MFAP3L

MFAP3L Full Name

microfibrillar-associated protein 3-like

MFAP3L Introduction

Microfibrillar-associated protein 3-like (MFAP3L) is a member of the microfibrillar-associated protein family, which are extracellular matrix (ECM) components that associate with microfibrils — filamentous ECM assemblies composed primarily of fibrillin glycoproteins. Encoded by the MFAP3L gene on chromosome 4q32.3, MFAP3L shares structural homology with MFAP3 and is predicted to contain a Kazal-type serine protease inhibitor domain and an immunoglobulin-like domain. The protein is expressed in various tissues and is thought to contribute to ECM architecture and cell-matrix communication, though its precise molecular function remains less comprehensively characterized than some other microfibril-associated proteins.

Figure 1. A functional overview of MFAP3L.

Microfibril Biology and Extracellular Matrix Organization
MFAP3L is an extracellular protein that associates with microfibrillar networks, which provide structural scaffolds for elastic fiber assembly and serve as reservoirs for growth factors including transforming growth factor-β (TGF-β) and bone morphogenetic proteins (BMPs). Through its association with fibrillin-containing microfibrils, MFAP3L may participate in regulating the bioavailability of these sequestered signaling molecules, thereby influencing tissue development and homeostasis. The protein's Kazal domain suggests a potential serine protease inhibitory function, which could modulate ECM remodeling by regulating the activity of extracellular proteases such as elastase, trypsin, or members of the matrix metalloproteinase family. MFAP3L has been detected in cell surface-associated and soluble forms, indicating complex post-translational processing. Its expression is particularly notable in tissues rich in elastic fibers, including the skin, lung, and large blood vessels.

MFAP3L in Cardiovascular Biology, Wound Healing, and Cancer
MFAP3L has been identified as differentially expressed in vascular smooth muscle cells, suggesting a role in arterial wall biology and vascular remodeling. In the context of wound healing, MFAP3L expression is upregulated during the proliferative and remodeling phases, where it may facilitate tissue repair through modulation of ECM assembly and growth factor signaling. In cancer biology, MFAP3L has attracted attention as a potential mediator of tumor-stroma interactions: its expression has been reported to be altered in several cancer types, including colorectal carcinoma and gastric cancer. In colorectal cancer, epigenetic silencing of MFAP3L by promoter hypermethylation has been observed, and reduced MFAP3L expression correlates with advanced tumor stage and poor prognosis. Re-expression of MFAP3L in cancer cell lines suppresses proliferation and invasion, indicating a potential tumor suppressor function mediated through ECM-dependent mechanisms. The relationship between MFAP3L expression and TGF-β bioavailability in the tumor microenvironment is an area of ongoing investigation.

Alternate Names for MFAP3L

MFAP3L; microfibrillar-associated protein 3-like; KIAA0626; NYD sp9; testis development protein NYD-SP9; NYD-sp9;

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