The total mass, number, and distribution of immune cells in the human body.
Level 5 - mechanism / opinion, no new human data
Quantitative modeling and cross-modal data synthesis (design analogy for non-clinical cell biology estimation)
PubMed 37871201 · doi:10.1073/pnas.2308511120
What was done
The authors integrated data from a literature survey, multiplexed imaging, and methylome-based deconvolution to estimate the abundance, total count, anatomical distribution, and total mass of major immune cell types across all tissues in a reference 73 kg human male.
What was found
A reference 73 kg adult male was estimated to have a total of 1.8 × 10^12 immune cells (95% CI: 1.5–2.3 × 10^12) with a combined mass of 1.2 kg (95% CI: 0.8–1.9 kg). Lymphocytes represent 40% of the total immune cell count and 15% of total mass, concentrated primarily in the lymph nodes and spleen. Neutrophils account for similar proportions of both total number and total mass, residing mainly in the bone marrow. Macrophages account for 10% of immune cell numbers but contribute nearly 50% of total cellular mass due to their large size.
Why it matters
This provides a comprehensive quantitative baseline for the whole-body cellular composition and biomass of the human immune system, facilitating quantitative modeling of human immunology.
Limits
Estimates are derived from computational modeling, literature synthesis, and deconvolution rather than direct whole-body enumeration. The census is standardized to a reference 73 kg male, and the abstract does not report variation by sex, age, body weight, or pathological conditions.
Cited by
- supports The human body contains approximately 10^11 T cells.