Human serum albumin

Last updated
blood albumin
ChimeraX rendering of HSA (PDB 1AO6).png
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases ALB , ANALBA, FDAH, PRO0883, PRO0903, PRO1341, albumin, HSA, FDAHT, serum albumin
External IDs OMIM: 103600 MGI: 87991 HomoloGene: 405 GeneCards: ALB
Orthologs
SpeciesHumanMouse
Entrez

213

11657

Ensembl

ENSG00000163631

ENSMUSG00000029368

UniProt

P02768

P07724

RefSeq (mRNA)

NM_000477

NM_009654

RefSeq (protein)

NP_000468

NP_033784

Location (UCSC) Chr 4: 73.4 – 73.42 Mb Chr 5: 90.61 – 90.62 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

Human serum albumin is the serum albumin found in human blood. It is the most abundant protein in human blood plasma; it constitutes about half of serum protein. It is produced in the liver. It is soluble in water, and it is monomeric.[ citation needed ]

Albumin transports hormones, fatty acids, and other compounds, buffers pH, and maintains oncotic pressure, among other functions.

Albumin is synthesized in the liver as preproalbumin, which has an N-terminal peptide that is removed before the nascent protein is released from the rough endoplasmic reticulum. The product, proalbumin, is in turn cleaved in the Golgi apparatus to produce the secreted albumin.

The reference range for albumin concentrations in serum is approximately 35–50 g/L (3.5–5.0 g/dL). [5] It has a serum half-life of approximately 21 days. [6] It has a molecular mass of 66.5 kDa.

The gene for albumin is located on chromosome 4 in locus 4q13.3 and mutations in this gene can result in anomalous proteins. The human albumin gene is 16,961 nucleotides long from the putative 'cap' site to the first poly(A) addition site. It is split into 15 exons that are symmetrically placed within the 3 domains thought to have arisen by triplication of a single primordial domain.

Human serum albumin (HSA) is a highly water-soluble globular monomeric plasma protein with a relative molecular weight of 67 KDa, consisting of 585 amino acid residues, one sulfhydryl group and 17 disulfide bridges. Among nanoparticulate carriers, HSA nanoparticles have long been the center of attention in the pharmaceutical industry due to their ability to bind to various drug molecules, great stability during storage and in vivo usage, no toxicity and antigenicity, biodegradability, reproducibility, scale up of the production process and a better control over release properties. In addition, significant amounts of drug can be incorporated into the particle matrix because of the large number of drug binding sites on the albumin molecule. [7]

Function

Measurement

Serum albumin is commonly measured by recording the change in absorbance upon binding to a dye such as bromocresol green or bromocresol purple. [9]

Reference ranges

The normal range of human serum albumin in adults (> 3 y.o.) is 3.5–5.0  g/dL (35–50 g/L). For children less than three years of age, the normal range is broader, 2.9–5.5 g/dL. [10]

Low albumin (hypoalbuminemia) may be caused by liver disease, nephrotic syndrome, burns, protein-losing enteropathy, malabsorption, malnutrition, late pregnancy, artefact, genetic variations and malignancy.[ citation needed ]

High albumin (hyperalbuminemia) is almost always caused by dehydration. In some cases of retinol (Vitamin A) deficiency, the albumin level can be elevated to high-normal values (e.g., 4.9 g/dL) because retinol causes cells to swell with water. (This is also the reason too much Vitamin A is toxic.) [11] This swelling also likely occurs during treatment with 13-cis retinoic acid (isotretinoin), a pharmaceutical for treating severe acne, amongst other conditions. In lab experiments it has been shown that all-trans retinoic acid down regulates human albumin production. [12]

Pathology

Hypoalbuminemia

Hypoalbuminemia means low blood albumin levels. [13] This can be caused by:

In clinical medicine, hypoalbuminemia significantly correlates with a higher mortality rates in several conditions such as heart failure, post-surgery, COVID-19. [16] [17] [18]

Hyperalbuminemia

Hyperalbuminemia is an increased concentration of albumin in the blood. [19] Typically, this condition is due to dehydration. [19] Hyperalbuminemia has also been associated with high protein diets. [20]

Medical use

Human albumin solution (HSA) is available for medical use, usually at concentrations of 5–25%.

Human albumin is often used to replace lost fluid and help restore blood volume in trauma, burns and surgery patients. There is no strong medical evidence that albumin administration (compared to saline) saves lives for people who have hypovolaemia or for those who are critically ill due to burns or hypoalbuminaemia. [21] It is also not known if there are people who are critically ill that may benefit from albumin. [21] Therefore, the Cochrane Collaboration recommends that it should not be used, except in clinical trials. [21] [22]

In acoustic droplet vaporization (ADV), albumin is sometimes used as a surfactant. ADV has been proposed as a cancer treatment by means of occlusion therapy. [23]

Human serum albumin may be used to potentially reverse drug/chemical toxicity by binding to free drug/agent. [24]

Human albumin may also be used in treatment of decompensated cirrhosis. [25]

Human serum albumin has been used as a component of a frailty index. [15]

Glycation

It has been known for a long time that human blood proteins like hemoglobin [26] and serum albumin [27] [28] may undergo a slow non-enzymatic glycation, mainly by formation of a Schiff base between ε-amino groups of lysine (and sometimes arginine) residues and glucose molecules in blood (Maillard reaction). This reaction can be inhibited in the presence of antioxidant agents. [29] Although this reaction may happen normally, [27] elevated glycoalbumin is observed in diabetes mellitus. [28]

Glycation has the potential to alter the biological structure and function of the serum albumin protein. [30] [31] [32] [33]

Moreover, the glycation can result in the formation of Advanced Glycation End-Products (AGE), which result in abnormal biological effects. Accumulation of AGEs leads to tissue damage via alteration of the structures and functions of tissue proteins, stimulation of cellular responses, through receptors specific for AGE-proteins, and generation of reactive oxygen intermediates. AGEs also react with DNA, thus causing mutations and DNA transposition. Thermal processing of proteins and carbohydrates brings major changes in allergenicity. AGEs are antigenic and represent many of the important neoantigens found in cooked or stored foods. [34] They also interfere with the normal product of nitric oxide in cells. [35]

Although there are several lysine and arginine residues in the serum albumin structure, very few of them can take part in the glycation reaction. [28] [36]

Oxidation

The albumin is the predominant protein in most body fluids, its Cys34 represents the largest fraction of free thiols within body. The albumin Cys34 thiol exists in both reduced and oxidized forms. [37] In plasma of healthy young adults, 70–80% of total HSA contains the free sulfhydryl group of Cys34 in a reduced form or mercaptoalbumin (HSA-SH). [38] However, in pathological states characterized by oxidative stress and during the aging process, the oxidized form, or non-mercaptoalbumin (HNA), could predominate. [39] The albumin thiol reacts with radical hydroxyl (.OH), hydrogen peroxide (H2O2) and the reactive nitrogen species as peroxynitrite (ONOO.), and have been shown to oxidize Cys34 to sulfenic acid derivate (HSA-SOH), it can be recycled to mercapto-albumin; however at high concentrations of reactive species leads to the irreversible oxidation to sulfinic (HSA-SO2H) or sulfonic acid (HSA-SO3H) affecting its structure. [40] Presence of reactive oxygen species (ROS), can induce irreversible structural damage and alter protein activities.[ citation needed ]

Loss via kidneys

In the healthy kidney, albumin's size and negative electric charge exclude it from excretion in the glomerulus. This is not always the case, as in some diseases including diabetic nephropathy, which can sometimes be a complication of uncontrolled or of longer term diabetes in which proteins can cross the glomerulus. The lost albumin can be detected by a simple urine test. [41] Depending on the amount of albumin lost, a patient may have normal renal function, microalbuminuria, or albuminuria.

Interactions

Human serum albumin has been shown to interact with FCGRT. [42]

It might also interact with a yet-unidentified albondin (gp60), a certain pair of gp18/gp30, and some other proteins like osteonectin, hnRNPs, calreticulin, cubilin, and megalin. [43]

See also

Related Research Articles

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References

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  2. 1 2 3 GRCm38: Ensembl release 89: ENSMUSG00000029368 - Ensembl, May 2017
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  34. ↑ Kańska U, Boratyński J (2002). "Thermal glycation of proteins by D-glucose and D-fructose". Archivum Immunologiae et Therapiae Experimentalis. 50 (1): 61–66. PMID   11916310.
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  36. ↑ Garlick RL, Mazer JS (May 1983). "The principal site of nonenzymatic glycosylation of human serum albumin in vivo". The Journal of Biological Chemistry. 258 (10): 6142–6146. doi: 10.1016/S0021-9258(18)32384-6 . PMID   6853480.
  37. ↑ Kawakami A, Kubota K, Yamada N, Tagami U, Takehana K, Sonaka I, et al. (July 2006). "Identification and characterization of oxidized human serum albumin. A slight structural change impairs its ligand-binding and antioxidant functions". The FEBS Journal. 273 (14): 3346–3357. doi: 10.1111/j.1742-4658.2006.05341.x . PMID   16857017. S2CID   12844381.
  38. ↑ Turell L, Carballal S, Botti H, Radi R, Alvarez B (April 2009). "Oxidation of the albumin thiol to sulfenic acid and its implications in the intravascular compartment". Brazilian Journal of Medical and Biological Research = Revista Brasileira de Pesquisas Medicas e Biologicas. 42 (4): 305–311. doi: 10.1590/s0100-879x2009000400001 . PMID   19330257.
  39. ↑ Rosas-Díaz M, Camarillo-Cadena M, Hernández-Arana A, Ramón-Gallegos E, Medina-Navarro R (June 2015). "Antioxidant capacity and structural changes of human serum albumin from patients in advanced stages of diabetic nephropathy and the effect of the dialysis". Molecular and Cellular Biochemistry. 404 (1–2): 193–201. doi:10.1007/s11010-015-2378-2. PMID   25758354. S2CID   6718332.
  40. ↑ Matsuyama Y, Terawaki H, Terada T, Era S (August 2009). "Albumin thiol oxidation and serum protein carbonyl formation are progressively enhanced with advancing stages of chronic kidney disease". Clinical and Experimental Nephrology. 13 (4): 308–315. doi:10.1007/s10157-009-0161-y. PMID   19363646. S2CID   20886185.
  41. ↑ "Microalbumin Urine Test". WebMD.
  42. ↑ Chaudhury C, Mehnaz S, Robinson JM, Hayton WL, Pearl DK, Roopenian DC, Anderson CL (February 2003). "The major histocompatibility complex-related Fc receptor for IgG (FcRn) binds albumin and prolongs its lifespan". The Journal of Experimental Medicine. 197 (3): 315–322. doi:10.1084/jem.20021829. PMC   2193842 . PMID   12566415.
  43. ↑ Merlot AM, Kalinowski DS, Richardson DR (2014). "Unraveling the mysteries of serum albumin-more than just a serum protein". Frontiers in Physiology. 5: 299. doi: 10.3389/fphys.2014.00299 . PMC   4129365 . PMID   25161624.

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