Intracellular melanin polymer (Melanin)

Intracellular melanin polymer is a complex, high-molecular-weight pigment produced by melanocytes and is found in high concentrations within the majority of melanoma cells. While typically sequestered within melanosomes, it serves as a stable and abundant target for therapeutic intervention, particularly because it remains present even in necrotic areas of rapidly growing tumors (Dadachova et al., 2004). Therapeutic strategies leverage melanin's high affinity for specific small molecules, such as benzamides, and monoclonal antibodies to deliver cytotoxic payloads like radionuclides directly to the tumor site. This approach, known as radioimmunotherapy, aims to overcome the cellular heterogeneity of melanoma by targeting a fundamental physical characteristic of the cancer cell (Dadachova & Casadevall, 2008). Additionally, melanin's natural ability to absorb light and convert it into heat is exploited in photothermal therapies to induce localized tumor destruction (PubMed: 18466024).

Other names

EumelaninMelanoma pigmentPolymeric melaninNeuromelanin

Melanin-binding ligands (small molecules or monoclonal antibodies) specifically accumulate within pigmented cells by binding to the melanin polymer. In therapeutic applications, these ligands deliver cytotoxic radionuclides (radioimmunotherapy) or facilitate localized heating (photothermal therapy) to destroy melanoma cells (Dadachova & Casadevall, 2008; Chezal et al., 2008).