[A case of an acardius in a triplets pregnancy].
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Abnormalities, Multiple↗
Biomedical subjects
S Matsubayashi
Publications and source records attributed to S Matsubayashi.
Heterogeneity of serum prolactin in patients with menstrual disorder in conjunction with hyperthyroxinemia.
Since the secretion of PRL is regulated by the hypothalamic-pituitary axis, an increase in large molecular size PRL in the serum is most likely due to secretion by the pituitary itself. The present study was performed to investigate the possible occurrence of PRL heterogeneity in 128 subjects with menstrual disorder in conjunction with hyperthyroxinemia (88 with untreated Graves' disease, 40 with subacute thyroiditis) and 50 age- and sex-matched healthy controls. All 128 patients in this study were suffering from amenorrhea or oligomenorrhea at the time of their initial visit. PRL heterogeneity was found in the sera of 5 of 88 (5.7%) patients with untreated Graves' disease, in 2 of 40 (5.0%) patients with subacute thyroiditis, but in none of the normal controls. PRL heterogeneity remained essentially unchanged in patients with Graves' disease over 6 months of treatment; however, in patients with subacute thyroiditis, either big-big PRL or big PRL decreased significantly along with a corresponding increase in little PRL associated with recovery from the illness within 6 months. The menstrual disorders in all patients were restored to normal after restoration to a euthyroid state. The underlying cause of the occurrence of PRL heterogeneity in patients with menstrual disorder in conjunction with hyperthyroxinemia is not known.
Adolescent↗
Interleukin 2-activated killer cells do not mediate autologous thyrocyte lysis in autoimmune thyroid disease in vitro.
Because of interest in IL-2, and IL-2-activated killer cell-induced hypothyroidism in humans, we attempted to study an in vitro system that might prove to illuminate this disorder. We have thus studied interleukin 2 (IL-2--0, 12.5, 25, or 50 U/mL) activated killer cell-mediated autologous thyrocyte lysis, as well as cytotoxic activity in IL-2-stimulated mononuclear cell supernatants in 7 patients with autoimmune thyroid disease (2 Graves' disease and 5 Hashimoto's thyroiditis) using the 51Cr release assay. Controls included 14 patients with nonautoimmune thyroid disease (3 nontoxic goiter, 8 follicular thyroid adenoma, 2 papillary thyroid carcinoma, and 1 medullary carcinoma of the thyroid). Soluble IL-2 receptor (sIL-2R) in supernatants of peripheral mononuclear cells stimulated by IL-2 from these patients also was measured. Whereas in the control preparations, IL-2-activated killer cell activity was increased in a dose-dependent fashion relative to the IL-2 concentration, as well as to the effector cell/target cell ratio, in preparations from patients with autoimmune thyroid disease, this activity was not elevated as the IL-2 concentration was increased. The susceptibility of thyrocytes to the lytic effect of IL-2-activated killer cells was higher in controls than that in autoimmune thyroid disease (at concentrations of IL-2 of 0, 12.5, 25, and 50 U/mL) (p less than 0.01, respectively).(ABSTRACT TRUNCATED AT 250 WORDS)
Adolescent↗
Studies of CD4+ (helper/inducer) T lymphocytes in autoimmune thyroid disease: demonstration of specific induction in response to thyroid peroxidase (TPO) in vitro and its relationship with thyroid status in vivo.
We have studied by flow cytometric analysis the antigen specific activation of CD4+ (helper/inducer) T lymphocytes by purified human thyroid peroxidase (TPO). Peripheral blood mononuclear cells were obtained from 26 patients with Graves' disease (GD), 16 with Hashimoto's thyroiditis (HT), 7 with nontoxic nodular goiter (NG), and 14 normal subjects (N). Cells were cultured for 7 days in the presence or absence of TPO at final concentrations of 3, 30, and 300 ng/mL. When harvested, cells were reacted with an FITC-conjugated anti-CD4 and a PE-conjugated anti-HLA-DR murine monoclonal antibodies. The percentage of HLA-DR+ CD4+ cells (activated CD4+ cells) was determined by a flow cytometer. In the absence of TPO, CD4+ cells had been activated without any specific stimulant. This is known as the autologous mixed lymphocyte reaction (AMLR). In the AMLR, CD4+ cells from GD and HT were less activated compared to those from NG and N. Results of TPO-specific activation were expressed as an incremental increase of activated CD4+ cells (II) (percentage of activated CD4+ cells cultured with TPO minus percentage of activated CD4+ cells cultured without TPO). II of N, GD, HT, and NG were 0.37 +/- 0.21, 2.20 +/- 0.45,** 2.0 +/- 0.66,* and 0.35 +/- 0.27 (mean +/- SEM), respectively (**p less than 0.01; *p less than 0.05 vs N). When patients were further subdivided, the highest mean II was found in patients with hyperthyroid GD (p less than 0.01), followed by euthyroid HT (p less than 0.05) and euthyroid GD (p less than 0.05), however there was no significant difference between hypothyroid HT and N. In conclusion (1) AMLR reactivity of CD4+ cells from GD and HT was impaired, (2) however, CD4+ cells from both GD and HT were significantly more induced by TPO compared to N, and (3) this induction depends, in part, on the in vivo thyroid status.
Adolescent↗
A follow-up study of 85 patients with Graves' disease in remission who developed undetectable serum thyroid-stimulating hormone concentrations using sensitive TSH assays.
Eighty-five patients with Graves' disease in clinical remission after treatment for over 1 year by methimazole therapy (36 patients, group A) or subtotal thyroidectomy (49 patients, group B) who became undetectable for serum thyrotropin levels (TSH less than 0.05 mU/l), were further followed for 1 year or more. Eight patients in group A (22%) and 7 patients in group B (14%) relapsed. Eleven patients in group A (30%) and 5 patients in group B (10%) had fluctuating patterns of free T4 in the upper normal to slightly supranormal range indicative of subclinical hyperthyroidism. The remaining patients continued to have undetectable TSH levels or restored normal TSH levels and normal thyroid hormone concentrations in sera. The results of the present study indicate that the occurrence of undetectable serum TSH concentrations in Graves' disease patients previously treated with methimazole or surgery are not necessarily predictive of clinical relapse because the eventual outcome is variable.
Adult↗
Effects of recombinant human interleukin-2 and tumor necrosis factor-alpha with or without interferon-gamma on human thyroid tissues from patients with Graves' disease and from normal subjects xenografted into nude mice.
We have compared the effects of interleukin-2 (IL-2) or tumor necrosis factor-alpha (TNF alpha) administration with or without interferon-gamma (IFN gamma) on Graves' and normal thyroid tissue xenografts in the nude mouse (in the absence of an intact immune system) in terms of possible functional, immunological, or histological changes. The dosages of recombinant human IL-2, TNF alpha, and IFN gamma given to each mouse were 250, 800, and 4000 U, respectively; they were injected ip daily for 6 consecutive weeks. The parameters measured included the free T4 index, thyroid autoantibodies, and mouse TSH during the course of the study. Thyroid epithelial cell (TEC) HLA-DR expression was measured in thyroid tissue before xenotransplantation and at death; in addition, light microscopic studies were carried out at those times. There were no significant differences in thyroid function between the results in unstimulated (control) animals and those obtained with cytokine administration in either group of tissues, with the exception of the group receiving TNF alpha together with IFN gamma; in this latter group, the free T4 index declined significantly 4-6 weeks after commencement of treatment in the animals with normal thyroid tissue xenografts. The reduction of thyroid function induced by the combination of IFN gamma and TNF alpha observed in normal thyroid tissue may be due to inhibition of thyroperoxidase and thyroglobulin gene transcription. However, there was no such effect on the Graves' thyroid tissue xenografts, perhaps because of down-regulation of this tissue in response to cytokines, after having been released from long term in vivo immune stimulation. On the other hand, TNF alpha plus IFN gamma induced TEC HLA-DR expression on both types of thyroid xenografts at death, although IL-2 alone did not induce HLA-DR expression, and IFN gamma induced TEC significantly only on normal thyroid xenografts (but not on Graves' xenografts). In light microscopic examination, Graves' thyroid xenografts treated with IL-2 alone or TNF alpha plus IFN gamma appeared normal at death. In addition, normal thyroid xenografts treated with the same cytokines did not show discernible differences compared to those at human surgery or when the xenografts were untreated at death. We conclude that Graves' TEC did not differ from normal TEC in any significant fashion at the time of death, aside from a reduced responsiveness to the stimuli applied.(ABSTRACT TRUNCATED AT 250 WORDS)
Animals↗
The incidence of thyroid stimulating blocking antibodies during the hypothyroid phase in patients with subacute thyroiditis.
The etiology of subacute (de Quervain's) thyroiditis (SAT) is uncertain, although it probably represents a nonspecific inflammatory response by the thyroid to a variety of viruses. It has been suggested that nonimmune processes are involved in SAT patients who have negative autoantibody titers. The disease has a variable course; although it is self-limited in most cases, some patients develop transient hypothyroidism, and others do not during the recovery period. The present study was performed to evaluate the occurrence of TSH receptor antibody (TRAb), measured by RRA (TSH binding inhibitor), TRAb measured by stimulation assay (thyroid-stimulating antibody), and TRAb measured by blocking assay [TSH-blocking antibody (TSH-BAb)] activity in 68 patients with SAT who had negative autoantibody titers. The patients were divided into 2 groups: group I, 31 patients who developed hypothyroidism during the recovery period; and group II, 37 patients who remained euthyroid during recovery. Positive immunoglobulin activity occurred in about 20% of group I patients during follow-up, but in only 3% of group II patients. About 20% of group I patients developed positive TSH-BAb activity and were hypothyroid, requiring exogenous hormone therapy for 1.2-3.5 yr, whereas hypothyroidism was relatively transient in group I patients who had negative TSH-BAb activity (2-6 months). Although increased TSH-BAb activity may account for hypothyroidism in some patients with SAT, the precise mechanism for the development of transient hypothyroidism in SAT remains enigmatic.
Adult↗
The effect of xenotransplantation of human thyroid tissue following radioactive iodine-induced thyroid ablation on thyroid function in the nude mouse.
We have attempted to determine whether xenotransplanted human thyroid tissue into nude mice would act as a physiological substitute for the mouse thyroid gland after the mice had been rendered hypothyroid, using radioactive iodine (131I). The dosage of 0.2 millicuries of 131I was given to each mouse. The xenotransplantations of human thyroid tissue, i.e., normal, Graves' and nontoxic multinodular goitre, were carried out three weeks after radioactive ablation. The values of TSH in all mice rose to high levels (71 +/- 15.6 ng/ml, +/- SD) by three weeks after 131I administration. The TSH values in the mice declined rapidly and reached normal levels by 3-5 weeks after xenotransplantation. In addition, the serum T4 values were generally in the euthyroid range by 3-6 weeks after xenotransplantation. There were no marked differences in the changes of serum T4 and TSH when the three groups were compared. These results indicated that the xenografted human thyroid tissue permitted a return to a normal feedback system as reflected by normal serum TSH and T4 values in the animals. The Graves' thyroid tissue reverted to normal physiological function when removed from its human (abnormal) immune environment, signifying that Graves' thyrocytes are mere passive captives to immune events. This model should prove to be useful in the study of human thyroid physiology and pathophysiology.
Animals↗
CD4 cells from patients with autoimmune thyroid disease secrete interferon gamma after stimulation by thyroid microsomal antigen; CD8 cells suppress this secretion.
The production of interferon gamma (IFN gamma) by peripheral blood mononuclear cells (PBMC) from normal persons and patients with autoimmune thyroid disease (AITD) has been studied in vitro either spontaneously or after stimulation with thyroid microsomal antigen (TMc) or liver microsomal antigen (LMc). The numbers of IFN gamma secreting cells were measured by a spot-ELISA technique. AITD PBMC spontaneously contained significantly more IFN gamma secreting cells than did normal control PBMC. Moreover, TMc antigen caused a significantly greater number of IFN gamma secreting cells in AITD PBMC than did LMc antigen, whereas there was no significant difference between the two antigens in the normal control PBMC preparations. Thus TMc antigen caused a stimulation of the number of IFN gamma secreting cells only in the AITD PBMC and not in the normal PBMC. CD4 plus B cells or CD4 cells alone (with monocytes in both instances) contained more IFN gamma secreting cells under unstimulated conditions than did CD8 cells in both groups. AITD CD4 plus B cells (or CD4 cells) contained more IFN gamma secreting cells than did normal cells, but there was no significant difference between both groups in terms of the number of CD8 IFN gamma secreting cells. Normal CD4 plus B cells (or CD4 cells) responded to TMc antigen significantly more than did total normal PBMC at 10 and 1,000 ng/ml TMc. This was not the case when patients' CD4 plus B cells (or CD4 cells) were compared with patients' total PBMC, in which there were no significant differences. This suggests that CD8 suppressor activity was inadequate in AITD and thus the deletion of CD8 cells did not result in an increase in IFN gamma secreting cells. When TMc antigen was added to AITD CD8 cells, there was a significant diminution of IFN gamma secreting cell numbers at 10 and 1,000 ng/ml TMc. Moreover, adding autologous CD8 cells to CD4 plus B cells resulted in a significant suppression of IFN gamma production at 100 and 1,000 ng/ml TMc in both groups. AITD CD8 cells appeared to be somewhat less effective than normal CD8 cells, but this did not reach significance. It is thus concluded that AITD CD4 cells respond specifically to TMc antigen. CD4 production of IFN gamma appears to be suppressed by CD8 cells activated with antigen and the CD8 cells appear to be involved in the regulation of IFN gamma production by the CD4 cells.
Adult↗
Effects of recombinant human interferon gamma on human thyroid tissues from patients with Graves' disease and normal subjects transplanted into nude mice.
We have attempted to determine whether interferon gamma (IFN gamma) would enhance, sustain or induce autoimmune thyroid disease (AITD) in xenotransplanted thyroid tissue from patients with Graves' disease or normal persons (actually paranodular tissue) in nude athymic mice, in the absence of an intact immune system. A dosage of 4000 U/mouse of human IFN gamma (hIFN gamma) was injected intraperitoneally daily for six consecutive weeks into the xenotransplanted mice. The parameters measured included the free T4 index, thyroid autoantibodies and TSH during the course of hIFN gamma injections. Thyroid epithelial cell (TEC) HLA-DR expression was measured in the thyroid tissue before xenotransplantation and at sacrifice; in addition, light and electron microscopic studies were carried out at those times. There were no significant differences in thyroid function between the control results and those obtained with hIFN gamma in either group of tissues. TEC HLA-DR expression was significantly increased by hIFN gamma in the normal group, but insignificantly in the Graves' group. In both light and electron microscopic observations, Graves' tissue (whether or not treated with hIFN gamma) was indistinguishable at sacrifice from normal thyroid tissue. The appearance had markedly altered from the same Graves' tissue examined at the time of the initial human surgery, which then showed the usual histological appearance of this disorder. We conclude that IFN gamma induced HLA-DR expression alone is not sufficient to sustain the ongoing process of AITD in this model.(ABSTRACT TRUNCATED AT 250 WORDS)
Animals↗
Unusual thyroid scintigrams in Plummer's disease during methimazole therapy. Conversion of hot to hypofunctional nodules.
Thyroid scintigrams of two women (aged 48 and 58) with Plummer's disease showed unusual radioiodine accumulation during treatment with methimazole (MMI). Before MMI therapy, the scintigrams revealed most of the radioiodine uptake only in the nodules of the patients and very little uptake in the non-nodular portions of the thyroid. After initiation of MMI therapy, scintigrams performed at three and eight months revealed that the hot nodules had become hypofunctional and that the surrounding tissues had normal radioiodine accumulation. The findings indicate that the nodules in Plummer's disease continue to concentrate MMI selectively compared with normal surrounding thyroid tissue during therapy.
Adenoma↗
Hashimoto's thyroiditis manifesting monoclonal lymphocytic infiltration.
Hashimoto's thyroiditis (HT) and lymphoma are sometimes difficult to distinguish between. Moreover, lymphoma sometimes develops in a thyroid gland from pre-existing HT. Open- or large-needle biopsy usually distinguishes between them; the specimen may be examined histologically and subjected to immunohistochemistry. Another possible method of examination is fine-needle aspiration biopsy (FNAB). The cells obtained may be evaluated cytologically, and subjected to flow cytometry, using various antibodies. In this study, anti-kappa and anti-lambda antibodies are especially important, as a gross predominance of kappa or lambda B lymphocytes infiltrating the thyroid is evidence for a B cell monoclone. In this study, 15 patients were selected because of their rapidly growing goitres. They all underwent FNAB. Five had cytology typical of HT, and no evidence of monoclonality on flow cytometry. They were diagnosed as HT without further histopathology. The remaining 10 patients had cytology suspected of lymphoma, or evidence of monoclonality on flow cytometry, or both. These patients underwent open- or large-needle biopsy. Only three of them were diagnosed histopathologically as lymphoma; the other seven were diagnosed histopathologically as HT, making 12 cases of HT in all. Five of these 12 cases, and one of the three cases of lymphoma showed flow cytometrical evidence of monoclonality; thus evidence of monoclonality from FNAB, while interesting, does not necessarily serve to differentiate between HT and lymphoma. Furthermore, the immunohistochemical assessment of monoclonality did not correlate with the flow cytometrical assessment. Follow-up evidence will be required to discover whether those patients with a B cell monoclone in their HT are the ones who develop a lymphoma.
Aged↗
In vitro production of interferon-gamma by peripheral blood from patients with Graves' disease, Hashimoto's thyroiditis and rheumatoid arthritis.
The production of interferon-gamma (IFN-gamma) by peripheral blood mononuclear cells (PBMC), CD4 cells, or CD8 cells in response to interleukin-2 (IL-2) stimulation has been studied; the samples were obtained from 12 healthy control subjects, 19 patients with Graves' disease (10 hyperthyroid and nine euthyroid), 13 patients with Hashimoto's thyroiditis (four hypothyroid and nine euthyroid), and 15 patients with rheumatoid arthritis (11 active and four inactive). A dose of IL-2 (25 U/ml) was utilized to induce IFN-gamma by PBMC from all four groups. The incremental increase in IFN-gamma values (with IL-2 stimulation minus without stimulation) was significantly less in PBMC from patients with Graves' disease, Hashimoto's thyroiditis, and rheumatoid arthritis than that in PBMC from control subjects. The values from PBMC in patients with Graves' disease in a euthyroid state were below normal but greater than those from patients with Graves' disease in a hyperthyroid state. The incremental increase in IFN-gamma values from Graves' disease PBMC correlated with the serum TSH values (r = 0.622, P less than 0.01), but not with thyroid autoantibodies (anti-thyroid microsomal antibodies, anti-thyroid microsomal antibodies, nor TSH-binding inhibitory immunoglobulin activities). The incremental increase in IFN-gamma from PBMC from both control subjects and Graves' disease was correlated with that from CD4 cells (r = 0.711, P less than 0.01), but not with that from CD8 cells. The production of IFN-gamma in response to IL-2 from PBMC in Graves' disease correlated inversely with thyroid function, appearing to reflect the very effect of hyperthyroidism in this process. The precise explanation of these phenomena remains unclear. The decreased response of IFN-gamma to IL-2 stimulation by PBMC from patients with Graves' disease, Hashimoto's thyroiditis, and rheumatoid arthritis seems to be a non-specific phenomenon occurring in both organ specific autoimmune disease and systemic autoimmune disease. It may be due to a down-regulation in autoimmune disease of CD4 cells in response to IL-2, a decreased level of IL-2 cellular receptors or a decreased receptor affinity, associated increased soluble IL-2 receptors, or a defect of the intra-CD4 cellular IL-2 signal to produce or release IFN-gamma in the conditions studied.
Adult↗
Human pancreatic polypeptide responsiveness to insulin-induced hypoglycemia in anorexia nervosa.
Patients with anorexia nervosa occasionally suffer from hypoglycemic comas. We investigated the role of human pancreatic polypeptide (HPP) in insulin-induced hypoglycemia (0.1 U/kg of regular insulin). Ten female patients with anorexia nervosa (20.7 +/- 2.0 years, mean +/- SEM; 34.9 +/- 1.7 kg, mean +/- SEM) and 8 age-matched female controls (20.9 +/- 0.6 years, 51.5 +/- 0.8 kg) were tested. In the patients with anorexia nervosa, testing was performed before and after the restoration of body weight (45.0 +/- 0.8 kg). There was no significant difference in glucose nadir between patients with anorexia nervosa and the control subjects. However, glucose recovery from nadir was delayed in patients with anorexia nervosa. In anorexia nervosa patients, the plasma pancreatic glucagon responses to insulin-induced hypoglycemia did not differ from those of the controls. Results also showed, however, that HPP responses to insulin-induced hypoglycemia were significantly higher in patients with anorexia nervosa than in controls (p less than 0.01). The increased HPP responses were still present after the restoration of body weight in anorexia nervosa patients. A complete body weight recovery or a longer period of time may be required to normalize the HPP response to insulin-induced hypoglycemia in patients with anorexia nervosa, after the restoration of body weight.
Adolescent↗
Effect of cholinergic muscarinic receptor blockade on human growth hormone (GH)-releasing hormone-(1-44)-induced GH secretion in anorexia nervosa.
The presence of hypothalamic disturbances affecting GH secretion in anorexia nervosa has been suggested, although a normal GH response to GH-releasing hormone (GHRH) administration has been shown in these patients. The present study was performed to investigate the role of acetylcholine in regulating GH secretion by using pirenzepine, which selectively blocks muscarinic cholinergic receptors. Paired tests were performed in nine anorexia nervosa patients (age +/- SEM, 19.1 +/- 1.2 yr; percent ideal body weight, -32.7 +/- 2.2%) and in six normal controls (20.1 +/- 0.3 yr; -3.1 +/- 1.8%). GHRH-(1-44) (1 microgram/kg) was infused iv with and without pirenzepine pretreatment (0.6 mg/kg, iv). Basal levels of GH were not different in anorexia nervosa compared to normal controls, whereas, somatomedin-C levels were significantly lower in anorexia nervosa patients. However, after pirenzepine administration, the GHRH-stimulated GH responses were completely blocked in normal controls, but not in anorexia nervosa patients. These results suggested that altered muscarinic cholinergic mechanism are involved in the modulation of GH secretion in patients with anorexia nervosa.
Acetylcholine↗
Effects of supernatants of peripheral blood mononuclear cells stimulated by thyroid microsomal antigen on thyrocyte HLA-dr expression in vitro.
Supernatants of 5 day cultures of peripheral blood mononuclear cells (PBMC) stimulated by thyroid microsomal antigens (TMA), and liver microsomal antigens (LMA) have been utilized to induce HLA-DR expression on human thyroid epithelial cells (TEC). The PBMC were obtained from 8 normal control persons and 13 patients with autoimmune thyroid disease (AITD) (7 Graves' disease and 6 Hashimoto's thyroiditis). The TEC HLA-DR expression was measured by an enzyme-linked immunosorbent assay (ELISA) technique. TEC HLA-DR expression was calculated as follows: (experimental optical density-control optical density) x 10(3): TEC HLA-DR index: % HLA-DR expression of IFN gamma 100 U/ml stimulation; and stimulation index (SI): TEC HLA-DR expression index induced by PBMC supernatants with antigen stimulation/TEC HLA-DR expression index induced by PBMC supernatants without antigen stimulation x 100. Supernatants without antigen stimulation from both normal control subjects and patients were able to induce TEC HLA-DR expression only minimally: 36.7 +/- 32.6 (mean +/- SD) TEC HLA-DR index for normal controls and 21.3 +/- 15.5 TEC HLA-DR index for AITD (not significant). The SI curves of both TMA and LMA were significantly different between control and AITD using two-way ANOVA test (p less than 0.01). TMA-stimulated PBMC supernatants from the patients increased TEC HLA-DR expression when compared to basal level using paired t-test; TMA 1 ng/ml, SI 179 +/- 99, less than 0.05.(ABSTRACT TRUNCATED AT 250 WORDS)
Adult↗
[Plasma substance P assay and the clinical significance].
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Amylases↗
The clinical efficacy of a 5-HT1A agonist, SM-3997, in the treatment of bulimia.
Psychotherapeutic and pharmacological treatment of bulimia and vomiting require long duration and frequently entail considerable obstacles in patience compliance, making such regimens difficult to pursue. The regulating mechanism of the appetite center is recognized to be complex and recently an important role of serotonin (5-HT), a neurotransmitter, has been shown in rats. In the present study a newly developed 5-HT1A agonist, SM-3997, was administered to 12 patients with bulimia and its clinical efficacy was evaluated. The patients were treated on an open basis with SM-3997, 30-40 mg/day, for 6-15 weeks. Bulimic behavior stopped completely in 4 patients, was improved in 4 others and was unchanged in the remaining 4. These results suggest that the administration of a 5-HT1A agonist, SM-3997, may be effective in the treatment of bulimia and vomiting and that further investigation is warranted.
Administration, Oral↗