372 localisation of P.T.H. and P.s.P. was accomplished with the unlabelled antibody enzyme method of Sternberger et al. Ribbons of consecutive thin sections mounted on nickel grids were incubated sequentially with anti-p.T.H. or anti-p.s.p. serum, sheep anti-rabbit-globulin serum, and peroxidase-antiperoxidase complex (a gift of Dr L. A. Sternberger, Edgewood Arsenal, Maryland). The peroxidase was then revealed with diaminobenzidine and hydrogen peroxide in tris buffer.1O Immunoreactive deposit was made electron dense by exposing sections to 2% osmium tetroxide in distilled water. The specificity of immunostaining was checked wun antisera that were cross-absorbed (i.e., absorption of anti-P.T.H. serum with P.T.H. or P.S.P. and of anti-P.S.P. sera with P.S.P. or P.T.H.). incubated with anti-P.T.H. or with anti-p.s.p. allowed us to follow the same cells through several sections and to compare the morphological distribution of immunoreactive P.T.H. and P.s.P.
The studiesof consecutivesemithinsections
As the figure shows, immunofluorescence after the application of anti-p.T.H. and anti-p.s.p. sera is limited to an identical population of cells. Furthermore, the two staining patterns in single cells seem superimposable, with finely granular fluorescence restricted to the cytoplasm of the parenchymal (chief) cells. Electronmicroscopy showed that the electron-dense reaction product was confined to the secretory granules of the chief cells. Positive reactions were completely inhibited when the antisera had been absorbed with the homologous antigens, whereas cross-absorptions did not affect the positive reaction. These observations demonstrate that antigenic sites reacting with anti-p.s.p. and anti-p.T.H. sera are present in the same population of chief cells and within the same subcellular compartment. We conclude that the two major proteins secreted by the parathyroid glands are both contained in the same secretory granules of the chief cells. We thank A. M. Lucini, M. Sidler, P. C. Dee, and H. Chang for
The question whether the word should be "opportunist" or "opportunistic" I leave to the etymologists among your readers. Department of Pathology, University College,
p. 207) and Dr Howie1 sugbetween tuberculosis and bronchial that the association gested carcinoma may be more than fortuitous, and I agree. Many factors seem to initiate neoplasms,2 and the chronic immune irritation generated by tuberculosis and sarcoidosis3 is one of these. Mycobacterial infections in Texas were found to be three times more common among cancer patients than among the local population. 9 of the 65 malignant cases had lung cancer, 7 had lymphomas, and 19 had squamous-cell carcinoma of the head and neck.4 A similar increase in the incidence of malignant tumours was reported in Denmark, among 244 cases of respiratory sarcoidosis. 9 of the 48 patients with tumours had lung cancer, and 6 had lymphomas. Partly because there was less sunlight, only 7 of these had skin
SIR,-Both Dr Sakula (July 22,
cancer.5 Atypical
St. Luke’s Hospital, Guildford, Surrey GU1
Endocrine Unit, Massachusetts General Hospital and Department of Medicine, Harvard Medical School, Boston, Massachusetts, U.S.A.
JOEL F. HABENER JOHN T. POTTS, JR.
PULMONARY TUBERCULOSIS AND BRONCHIAL CARCINOMA
SIR,—Dr Sakula (July 22, p. 207) takes
me to task for my of the word "opportunist" as applied to tuberculosis complicating bronchial carcinoma. Although I confess to trailing my coat in making such a statement, there is ample support for this use of the word opportunist. In a reference cited in my first letter there is the flat statement that "mycobacteria act as opportunistic pathogens in persons with malignant diseases". Smith2states that "opportunist infections result from microorganisms, both traditional pathogens and those that in the and are past might have been considered nonpathogens commonest in patients whose immune responses are compromised"-e.g., those with lung cancer. Gowing3 and a Ciba symposium4 give similar definitions. But, as Gowing3 and also Smith2state, a satisfactory definition is by no means easy to frame and Dr Sakula will find support for this use of the word opportunist in Stedman’s Medical Dictionary.5
use
...
9.
Sternberger, L. A., Hardy, P. H., Jr., Cuculis, J. J., Meyer, H. G. J. Histochem. Cytochem. 1970, 18, 315. Graham, R. C., Karnovsky, M. J. ibid. 1966, 14, 291.
10. 1. Ortbols, D. W., Marr, J. J. Am. Rev. resp. Dis. 1978, 117, 39. 2. Smith, H. Br. med. J. 1973, ii, 107. 3. Gowing, N. in Hodgkin’s Disease (edited by D. Smithers). London, 1973. 4. Wolstenholme, G. E. W., Porter, R. Ciba Foundation Symposium on Systemic Myeoses; p. 15. London, 1968. 5. Stedman’s Medical Dictionary; p. 990. New York, 1976.
3NT
GERALD A. MACGREGOR
MARKER FOR PINEAL TUMOURS?
and may be difficult to idenmarker would be of considerable importance in the diagnosis and monitoring of these lesions. The finding of high melatonin concentrations in the serum of a patient with histologically proven pineocytoma 10 1’ prompted examination of serum from similar patients on the West Midlands Cancer Registry. Sera were assayed for melatonin, chorionic gonadotrophin (H.c.G.) and its subunits, carcinoembryonic antigen, and a-fetoprotein. The five additional patients (three male, two female) were aged 9-72 years (mean 25). Blood-samples were taken at noon from these patients who, 6 months to 12 years previously, had had 4000-5000 rad directed at the pineal, the diagnosis having been confirmed radiologically. Melatonin levels were 183, 131, 142, 182, and 140 pg/ml; normal mid-day values are 20+3 pg/ml (mean ±2 s.D.). In one patient the a-gonadotrophin subunit was not significantly raised at 6.4 µg/l (normal
The studiesof consecutivesemithinsections
As the figure shows, immunofluorescence after the application of anti-p.T.H. and anti-p.s.p. sera is limited to an identical population of cells. Furthermore, the two staining patterns in single cells seem superimposable, with finely granular fluorescence restricted to the cytoplasm of the parenchymal (chief) cells. Electronmicroscopy showed that the electron-dense reaction product was confined to the secretory granules of the chief cells. Positive reactions were completely inhibited when the antisera had been absorbed with the homologous antigens, whereas cross-absorptions did not affect the positive reaction. These observations demonstrate that antigenic sites reacting with anti-p.s.p. and anti-p.T.H. sera are present in the same population of chief cells and within the same subcellular compartment. We conclude that the two major proteins secreted by the parathyroid glands are both contained in the same secretory granules of the chief cells. We thank A. M. Lucini, M. Sidler, P. C. Dee, and H. Chang for
The question whether the word should be "opportunist" or "opportunistic" I leave to the etymologists among your readers. Department of Pathology, University College,
p. 207) and Dr Howie1 sugbetween tuberculosis and bronchial that the association gested carcinoma may be more than fortuitous, and I agree. Many factors seem to initiate neoplasms,2 and the chronic immune irritation generated by tuberculosis and sarcoidosis3 is one of these. Mycobacterial infections in Texas were found to be three times more common among cancer patients than among the local population. 9 of the 65 malignant cases had lung cancer, 7 had lymphomas, and 19 had squamous-cell carcinoma of the head and neck.4 A similar increase in the incidence of malignant tumours was reported in Denmark, among 244 cases of respiratory sarcoidosis. 9 of the 48 patients with tumours had lung cancer, and 6 had lymphomas. Partly because there was less sunlight, only 7 of these had skin
SIR,-Both Dr Sakula (July 22,
cancer.5 Atypical
St. Luke’s Hospital, Guildford, Surrey GU1
Endocrine Unit, Massachusetts General Hospital and Department of Medicine, Harvard Medical School, Boston, Massachusetts, U.S.A.
JOEL F. HABENER JOHN T. POTTS, JR.
PULMONARY TUBERCULOSIS AND BRONCHIAL CARCINOMA
SIR,—Dr Sakula (July 22, p. 207) takes
me to task for my of the word "opportunist" as applied to tuberculosis complicating bronchial carcinoma. Although I confess to trailing my coat in making such a statement, there is ample support for this use of the word opportunist. In a reference cited in my first letter there is the flat statement that "mycobacteria act as opportunistic pathogens in persons with malignant diseases". Smith2states that "opportunist infections result from microorganisms, both traditional pathogens and those that in the and are past might have been considered nonpathogens commonest in patients whose immune responses are compromised"-e.g., those with lung cancer. Gowing3 and a Ciba symposium4 give similar definitions. But, as Gowing3 and also Smith2state, a satisfactory definition is by no means easy to frame and Dr Sakula will find support for this use of the word opportunist in Stedman’s Medical Dictionary.5
use
...
9.
Sternberger, L. A., Hardy, P. H., Jr., Cuculis, J. J., Meyer, H. G. J. Histochem. Cytochem. 1970, 18, 315. Graham, R. C., Karnovsky, M. J. ibid. 1966, 14, 291.
10. 1. Ortbols, D. W., Marr, J. J. Am. Rev. resp. Dis. 1978, 117, 39. 2. Smith, H. Br. med. J. 1973, ii, 107. 3. Gowing, N. in Hodgkin’s Disease (edited by D. Smithers). London, 1973. 4. Wolstenholme, G. E. W., Porter, R. Ciba Foundation Symposium on Systemic Myeoses; p. 15. London, 1968. 5. Stedman’s Medical Dictionary; p. 990. New York, 1976.
3NT
GERALD A. MACGREGOR
MARKER FOR PINEAL TUMOURS?
and may be difficult to idenmarker would be of considerable importance in the diagnosis and monitoring of these lesions. The finding of high melatonin concentrations in the serum of a patient with histologically proven pineocytoma 10 1’ prompted examination of serum from similar patients on the West Midlands Cancer Registry. Sera were assayed for melatonin, chorionic gonadotrophin (H.c.G.) and its subunits, carcinoembryonic antigen, and a-fetoprotein. The five additional patients (three male, two female) were aged 9-72 years (mean 25). Blood-samples were taken at noon from these patients who, 6 months to 12 years previously, had had 4000-5000 rad directed at the pineal, the diagnosis having been confirmed radiologically. Melatonin levels were 183, 131, 142, 182, and 140 pg/ml; normal mid-day values are 20+3 pg/ml (mean ±2 s.D.). In one patient the a-gonadotrophin subunit was not significantly raised at 6.4 µg/l (normal
