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Untitled - D Ank Unlimited

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calcitonin 130 CALLA<br />

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Calcineurin<br />

FK506<br />

FKBP<br />

ς ς<br />

Ca 2+<br />

NF-ATn<br />

NF-ATc<br />

Activated T cells signal via the T cell receptor<br />

to induce the synthesis of NF-ATn and to raise<br />

intracellular Ca 2+ concentration.<br />

CsA<br />

CyP<br />

NF-ATc<br />

For the immunosuppressive drugs<br />

cyclosporin A (CsA) and FK506 to act,<br />

they must first enter the cytoplasm.<br />

Calcitonin⎯medullary carcinoma of the thyroid.<br />

ς ς<br />

Calcineurin is activated by the increased<br />

level of intracellular Ca 2+ . Calcineurin<br />

is a phosphatase that activates NF-ATc.<br />

CsA binds to its target, the intracellular<br />

protein cyclophilin (Cyp) and FK506 binds<br />

to its target, the intracellular protein<br />

FK-binding protein (FKBP).<br />

calcitonin<br />

A hormone that influences calcium ion transport.<br />

Immunoperoxidase staining demonstrates calcitonin in thyroid<br />

parafollicular or C cells. It serves as a marker characteristic<br />

of medullary thyroid carcinoma and APUD (amine<br />

precursor uptake and decarboxylation) neoplasms. Lung<br />

and gastrointestinal tumors may also form calcitonin.<br />

calcivirus immunity<br />

Human calciviruses (HuCVs) have been shown to cause gastric<br />

distress. Antibodies against members of this group such as<br />

small, round, structured viruses (SRSV) that include Norwalk<br />

virus (NV) may crossreact with other viruses of this same<br />

form; thus a rise in antibody titer is insufficient for diagnosis.<br />

Immunoglobulin A (IgA) antibody responses appear more<br />

Calcineurin.<br />

When activated, NF-ATc moves into the nucleus.<br />

It then binds to NF-ATn. The active transcription<br />

factor NF-AT is formed.<br />

Inactive<br />

NF-ATc<br />

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ς ς<br />

Ca 2+<br />

The FK506: FKBP complex or the CsA: CyP<br />

complex binds to calcineurin preventing it from<br />

becoming activated by calcium and blocking the<br />

activation of NF-ATc.<br />

Specific gene<br />

transcription<br />

is activated.<br />

Transcription<br />

is not<br />

activated.<br />

specific. Reinfection by NV is common as preformed antibody<br />

correlates with susceptibility to the illness. Thus, people who<br />

recover often become susceptible again on rechallenge. High<br />

titers attained after several infections are protective in some<br />

studies, although this has not been confirmed. Antibody to<br />

HuCV is protective and mainly type-specific. Vaccines are<br />

available for FCV and RHDV.<br />

CALLA<br />

Common acute lymphoblastic leukemia antigen; also<br />

known as CD10.<br />

Albert Calmette (1863–1933).

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