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The Functioning of Immune and Hormonal Systems in Patients With Sjogren's Syndrome and in Healthy Volunteers

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00001953
Recruitment Status : Completed
First Posted : January 19, 2000
Last Update Posted : March 4, 2008
Information provided by:
National Institutes of Health Clinical Center (CC)

Brief Summary:

This study aims to learn more about how the immune and hormonal systems function in patients with Sjogren's syndrome, a disease in which the immune system does not function properly. Adult nonpregnant females are invited to participate. Oral contraceptives may not be taken for 6 weeks before and during this study, so another form of birth control must be used, such as abstinence.

There will be two visits. At the first visit, a medical history and physical examination will be conducted, and blood and urine tests will be done. The total amount of blood drawn will be 10 tablespoons. This visit will last 3 hours. At the second visit, participants will have an oral glucose tolerance test. To prepare for it, they must be on a special diet for 3 days beforehand and keep a diary of eating, sleeping, and physical activities for those 3 days. A urine sample will be taken at the beginning of the visit. Subjects must then drink a very sweet carbonated cola. A small plastic tube will be placed into an arm vein. Blood will be drawn through this tube eight times over 3 hours. The total amount of blood drawn will be 17 tablespoons.

Only minor inconveniences are anticipated as a result of participating in this study. Risks from blood tests include soreness, bruising, and minor infection at the puncture site, and dizziness. The oral glucose tolerance test may cause temporary stomach bloating, headache, nausea, and vomiting.

Condition or disease
Sjogren's Syndrome

Detailed Description:
Sjogren's syndrome is a chronic systemic disease that primarily affects the salivary and lacrimal glands and is characterized by lymphocytic tissue infiltration and auto-antibody production. The pathogenesis of Sjogren's syndrome is unknown. We hypothesize that reduced somatostatin activity is an important factor in promoting immune dysregulation in patients affected by Sjogren's syndrome. Somatostatin is a multifunctional peptide with potent immunomodulatory properties whose effects are reduced lymphocytic activity, reduced gastrointestinal secretions, activation of the hypothalamic-pituitary axis, anti-inflammatory, etc. As several findings in Sjogren's syndrome are opposite to those produced by somatostatin, it is logical to consider that the activity of this peptide is low in patients affected by this disease. The purpose of this study is to determine whether basal and stimulated plasma levels of somatostatin and its effects on the immune and endocrine systems differ between 16 patients affected by primary Sjogren's syndrome and 16 healthy control subjects.

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Study Type : Observational
Enrollment : 32 participants
Official Title: Basal and Stimulated Somatostatin Plasma Levels in Patients With Primary Sjogren's Syndrome and in Control Subjects
Study Start Date : November 1999
Study Completion Date : December 2001

Resource links provided by the National Library of Medicine

Information from the National Library of Medicine

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Ages Eligible for Study:   Child, Adult, Older Adult
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   Yes

Female gender only, ages 18 to 75.

Patients should have documented primary Sjogren's syndrome as determined by protocol 84-D-0056. The diagnosis of primary Sjogren's syndrome will be based on the presence of all three of the following:

Salivary gland abnormalities;

Lacrimal gland abnormalities;

Serologic abnormalities.

Controls should have no signs or symptoms of Sjogren's syndrome, and negative serologic testing reconfirmed within 2 weeks of the OGTT.

Willingness to: a) participate in phase I and II of the protocol; b) follow the guidelines set to prepare for the OGTT; and c) modify current medical therapy if necessary.

Must be able to comply with protocol procedures.

No patients with "incomplete" Sjogren's syndrome, i.e., with less than three positive findings as described above.

No presence of physical or mental conditions that may interfere with the protocol. These include the following diseases and conditions:

(Present at time of phase I/II): significant disruption of sleep-wake pattern (i.e., less than 4 hours of continuous sleep, on the night before the OGTT only), BMI less than 18 or equal to/greater than 30, anemia with Hgb less than 10 gm/dl, use of tobacco or alcohol;

(Within the past 6 weeks): acute weight change (greater than 5%), use of contraceptives -BCP-, Depoprovera or Norplant), irregular menstrual cycle, lactation, blood drawing in excess of 50 ml, use of recreational drugs, modification of estrogen replacement therapy;

(Within the past 6 months): chronic pattern of weight change (greater than 10%), eating disorders, uncontrolled hypo/hyperthyroidism, breast cancer, lymphoma or other malignancy, pregnancy, treatment for depression, insulinoma, VIPoma, pheochromocytoma, atrophic gastritis, active tuberculosis or treatment for it;

(A history of): HIV+, sarcoidosis, secondary Sjogren's syndrome, bleeding diathesis, organ transplant, severe neuroendocrine, renal, cardiovascular, pulmonary or gastrointestinal disease (e.g., renal insufficiency, unstable angina, heart failure, severe emphysema, Crohn's disease), diabetes mellitus, acromegaly and mental retardation.

No contraindications to OGTT. These include:

Hospital inpatient status, acute illness, immobilization, starvation, severe emotional distress within one week of the OGTT;

Low carbohydrate diet (less than 150 g/day) for 3 days preceding the OGTT;


Therapy which impairs glucose tolerance: e.g., niacin, thiazide diuretics, phenytoin, excess thyroxine or psychotropic drugs within 1 month of phase I, oral contraceptives within 6 weeks of phase I, glucocorticoid treatment within the past 6 months (or one year if treatment lasted over 2 weeks), Beta blockers/agonists (e.g., terbutaline) within 2 days of phase I;

Diabetes mellitus;

Glucose intolerance.

Subjects may not take medications that can affect somatostatin levels, such as antidepressants, benzodiazepines, neuromodulators (e.g., cholinergic, alpha/beta adrenergic), oral contraceptives (BCP), steroid hormones (with the exception of estrogen replacement therapy -ERT-, for which subjects will be matched), immunomodulators, anticonvulsants (e.g., carbamazepine), cimetidine -Tagamet® (Registered Trademark)-, herbal remedies (because of their variable substance content). Subjects may not take drugs affecting gastrin secretion: antacids (e.g., Maalox® (Registered Trademark), Mylanta® (Registered Trademark), H(2) receptor antagonists (e.g., famotidine -Pepcid® (Registered Trademark)-, ranitidine -Zantac® (Registered Trademark)-), cathecolamines, atropine, haloperidol. To become eligible, subjects should be able to safely discontinue these medications at least one month prior to phase I. Antacids, H(2) antagonists and neuromodulators (e.g., Salagen) may be discontinued 2 days prior to phase I.

Patients cannot have take experimental drugs within 1 month of the beginning of the protocol.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00001953

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United States, Maryland
National Institute of Dental And Craniofacial Research (NIDCR)
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Institute of Dental and Craniofacial Research (NIDCR)

Layout table for additonal information Identifier: NCT00001953     History of Changes
Other Study ID Numbers: 000022
First Posted: January 19, 2000    Key Record Dates
Last Update Posted: March 4, 2008
Last Verified: December 2001

Keywords provided by National Institutes of Health Clinical Center (CC):
Endocrine System
Salivary Glands
Glucose Tolerance Test
Growth Hormone
Sjogren's Syndrome

Additional relevant MeSH terms:
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Sjogren's Syndrome
Dry Eye Syndromes
Pathologic Processes
Arthritis, Rheumatoid
Joint Diseases
Musculoskeletal Diseases
Rheumatic Diseases
Salivary Gland Diseases
Mouth Diseases
Stomatognathic Diseases
Lacrimal Apparatus Diseases
Eye Diseases
Connective Tissue Diseases
Autoimmune Diseases
Immune System Diseases
Hormones, Hormone Substitutes, and Hormone Antagonists
Physiological Effects of Drugs