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  • L3408 - Transforming Growth Factor-β1 Latency Associated Peptide human

L3408 Sigma

Transforming Growth Factor-β1 Latency Associated Peptide human

≥97% (SDS-PAGE), recombinant, expressed in Sf21 cells, lyophilized powder, cell culture tested

Synonym: LAP, TGF-β1



Analysis Note

The biological activity is measured by its ability to inhibit TGF-β1 activity on mouse HT-2 cells.

Physical form

Lyophilized from 0.2 μm filtered phosphate buffered saline containing 1.25 mg bovine serum albumin.


Latency Associated Peptide (LAP) may be used to inhibit transforming growth factor-β 1 activity in various biological systems.

Biochem/physiol Actions

TGF-β1 is produced by many cell types, but is reported to be most concentrated in mammalian platelets, where it is present at approximately four times the level of TGF-β2.

General description

TGF-β is released from degranulating platelets and secreted from nearly all cells in a biologically inactive complex which is unable to bind to cellular receptors and is not recognized by antibodies to TGF-β. The peptide can be activated by acidification, alkalinization, or action of chaotropic agents in vitro. The complex consists of TGF-β associated non-covalently with a protein designated as the latency associated peptide (LAP). TGF-β and LAP represent components of a pro-peptide that is cleaved in a post-golgi compartment prior to secretion. The recombinant human LAP is produced from a DNA sequence corresponding to the 278 amino acid residues of pre-pro-TGF-β1 terminating prior to the mature TGF-β1. LAP contains a Cys33 to Ser33 substitution. LAP contains 249 amino acids, generated after cleavage of a 29 amino acid residue signal peptide. LAP is a glycoslyated, disulfide linked homodimer.

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Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis

Certificate of Origin

Protocols & Articles


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