Journalmay be had from the Secretary of the Fellowship at

1, Wimpole-street, London, W. 1.