코르티코트로핀

코르티코트로핀 속성

코르티코트로핀 C화학적 특성, 용도, 생산

개요

Natural corticotropin is a 39-amino-acid polypeptide secreted by the anterior pituitary gland; it is obtained from animal pituitaries. The physiological activity resides in the first 24 amino acids (which are common to many species) and most immunological activity lies in the remaining 15 amino acids. The pituitary output of corticotropin responds rapidly to physiological requirements by the familiar negativefeedback homeostatic mechanism. As the t½ of corticotropin is 10 min and the adrenal cortex responds within 2 min, corticosteroid output can adjust rapidly.
Synthetic corticotropins have the advantage of shorter amino acid chains (they lack amino acids 25–39) which are less likely to cause serious allergy, although this does occur. Additionally, they are devoid of animal proteins, which are potent allergens. Tetracosactide (tetracosactrin) consists of the biologically active first 24 amino acids of natural corticotropin (from humans or animals) and so it has similar properties, e.g. t½ 10 min.

용도

Hormone (adrenocorticotropic); glucocorticoid; diagnostic aid (adrenocortical insufficiency) Acthar (Sanofi Aventis); Cortrophin (Organon) [Name previously used: Corticotrophin].

정의

ChEBI: A polypeptide hormone produced and secreted by the pituitary gland comprising 39 amino acid residues coupled in a linear sequence. The N-terminal 24-amino acid segment is identical in all species and contains the adrenocorticotrophic act vity. Corticotropin stimulates the cortex of the adrenal gland and boosts the synthesis of corticosteroids, mainly glucocorticoids but also sex steroids (androgens). It is used in the treatment of certain neurological disorders such as infantile spasms and multiple sclerosis, and diagnostically to investigate adrenocortical insufficiency.

Indications

Corticotropin (ACTH, Acthar, Cortrophin Gel) is an open-chain polypeptide that consists of 39 amino acid residues, the first 24 of which are essential for its biological activity. The remainder of the amino acids are also clinically important, since they may be involved in stimulating antibody formation and causing allergic reactions. This is true especially when corticotropin of animal origin is injected into humans. Commercially available corticotropin is prepared from animal pituitary glands.

생물학적 활성

ACTH is the adrenocorticotropic hormone of the anterior lobe of the pituitary gland, which specifically stimulates the adrenal cortex to secrete cortisone, and hence has effects identical with those of cortisone. ACTH differs in its chemistry, absorption, and metabolism from the other adrenal steroids. Chemically, it is a watersoluble polypeptide having a molecular weight of about 3500. Its complete amino acid sequence has been determined. It produces its peripheral physiological effects by causing discharge of the adrenocortical steroids into the circulation. ACTH has been extracted from pituitary glands. In purified form, ACTH is useful in treating some forms of arthritis, lupus erythematosus, and severe skin disorders. The action of ACTH injections parallels the result of large quantities of naturally formed cortisone if they were released naturally.

Mechanism of action

Corticotropin stimulates the synthesis of corticosteroids (of which the most important is cortisol) and to a lesser extent of androgens, by the cells of the adrenal cortex. It has only a minor (transient) effect on aldosterone production, which proceeds independently; in the absence of corticotropin the cells of the inner cortex atrophy.
The release of natural corticotropin by the pituitary gland is controlled by the hypothalamus through corticotropin releasing hormone (CRH, or corticoliberin), production of which is influenced by environmental stresses as well as by the level of circulating cortisol. High plasma concentration of any adrenal steroid with glucocorticoid effect prevents release of CRH and so of corticotropin, lack of which in turn results in adrenocortical hypofunction. This is why catastrophe may accompany abrupt withdrawal of long-term adrenal steroid therapy with adrenal atrophy.
The effects of corticotropin are those of the steroids (hydrocortisone, androgens) liberated by its action on the adrenal cortex. Prolonged heavy dosage causes the clinical picture of Cushing's syndrome.

Pharmacology

Corticotropin is rapidly inactivated by gastrointestinal proteolytic enzymes and therefore must be administered parenterally. It is rapidly removed from the circulation (T_1/2, 15 minutes) and is probably inactivated in body tissues, since no intact compound is found in the urine.

Clinical Use

Corticotropin is used principally in diagnosis and rarely in treatment. It is inactive if taken orally and has to be injected like other peptide hormones.
Diagnostic use is to test the capacity of the adrenal cortex to produce cortisol. With the short synacthen test, the plasma cortisol concentration is measured before and 30 min and 60 min after an intramuscular injection of 250 micrograms of tetracosactide (Synacthen); a normal response is a rise in plasma cortisol concentration of more than 200 nmol/L or a peak of greater than 500 nmol/L at 30 or 60 min. In cases of uncertainty, the longer variants of the test require intramuscular injection of a depot (sustained-release) formulation, e.g. 1 mg daily for 3 days at 09:00 hours, with a short tetracosactide test performed on day 3.
Therapeutic use is seldom appropriate, as the peptide hormone must be injected. Selective glucocorticoid (without mineralocorticoid) action is not possible, and clinical results are irregular. Corticotropin cannot be relied on to restore adrenal cortisol output when a steroid is being withdrawn after prolonged therapy, as it does not restore function in the suppressed hypothalamic–pituitary part of the HPA axis.

부작용

Aside from hypersensitivity and allergic reactions, corticotropin administration has been associated with electrolyte disturbances and masculinization in women.

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코르티코트로핀 공급 업체

공급자	전화	이메일	국가	제품 수	이점
Henan Tianfu Chemical Co.,Ltd.	+86-0371-55170693 +86-19937530512	info@tianfuchem.com	China	21695	55
career henan chemical co	+86-0371-86658258	sales@coreychem.com	China	29914	58
Chongqing Chemdad Co., Ltd	+86-023-61398051 +8613650506873	sales@chemdad.com	China	39916	58
AFINE CHEMICALS LIMITED	0571-85134551	info@afinechem.com	CHINA	15377	58
Wuhan Fortuna Chemical Co., Ltd	+86-27-59207850 +86-13986145403	info@fortunachem.com	China	5985	58
Baoji Guokang Healthchem co.,ltd	+8615604608665 15604608665	dominicguo@gk-bio.com	CHINA	9427	58
BOC Sciences	+16314854226	inquiry@bocsci.com	United States	19743	58
Chengdu Youngshe Chemical Co., Ltd.	+8618108235634	Cecilia@youngshechem.com	China	2345	58
Henan Bao Enluo International TradeCo.，LTD	+86-17331933971 +86-17331933971	deasea125996@gmail.com	China	2503	58
Shanghai Acmec Biochemical Technology Co., Ltd.	+undefined18621343501	product@acmec-e.com	China	33349	58

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