Cross-linking of actin to myosin subfragment 1: course of reaction and stoichiometry of products

The cross-linking of actin to myosin subfragment 1 (S-1) with 1-ethyl-3-[3-(dimethyl-amino)propyl]carbodiimide was reexamined by using two cross-linking procedures [Mornet, D., Bertrand, R., Pantel, P., Audemard, E., & Kassab, R. (1981) Nature (London) 292, 301-306; Sutoh, K. (1983) Biochemistry 22, 1579-1585] and two independent methods for quantitating the reaction products. In the first approach, the cross-linked acto-S-1 complexes were cleaved with elastase at the 25K/50K and 50K/22K junctions in S-1. This enabled direct measurements of the cross-linked and un-cross-linked fractions of the 50K and 22K fragments of S-1. We found that in all cases actin was preferentially cross-linked to the 22K fragment and that the overall stoichiometry of the main cross-linked products was that of a 1:1 complex of actin and S-1. In the second approach, actin was cross-linked to tryptically cleaved S-1, and the course of these reactions was monitored by measuring the decay of the free 50K and 20K fragments and the formation of cross-linked products. After selecting the optimal cross-linking procedure and conditions, we determined that the rate of actin cross-linking to the 20K fragment of S-1 was 3-fold faster than the reaction with the 50K peptide. The overall rate of cross-linking actin to S-1 corresponded to the sum of the individual reactions of the 50K and 20K fragments, indicating their mutually exclusive cross-linking to actin. Thus, the reactions with tryptically cleaved S-1 were consistent with the 1:1 stoichiometry of actin and S-1 in the main cross-linked products and verified the preferential cross-linking of actin to the 20K fragment of S-1. These results are discussed in the context of the binding of actin to S-1.

1,25-Dihydroxyvitamin D resistance, rickets, and alopecia

Two unrelated kindreds with four affected children having 1,25-dihydroxyvitamin D resistance, rickets, and alopecia are described. The children exhibited early onset of severe rickets with hypocalcemia, hypophosphatemia, elevated serum alkaline phosphatase levels, and secondary hyperparathyroidism. Radiography showed diffuse demineralization and classic changes of rickets. All affected children had total-body alopecia. Serum levels of 1,25-dihydroxyvitamin D3 were elevated and rose to extremely high values during treatment, with no apparent change in the mineral disorder. However, secondary hyperparathyroidism and hypophosphatemia did remit during treatment despite persistently low calcium levels. Skin biopsy was performed in the parents and affected children in one kindred. Analysis of 1,25-dihydroxyvitamin D3 receptors in cultured fibroblasts indicated apparent normal receptors in the parents and undetectable receptors in both affected children. After long periods of treatment with vitamin D metabolites and mineral replacement, healing took place in the older child in each kindred. These data suggest that the healing occurred spontaneously as the children reached seven to nine years of age rather than as a result of the treatment. The biochemical lesion in these children appeared to be a genetically transmitted defect in the 1,25-dihydroxyvitamin D3 receptor. The mechanisms by which healing was initiated and maintained remain to be elucidated.

Characterization of insulin-like growth factor I receptors on cultured rat bone cells: regulation of receptor concentration by glucocorticoids

A specific receptor for insulin-like growth factor I (IGF-I) has been demonstrated in cultured fetal rat osteoblast-like bone cells. Specific binding of [125I]IGF-I to bone cells incubated at 15 C reached a steady state by 5 h. Half-maximal inhibition of [125I]IGF-I binding by unlabeled IGF-I was observed at 7 ng/ml. Multiplication-stimulating activity, insulin, and proinsulin were less effective than unlabeled IGF-I in competing for receptor occupancy. Scatchard analysis showed a curvilinear plot, with a Ka similar to that observed in human fibroblasts. Incubation of cell monolayers with glucocorticoids resulted in a concentration-dependent increase in [125I]IGF-I binding. This increase in [125I]IGF-I binding was dependent on cell density. After a 2-day exposure to dexamethasone, no increase in binding was observed in sparsely plated cells; however, an increase in binding was observed after 3 days in culture (log phase) and was maximal by 5 days (peak log phase). These data indicate that rat bone cells possess a specific receptor for IGF-I with binding characteristics similar to those reported in human fibroblasts, and that IGF-I receptor concentrations are increased by exposure to glucocorticoids. A role for glucocorticoids and IGF-I in rat bone proliferation is suggested by these findings.

Diminished biparietal diameter and abdominal circumference growth in twins

Forty-three women with uncomplicated twin pregnancies and reliable menstrual dates had serial ultrasonic measurements of the fetal biparietal diameter (BPD) and abdominal circumference. The 25th, 50th, and 75th fetal BPD and abdominal circumference growth percentiles were generated from this normal twin population and compared with those for singletons. A slowing of both BPD and abdominal circumference growth in twins was noted in the third trimester. However, newborn anthropometric data were collected that suggest that the head circumference of twins is comparable to that of singletons. This discrepancy between ultrasonic BPD and neonatal head circumference in predicting head size may possibly be explained by dolichocephaly attributed to uterine crowding. For the antenatal assessment of growth in twins the authors recommend the use of BPD and abdominal circumference charts derived specifically from such uncomplicated twin pregnancies. When the BPD growth is abnormal, the head circumference and abdominal circumference should be measured to assess whether or not fetal growth is normal.

Tryptic digestion of rabbit skeletal myofibrils: an enzymatic probe of myosin cross-bridges

Tryptic digestion of rabbit skeletal myofibrils under physiological ionic strength and pH conditions was used as a probe of cross-bridge interaction with actin in the presence of nucleotides and pyrophosphate. Under rigor conditions, digestion of myofibrils at 24 degrees C results in the formation of 25K, 110K [heavy meromyosin (HMM)], and light meromyosin (LMM) fragments as the main reaction products. Very little if any 50K peptide is generated in such digestions. In the presence of magnesium pyrophosphate, magnesium 5'-adenylyl imidodiphosphate (MgAMPPNP), and MgATP, the main cleavage proceeds at two positions, 25K and 75K from the N-terminal portion of myosin, yielding the 25K, 50K, and 150K species. The relative amounts of the 50K, 110K, and 150K peptides and the rates of myosin heavy-chain digestion in the presence of pyrophosphate and AMPPNP indicate partial dissociation of myosin from actin. Direct centrifugation measurements of the binding of HMM and subfragment 1 (S-1) to actin in myofibrils confirm that cross-bridges partition between attached and detached states in the presence of these ligands. In the presence of MgADP, HMM and S-1 remain attached to actin at 24 degrees C. However, tryptic digestion of myofibrils containing MgADP is consistent with the existence of a mixed population of attached and detached cross-bridges, suggesting that only one head on each myosin molecule is attached to actin. As shown by tryptic digestion of myofibrils and the measurements of HMM and S-1 binding to actin, nucleotide- and pyrophosphate-induced dissociation of cross-bridges is more pronounced at 4 than at 24 degrees C.(ABSTRACT TRUNCATED AT 250 WORDS)

Social status, gonadal state, and the adrenal stress response in the lizard, Anolis carolinensis

Adult males of the small arboreal iguanid lizard, Anolis carolinensis, form social dominance hierarchies when placed in habitats with limited resources. Skin color changes occur during hierarchy formation, most conspicuously in subordinates, who appear darker (more brown) than dominants (more green). Because skin color in this species is under the control of hormones frequently associated with physiological stress, radioimmunoassay of plasma levels of the principal reptilian adrenal steroid, corticosterone, was performed. To examine the influence of gonadal androgen, known to influence the aggression that attends hierarchy formation, lizard pairs were constituted in which one or both members were castrated. Corticosterone levels of intact subordinates were significantly elevated, whereas those of castrated subordinates or dominants showed levels comparable to those of isolates. No significant differences in spermatogenic stage could be detected between intact dominants or subordinates.

Effects of intensive induction chemotherapy for extensive-disease small cell bronchogenic carcinoma in protected environment-prophylactic antibiotic units

Fifty-five patients with extensive-disease small cell bronchogenic carcinoma received three courses of intensive, inpatient, remission induction chemotherapy in (25 patients) or out (30 patients) of protected environment-prophylactic antibiotic (PEPA) units. Chemotherapy consisted of ECHO induction (E = epipodophyllotoxin VP-16-213; C = cyclophosphamide; H = hydroxydaunorubicin; O = Oncovin) and PRIME maintenance (PR = procarbazine; I = ifosfamide; ME = methotrexate). All evaluable patients (22 in the protected environment group and 26 in the control group) had a complete (50 percent in the protected environment group and 54 percent in the control group) or partial (50 percent in the protected environment group and 46 percent in the control group) remission. Median response and survival durations for both treatment groups were similar. The median survival duration of patients with a complete remission favored the protected environment group (16.5 versus 12.67 months; p = 0.20). Two patients (one from each group) are alive and disease-free for more than four years. Myelosuppression was intense and more pronounced in the protected environment group (p less than or equal to 0.01). Infectious complications were less common in patients receiving intravenous prophylactic antibiotics and in those treated with intravenous antibiotics in PEPA units (p less than or equal to 0.04). There were no treatment-related deaths, although treatment might have contributed to the death of three patients in the protected environment group and four in the control group. The administration of intensive ECHO induction chemotherapy to patients with extensive small cell bronchogenic carcinoma produced a high complete remission rate, although there was no significant long-term survival advantage over a program of less intensity. The administration of intravenous prophylactic antibiotics and the use of PEPA units significantly reduced the infectious morbidity of chemotherapy.

Small cell bronchogenic carcinoma: factors associated with pneumonia during chemotherapy

Sixty-five patients with small cell bronchogenic carcinoma were treated with intensive induction chemotherapy and supportive treatment. The clinical course of 43 patients who had pretreatment spirometry and arterial blood gases was studied. Thirteen patients developed pneumonia. Moderate hypoxemia, advanced age, and a low forced expiratory flow 25%-75% were associated with the development of pneumonia. Endobronchial obstruction and neutropenia, other factors associated with infection in cancer patients, appeared to be less important in this patient population.

Synthesis of, and animal experiments with, N-isopropyl-p-123I-iodo-amphetamine (IMP) and 18F-3-deoxy-3-fluoro-D-glucose (3-FDG) as tracers in brain and heart diagnostic studies

For the investigation of brain functions 18F-3-deoxy-3-fluoro-D-glucose (3-FDG) and N-isopropyl-p-123I-iodo-amphetamine (IMP) were synthesized and the course of radioactivity measured in several organs of mice. The results can be summarized as follows: IMP is rapidly extracted from the blood and reaches a value of less than 1% g within the first 15 min; 123I-radioactivity in the lungs shows a maximum of 76%/g as soon as half a minute after injection and decreases with a concomitant increase in the liver and brain; The maximum 123I-uptake in the brain of 11%/g is reached after 30 min and levels off at a constant value of 10%/g; 30 min after injection the brain/blood ratio for IMP is about 14; The time course of 3-FDG in the brain has a maximum of 4.8%/g as soon as 5 min after injection and decreases to a constant value of 3%/g within 1 hr; and Accumulation of 18F- radioactivity in the heart reaches a maximum of 14%/g after 1 hr and is eliminated with a half-life of 300 min. Comparative clinical studies with 3-FDG and 3-0-11C-methyl-D-glucose (CMG) have shown that 3-FDG can be considered as a CMG-analogue and thus can be used for the in-vivo determination of local glucose perfusion and transport rates.

Impact of the timing of triple intrathecal therapy on remission induction in childhood acute lymphoblastic leukemia: a Pediatric Oncology Group study

Five weekly doses of triple intrathecal (IT) chemotherapy (methotrexate, hydrocortisone, cytosine arabinoside) starting on day 1 of treatment were added to systemic induction therapy in a regimen (Arm 3) that was compared to three other regimens (Arms 1, 2, and 4) in which central nervous system (CNS) prophylaxis was initiated after complete marrow remission (CR) was attained. The CR rate for Arm 3 was only 83% as compared to 91-92% for other Arms. The lower CR rate was the result of a significantly higher death rate during induction for patients receiving early CNS prophylaxis (10.6 vs 0.9-3.5%). These differences were only observed in high risk patients as defined in the study. The early death rate was especially high (30%) in Arm 3 for children who were less than 2 years of age. Infection was the primary cause of morbidity and mortality. Severe infection following the initiation of induction therapy was found in 16.7% of patients on Arm 3 vs 1.8-6% on other regimens. Immediate triple IT chemoprophylaxis during induction therapy of acute lymphoblastic leukemia as used in this study appears to be associated with increased susceptibility to infection and this form of CNS prophylaxis has increased hazards of morbidity and mortality in infants and other high risk patients.

Vitamin content of some normal human brain segments

Nicotinates, pantothenates, riboflavin, vitamins B6 and B12' free (acetyl) and total (free and bound) choline, biopterin, thiamin, biotin, methylated and nonmethylated folates in frontal, temporal, precentral, postcentral, and occipital cortex, thalamus, cerebellum, pons, basal ganglia, and substantia nigra were estimated. Nicotinates are significantly more concentrated in basal ganglia and thalamus than pons. Nonmethylated folate content is not significantly varied in brain segments; the pons contains more methylated folate. Riboflavin content is higher in the basal ganglia and temporal cortex than frontal cortex. Biotin is concentrated in pons and basal ganglia. Thiamin concentration is less in the postcentral cortex than the thalamus and substantia nigra. Biopterin is significantly higher in substantia nigra and basal ganglia than the other brain segments. Total choline content is high in substantia nigra, pons, and thalamus; free (acetyl) choline is significantly elevated in basal ganglia. B12 content is less concentrated in the cortex segments. B6 is highly concentrated in the basal ganglia. Pantothenate content is elevated in pons when compared to the various cortex segments and cerebellum.

Vitamin D resistant rickets with alopecia: cultured skin fibroblasts exhibit defective cytoplasmic receptors and unresponsiveness to 1,25(OH)2D3

A new case of vitamin D dependent rickets (Type II) with alopecia in a 5 yr old child is reported. Skin fibroblasts were propagated in culture and analyzed for cytoplasmic 1,25(OH)2D3 receptors. The rachitic cells failed to exhibit specific, high-affinity binding sites by either Scatchard analysis or sucrose density gradient. Furthermore, a rise in 24-hydroxylase activity could not be elicited following incubation of the rachitig cells with 1,25(OH)2D3. Fibroblasts from a non-rachitic child examined in parallel experiments demonstrated high affinity binding sites (Kd = 0.1 nM, Nmax = 33 fmol/100 micrograms DNA) and the induction of 24-hydroxylase activity. The molecular basis of the unresponsiveness of the cells from the rachitic child appears to be due to defective or absent 1,25(OH)2D3 receptors.

Influence of chest radiotherapy in frequency and patterns of chest relapse in disseminated small cell lung carcinoma. A Southwest Oncology Group Study

The value of radiotherapy to the chest (RC) in disseminated small cell lung carcinoma (SCLC) has been questioned. Two protocols for disseminated SCLC from the Southwest Oncology Group (SWOG) have been compared. They were developed four years apart. The first one included radiotherapy (RT), 3000 rad in two weeks, to the primary tumor, mediastinum and supraclavicular areas, while the second one deleted any RC. Multidrug chemotherapy (CT) and brain RT were used in both protocols. Nonresponders to CT were removed from the study. Our main findings are as follows: (1) Initial chest relapses (patients with no initial extrathoracic relapse) have increased from 24-55% when RC is not given (P = 0.0001). Overall chest relapse (adding those patients that relapsed simultaneously in the chest plus other sites) in the second protocol was 73%. (2) Amount of response to CT does not influence the chances for relapse. Even complete responders to CT have a high chance for chest relapse. (3) Sites of relapse without RC are mainly in the primary tumor, ipsilateral hilus and mediastinum. (4) With RC, relapses shift to the chest periphery, mostly to the lung outside the radiotherapy field and to the pleura. (5) The two very different CT regimens have produced similar percentages and duration of response. (6) CT schema with periodic reinductions prolongs duration of response and survival over schema with continuous maintenance. Hence, interruption of CT to allow RC does not seem to adversely influence CT efficacy. From our results and the review of the literature we conclude that: (1) patients with disseminated SCLC that respond to CT should be given RC to decrease chest relapses. (2) A dose of 3000 rad in two weeks seems to be enough to produce a low percentage of chest relapse in disseminated SCLC, as survival of these patients is short and many will die prior to developing chest relapse. However, according to the literature, 4000-4800 rad is probably a more effective dose. (3) More studies and guidelines are needed to outline proper boundaries of radiotherapy fields, to decrease chances of peripheral chest relapses. (4) Median survival might not be a good parameter to evaluate the impact of RC in disseminated SCLC. The study of long-term survivors seems to be more important.

Equivalence of intrathecal chemotherapy and radiotherapy as central nervous system prophylaxis in children with acute lymphatic leukemia: a pediatric oncology group study

The efficacy of intrathecal (i.t.) chemoprophylaxis was compared with cranial radiotherapy plus i.t. methotrexate (MTX) in a Southwest Oncology Group (SWOG) study accessing 408 patients from September 10, 1974, to October 29, 1976. Randomization was stratified by prognostic groups (PGs) based on age and white blood cell count at diagnosis. All received induction therapy with vincristine and prednisone (Pred); maintenance therapy consisted of daily 6-mercaptopurine and weekly MTX. Consolidation for arm 1 employed cyclophosphamide and L-asparaginase followed by biweekly 5-day courses of parenteral MTX. The first dose of each course of MTX was given i.t. in triple chemoprophylaxis (MTX, hydrocortisone, and cytosine arabinoside). During maintenance, i.t. chemoprophylaxis was bimonthly and 28-day Pred "pulses" were given every 3 mo. Arm 2 i.t. chemoprophylaxis was initiated on achievement of remission, and arm 3 i.t. on treatment day 1; both continued 1 yr. Arm 4 induction included two doses of L-asparaginase. On achievement of remission, CNS prophylaxis (radiotherapy, 2400 rad plus i.t. MTX) was given. For all, therapy was discontinued after 3 yr of continuous complete remission. Survival and the incidence of extramedullary relapse were similar for the treatments employing either i.t. chemoprophylaxis or radiotherapy plus i.t. MTX upon achievement of remission. Among poor prognosis patients, the duration of complete remission was significantly better with the regimen using i.t. chemoprophylaxis as a component of consolidation therapy than with the regimen employing i.t. chemoprophylaxis early in induction or with the treatment using radiotherapy plus i.t. MTX for CNS prophylaxis. In poor prognosis patients, the initiation of i.t. chemoprophylaxis during consolidation was also associated with hematologic remissions that were significantly better than those achieved with the treatment employing early CNS chemoprophylaxis or with the regimen using radiotherapy plus i.t. MTX. Among average prognosis patients, therapy with CNS chemoprophylaxis during consolidation, as well as the regimen employing radiotherapy and i.t. MTX for CNS prophylaxis, produced hematologic remissions that were significantly longer than those obtained with the regimen using early CNS chemoprophylaxis. Hematologic remissions of good prognosis patients who received treatment with the regimen employing i.t. chemoprophylaxis during consolidation were statistically superior when compared to the regimen employing CNS radiotherapy plus i.t. MTX. This study indicates that i.t. chemoprophylaxis may be substituted for cranial radiotherapy when utilizing effective systemic regimens. Additionally, chemoprophylaxis may be reduced from 3 to 1 yr in patients with good prognostic factors.

The influence of radiation therapy quality control on survival, response and sites of relapse in oat cell carcinoma of the lung: preliminary report of a Southwest Oncology Group study

Two hundred and ninety-eight patients with limited (confined to chest and supraclavicular area, encompassable by a single radiation portal) small cell carcinoma of the lung were entered on Southwest Oncology Group Protocol 7628. Patients were treated with multi-agent chemotherapy and radiation therapy with or without BCG. Radiation therapy quality control analysis, including dosimetric reconstruction and port film review was introduced after the protocol was activated and was retrospectively applied. Patients who were considered major protocol variations had statistically worse survival (40 weeks versus 60 weeks; P = .002), a lesser improvement in response rate after induction chemotherapy (27 versus 48%; P = .05) and a higher chest failure rate (77 versus 55%; P = .047) than evaluable patients. Five patients relapsed in the brain, all associated with chest failure. Quality control is essential in cooperative group studies.

Anesthesia for tracheal stenosis, tracheoesophageal fistula and status asthmaticus

A 26-year-old female patient who, in addition to tracheal stenosis, also suffered from status asthmaticus and an esophagotracheal fistula, underwent surgery for resection of the stenosed segment, reconstruction of tracheal continuity and fistula repair. The therapy for her asthma and the anesthetic management for bronchoscopy and, later, definitive surgery are described. Radiological photographs (before and after surgery) as well as results of respiratory function tests are shown.

Correction of perfusate concentration for sample removal

Repeated sampling of a drug solution that is recirculated through a perfused body increases the rate of drug disappearance from the perfusate. When the volume of the drug solution (VT) is maintained constant by addition of drug-free perfusate after sampling, the measured drug concentration (Ci) can be corrected for drug removed in previous samples by using the equation C'i = CiVTC'i-1/(VT - VS)Ci-1, where C'i is the corrected drug concentration in the ith sample, VS is the volume of the sample, and C'1 = C1. An error in an particular Ci is not transmitted to a subsequent C'i value. The method can be used when the time interval between samples and when VS vary from sample to sample, but return of the drug from the perfused body to the perfusate after sampling may cause C'i to be overestimated.

Stable isotope analysis by fast-atom bombardment labeling of UDP-glucuronic acid

Fast-atom bombardment mass spectrometry is found to provide a method for analysis of isotopes in the enzyme cofactor uridine-5'-diphosphoglucuronic acid, heretofore unsusceptible to mass-spectral characterization. This technique was used to determine optimal conditions for the introduction of 18O by acid-catalyzed exchange in H218O and to evaluate the loss of the isotope when labeled cofactor is used in enzymatic incubations. Fast-atom bombardment mass spectrometry provided a quantitative assessment of various isotopic species and also permitted the location of the isotopes in the molecule to be determined.

Combination chemotherapy, radiotherapy, and BCG immunotherapy in limited small-cell carcinoma of the lung: a Southwest Oncology Group Study

From November 1976 to March 1979 the Southwest Oncology Group treated 298 patients with limited (disease confined to the chest and encompassed by one radiotherapy port) small-cell carcinoma of the lung with combination chemotherapy and radiotherapy with or without BCG immunotherapy. Two induction chemotherapy programs were utilized: (1) cyclophosphamide, vincristine, methotrexate, fluorouracil; or (2) cyclophosphamide, doxorubicin, and vincristine. Patients received 4500 rads of radiation therapy to the bulk primary tumor and 3000 rads to whole brain followed by maintenance chemotherapy. One-half of all the patients were randomized to receive one vial (5 x 10(8)) of high viability Pasteur BCG by scarification technique given on days 8 and 15 of each 21--28 day treatment cycle. Increased granulocytopenia accompanied the addition of BCG immunotherapy. Patients receiving BCG achieved a response rate of 49% vs. those patients not receiving BCG of 44% (P = 0.579). Median response duration was 40 weeks for the BCG arms and 38 weeks for the arms without BCG; survival was no different, 42 weeks for the BCG arms vs. 50 weeks for the arms without BCG. In patients who responded to therapy and survived longer than one year, those who continued to receive BCG therapy demonstrated a slight, yet significant, survival benefit over those patients not receiving BCG (93 weeks vs. 81 weeks, P = 0.03). It appears that BCG immunotherapy has no beneficial effect on response rate, duration of response, or survival in programs using chemotherapy and radiotherapy for control of limited small-cell carcinoma of the lung except in this small group of long-term survivors.

Limited squamous cell carcinoma of the lung: a Southwest Oncology Group randomized study of radiation with or without doxorubicin chemotherapy and with or without levamisole immunotherapy

In 1976, the Southwest Oncology Group activated a four-arm randomized study of limited squamous cell carcinoma of the lung. The purpose of this study was to determine if doxorubicin and/or levamisole added to radiation therapy improved the local control rate and survival in patients with limited squamous cell carcinoma of the lung. Of the 107 eligible patients, 15 (14%) had complete responses and 20 (19%) had partial responses. When compared by chemotherapy, immunotherapy, and performance status, no statistically significant difference was found in response rates or in survival. Although not statistically significant, the survival and response rates of patients in the combined levamisole arms were shorter than those of patients in the combined arms not containing levamisole. Patients receiving radiation therapy alone had the best survival. The irradiated field was the site of failure in 68 (88%) of the 77 patients in whom the site of failure was specified. Fifty (65%) of the patients failed in the radiation therapy field only. Chemotherapy and/or immunotherapy as employed in this protocol were of no benefit.

Intergroup Hodgkin's disease in children study of stages I and II: a preliminary report

The intergroup study of involved-field (IF) radiotherapy, IF radiotherapy plus MOPP chemotherapy, and extended-field (EF) radiotherapy for treatment of Hodgkin's disease in children has assessed 305 patients. Of these, 279 were "not ineligible" (no mediate cause for disqualification). Among 223 randomized patients, 144 were evaluable, 131 had documentation of complete or partial remission, 20 of the remitters relapsed, and two died. Among 62 nonrandomized patients with favorable presentations (unilateral upper neck, unilateral inguinal, or massive mediastinal disease), 29 had documented remission, two relapsed, and none died. Length of initial disease control (LIDC) was used to measure duration of response. LIDC was best in patients given IF plus MOPP, and 95% are disease free. EF was better than IF radiotherapy (P = 0.004). Of the disease characteristics prognostic for response (stage, histologic subtype, and presence of symptoms), only the last factor had a statistically significant effect on LIDC (P = 0.004). Ninety-six percent of the patients survive. Using criteria developed by the committee, 23% of the staging procedures reviewed were nonevaluable and 28% of the radiotherapy treatments were nonevaluable. The necessity for criteria for evaluation of staging and treatment is certain. Length of followup is too short for correlations of treatment with significant late effects and for relevant therapeutic recommendations.

Phase II study of anguidine in gastrointestinal malignancies: a Southwest Oncology Group study

The Southwest Oncology Group conducted a phase II study of anguidine in 134 patients with gastrointestinal malignancies. Anguidine was administered as a 4-hour infusion at doses of 3.0 and 4.5 mg/m2 daily x 5. Response rates for patients with colon carcinoma were 22% (four of 18 patients without previous chemotherapy) and 6% (four of 63 patients with previous chemotherapy). There were no responses in patients with pancreatic cancer (four patients) or gastric cancer (six). Toxic effects included thrombocytopenia (19.8%), leukopenia (18.8%), nausea and vomiting (49%), hypotension (37%), and confusion (12%). Antitumor activity of anguidine in patients with colon cancer may be similar to that of 5-FU, but nonhematologic toxicity is substantial.

Isolated pleural effusion in small cell lung carcinoma: favorable prognosis. A review of the Southwest Oncology Group experience

The currently accepted staging system for small cell lung cancer considers patients who present with a pleural effusion as having extensive disease, but no series of such patients has been reported. Between 1974 and 1980, 56 patients with ipsilateral pleural effusion as the only evidence of metastatic spread beyond the primary tumor and regional nodes were place on three consecutive Southwest Oncology Group studies of chemotherapy and radiation therapy for small cell lung cancer. Effusions were cytology-positive in 24: response rates and survival were not different whether cytology was positive or negative. The overall response rate was 77 percent, with 36 percent who achieved complete response, a result comparable to that for patients with limited disease. The survival of effusion "only" patients did not differ significantly among the studies. Median survival of 54 weeks and survival curve for the effusion "only" group as a whole was identical to that of all patients classed as having limited disease by the usual criteria. Long-term disease-free survival was observed just as commonly: 2/17 patients from the first study have disease-free survival at greater than five years, and overall disease-free survival at greater than two years is 22 percent. Performance status does not explain the favorable survival in this subgroup, since only 55 percent of effusion patients were fully ambulatory (comparable to extensive disease patients as a group) and even fully ambulatory patients with extensive disease rarely had disease-free survival greater than two years. Patients with ipsilateral pleural effusion as their only evidence of metastasis should be staged as having limited disease.

Adjuvant chemotherapy for medulloblastoma and ependymoma using iv vincristine, intrathecal methotrexate, and intrathecal hydrocortisone: a Southwest Oncology Group Study

In a prospective, randomized, cooperative group trial, the value of iv vincristine and intrathecal methotrexate and hydrocortisone as adjuvant therapy to radiotherapy in children with medulloblastoma and ependymoma was evaluated. The data showed no improvement in the survival of such children when adjuvant therapy was given.

Elevated vitamin levels in colon adenocarcinoma as compared with metastatic liver adenocarcinoma from colon primary and normal adjacent tissue

Twenty-four samples of colon adenocarcinoma removed at surgery and autopsy together with adjacent uninvaded normal colon from the same subjects were analyzed for vitamin B12 and B6, biopterin, nicotinate, riboflavin, pantothenate, thiamin, biotin, and folates. Nine specimens of metastatic liver adenocarcinoma from colon primary together with adjacent uninvaded normal liver were also analyzed for these same vitamins. Primary colon adenocarcinoma contains significantly (P less than 0.001) more of the above vitamins than normal colon; 1.8- to 3.5-fold higher concentrations of vitamins were found in this tumor. In contrast, vitamin B12 levels were almost two-fold lower. Unlike colon tumor, metastatic liver adenocarcinoma from colon primary contained from 1.2- to 28-fold lower vitamin concentration than normal liver tissue. The present findings suggest that those types of primary tumors with conspicuously high vitamin content needed for the enhanced growth and catalysis of tumor metabolism may be arrested with antivitamins targeted at metabolic sites other than those involved with nucleic acid synthesis.

Ethanol and cell replication in the digestive tract

Ethanol-induced injury of the intestines, liver and pancreas evokes a regenerative response which is characterized by a series of morphological and biochemical adaptive responses in subcellular organelles, and an increase in chromosomal protein and DNA replication. Patterns of cell replication vary with the system involved, the amount of injury and the presence of essential precursors or catalysts needed for cell replication. Maintenance of normal cell replacement patterns in the digestive tract of the alcoholic requires correction of deficits and interruption of alcohol intake. An inadequate or excessive regenerative response is of key importance in perpetuating tissue injury in the alcoholic. Regenerative capacity has been evaluated in man by measurement of circulating levels of CEA and alpha-fetoprotein; unfortunately, there is often no correlation between cell replication and these parameters in the malnourished alcoholic. Studies of mitoses or organelle changes in biopsies of intestines and liver are valuable; however, accurate monitoring of regeneration is possible only by kinetic studies utilizing incorporation of tritiated thymidine into DNA.

Use of glycopyrrolate in the parturient: effect on the maternal and fetal heart and uterine activity

The effects of intravenous glycopyrrolate on maternal and fetal heart rate, heart rate variability, and maternal electromechanical intervals and blood pressure were evaluated in 20 term parturients in labor. Direct continuous fetal heart rate and intrauterine pressure were monitored via an intrauterine catheter. Maternal heart rate and R-pulse-wave intervals were measured and maternal blood pressure was recorded at 5-minute intervals. There were no significant changes in fetal heart rate or fetal heart rate variability. The maternal heart rate increased in all cases and the electromechanical interval decreased with the onset of maternal tachycardia. There were no significant changes in maternal blood pressure. Uterine activity increased in all cases; however, this increase does not appear to be greater than that expected in uterine activity as labor progresses.

[Comparison of 99mTc-trend scintigraphy and left ventricular angiography in 33 patients (author's transl)]

In 33 patients (30 male, 3 female, mean age 48 years) 99mTc-Trend Scintigraphy (Schad) was compared with left ventricular angiography. 25 patients suffered of a chronic myocardial infarction. In 26 patients complete or partial agreement between the two methods was seen. The scintigraphy showed false negative results in the apical region and false positive results in the basal segments. The comparison of both methods shows that 99mTc-Trend Scintigraphy can be used to evaluate non-invasively the function of the left ventricle.

Pulmonary manifestations of vinyl and polyvinyl chloride (interstitial lung disease). Newer aspects

Newer varieties of occupational lung diseases primarily due to the vast increase in industrial technology have been reported recently. Preeminent among such newer agents are vinyl chloride (VC) and polyvinyl chloride. Very few cases have been reported, in Europe only, with descriptive histopathologic changes. To our knowledge, no pathologic studies of VC exposure have been described in the American literature. The biopsy abnormalities in our patients disclosed desquamation of alveolar macrophages into the alveolar lumina and minor interstitial and alveolar inflammatory changes. Pulmonary function abnormalities included restrictive insufficiency. Preventive therapy consists of the avoidance of further exposures, frequent industrial hygiene monitoring, and total avoidance of tobacco smoke, as well as associated atmospheric pollutants. Thus far, none of these patients has exhibited evidence of pulmonary neoplasms. All three patients survived their occupational injuries, and two are still disabled to varying degrees. Urine and blood levels of phthalic acid derivatives were elevated in two patients, the exact significance of which is not fully known. It probably represents a toxicologic response, but must be further pursued before conclusions can be reached.

Demonstration of 1,25-dihydroxyvitamin D3 receptors in human skin biopsies

In this study we report the demonstration of receptors for 1,25-(OH)2 vitamin D3 in fresh and cultured human skin. Cultured fibroblasts grown from infant foreskin exhibit a binding site which by Scatchard analysis had a Kd for [3H]1,25-(OH)2D3 of 0.2 nM and an Nmax of approximately 40 fmol/mg cytosol protein. On sucrose density gradients the receptor sediments at 3.2S. Receptors could also be identified in skin biopsies from adult patients when assayed either in fresh epidermis or cultured keratinocytes and dermal fibroblasts. The human receptors are similar to rodent receptors assessed in classical target organs such as intestine, bone and kidney. The findings that receptors can be measured in cultured human skin after several arterial passages indicates that skin biopsy may provide a means of assessing the 1,25-(OH)2D3 receptor status of patients.

[Myocardial scintigraphy (thallium-201) and electrocardiography at rest and during exercise in angina pectoris. A comparison with coronary angiography (author's transl)]

Ecg (at rest and during exercise) was compared to Thallium-201 myocardial perfusion imaging (at rest and after exercise) in 65 patients with coronary heart disease (myocardial infarction in 53 patients) and angina pectoris. These results were compared to coronary angiography and left ventricular angiography. Group I: (48 patients, comparison of Ecg at rest and Thallium-201 imaging at rest): 33 patients showed agreement of results. In comparison to angiography the 201-Thallium imaging showed less false-negative results than the Ecg as rest. Group II: (23 patients, comparison of Ecg during exercise with Thallium-201 imaging after exercise): 8 patients showed agreement, 15 patients did not. In comparison to angiography the imaging showed better agreement in 20 of 23 patients, the exercise Ecg in 14 of 23 patients. Exercise-Ecg showed false-negative results in 7 patients, Thallium-201 imaging in none. Especially in 1-vessel-disease imaging was superior. Group III: (24 patients, comparison of Ecg at rest and during exercise to 201-Thallium at rest and after exercise): In 19 patients results agreed almost. Because of background-correction imaging is inferior to the Ecg in the apical region. Imaging is superior to the Ecg in the septal and inferior-myocardial regions. Combination of both methods gives best correlations. Sensitivity of Ecg-results is 77% and in imaging 93%.

In vitro interaction of L1210 cells with phospholipid vesicles

The in vitro uptake of phospholipid vesicles by mouse leukemia L1210 cells was examined. Liposomes were generated by prolonged ultrasonic dispersion of aqueous dispersions of mixed lipids in the presence of radiolabeled inulin. Multilamellar vesicles were separated from unilamellar vesicles by column chromatography. Vesicle populations were examined by electron microscopy. Neutral vesicles were generated from egg yolk phosphatidylcholine and cholesterol, and surface charge was introduced via either phosphatidylserine or octadecylamine. Uptake, measured as cell-associated radioactivity, was temperature dependent and was strongly decreased by metabolic inhibitors. These results suggested that liposomes are taken up to a major extent by an energy-dependent mechanism. The uptake of liposomes by cells of a young culture was about 2-fold higher than was the uptake of liposomes by cells of a stationary culture. The uptake of positively charged liposomes by cells was about 20-fold higher than that of either neutral or negatively charged vesicles. About one-half of the cell-associated radioactivity transferred by positively charged liposomes could be removed by cell surface treatment with trypsin or neuraminidase or by a short exposure to 0.6 N NaCl.

Alcoholic hyalin antigen (AHAg) and antibody (AHAb) in alcoholic hepatitis

Complement fixation (CF) and immune adherence (IA) hemagglutination tests demonstrate antigen (Ag) and antibody (Ab) to alcoholic hyalin (AH) in serum of patients with alcoholic hepatitis. Immunoglobulins from postmortem liver of patients dying of alcoholic hepatitis show antibody activity against AH. Isolated purified AH was used to produce AHAb in rabbits. Rabbit antiserum was added to heat-inactivated human serum to detect AHAg; purified AH was added to serum and tissue elutes to detect AHAb. AHAg was present in serum of each of 15 patients with early phase alcoholic hepatitis in CF titers of 8 to 64 and IA titers of 16 to 2048. AHAg became negative within 3 to 5 weeks with abstinence from alcohol and was followed by transient appearance of AHAb. AHAb was present in 11 patients with advanced phases of alcoholic hepatitis in CF titers of 8 to 640 and IA titers of 16 to 4096. Four patients in this group exhibited concomitant AHAb and AHAg. Investigations of liver tissue elute reveal that patients with advanced alcoholic hepatitis or active alcoholic cirrhosis have AHAg-reactive immune complexes containing IgG and IgA immunoglobulins.

Lymphocyte proliferation inhibitory factor (PIF) in alcoholic liver disease

Lymphocyte proliferation inhibitory factor (PIF) was determined in the supernatants of PHA-stimulated lymphocytes from patients with alcoholic liver disease. PIF was assayed by determining inhibition of DNA synthesis in WI-38 human lung fibroblasts. A two-fold greater inhibition in thymidine incorporation into DNA by lung fibroblasts was observed in supernatants of PHA stimulated lymphocytes from patients with alcoholic hepatitis or active Laennec's cirrhosis as compared with that found in control subjects or patients with fatty liver. It is suggested that decreased liver cell regeneration seen in some patients with alcoholic hepatitis may be due to increased elaboration of PIF.

Hepatic toxicity in the rhesus monkey treated with chenodeoxycholic acid for 6 months: biochemical and ultrastructural studies

The long term administration of chenodeoxycholic acid in man has to be regarded with caution because chenodeoxycholic acid has caused liver damage in various species of animals, including primates. To study the effect of three doses of chenodeoxycholic acid (10, 40, and 100 mg per kg per day) on hepatic function and morphology, biliary bile acid composition and the reversibility of changes were investigated in 22 rhesus monkeys. After 6 months of treatment with 40 and 100 mg per kg per day, bile duct proliferation, portal tract inflammation and fibrosis, bile canalicular bleb formation, and hypertrophy of the smooth endoplasmic reticulum were associated with elevated serum levels of oxaloacetic transaminase, glutamic pyruvic transaminase, and leucine aminopeptidase. In the bile, the proportion of chenodeoxycholic acid and its bacterial metabolite, lithocholic acid, rose to approximately 85 and 10% of the total bile acids. After chenodeoxycholic acid was withdrawn for 3 months, the hepatic morphological lesions persisted in some animals although biliary bile acid composition returned to normal. No hepatic abnormalities were seen in the animals treated with 10 mg per kg per day. The findings suggest that long term treatment of rhesus monkeys with high doses of chenodeoxycholic acid results in severe hepatic histological lesions that can persist after discontinuation of the bile acid.

Toxicity of chenodeoxycholic acid in the rhesus monkey

Chenodeoxycholic acid is an important drug for the treatment of cholesterol cholelithiasis in man. Although no toxicity has been demostrated in man, liver lesions develop in rhesus monkeys treated with chenodeoxycholic acid. To elucidate the mechanism of toxicity, chenodeoxycholic acid. To elucidate the mechanism of toxicity, chenodeoxycholic acid was fed daily to three groups of 6 animals each at the following dose: 10, 40, and 100 mg per kg; 2 separate animals were not treated and served as controls. After 1 month, the animals were killed. During the treatment period, most blood tests (e.g., blood count, blood urea nitrogen, albumin, SGOT, lactate dehydrogenase) remained within normal limits, but there was a significant dose-related increase in serum leucine aminopeptidase levels. The percentage of lithochlic acid, the 7-dehydroxylated bacterial metabolite of chenodeoxycholic acid, rose from 1% in the control animal to almost 14% in the 100 mg per kg-treated group. Liver biopsies obtained before treatment and at necropsy showed no significant changes. Thus, exposure of the liver to increased amounts of lithocholic acid during chenodeoxycholic acid treatment might result in elevation of serum leucine aminopeptidase activity.