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Exocrine Glands: definition

Glands of the skin or mucous membranes that secrete the substances they produce into ducts leading to a target body surface and ultimately to the outside of the body. Examples are sweat glands in the… 

Vitamin B12 Deficiency

Clams Are Chock Full of Vitamin B12.
Lovely Clams For Vitamin B12.

What Is Vitamin B12?

Vitamin B12, also called cobalamin, is a highly complex vitamin that functions in two coenzyme forms: adenosylcobalamin and methylcobalamin.

These forms of the vitamin play important roles in the physical and chemical processes by which amino acids become proprionate, proprionate that becomes acetate,  and single carbons.

Q: Why are these steps important?

A: These steps are essential for normal function in the workings of all cells, especially for those of the digestive tract, bone marrow and nervous tissue.

Vitamin B12 is mainly excreted through bile into the duodenum (first part of the small intestine) for excretion in stool.1 However, if vitamin B12 is needed, it is reabsorbed in the ileum (end of the small intestine) while excess is excreted in stool and very little in urine.2

The blood level of vitamin B12 in healthy people ranges between 140 and 750 pg/ml.

What Is Vitamin B12 Deficiency In Celiac Disease and/or Gluten Sensitivity?

Sources:
  1. Shibata K, Hirose J, Fukuwatari T. Relationship Between Urinary Concentrations of Nine Water-soluble Vitamins and their Vitamin Intakes in Japanese Adult Males. Nutr Metab Insights. 2014 Aug 5;7:61-75. doi: 10.4137/NMI.S17245. [↩]
  2. Shinton N K. Vitamin B 12 and folate metabolism. Br Med J. Feb 26, 1972; 1(5799): 556–559. [↩]

Muscle Weakness 

Microscopic View of Gastric Biopsy Showing a Collagen Band Under the Surface Mucosal Cells. Courtesy Gastrolab.com
Microscopic View of Gastric Biopsy Showing a Collagen Band Stained Pink Under the Surface Mucosal Cells. Courtesy Gastrolab.com

What Is Collagenous Gastritis?

C ollagenous gastritis is a rarely reported stomach disorder characterized by the deposition of a subepithelial collagen band and accompanying inflammatory infiltrate in the stomach wall.

A subepithelial collagen band means that collagen, a tough fibrous protein, has abnormally accumulated under the surface layer of epithelial cells which form the mucosa lining the stomach.

The surface mucosa may remain intact and not show lymphocytosis and/or gastritis on endoscopic examination or it may become stripped off and bleed from entrapped capillaries. Biopsy is necessary to diagnose collagenous gastritis.1

Q: Why does collagen become deposited under the surface lining of the stomach?

A: It is thought that collagen deposition is preceded by inflammation and tissue damage. However, the natural history and pathogenesis of collagenous gastritis remain unclear.2

What Is Collagenous Gastritis In Celiac Disease and/or Gluten Sensitivity?

Sources:
  1. Jain R, Chetty R. Collagenous gastritis. Int J Surg Pathol. 2010 Dec;18(6):534-6. doi: 10.1177/1066896908329588. Epub 2008 Dec 22. [↩]
  2. Leung ST, Chandan VS, Murray JA, Wu TT. Collagenous gastritis: histopathologic features and association with other gastrointestinal diseases. Am J Surg Pathol. 2009 May;33(5):788-98. doi: 10.1097/PAS.0b013e318196a67f. [↩]

Cataracts

Glucose Meter Reading Showing Hypoglycemia. Courtesy Abbott.
Glucose Meter Reading.Courtesy Abbott.

What Is Diabetic Instability?

D iabetic instability, also called brittle diabetes, is poor control of blood sugar characterized by frequent rise (hyperglycemia) and fall (hypoglycemia). These fluctuations can be life-threatening and cause unnecessary complications.

Q: What are complications in diabetes?

A: Complications of diabetes include any/all of the following:

  • Peripheral neuropathy that causes burning, numbness, or tingling in the extremities.
  • Skin infections and ulcers that do not heal and can lead to amputation of toes, feet or legs.
  • Damage to retina that can progress to blindness.
  • Cataracts and glaucoma that impair vision and can cause blindness.
  • Increased susceptibility to serious infections of the genitourinary tract, lung and upper respiratory tract that can become systemic and life-threatening.
  • Kidney disease that can lead to kidney failure.
  • Heart disease that can lead to heart failure.
  • Vascular disease that can lead to stroke.
  • Impaired motility in digestive tract that can lead to dyspepsia and constipation.
  • Pregnancy complications.
  • Shortened life expectancy.

The main causes of brittleness include malabsorption, certain drugs (alcohol, antipsychotics), defective insulin absorption or degradation, defect of hyperglycemic hormones especially glucocorticoid and glucagon, and above all delayed gastric emptying as a result of autonomic neuropathy.1

What Is Diabetic Instability In Celiac Disease and/or Gluten Sensitivity?

Sources:
  1. Vantyghem MC, Press M. Management strategies for brittle diabetes. Ann Endocrinol (Paris). 2006 Sep;67(4):287-96. [↩]

Intraepithelial Lymphocytosis In Normal Small Bowel Samples 

esophageal small cell carcinomaWhat Is Esophageal Small Cell Cancer (Carcinoma)?

E sophageal small cell carcinoma is a rare and aggressive malignancy arising in the esophagus with a poor prognosis.

Q: Where does the cancer occur in the esophagus?

A: Esophageal cancer can occur anywhere in the esophagus.

The esophagus is a muscular tube that transports swallowed substances to the stomach. It begins at the cricoid cartilage (Adam’s apple) as a continuation of the pharynx and ends at the lower esophageal sphincter (LES).

The LES is a circular muscle surrounding the junction of the esophagus and stomach. The LES opens to allow swallowed food and liquids to enter the stomach and closes to prevent their travelling back into the esophagus.

Dysphagia (difficulty swallowing) occurs when the inside diameter of the esophagus constricts to less than 14 millimeters. First there is difficulty swallowing solid food then liquids and saliva due to progressive growth of the cancer.

What Is Esophageal Small Cell Carcinoma In Celiac Disease and/or Gluten Sensitivity?

Sarcoidosis

What Is Vitamin B12 Deficiency Anemia? V itamin B12 deficiency anemia is a megaloblastic anemia that is characterized by defective DNA synthesis of red blood cells due to a lack of vitamin B12. Vitamin B12 is… 

Peripheral Neuropathy 

Microscopic Slide of Lymphocytic Colitis. Courtesy Quizlet.com
Microscopic  Slide of Biopsy Sample Showing Lymphocytic Colitis. Courtesy Quizlet.com

What Is Lymphocytic Colitis?

L ymphocytic colitis is a microscopic inflammation of the large intestinal mucosa with infiltration of lymphocytes (IELs)  that is characterized by non-bloody secretory diarrhea.

Secretory diarrhea describes bowel movements that consist of a large volume of liquid stool.

Q: What are IELs?

A: IELs is an abbreviation for intraepithelial lymphocytes, which are white blood cells that infiltrate within epithelial cells or between them. Epithelial cells form the surface mucosa of the large intestine also called the colon.

The histopathological criteria (biopsy) for lymphocytic colitis are a density of at least 20 IELs per 100 surface epithelial cells; chronic inflammatory infiltrate of mononuclear cells in the lamina propria; epithelial damage; and a subepithelial collagen layer of less than 10 µm. The increased collagen band consists basically of collagen type I and III, which are the subtypes produced by repair functions, indicating a reactive origin.1That is, the mucosa is reacting to some irritative substance.

Up to 10% of adults undergoing colonoscopy for investigation of chronic diarrhea and having visibily normal appearing mucosa may have lymphocytic colitis.2

Bile acid malabsorption has been shown to coexist in 60% of patients with lymphocytic colitis.1

Lymphocytic colitis (LC) is categorized as primary or secondary.  Primary LC is a clinical and histopathological disease of unknown cause. Secondary LC may develop as the result of iritating factors acting on the colon such as smoking or many medications.  In one study, the most common drug treatments as a percentage of the study group were corticosteroids (32.1%), proton pump inhibitors (26.0%), antidepressant drugs, specifically selective serotonin reuptake inhibitors (21.4%), angiotensin-converting enzyme inhibitors or angiotensin II receptor antagonists (18.3%), statins (17.6%), thyroid hormones (17.6%), and beta-blockers (16.0%).3

Secondary lymphocytic colitis is associated with several concomitant diseases including celiac disease. This is why lymphocytic changes must be interpreted with caution before considering them as a separate entity of autoimmune origin, instead of secondary reactions to ischemia and toxic stimulants. Efforts must be made to better classify and diagnose patients with real, primary lymphocytic colitis to avoid over-prescription of corticosteroids for treatment.3

What Is Lymphocytic Colitis In Celiac Disease and/or Gluten Sensitivity?

Sources:
  1. Ohlsson B. New insights and challenges in microscopic colitis. Therap Adv Gastroenterol. 2015 Jan;8(1):37-47. doi: 10.1177/1756283X14550134. [↩] [↩]
  2. Abdo AA, Urbanski SJ, Beck PL. Lymphotcytic and collagenous colitis: the emerging entity of microscopic colitis. An update on pathophysiology, diagnosis and management. Canadian Journal of Gastroenterology. Jul 2003;17(7):425-32. [↩]
  3. Roth B, Manjer J, Ohlsson B. Drug Target Insights. 2013 Aug 11;7:19-25. doi: 10.4137/DTI.S12109. [↩] [↩]

Autism and Learning Disabilities

Malignant lymphoma high grade B-cell. Courtesy Wikimedia
Malignant lymphoma high grade B-cell. Courtesy Wikimedia

What Is B-Cell Non-Hodgkin’s Lymphoma?

B cell non-Hodgkin’s lymphoma is a malignant, monoclonal (arising from a single cell) proliferation of lymphocytes that is preceded by lymphadenopathy and characterized by varying, less predictable spread than Hodgkin’s disease.

Lymphadenopathy is enlargement of lymph nodes greater than 1.5 cm caused by activation and increased production of lymphocytes and phagocytes (type of white blood cell that engulfs pathogens during infection) or invasion by a tumor.

Q: How does this type of lymphoma develop?

A: 80% to 85% of non-Hodgkin’s lymphoma arise from B-lymphocytes (B-cells).

What Is B Cell Non-Hodgkin’s Lymphoma In Celiac Disease and/or Gluten Sensitivity?

Koilonychia (Washboard Nails)

Epistaxis1[1]What Is Epistaxis?

E pistaxis, or nosebleed, is a feature of secondary hemostasis (blood clotting) characterized by fragility of a plexus of blood vessels in the antero-inferior septum (just inside nostril) and/or abnormal blood coagulation.

What Is Epistaxis In Celiac Disease and/or Gluten Sensitivity?

Nails, White Spots And White Bands

Cardiomegaly-Heart-frontWhat Is Cardiomegaly?

C ardiomegaly is a non-inflammatory disorder of the myocardium (heart muscle) causing the heart to enlarge.

Q: What happens when the heart enlarges?

A:The heart enlarges because excessive growth of muscle tissue (hypertrophy) thickens the heart walls which in turn reduces the size of the lower chambers (ventricles) and impairs the filling of the heart chambers with blood. In consequence, the heartbeat quickens.

Also, the enlarging heart encroaches on lung space which impairs their ability to expand with inspiration of air.

Cardiomegaly can result in heart failure because of inability to pump sufficient blood for the needs of the body and ventricular arrhythmias (irregular or missed beats) that can stop the heart. An echocardiogram, which is a test that uses sound waves to produce a picture of the heart, is used to detect and diagnose cardiomegaly.

What Is Cardiomegaly In Celiac Disease and/or Gluten Sensitivity?