Сравнение
Afamelanotide vs. Vasopressin
Два пептида рядом — идентичность, доказательная база, правовой статус и известные нежелательные явления.
Идентичность
Категория
Исследования (прочее)
Исследования (прочее)
Номер CAS
75921-69-6
нет данных
Молекулярная масса
1646.87 g/mol
1084.23 g/mol
Период полувыведения
12 h
нет данных
Последовательность
Ac-Ser-Tyr-Ser-Nle-Glu-His-D-Phe-Arg-Trp-Gly-Lys-Pro-Val-NH2нет данных
Механизм действия
Afamelanotide
Afamelanotide is a synthetic analogue of α-melanocyte-stimulating hormone. It differs from native α-MSH by two substitutions — norleucine at position 4 and D-phenylalanine at position 7 — which make it metabolically more stable and more potent. As an agonist at the melanocortin-1 receptor (MC1R) on melanocytes, it activates adenylate cyclase, raises cAMP and increases tyrosinase activity via the transcription factor MITF. This shifts pigment synthesis toward eumelanin, which absorbs UV and visible light and has antioxidant properties — the presumed mechanism of photoprotection in EPP.
Vasopressin
Vasopressin binds V1 receptors (vasoconstriction, raising vascular resistance) and V2 receptors (renal water reabsorption via aquaporin channels). This raises blood pressure and acts antidiuretically. Desmopressin is the V2-selective synthetic analog.
Доказательная база
Наивысшая доказательность
РКИ на людях
РКИ на людях
Исследования
4
0
из них на людях
4
0
Зафиксированные эффекты
4
2
Открытые противоречия
1
0
Задокументированные нежелательные явления
4
1
Правовой статус
Полные записи
Frequently asked questions
- What is the difference between Afamelanotide and Vasopressin?
- Afamelanotide is classified as "Исследования (прочее)", while Vasopressin is classified as "Исследования (прочее)". Afamelanotide: Afamelanotide (brand name Scenesse) is a synthetic 13-amino-acid analogue of α-melanocyte-stimulating hormone (α-MSH) and a melanocortin-1 receptor agonist. Unlike most peptides covered here, it is a regularly approved medicine: EMA approval in 2014/2015, FDA approval in 2019, in each case as a subcutaneous implant for the prevention of phototoxicity in adults with erythropoietic protoporphyria (EPP). It promotes eumelanin formation in the skin. Vasopressin: Vasopressin (arginine vasopressin, antidiuretic hormone/ADH) is a cyclic nonapeptide hormone that regulates water balance and vascular tone. As Vasostrict it is approved to raise blood pressure in vasodilatory shock. This page contrasts both neutrally and source-based — with no usage or dosing recommendation.
- Which peptide is better supported by science, Afamelanotide or Vasopressin?
- The highest available evidence level is "РКИ на людях" for Afamelanotide and "РКИ на людях" for Vasopressin. A higher evidence level means more robust data, but says nothing about suitability for an individual. The full body of evidence is on each peptide's own page.
- What is the legal status of Afamelanotide and Vasopressin in Germany and the United States?
- Германия: Afamelanotide — Рецептурный, Vasopressin — Рецептурный. США: Afamelanotide — Рецептурный, Vasopressin — Рецептурный. These are factual summaries with source and review date on the individual pages.