BoneFDA Approved

PTH (1-34) Analogs

Overview

PTH (1-34) analogs, including teriparatide and abaloparatide, are synthetic peptides corresponding to the 34 N-terminal amino acids of human parathyroid hormone. These agents bind to the PTH1 receptor on osteoblasts and osteocytes, stimulating bone formation through activation of intracellular signaling pathways including cyclic AMP and protein kinase A. Intermittent administration preferentially stimulates osteoblastic bone formation over osteoclastic resorption, increasing bone mass and reducing fracture risk. The anabolic effect distinguishes these agents from antiresorptive therapies such as bisphosphonates.

Key Research Findings

Teriparatide was FDA approved in 2002 based on pivotal trials demonstrating significant reductions in vertebral and non-vertebral fractures in postmenopausal women with osteoporosis. Abaloparatide received FDA approval in 2017 following the ACTIVE trial, which showed superior bone mineral density gains and fracture reduction compared to placebo and teriparatide at certain skeletal sites. Both agents carry a boxed warning regarding osteosarcoma risk based on rodent studies, though no causal relationship has been established in humans.

Route of Administration

Subcutaneous injection

Regulatory Status

FDA Approved

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Related Peptides

Teriparatide (Forteo)

FDA Approved

A recombinant form of the first 34 amino acids of human parathyroid hormone (PTH 1-34). When administered intermittently via daily subcutaneous injection, teriparatide stimulates osteoblastic bone formation more than osteoclastic resorption, producing a net anabolic effect on bone. It activates the PTH1 receptor on osteoblasts, increasing Wnt signaling, osteoblast differentiation, and survival while reducing sclerostin expression.

Abaloparatide (Tymlos)

FDA Approved

A synthetic 34-amino acid peptide analog of parathyroid hormone-related protein (PTHrP 1-34) that selectively activates the RG conformation of the PTH1 receptor. This receptor selectivity produces a more transient signaling response compared to teriparatide, favoring anabolic bone formation with less stimulation of bone resorption and calcium mobilization. Abaloparatide increases bone mineral density at both cortical and trabecular sites.

Calcitonin

FDA Approved

A 32-amino acid peptide hormone naturally produced by parafollicular C-cells of the thyroid gland. Calcitonin inhibits osteoclast-mediated bone resorption by binding to calcitonin receptors on osteoclasts, reducing their activity and number. Salmon calcitonin is approximately 40-50 times more potent than human calcitonin and has a longer half-life, making it the preferred therapeutic form.

Vosoritide (Voxzogo)

FDA Approved

A C-type natriuretic peptide (CNP) analog that acts as an agonist at the natriuretic peptide receptor B (NPR-B) on growth plate chondrocytes. Vosoritide counteracts the constitutively activated FGFR3 signaling that suppresses endochondral ossification in achondroplasia. By stimulating the NPR-B/cGMP/MAPK pathway, it antagonizes the growth-inhibitory FGFR3 signal and restores more normal linear bone growth.