Anti-MMP-1 Rabbit Polyclonal Antibody

Frequently Asked Questions

What molecular weight should I expect for MMP-1 on a Western blot?

MMP-1 migrates as multiple bands corresponding to its activation states. The full-length proenzyme runs at approximately 52-57 kDa, while the catalytically active form, generated after removal of the N-terminal propeptide, appears at approximately 41-45 kDa. You may detect both forms simultaneously depending on your sample type and experimental conditions. Cell lysates often show primarily the zymogen, whereas conditioned media from stimulated cells or tissue extracts exposed to activating proteases will display both pro- and active forms. Glycosylation heterogeneity accounts for the range within each form.

Does this antibody recognize both pro-MMP-1 and active MMP-1?

This polyclonal antibody is raised against a region spanning the catalytic and hemopexin domains, which are retained in both the zymogen and proteolytically activated forms. It should therefore detect both pro-MMP-1 and active MMP-1. If your experiment requires discrimination between activation states, run samples under reducing conditions and distinguish bands by molecular weight. For studies specifically tracking activation, consider pairing this antibody with assays that measure enzymatic activity or use activation-state-specific antibodies if differential detection rather than total MMP-1 quantification is your goal.

What starting dilution should I use for Western blot with this MMP-1 antibody?

We recommend starting at 1:1000 dilution for Western blot, which has been validated in-house with human samples. Optimal dilution depends on MMP-1 expression level in your sample, transfer efficiency, and detection system sensitivity. Fibroblasts stimulated with IL-1β or PMA, and certain tumor cell lines, express MMP-1 at readily detectable levels at 1:1000. For low-expressing samples or serum-free conditioned media, you may need to concentrate samples or use dilutions as high as 1:500. For initial optimization, run a dilution series between 1:500 and 1:2000.

Will this antibody work with rat or mouse samples?

This antibody is validated for human MMP-1 and predicted to cross-react with rat, non-human primate, dog, and pig based on epitope sequence conservation. It is not expected to detect mouse MMP-1. Mice lack a direct MMP-1 orthologue; the functional equivalent is MMP-13 (collagenase-3), which has divergent sequence. If you are working with mouse tissue or cells, you will need an MMP-13-specific antibody. For rat samples, test at the recommended 1:1000 dilution but include a positive control such as stimulated rat fibroblast lysate to confirm reactivity in your hands.

What positive control should I use to validate MMP-1 detection?

Human dermal fibroblasts or HT-1080 fibrosarcoma cells stimulated with phorbol 12-myristate 13-acetate (PMA, 10-50 ng/ml, 24-48 hours) serve as robust positive controls, as both cell types upregulate and secrete MMP-1. Collect conditioned serum-free media or prepare whole-cell lysates. Recombinant human pro-MMP-1 or active MMP-1 protein provides an alternative, allowing you to confirm antibody specificity and estimate detection sensitivity. Unstimulated fibroblasts or non-collagenase-expressing cell lines such as HEK293 work as negative controls, though low basal MMP-1 may still be detectable.

Can I use this antibody for immunohistochemistry on formalin-fixed paraffin-embedded tissue?

Triple Point Biologics antibodies are validated for Western blot; IHC application data is in progress. This MMP-1 antibody may perform in formalin-fixed paraffin-embedded sections. Antigen retrieval is typically required; citrate buffer (pH 6.0) heat-induced epitope retrieval is a standard starting point for MMP antibodies. MMP-1 is expressed by fibroblasts, keratinocytes, and infiltrating macrophages, often at sites of tissue remodeling, inflammation, or tumor invasion. Expect cytoplasmic and secreted extracellular staining. Optimize dilution empirically, starting around 1:100 to 1:200, as IHC generally requires higher antibody concentrations than Western blot.

How should I store this antibody and what is the expected shelf life?

Store the antibody at -20°C in small aliquots to avoid repeated freeze-thaw cycles, which can reduce titre and increase aggregation. Once thawed, an aliquot can be held at 4°C for up to one month for convenient daily use. Do not store diluted antibody in blocking buffer for extended periods. Lyophilized or glycerol-stabilized formulations have multi-year shelf life at -20°C; refer to the datasheet for your specific lot. If you observe increased background or loss of signal over time, discard the working aliquot and thaw a fresh one.

Should I expect to see multiple bands on Western blot, and how do I interpret them?

Yes, multiple bands are common with MMP-1. The proenzyme migrates at 52-57 kDa, and the active form at 41-45 kDa after propeptide cleavage. Depending on sample source, you may also detect intermediate processing forms or complexes with tissue inhibitors of metalloproteinases (TIMPs), which shift mobility. If you see higher-molecular-weight bands, consider that MMP-1 can form dimers or bind TIMP-1. Running samples under reducing conditions and including a deglycosylation step with PNGase F can help resolve ambiguous bands. Recombinant standards run in parallel lanes simplify interpretation.