血浆中主要的铁转运蛋白，可结合两个三价铁离子，将铁从吸收位点转运至全身各组织。
蛋白生物学功能
转铁蛋白是多功能单体糖蛋白，主要在肝脏合成，大量存在于血浆中，在铁代谢与铁稳态中起到核心作用。每个转铁蛋白分子可高亲和力可逆结合 2 个三价铁离子（Fe³⁺），实现铁的安全转运与可控分配：将肠道及巨噬细胞来源的铁输送至全身组织，尤其输送至骨髓用于血红蛋白合成。该铁转运过程由细胞表面的转铁蛋白受体介导，通过受体介导内吞作用实现细胞精准摄铁。除铁转运功能外，转铁蛋白可螯合游离铁，具备显著抗菌活性，减少细菌、真菌可利用的铁，参与固有免疫防御，发挥抑菌、抑真菌作用。
常见研究用途
全铁转铁蛋白（Holo-Transferrin）广泛应用于铁代谢与铁转运相关的临床及生物医学研究。转铁蛋白含量变化与多种生理、病理状态相关：缺铁性贫血与妊娠期通常出现转铁蛋白升高；炎症性疾病、肾病综合征、低蛋白血症可导致其水平下降。无转铁蛋白血症等罕见遗传病，会因转铁蛋白功能缺陷引发重度贫血与组织铁异常蓄积。 在诊断与生物技术领域，转铁蛋白是评估铁状态及代谢疾病的重要生物标志物；也常添加至细胞培养基，维持细胞良好生长与活性。转铁蛋白 - 转铁蛋白受体通路是靶向药物递送的热门研究方向，包括利用该通路实现药物跨血脑屏障递送。
常见应用：体外诊断（IVD）检测标准品、校准品与质控品；铁代谢与铁转运研究；受体介导的药物递送研究。
The primary plasma iron transporter, bound to two ferric ions, which facilitates the distribution of iron from absorption sites to tissues throughout the body.
Role of protein in biology
Transferrin is a multifunctional monomeric glycoprotein primarily synthesized in the liver and found abundantly in plasma, where it plays a central role in iron metabolism and homeostasis. Each transferrin molecule can reversibly bind two ferric (Fe³⁺) ions with high affinity, facilitating the safe transport and regulated distribution of iron from absorption sites in the gut and macrophages to tissues throughout the body, especially to the bone marrow for hemoglobin synthesis. This iron delivery is mediated through transferrin receptors on cell surfaces, enabling receptor-mediated endocytosis and precise cellular iron uptake.
Beyond iron transport, transferrin possesses significant antimicrobial properties by sequestering free iron, thereby limiting its availability to bacteria and fungi-a process that contributes to innate immune defense and exhibits bacteriostatic and fungistatic effects.
Common research uses
Holo-Transferrin is widely used in clinical and biomedical research related to iron metabolism and transport. Altered transferrin levels are associated with several physiological and pathological conditions. Elevated levels are commonly observed in iron-deficiency anemia and pregnancy, while decreased levels may occur in inflammatory diseases, nephrotic syndrome, and hypoproteinemia. Rare genetic disorders such as atransferrinemia result in severe anemia and abnormal tissue iron accumulation due to impaired transferrin function.
In diagnostic and biotechnology applications, transferrin serves as an important biomarker for evaluating iron status and metabolic disorders and is frequently incorporated into cell culture media to support optimal cell growth and viability. The transferrin–transferrin receptor pathway is also actively studied for targeted drug delivery, including strategies designed to transport therapeutics across the blood–brain barrier.
Common uses include: IVD assay standards, calibrators, and controls; Iron metabolism and transport studies and Receptor-mediated drug delivery research.
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