Reactivity | RtSpecies Glossary |
Applications | WB, B/N, CyTOF-ready, Flow |
Clonality | Polyclonal |
Host | Sheep |
Conjugate | Unconjugated |
Concentration | LYOPH |
Immunogen | Mouse myeloma cell line NS0-derived recombinant rat IL‑9 Gln19-Ala144 Accession # NP_001099217 |
Specificity | Detects rat IL-9 in direct ELISAs and Western blots. In direct ELISAs, approximately 30% cross-reactivity with recombinant mouse IL-9 is observed, and approximately 10% cross-reactivity with recombinant human IL-9 is observed. |
Source | N/A |
Isotype | IgG |
Clonality | Polyclonal |
Host | Sheep |
Gene | IL9 |
Purity Statement | Antigen Affinity-purified |
Endotoxin Note | <0.10 EU per 1 μg of the antibody by the LAL method. |
Innovator's Reward | Test in a species/application not listed above to receive a full credit towards a future purchase. |
Dilutions |
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Storage | Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
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Buffer | Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS. |
Preservative | No Preservative |
Concentration | LYOPH |
Reconstitution Instructions | Reconstitute at 0.2 mg/mL in sterile PBS. |
Rat interleukin-9 (IL-9; also T-cell growth factor P40 and MEA) is a 20‑30 kDa secreted glycoprotein that belongs to the IL-7/IL-9 family of hematopoietic cytokines. It is best considered an atypical Th2-type cytokine (1‑4). Rat IL-9 was initially isolated from the 4437A rat thymoma cell line (5). The IL-9 precursor is 144 amino acids (aa) in length and contains an 18 aa signal sequence plus a 126 aa mature segment (5). An extended, 219 aa alternate precursor form is reported in GenBank (Accession # XP_001068265). It shows a 113 aa substitution for the first 38 aa of the standard form. Its significance is unknown. Mature rat IL-9 is 75%, 74% and 58% aa identical to cotton rat, mouse and human IL-9, respectively (6‑9). There is variability in cross-species reactivity. Canine and mouse IL-9 are purportedly active on human cells (9‑11), while human IL-9 is inactive on mouse cells (9). Cells reported to express IL-9 include activated CD4+ T cells and eosinophils (12, 13). The receptor for rat IL-9 is composed of the 62 kDa rat IL-9R alpha chain and the 64 kDa rat common cytokine receptor gamma -chain (5, 14, 15). IL-9 is suggested to play a significant, but likely supporting role in allergy and asthma. Its synthesis is induced upon exposure to allergen (10, 13). Following release, it is known to upregulate IgE production by IL‑4‑stimulated B cells (16). It also stimulates mucin secretion and IL-13 production through a direct action on respiratory epithelium (10, 17). In the bone marrow, it promotes eosinophilia, likely through IL-5 induction (18, 19). And once produced, eosinophils are chemoattracted to the bronchi through the IL-9-induced secretion of eotaxin-1 by airway smooth muscle cells (20).
Secondary Antibodies |
Isotype Controls |
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Gene Symbol | IL9 |
Uniprot |