histo-, hist-, histi- +

Having an affinity for the tissues.

An enzyme widely distributed in the body that inactivates histamine.

1. An amine (chemical compound containing nitrogen, derived from ammonia) formed from the amino acid histidine (one of the 20 building blocks of protein) by decarboxylation (removal of the carboxyl [univalent radical characteristic of all organic acids] group from a molecule) and produced mainly by the mast cells in connective tissue as a response to injury or allergic reaction.

It causes contraction of smooth muscle, stimulates gastric secretion of hydrochloric acid and pepsin, and dilated blood vessels, which lowers blood pressure and produces inflammation, itching, or allergic symptoms; such as, sneezing.

2. A chemical in the body tissues which is produced by the breakdown of histidine.

It is released in allergic reactions and causes widening of capillaries, decreased blood pressure, increased release of gastric juice, fluid leakage forming itchy skin and hives, and tightening of smooth muscles of the bronchial tube and uterus.

3. An amine released by immune cells that produces allergic reactions.

Any organic derivative of ammonia formed by the replacement of hydrogen with one or more alkyl groups.

A drug that blocks the stimulation of cells by histamine.

This type of agent acts by interfering with the action of histamine rather than by preventing its secretion.

Water-soluble colorless crystals, sometimes called histamine acid phosphate or histamine diphosphate.

It is used most frequently as a diagnostic agent in determining the acid-secreting power of the stomach.

A state of shock caused by an excess of histamine.

1. An essential amino acid found in proteins that is important for the growth and repair of tissue.
2. An amino acid involved in the repair of tissues that is also the precursor of histamine.

A rare inborn error of amino acid metabolism characterized by an elevated level of plasma histidine, excessive urinary excretion of histidine and imidazole (an inhibitor of histamine) metabolites, mental retardation, and defective speech.

The excessive urinary excretion of histidine, a condition which is a feature of histidinemia.

A wandering ameboid cell, capable of ingesting foreign particles, found in the matrix of connective tissue.

Variant spelling of histoid.

An agent capable of irritating tissues, particularly connective tissue.

Of or relating to connective tissue.

1. A reference to the character of blood vessels.
2. Relating to the structure of blood vessels; especially in terms of their functions.

The process or technique of producing autoradiographs from histologic sections of tissue.

An autoradiograph is an image recorded on a photographic film or plate produced by the radiation emitted from a specimen; such as, a section of tissue, that has been treated or injected with a radioactively labeled isotope or which has absorbed or ingested such an isotope. Also called radioautograph.